Dr. Marissa Tremblay (she/her/hers)

Marissa earned her BA in Environmental Science from Barnard College in 2012 and her PhD in Earth and Planetary Science from the University of California, Berkeley in 2017. Following her PhD, Marissa was briefly a University of California President’s Postdoctoral Fellow at the University of California, Davis, before joining the Scottish Universities Environmental Research Centre (SUERC) as a Royal Society Newton International Fellow. Marissa joined the Department of Earth, Atmospheric, and Planetary Sciences at Purdue University as an Assistant Professor in August 2019. For more information, please check out her Curriculum Vitae.

Marissa’s interest in noble gas geochemistry and geochronology was sparked as an undergraduate working in Sidney Hemming’s 40Ar/39Ar laboratory at Lamont-Doherty Earth Observatory. She completed a senior thesis with Sidney and Nick Christie-Blick on mechanisms and timing of Neogene extension in the Death Valley Region of California. While she carried out other summer research projects as an undergraduate at UT Austin studying CO2 in soils and at Princeton studying paleo-nutrient conditions in the Atlantic Ocean, she couldn’t be pulled away from noble gases. As a PhD student at UC Berkeley working with David Shuster, she developed cosmogenic noble gas paleothermometry and used conventional thermochronometers to study the evolution of topography and rivers in southern Tibet. As a postdoctoral fellow at SUERC, Marissa switched gears, working Darren Mark to study the thermal history of lunar meteorites using 40Ar/39Ar thermochronology. Since becoming the principle investigator of T@P, Marissa continues to work on a wide range of problems related to surface processes on Earth and other planets through the lens of noble gas geochemistry, which you can read about on our Research page.

Twitter: @tremblaymarissa

Google Scholar: (link)

Picture of Ryan Ickert


Dr. Ryan Ickert (he/him/his)

Ryan is a Senior Research Scientist at Purdue who spends time working in both our thermochronology group and the Radiogenic Isotope Geology Lab. While Ryan is relatively new to the noble gas world, he is extremely excited to soon re-determine the neon isotopic composition of air!

Graduate Students

Emily Apel (she/her/hers)

Emily is joining Thermochronology @ Purdue in Fall 2021 as a PhD student. She is broadly interested in paleoclimate studies, specifically using cosmogenic radionuclide dating and isotope geochemistry. She is also interested in time periods that are analogs of today’s climate and applying knowledge of the past to gain insight into how climate change will affect the planet in the future.

John Fink (he/him/his)

John is a Masters student in T@P. John has broad interests in mineralogy, crystallography, and geochemistry with respect to crystal structures, and is also interested in various analytical techniques used to explore atomic-scale phenomena. His research in the T@P group focuses on developing the (U-Th)/He system in fossil gar fish scales for Cenozoic basin thermal history reconstruction.

Moe Mijjum (she/her/hers)

Moe is a PhD student in T@P. She is interested in the intersection of geochemistry and planetary science, and its applications towards constraining the timing/evolution of planetary surfaces and interstellar objects. Moe’s research focuses reconstructing the thermal histories of E chondrites using cosmogenic noble gas observations, noble gas diffusion data, and orbital dynamics simulations. She is also working to constrain the duration of hiatuses between eruptions in the Deccan Traps large igneous province using paleo-exposure records from cosmogenic noble gases.

Undergraduate Students

Devin Blair (she/her/hers)

Devin is one of three undergraduates participating in the 2021-2022 Stahura Meteorite Undergraduate Research Fund research internship. She is working with Marissa and Ph.D. student Moe Mijjum to characterize and collect cosmogenic exposure ages from E-chondrites.

John Herring

John is an undergraduate in EAPS and began working in the T@P lab in spring 2020 as an Undergraduate Research in STEM Applications (URSA) Scholar. John’s work focuses on characterizing the type and abundance of defects in different synthetic and natural quartz samples, as well as exploring the effect of different types of defects on noble gas diffusion in quartz using first principles calculations.

Juliana Peckenpaugh (she/her/hers)

Juliana is an undergraduate in EAPS and began working in the T@P lab in spring 2020. Juliana started out characterizing the internal structures of fossil gar fish scales from Cretaceous-Paleogene strata in the Hell Creek region of Montana using scanning electron microscopy. Her continued work in the lab focuses on using (U-Th)/He thermochronology to date the Kentland impact structure.

T@P Alumni

Isabella Zuffoletti

Izzy was an undergraduate in EAPS and began working in the T@P lab in spring 2020 as a URSA Scholar. Izzy worked on putting together a flexible, user-friendly code for propagating errors in diffusion kinetics data properly. Izzy is now pursuing a Masters degree in Purdue EAPS with Dr. Xiaotao Yang.