https://isotoparium.org/home daily 1.0 2021-06-20 https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1631129896449-55LLYLQOL38UNKE1L7A1/Home_v3.jpg Home - We study the smallest differences to tell the largest stories. https://isotoparium.org/facilities daily 0.75 2024-08-26 https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1607133961733-0L4RRM85QRENJVU0WSB5/labmap_clean+lab.jpg Facilities Clean Lab blueprint. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622066825721-YBPY5LPNGHYV3XD5W8KZ/CleanLab_IMG_10426.JPG Facilities - Make it stand out Mo hood (left), cleaning island (center) and Nd hood (right) (unspiked lab). https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622667168950-8CGZG16PKGY8IBS5HSDT/IMG_1437.JPG Facilities - Make it stand out Milli-Q water purification system (unpsiked lab). https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622667295008-7EAQ5F8IAMIBB4V1DJSB/IMG_1452.JPG Facilities - Make it stand out Precision balance (to 10mg, left) and analytical balance (to 0.01 mg), with anti-static U-bar (weighing room). https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622667206656-NOR7NDFOU4V84N4LKV4O/IMG_1444.JPG Facilities - Make it stand out Oven, centrifuge, precision balance and orbital shaker (weighing room). https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622066773994-CX8DO4L4ZZWJ5PVQ88WT/IMG_1436.JPG Facilities - Make it stand out Sub-boiling acid distillation and Teflon leaning (Unpsiked lab). https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622076044360-Z6DN46CRCAC39JTD7MXO/IMG_0949.JPG Facilities - Make it stand out Seawater samples evaporating in preparation for chemistry (spiked lab). https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622667272866-1X8H6Z2O0KEPPNTAJWRD/IMG_1446.JPG Facilities - Make it stand out Micromill (left) and microscope, for precision sampling (weighing room). https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622075911221-47769K24Z5VCASYUPD6P/Angrite_samples_2012_2+copy.JPG Facilities - Make it stand out Angrites meteorites after crushing, ready for digestion. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622667331789-KZXMAVXF1KJTLPO4BK14/IMG_1453.JPG Facilities - Make it stand out Solvent cabinet and clean-lab fridges dedicated to isotopic standards (center) and spikes (right) (weighing room). https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622066795181-P47YF8VWKPKHVIILM3EN/IMG_1463.JPG Facilities - Make it stand out Spiked lab. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622076065290-IE9T8OHWK5G1P7CIUFK7/iRMM524a.png Facilities - Make it stand out iRMM-524a Fe foil in MQ water, ready to be dissolved (left), and actively digesting in 500 ml of 2.5M HNO3 (right). https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622667232754-GAI4WB44L844UU9JP8ZN/IMG_1439.JPG Facilities - Make it stand out Custom-made pressurized 30-cm columns with drop counter for Nd purification (unspiked lab). https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622667380131-134SK4FNUPHY3EF5GODD/IMG_1458.JPG Facilities - Make it stand out Sample pass-through (weighing room to spiked lab). https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1607134186328-ZK9FCYID7DU2UPQMHEJT/2020-11-02_01-04-41.png Facilities https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622668561570-K305WA0ASOXBZKV4SW37/IMG_5896.jpg Facilities - Make it stand out The back end of the Neptune, settling in the Isotoparium. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622668817302-WMJFQF029SAODNK8A6FG/NeptuneInstall_IMG_9305.JPG Facilities - Make it stand out A rare view of the Neptune's analyzer gate (internal component), seen here holding the back-end vacuum. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622668563595-N4KSYALGH9B8XC0TOBJ1/iCapInstall_IMG_9789.JPG Facilities - Make it stand out iCap door opened revealing the plasma interface. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622668738247-56ZV6W3P8NQJ9VZ3RW9D/Laser_IMG_9470.JPG Facilities - Make it stand out Unpacking the NWRfemto laser-head. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622668651531-XL9WEGF6PAOV59MIS3ZH/preview-chat-NeptuneInstall_IMG_9353.JPG Facilities - Make it stand out Neptune Plus MC-ICP-MS (#309), installed! https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622668840287-6HGWYWQR5EIDWECQI20N/TIMS_Cups_IMG_9776.JPG Facilities - Make it stand out Changing the TIMS graphite liner cups. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622674993369-3WOLJJT1FUX3H9BP97QK/preview-chat-iCap_IMG_9787.JPG Facilities - Make it stand out ICP-MS iCAP RQ for concentration work. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622674492646-P1SFD3VZ871LXLYEGES1/Laser_IMG_9487.JPG Facilities - Make it stand out NWRfemto laser beam alignment tests. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622668804783-QSNNA44WUBW3M4RZ0EQQ/NeptuneInstall_IMG_9273.JPG Facilities - Make it stand out The half-ton magnet carefully approaching the Neptune's flight tube. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622674586452-N4O6DZ190UNBJGR3EUBY/preview-lightbox-IMG_3266.jpg Facilities - Make it stand out Dr. Papanastassiou's TIMS (#27) transplant (from JPL), first to move into the Isotoparium. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622668549858-2HUOD7ZSR3F08D3LJ5PW/Laser_IMG_9503.JPG Facilities - Make it stand out NWRfemto Laser: #10 in the world, #2 in the US. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622675257561-VICK0HTS0K518Y2RN98S/IMG_5550.jpg Facilities - Make it stand out The Neptune and iCap components, freshly received at the dock and on their way to the Isotoparium. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622675193634-XWGMHE6JK3OYECC9NRTA/Ducts_IMG_9043.JPG Facilities - Make it stand out Isotoparium's air handling unit (bottom) and giant exhaust fans (top) (roof of North Mudd building). https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622675233665-DYNGGS9XVSQBZPOOUOX7/Ducts_IMG_9057.JPG Facilities - Make it stand out Insider's view of the Isotoparium's fiberglass reinforced plastic exhaust pipes and exhaust fans (roof of North Mudd building). https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622675287779-TYZI3E90C8UJJQ66TV6Y/Crane_IMG_9034.JPG Facilities - Make it stand out Craning the various air handling unit components onto the roof (North Mudd, Caltech). https://isotoparium.org/team daily 0.75 2025-11-20 https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/310d4823-2acb-426b-80d8-f502da76c051/Retreat_2024.jpg Team - Make it stand out Lab retreat (Oct 2024) at Mt. San Jacinto State Park for a weekend of hiking and science talks! https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1632292207597-JBP5A3NTWQUSMKA6EOS6/DSC_2799+copy+2.JPG Team https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/bb072762-d81c-4d49-92bb-adc52bb4b41e/Theo_crop.jpg Team - Make it stand out Théo obtained his PhD from Ecole Normale Supérieure de Lyon (France) in 2017 at the Vincent Balter’s group. He then worked as a Marie Skłodowska-Curie fellow at the University of Bristol (UK), in the group of Prof. Tim Elliott and as a research associate in the group of Prof. Thomas Tütken at the Johannes Gutenberg University (Mainz, Germany). Théo’s research primarily focuses on the use of the nutritional and physio-pathological controls of the cycling of metal stable isotopes in mammals and human to reconstruct the evolutions of dietary practices and track disorders of metal metabolism. Théo joined the Isotoparium at Caltech in 2024 as a postdoctoral researcher where he will research the utility of the stable isotopes of essential metals for biological and clinical applications. In his spare time, he loves photography as well as climbing and hiking. You can contact Théo at ttacail@caltech.edu. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621556486534-FH9T51FABG2P3BFMMYY9/Haoyu.jpg Team Haoyu graduated from Nanjing University of China with a B.S. of Geology. She joined the Isotoparium at Caltech in 2018. She is now working on the chronology of Early Solar System and marine redox history. She likes baking and watching movies. You can contact Haoyu at haoyu.li@caltech.edu. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/6d1de80f-875f-40ba-8094-801ccaa15816/Rebecca_crop.jpg Team - Make it stand out Rebecca obtained her PhD at the University of Wollongong (Australia) in 2025 in the Wollongong Isotope Geochronology Laboratory, where her research primarily focused on the use of novel geochemical techniques (boron isotopes and FTIR spectroscopy) to extend the existing fire history. Rebecca joined the Isotoparium at Caltech in 2025 as a post-doctoral researcher, where she will research the use of essential metals for biological and clinical applications. In her free time, she enjoys photography, hiking and a good book. You can contact Rebecca at rjryan@caltech.edu. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621557268548-12CP7IX0F7IQL3VHCOOD/Shane.jpg Team Shane transferred from Pasadena City College to UCLA where he received a B.S. in Geology in 2020. His goal is to combine isotope geochemistry and field-based investigations to study the origin and evolution of Earth’s crust. In particular, to further develop the use of zircon as a geochronometer and geochemical tracer in addressing outstanding questions regarding Earth’s formative years. At the Isotoparium, he is currently assisting in research on the bonding environment, speciation, and isotope fractionation of uranium in zircon. In addition to his scientific pursuits, Shane is a musician and avid explorer of the outdoors. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/08907c5f-00f0-4c2a-958e-adf8b3bb8b88/Tony_crop.jpg Team - Make it stand out Tony received his B.A. in Astrogeophysics from Colgate University before joining the Isotoparium in 2022. He aims to probe the evolution of the early Solar System (SS) with research at the intersection of Isotope Cosmochemistry and Planetary Astrophysics. At the Isotoparium, Tony is currently using nucleosynthetic isotope anomalies to elucidate genetic ties between SS materials, develop models for early SS formation and evolution, and constrain the nature and origin of Earth’s building blocks. You can contact Tony at tyap@caltech.edu. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/403d18c1-9453-447b-bb9e-8471e90396a1/Hayward_crop.jpg Team - Make it stand out Hayward received his B.S. in Electrical Engineering with a focus on biomedical devices from Caltech and joined the Isotoparium in 2023. As a PhD student in the MedE/EE program, he is working to combine the fields of medical and electrical engineering with isotope metallomics to search for novel disease detection techniques. He enjoys camping, photography, and woodworking among other hobbies. You can contact Hayward at hmelton@caltech.edu. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/eca1d83b-697e-42df-8f12-ecc2e9560b3f/Sophia_crop.jpg Team - Make it stand out Sophia graduated from UCLA with a B.S. in Chemistry and a specialization in Computing before joining the Isotoparium in 2024. Sophia’s interests lie at the intersection of chemistry and planetary science, and she hopes to use isotopic signatures to gain insight into questions at the heart of cosmochemistry and the origin of our Solar System. Outside of the exciting world of isotopes, Sophia enjoys hiking, skiing and reading. You can contact Sophia at swesterk@caltech.edu. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/67440631-ca12-4155-97f0-3f493ac584cf/Merritt_crop.jpg Team - Make it stand out Merritt graduated from New York University with a B.A. in Chemistry and minor in Astronomy in 2023, before joining the Isotoparium in January 2025. She is currently investigating heavy metal distribution and contamination of residential spaces following the 2025 Eaton Fire in Los Angeles, hoping to use elemental and isotopic analysis in the lab to inform revised emergency response and public health decisions on a city- to nationwide scale in the aftermath of destructive urban fires. Outside of the lab, Merritt enjoys playing volleyball on campus, reading outdoors, and attending sports events around LA. You can contact Merritt at mmcdowel@caltech.edu. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/62263eb5-54b3-4865-aa0e-96813b43d532/Debarun_crop.jpg Team - Make it stand out I am a grad student working at the Isotoparium in deciphering the framework of the constituents of our solar system. I am deeply interested in scientific problems ranging from the cosmos to the benthos and collaborate with scientists across continents. I am cultivating a deeper understanding of CI chondrites and exploring the potential of an isotopic trichotomy in the solar system. In my free time I love cooking, hiking, reading and writing poetry. Reach out to me (debarun@caltech.edu) if you want to chat about any of these! https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621558022960-GI2IS0HFRPJDBUOZ46TW/Adkins_ed.jpg Team - Make it stand out Jess Adkins https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621558581670-S4KGJWIC9RUW3AXQV2OV/Bekker.jpg Team - Make it stand out Andrey Bekker https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621558693912-NHGR4P3HCD4ZJWWUG89U/IMG_0360_ed.jpg Team - Make it stand out Christoph Burkhardt https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621558876282-7CJ1XG9VIGRCCV9MBKG4/Davis_ed.jpg Team - Make it stand out Andrew Davis https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621632189839-LA7FC1MEMEOC4EOIUVYQ/Grove_ed.jpg Team - Make it stand out Timothy Grove https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621559065306-0AHQIA0LGSIURZ19N4WT/Mark_Harrison_ed.jpg Team - Make it stand out T. Mark Harrison https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621558721943-73H3IVQ7IPP0NAPEU1QC/Ibanez-Mejia+Portrait_ed.jpg Team - Make it stand out Mauricio Ibañez-Mejia https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621559100025-K7MU8Q8FJ17G84G7YX1A/Kevin-McKeegan_ed.jpg Team - Make it stand out Kevin McKeegan https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621559131907-LIN6ZME6XZ1WSCNLQ1SR/Marc-Millet_ed.jpg Team - Make it stand out Marc-Alban Millet https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621632327462-C95F80H9ZVC2728AWRIE/Pourmand-240x320_ed.jpg Team - Make it stand out Ali Pourmand https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621632527686-V8RHVZ6OE6JM528TDQLF/Olga_ed.jpg Team - Make it stand out Olga Pravdivtseva https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621632724710-THEPAS24XGCOQ44L04VH/ravi-salgia_ed.jpg Team - Make it stand out Ravi Salgia https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621632936992-8GLMYJ9GXTGMJC6Q1Z1H/scott620_ed.jpg Team - Make it stand out Valerie Scott https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621633106163-NOG74RJZ4WMSXI9T1RA2/Tang_ed.jpg Team - Make it stand out Haolan Tang https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621633253737-ZW0NTNWF1XHRKJKN776F/Weiss_bodyshot_2019-04-20_lowres_ed.jpg Team - Make it stand out Benjamin Weiss https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/81c03a18-6dbe-4113-a7bf-494220ce395e/Weiyi.jpeg Team - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621557107457-D7NKWY3USXZDZXGM5B8Q/Emily.jpg Team https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621557132373-FSXV1I8ZWT0QM6IW2NRY/Ren.jpg Team https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/6e309715-f92e-477d-85ce-a2685d04eb0d/Rosa_crop.jpg Team - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/2f0de8dc-8029-4382-9e09-b5f947273cbb/Mike.jpg Team https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/67bcc99e-bc22-4a1d-a099-dec27f88569a/Nie_Nicole_crop.JPG Team - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/b4e00090-44e5-456b-9cfb-943a02da91bb/Roxana_crop.jpg Team - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621557041239-PWA7M5316AXGDN0XWMH9/Gerrit.jpg Team https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1624479840454-DDI42T91V5VVRHVNW5ID/Eugenia.jpg Team https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621556462983-8FG44HE9GYLEOIG2U5JS/zhanna.jpg Team https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621557322458-YIH0Z0PL1E55H5JO5CVK/Elizabeth.jpg Team https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621556955573-3AR95GW3CDNG2FMCMCW7/Frankie.jpg Team https://isotoparium.org/teaching daily 0.75 2021-05-28 https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1607120648974-IP83H2YYDVG1F6IOKIIV/2020-12-04_14-22-55.png Teaching Credit: Patterson (1956) GCA 10, 230-237 https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1607120477270-07AUTSRTNQT5CJH2BPM2/preview-lightbox-284735main_A-DualAsteroidBelts-full.jpg Teaching Credit: NASA/JPL https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1620600592007-JU4M0WS08VBLT995AR44/Screen+Shot+2021-05-09+at+3.49.42+PM.png Teaching https://isotoparium.org/news daily 0.75 2026-02-17 https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/c6b2ab16-9d73-4ad1-9974-36614aa8c735/AltadenaCouncilOfficial.png News - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/2657621f-4168-4f99-94e2-d0ab676c27a4/Figure_1.png News - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/b9de864c-2a84-4dab-afbe-e2587d6d7195/After_the_fires.png News - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/79b5fea1-d801-4e73-b0ec-e6770d53e5c5/Pnas_cover_Morgan.jpeg News - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/56e95294-4e47-4d59-b3f0-5c3051512414/tempImageps6EeN.jpg News - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/fb67ccd0-40d6-442f-b062-62e8e05a7c13/image4.jpeg News - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/b5154a32-b666-4c15-b43b-af5a783483dd/Ren_defense_1.JPG News - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/72c8437a-dee5-49f2-ada5-e5d036aa1ebf/Venus_In_Situ_Final_Report+copy.jpg News - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/5e048912-c8a2-43ed-a81f-56b638fa8dea/Mike_Farewell_IMG_9257.jpeg News - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/f93b6673-dbbf-4095-95c0-10fd9f5a68ff/ISSI+Bern+2023+Group+Photo+Early+Solar+System+Workshop.jpeg News - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/811ff7ee-f17c-4797-b73a-9ea6f2a29169/Nicole_Party_2023.JPG News - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/d2731629-1d1d-4acf-91e7-bb350f1fd258/Screenshot+2022-12-11+at+11.28.10+PM.png News - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/c7208dce-24ff-48b1-85e4-73542fffc0d8/ELEM_Cover_v17n6_LR.png News - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/d81cc3c3-7c9e-4cd7-a7c1-ab3506b366ed/IMG_8376.jpg News - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1617926855239-XGI34Z33906PR9BE9QJS/preview-chat-iCap_IMG_9787.JPG News iCAP RQ ICP-MS https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1617926329725-KVB1VZ9RCAU7CO3J85X6/preview-chat-NeptuneInstall_IMG_9353.JPG News Neptune Plus MC-ICP-MS (#309) https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1617926742184-S9KH7KSAOXJE688T92OO/preview-chat-Laser_IMG_9503.JPG News NWRfemto Laser (#10) https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621011045024-S7RJL5J36RCMOCEGY3O5/preview-lightbox-IMG_3266.jpg News - Make it stand out Triton TIMS (#27) https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1617928394341-2981SLQTOWTTMVLOV1BW/preview-chat-Ducts_IMG_9001.JPG News https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1617928539031-ICV56IGOX4NDTZ5ECLBQ/preview-chat-Ducts_IMG_9070.JPG News https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1617928407068-VMPKYUYUNBA0J0CHLK8U/preview-chat-Ducts_IMG_9043.JPG News https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1617928433585-A6HPTP1PFMPX6V19GGDA/preview-chat-Ducts_IMG_9056.JPG News https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1617928374726-95UJEIXE5QI2O053OLJ1/preview-chat-Crane_IMG_9034.JPG News https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1617926979023-ELWG1195Y4IEAKO5DORN/preview-chat-MassSpec_IMG_8983.JPG News https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1617927967822-1PS1DAOVUKL4XLT3XZ82/preview-chat-CleanLab_IMG_9035.JPG News https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1617927987890-ILYIPS7WMBRTRR42Y3VY/preview-chat-CleanLab_IMG_9360.JPG News https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1617928004688-ZBUFSF5G6Y7OS5619EQQ/preview-chat-CleanLab_IMG_8908.JPG News https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1617927845078-DZ6CMUS79WGELA2SHKBG/preview-chat-Cabinets_IMG_8855.JPG News https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1617927870284-YNKE7D8R4MUJ6ADU8GHC/preview-chat-Cabinets_IMG_8864.JPG News https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1617927766874-9RVK7KH8LGVVPJRSFG7G/preview-chat-CleanLab_IMG_8056.JPG News https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1617927781980-ORKI7JS2WRTNADXTTAZZ/preview-chat-CleanLab_IMG_8057.JPG News https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1617927678473-3NTROS3CAKM2KEFUH13Y/2021-04-08_17-20-39.png News https://isotoparium.org/outreach daily 0.75 2025-06-14 https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/8d36b5e0-0e3b-44c0-b0c6-8069c3dd2c18/Lead_press.png Outreach - Eaton Fire and Heavy Metal Public Debate Our data on lead contamination in the aftermath of the Eaton Fire is playing an important role in the public debate on risks assessment and next actions, being featured and discussed on KABC (Channel 7), KQED (NPR), as well as in the LA Times and on Altadena Council Official. Again, special mention for graduate student Merritt McDowell and postdoc Theo Tacail for completing this critical work so swiftly. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/2657621f-4168-4f99-94e2-d0ab676c27a4/Figure_1.png Outreach - How Much Lead & other Toxic Metals are Present after the Eaton Fire? In the aftermath of the Eaton fire devastation, the community is hurting for data to assess health risk and guide the next steps. We sampled dust from 52 houses, from within the burnt areas to miles away, and report aggregated data on lead contamination here! Special mention for graduate student Merritt McDowell and postdoc Theo Tacail for completing this critical work so swiftly. An accompanying Q&A with Prof. Tissot is available here. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/b9de864c-2a84-4dab-afbe-e2587d6d7195/After_the_fires.png Outreach - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/ca7ebf9a-1e51-403f-b8a8-4ad40f19b81a/GPS_OpenHouseFlyer_2024_09_27.jpg Outreach - GPS Open House Thanks to our NSF CAREER award, for our 4th event in the GPS Open House series we were excited to host Dr. Jorge Cham (PhD comics) for a fun evening for families and kids. Jorge was talking about his new book, “Oliver’s Great Big Universe: Volcanoes are hot!”, which breaks down the inner workings of the Earth in a kid friendly manner. Special mention for graduate student Shane Houchin who led the organization of the event. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/b471bdc2-3c62-45fc-a44d-34e19824b341/SRC_WAVE_2024.png Outreach - Summer research 24’ The lab hosted several undergraduate and high-school students for a summer of geochemical research. Special mention for Carlynda Lee and Kate Sanderson for their respective contributions to our project on Ca isotopes as tracers of bone mass balance. They are now helping to turn their findings into peer-reviewed publications! Way to go! https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/c4ab0e28-4f9e-414b-9e97-5021c87a8ef7/GPS_OpenHouseFlyer_2024_05_23.jpg Outreach - GPS Open House Thanks to our NSF CAREER award, this May (2024) we held our third event in the GPS Open House series: an evening of science, art, and dinner for all! Next Open House happening in the Fall. Special mention for graduate student Shane Houchin who led the organization of the event. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/82fbb5fa-cdce-432c-b2b8-25297c380bcf/GPS_OpenHouseFlyer_2023_09_26.jpg Outreach - GPS Open House In collaboration with Caltech Astro and for our second event in the GPS Open House series, we were excited to host Dr. Jorge Cham (PhD comics) for a fun evening for families and kids. Jorge was talking about his new book, “Oliver’s Great Big Universe”, which breaks down our gigantic Universe in a kid friendly manner. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/fa0ccb74-1d44-473a-9a8a-4e7059bf142a/SRC_Wave_2023.png Outreach - Summer research 23’ The lab hosted several undergraduate and high-school students for a summer of geochemical research. Special mention for Rithika Chunduri, Dylan Cleveland and Phillip Vakoula for their respective contributions to our project on Ca isotopes as tracers of bone mass balance. They are now helping to turn their findings into peer-reviewed publications! Way to go! https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/e0ba5ab6-f34c-444f-a7d8-6080eec0b95b/GPS_OpenHouseFlyer_2023_05_26.jpg Outreach - Inaugural GPS Open House Thanks to our NSF CAREER award, this May (2023) we held the first event of our GPS Open House series: an evening of science, art, and dinner for all! Next Open House happening in the Fall. Special mention for graduate student Shane Houchin who led the organization of the event. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/6c0a8feb-6985-4929-ae5e-ebfc1fe14483/SRC_Wave_2022.png Outreach - Summer research 22’ The lab hosted several students for a summer of research. All discovered how to measure the effects of climate change through paleoceanography. Special mention for Annabelle Gao (Brown U.) who carefully investigated the impact of different cleaning procedures on U isotope data extracted from deep-sea corals, and is turning her findings into a paper! https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/f1016aaa-c653-4d45-b842-87c901bdab52/Elements_2021.png Outreach - Elements issue, 21’ My close colleague Mauricio Ibañez-Mejia and I had the pleasure to guest edit an issue of Elements magazine. Articles are aimed for a broad audience, from academic and industrial scientists to students, popular science writers or policy makers. So proud of the amazing work the authors did and the final product (check it out here!). For the occasion, we even created a companion website for a periodic table of heavy stable isotopes! Cover credit to Guillermo Torres-Carreño. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1620846890565-5NNPXVRS38WXNWN8JLPS/Screen+Shot+2021-05-12+at+12.13.44+PM.png Outreach - Caltech Alumni Annual Seminar Day, 19’ For Caltech’s 82nd Annual Reunion (2019), I gave a broad audience presentation of the exciting research ongoing in my group, sharing some of the ups and downs of lab construction, and the exciting new avenues of research we are pursuing. Talk title: From galactic chemical evolution to cancer: How isotope ratios track it all (18.5 MB). https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1620845607438-76QC57VV0QBX12ECGKHE/Screen+Shot+2021-05-12+at+11.50.48+AM.png Outreach - International The discovery (Tissot et al. 2016) that Curium-247 was present in the Early Solar System has ramifications for our understanding of the nucleosynthesis of the heavy elements (e.g., gold, uranium, plutonium, etc…). In this popular science article published in the french magazine L’Astronomie (issue 113, Feb 2018), I explain to the general audience the context, pursuit, and implications of this discovery. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1620851250989-SGNSYY0ZA9XNSS7XX02H/Science_day_Outreach_2.png Outreach - Science Festival During my Ph.D., and in association with the Field Museum, I participated in the two inaugural editions of the France-Chicago Science Festival. We introduced high/middle school students to various topics in the Earth Sciences, including the origin of Earth and Earth's earliest history. The display involved exhibit of meteorites, hands-on activities on how to recognize them and differentiate them from terrestrial rocks, as well as introduction to geological time-scales through posters. Download poster here (2.3 MB), and explanation here (168 KB). https://isotoparium.org/articles daily 0.75 2026-02-16 https://isotoparium.org/openings daily 0.75 2021-05-14 https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1620872288503-XUU4YL251FRISNKV1YPP/Screen+Shot+2021-05-12+at+7.02.59+PM.png Openings Credit: Marvel comics https://isotoparium.org/research daily 0.75 2024-10-10 https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1605052182800-TYCOJVO3UC1DKREEQP7J/Research+%282%29.jpg Research https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621547404039-FI6UI4T0HPKHS164B89Q/Tissotetal16.png Research - Make it stand out Slab of the Allende meteorite showing refractory inclusions (left), and Early Solar System abundances vs mean life of short-lived radionuclide showing a similar isolation time from the interstellar medium for r-process elements (~100 Myr, right). https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621561705131-PLSKA8QLNZUE9XMBQV0R/Tangetal17.png Research - Make it stand out Expectations for different type of alteration that a refractory inclusion could experience. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1622243253461-QM9KNG91B3MB5XPLVBR4/Asaeletal13.png Research Correction for detrital contamination. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621621762882-EE6AQ1WNXZUE7MWNLK4B/Tissot%26Dauphas15.png Research - Make it stand out Oxidative weathering mobilizes U from the crust to the ocean, which is then removed into sedimentary sinks: predominantly carbonates, suboxic, and anoxic sediments. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621622233509-Z5LXON3ITIQGQ1LZ5K80/Tissotetal18.png Research - Make it stand out Sea-level stand exerts a strong control on the δ238U record through mixing of platform-derived carbonates (~0.50–0.60‰ heavier than seawater) and pelagic carbonates (with seawater-like δ238U values). https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621622409861-AUGF5XGMV3VOTTOSR2N1/Tissotetal18_d234U.png Research - Make it stand out Small-scale (1–15‰) variations in seawater (234U/238U) mirror sea-level changes during the last two glacial-interglacial periods. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621622624634-PMRP6S75B32HZA7QP9RP/Chenetal21.png Research - Make it stand out Many Archean and Proterozoic carbonates have unfractionated δ238U values similar to those of continents and riverine runoff, raising questions about (1) U residence time in the ancient ocean, and/or (2) the constancy of the seawater-anoxic sediment isotope fractionation factor. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621623247195-J8IWJ6URUBQV3N5J6ZAN/Kipp%26Tissot21.png Research - Make it stand out Workflow of the Markov Chain Monte Carlo routine used for robust seafloor anoxia quantification. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621637393248-W7PBY75IMEAY1G6YF4FC/Telusetal12.png Research - Make it stand out The data do not follow the correlation expected for Soret diffusion. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621637657963-0SSZ3J1JOE2YJYADY60Y/Tissot%26Dauphas15_igneous.png Research - Make it stand out Igneous rocks show as much variability as some sedimentary archives. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621637861540-2VZREMZJ531AN80U52OA/Tissotetal17.png Research - Make it stand out Dichotomy in the 238U/235U of angrites. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621638534146-GAQ815GOW5DPW1NCXOTV/Tissotetal19.png Research - Make it stand out Single-grain analysis of Jack Hills zircon show very limited variability. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621638739447-625FII6067F5LBXQYJSN/Tissot%26Ibanez21.png Research - Make it stand out MC-ICP-MS instruments have led to the rapid expansion of U isotope investigations in numerous fields. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621640228386-8HW0QJGC7WIDD1UJP5BH/Tissotetal17_angrites.png Research - Make it stand out Angrites with fractionated REE patterns also show lower than average Solar System δ238U values. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/082a02a6-b7ca-40ca-9a43-8fe5c7453f29/Tissotetal22.png Research - Make it stand out Our pressure experiments indicate that the angrite parent body had a radius of at least ~600–770 km (about 3x larger than Vesta, the parent body of HED meteorites). https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1627092351396-XBVX8CRIZSRKUJ4YQDS8/Davisetal18.png Research - Make it stand out There is no correlation between mass dependent (δ49Ti) and independent (ε50Ti) effects in Ti in CAIs, but there tends to be a greater spread in δ49Ti at higher ε50Ti. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1627092412988-N0V7ECSH2ND3HI95GG6P/Charlieretal19.png Research - Make it stand out Ti and Sr isotope anomalies in CAIs (blue/red) and planetary materials (yellow). While CAIs account for at most a 3-5% (vol) of chondrites, they have similar 84Sr enrichments, pointing to the control of the Sr inventory of carbonaceous chondrites of a yet-unidentified cryptic refractory dust (CRD). https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1627092561090-U0M2LPKM5016CMT5S4WL/Pravdistevaetal20.png Research - Make it stand out The Xe-G (s-process) component, clearly contributes to the CAIs’ Xe budget, requiring an s-process carrier to be present in the sample and thermal destroyed at ~1250°C. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1627092961664-Y39RZNW2205NIDKCG5XX/Huetal21.png Research - Make it stand out Schematic of two-stage model needed to explain the REE patterns and isotopic compositions of typical group II CAIs. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1627093523534-RZGNE3VMQAJHGGH5MOUI/Charlieretal21.png Research - Make it stand out A pure 84Sr component is required to explained the percent-level excesses observed in the most refractory fractions (L5) of fine-grained CAIs. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621639681134-9LB9WSWEX2EJC1FCUSIG/Tompkinsetal20.png Research - Make it stand out Zr purification protocol for zircon and baddeleyite. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621639736953-2EBDCQA7GN4R6Y6U66CX/Ibanez%26Tissot19.png Research - Make it stand out Extreme variations in δ94/90Zr are observed in the Duluth Gabbro. https://images.squarespace-cdn.com/content/v1/5f8e20128af33977c0b6725f/1621639845726-CQHG05X8WWJBNJ7D6FMS/Meheutetal21.png Research - Make it stand out For many of the systems studied, equilibrium mass-dependent effects do not seem to be the main driver of Zr isotope fractionation. https://isotoparium.org/downloads daily 0.75 2024-10-10 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