Geochemistry Seminars

Blue Water Diving off Puerto Rico to Collect Planktic Foraminifera. Credit: Bärbel Hönisch

Division seminars are an opportunity for our research and Lamont-wide communities to participate in research discussions and engage in networking and collaboration. Speakers include Lamont and outside graduate students, postdocs, research techs, faculty, and others doing work of interest to the scientific community, with a commitment to including diverse speakers from underrepresented groups.

Spring 2026

Date: Feb 4, 2026
Title: The last remnant of the Laurentide Ice Sheet
Presenter: Nicolás Young, Lamont-Doherty Earth Observatory

Date: Feb 17, 2026
Title: Dating Deformation with Titanite: Examples from Exhumed Ductile Shear Zones and Deformation Experiments
Presenter: Amy Moser, Hamilton College

Date: Feb 25, 2026
Title: Continuum between solid and solution: differential retention and properties of metal ions, polyanions, and colloids
Presenter: Benjamin Bostick, Lamont-Doherty Earth Observatory

Date: Mar 4, 2026
Title: The Persistence and Importance of Spinels: An Extraterrestrial Perspective
Presenter: Denton Ebel, American Museum of Natural History

Date: Mar 11, 2026
Title: Tiny but mighty: Geochemical and physical characteristics of mineral dust from Allan Hills ice cores
Presenter: Austin Carter, Princeton University

Date: Mar 25, 2026
Title: Radiogenic Isotopes in Ocean Sediments South of Africa: What do they tell us?
Presenter: Allison Franzese, Lamont-Doherty Earth Observatory

Date: Apr 1, 2026
Title: What the GISP2 bedrock reveals about Greenland Ice Sheet history: new constraints from triple cosmogenic isotopes (36Cl-26Al-10Be)
Presenter: Joanna Charton, Lamont-Doherty Earth Observatory

Date: Apr 8, 2026
Title: Tracking freshwater from the Arctic to the North Atlantic: trace metals, macronutrients, and oxygen isotopes as tracers in the coastal ocean
Presenter: Laramie Jensen, Lamont-Doherty Earth Observatory

Date: Apr 15, 2026
Title: Geochronologic Constraints on Earthquake Timing and Tectonic Drivers Across Diverse Faulting Regime
Presenter: Jenna Everard, Lamont-Doherty Earth Observatory

Date: Apr 22, 2026
Title: Uncovering patterns from variability in field-collected microplastic data
Presenter: Sarah Davis, University of Rhode Island

Date: Apr 29, 2026
Title: Understanding Earth surface processes on billion-year to modern timescales using non-traditional stable isotope geochemistry
Presenter: Sarah Aarons, Lamont-Doherty Earth Observatory

Date: May 20, 2026
Title: Understanding subsurface processes through the Oman ophiolite and AI
Presenter: John Aiken, NJORD - Centre for Studies of the Physics of the Earth

Fall 2025

Date: Sep 10, 2025
Title: Coastal Aquifers as Hidden Players in the Alkalinity Budget: Implications for the Carbon Cycle Across Glacial–Interglacial Timescales
Presenter: Yael Kiro, Weizmann Institute of Science

Date: Sep 17, 2025
Title: Probing Past Seismicity from California to Japan: Clay Mineralogy and K/Ar Illite Dating of Fault Slip
Presenter: Jenna Everard, Lamont-Doherty Earth Observatory

Date: Oct 15, 2025
Title: Reconstructing early Cenozoic climate and atmospheric CO2 with Bayesian forward proxy system models
Presenter: Dustin Harper, University of Utah

Date: Oct 22, 2025
Title: Zirconium isotopic fractionation in the ocean and its application for a tracer of seawater composition
Presenter: Linqing Huang, Lamont-Doherty Earth Observatory

Date: Oct 31, 2025
Title: The Evolution of the Antarctic Ice Sheet Over the Plio-Pleistocene Inferred from Scotia Sea Sediments
Presenter: Claire Jasper, Lamont-Doherty Earth Observatory

Date: Nov 5, 2025
Title: Introducing a new deep-time fluid inclusion paleothermometer
Presenter: Tim Lowenstein, University of Binghampton

Date: Nov 12, 2025
Title: Deeper and Stronger North Atlantic Subtropical Gyre During the Last Glacial Maximum
Presenter: Jack Wharton, University College London

Date: Nov 14, 2025
Title: Redox-driven mineral and organic associations in Jezero Crater, Mars
Presenter: Joel Hurowitz, Stony Brook University

Date: Nov 17, 2025
Title: Cascading Impacts on Ocean Biogeochemistry from AMOC-collapse Induced by Stochastic Variability
Presenter: Paul Lerner, Columbia's Applied Physics and Applied Mathematics Department and NASA GISS

Date: Nov 19, 2025
Title: Metals and Health: Yes, It’s the Environment!
Presenter: Ana Navas-Acien, Columbia University Mailman School of Public Health

Date: Dec 3, 2025
Title: Comparing lead paint detection using perovskite fluorescence and X-ray fluorescence in New York City
Presenter: Lex van Geen, Lamont-Doherty Earth Observatory, and Wim Noorduin, Institute for Atomic and Molecular Physics

Spring 2025

Date: Jan 29, 2025
Title: Unlocking the potential of Antarctic permafrost to constrain climate models
Presenter: Jacob Anderson, Lamont-Doherty Earth Observatory

Date: Feb 10, 2025
Title: ⁸¹Kr and ⁴¹Ca - New isotope tracers for earth sciences
Presenter: Zheng-Tian Lu, University of Science and Technology of China

Date: Feb 12, 2025
Title: Geogenic Molybdenum in Carbonate Aquifers - Implications for Drinking Water and Aquifer Management
Presenter: Thomas Pichler, Bremen University

Date: Feb 21, 2025
Title: The potential and risks of atmospheric CO2 removal in net zero pathways: Science and policy reflections
Presenter: Gideon Henderson, Oxford University

Date: Mar 5, 2025
Title: Exploring Mechanisms for Arc-Wide Exhumation of the Aleutian Islands in the Late Miocene-Early Pliocene
Presenter: Anahi Carrera, Brown University

Date: Mar 7, 2025
Title: Estimates of global sea-air CO2 fluxes: thoughts on observational versus observation-based products
Presenter: Rik Wanninkhof, NOAA

Date: Mar 26, 2025
Title: The Most Trusted Water Mass Proxy: The Good, the Bad, and the Beautiful
Presenter: Chandranath Basak, University of Delaware

Date: Apr 2, 2025
Title: Nanoplastic and Microplastic Pollution: Tiny in Name, Possibly Mega in Impact
Presenter: Beizhan Yan, Lamont-Doherty Earth Observatory

Date: Apr 9, 2025
Title: Update from GreenDrill: Subglacial Sediment and Bedrock Record Reduced Northern Greenland Ice Sheet Extent During the Pleistocene
Presenter: Allie Balter-Kennedy, Lamont-Doherty Earth Observatory

Date: Apr 16, 2025
Title: Long-term parenteral nutrition and exposure to non-essential trace elements: a post-mortem study
Presenter: Patrick Parsons, University at Albany

Date: Apr 23, 2025
Title: Snapshots of Global Ocean Heat Content Over the Past 3 Million Years from Antarctic Ice Cores
Presenter: Sarah Shackleton, WHOI

Date: Apr 30, 2025
Title: Uncovering Bering Land Bridge history using the marine nitrogen cycle
Presenter: Jesse Farmer, University of Massachusetts Boston

Date: May 7, 2025
Presenter: Adelina Rolea, Lamont-Doherty Earth Observatory

Fall 2024

Date: Oct 9, 2024
Title: Reconstructing oxygen concentrations and carbon storage in the glacial Atlantic Ocean
Presenter: Kassandra Costa, Woods Hole Oceanographic Institution

Date: Oct 16, 2024
Title: Duality of Minerals in Soil Organic Carbon Storage — Protection and Degradation
Presenter: Jianshu Duan, Princeton University

Date: Oct 30, 2024
Title: Anthropogenic Impacts to the Global Mercury Cycle: Cumulative Releases and Long-term Fate
Presenter: Benjamin Geyman, Harvard University

Date: Nov 6, 2024
Title: Holocene Ice Shelf Collapse and Subsequent Antarctic Ice Sheet Retreat in Lützow-Holm Bay, East Antarctica, Driven by Warm Deep Water Inflow and Sea Level Rise
Presenter: Yusuke Suganuma, Japan's National Institute of Polar Research

Date: Nov 13, 2024
Title: I didn’t know you could do that
Presenter: Bill McDonough, University of Maryland, College Park

Date: Nov 22, 2024
Title: No iron fertilization of the Pliocene North Pacific
Presenter: Jordan Abell, Lehigh University

Spring 2024

Date: Feb 7, 2024
Title: A high-resolution geochemical record of the Paleocene-Eocene Thermal Maximum in the eastern Tethys
Presenter: Ying Cui, Montclair State University

Date: Feb 28, 2024
Title: Alpine glacier histories reconstructed through cosmogenic-nuclide exposure dating from local to global scales
Presenter: Joe Tulenko, University at Buffalo

Date: Mar 13, 2024
Title: Isotopic reconstructions of plant photorespiration since the Last Glacial period
Presenter: Max Lloyd, Penn State

Date: Mar 29, 2024
Title: Out of a crucible of stone: How 800 million years of tectonism forged the Cradle of Humanity
Presenter: Samuel C. Boone, University of Sydney

Date: Apr 3, 2024
Title: Complex Scientific Discoveries: Who Gets Credit, Who Gets Overlooked: Hydrothermal Vent Example
Presenter: Suzanne O’Connell, Wesleyan University

Date: Apr 10, 2024
Title: Ages of fluorite occurrences may date mantle fluid conduits from transtension in the western US
Presenter: Troy Rasbury, Stony Brook University

Date: May 1, 2024
Title: Clarifying apatite (U-Th)/He erosion rate histories with synchrotron uranium mapping
Presenter: Stephen Cox, Lamont-Doherty Earth Observatory

Fall 2023

Date: Sep 13, 2023
Title: Isotope analyses and compositions of diamond-forming fluids - past, present and future
Presenter: Yaakov Weiss, Hebrew University of Jerusalem

Date: Sep 20, 2023
Title: Uranium Isotopic Tracers in the Northern Plains: Identifying U Sources, Tracing Cycling Patterns, and Assessing Human Exposure
Presenter: Anirban Basu, Mailman School of Public Health at Columbia University

Date: Oct 11, 2023
Title: Projecting 21st-century changes in high-latitude Southern Ocean physics and biogeochemistry using a novel modeling tool
Presenter: Cara Nissen, University of Colorado, Boulder

Date: Oct 18, 2023
Title: Radiogenic heat production in continental crust: heat flow, xenoliths, and thermochronology
Presenter: Francisco Apen, Princeton University

Date: Oct 25, 2023
Title: Probing Antarctica’s glacial history with marine sediments from iceberg alley
Presenter: Sidney Hemming, Lamont-Doherty Earth Observatory

Date: Nov 1, 2023
Title: The talk Noble gas tracers of air-sea gas exchange and hydrothermal gas sources and processes
Presenter: Alan Seltzer, Woods Hole Oceanographic Institution

Date: Nov 15, 2023
Title: Lithospheric and Atmospheric Changes Associated with Rapid, Pulsed Assembly of Mafic Upper Crust: Assembly of the Karoo LIP Intrusive Complex
Presenter: Sean Gaynor, Princeton University

Date: Nov 29, 2023
Title: Understanding the Role of Global Meridional Overturning Circulation in the Ocean Carbon Sink
Presenter: Yi Liu, Princeton University

Date: Dec 6, 2023
Title: Microanalytical approaches to understanding mineral processes in hydrothermal systems
Presenter: David McNamara, University of Liverpool

Spring 2023

Date: Feb 1, 2023
Title: Climate Resilience, Groundwater, Rice and Arsenic
Presenter: Yan Zheng, Southern University of Science and Technology

Date: Feb 15, 2023
Title: Microbial Growth Efficiency: exploring how microbial rates vary in moving energy and carbon through the ocean
Presenter: Kim Popendorf, Rosenstiel School for Marine & Atmospheric Science at University of Miami

Date: Mar 8, 2023
Title: Hydrothermal Chimney Weathering Time Series, Endeavour Segment, Juan de Fuca Ridge: The view from the sulfur edge
Presenter: Sarah Nicholas, Brookhaven National Laboratory

Date: Mar 15, 2023
Title: Industry perspectives on geochemical methods for carbon removal verification
Presenter: Elizabeth Troein, Isometric

Date: Mar 21, 2023
Title: Evolution of hydrothermal systems over different time scales
Presenter: Carolina Munoz-Saez, University of Nevada, Reno

Date: Mar 29, 2023
Title: At the crossroads of mercury, fisheries, and climate change
Presenter: Mi-Ling Li, University of Delaware

Date: Apr 5, 2023
Title: The influence of sulfur on magmatic evolution in volcanic arcs
Presenter: Michelle Muth, Smithsonian National Museum of Natural History

Date: Apr 12, 2023
Title: Biogeochemical cycling of trace elements from urban agricultural soils to deep ocean waters
Presenter: Sarick Matzen, University of Minnesota

Date: Apr 19, 2023
Title: The ocean carbon sink in Earth System Models
Presenter: Jens Terhaar, Woods Hole Oceanographic Institution

Date: May 31, 2023
Title: Dissolved Oxygen Variability Across Scales: Insights from Earth System Models
Presenter: Yassir Eddebbar, Scripps Institution of Oceanography

Fall 2022

Date: Sep 14, 2022
Title: Nutrient deposition to the Tropical North Atlantic Ocean and Amazon from long-range transported African aerosols
Presenter: Anne Barkley, Lamont-Doherty Earth Observatory

Date: Sep 28, 2022
Title: Arctic carbon cycling under past and present climate change deduced from the Arctic Ocean sediment record
Presenter: Jannik Martens, Lamont-Doherty Earth Observatory

Date: Oct 26, 2022
Title: Enhanced ocean oxygenation during Cenozoic warm periods
Presenter: Alexandra Auderset, Princeton University

Date: Nov 3, 2022
Title: Salty waters: Life’s origins and biological habitability on Earth (and Mars?)
Presenter: Benjamin Tutolo, University of Calgary

Date: Nov 10, 2022
Title: Identity as a Framework to Understand Biomineralization
Presenter: Rob Ulrich, UCLA

Date: Nov 16, 2022
Title: The origin of the Thacker Pass lithium deposit, the largest known lithium resource in the United States
Presenter: Thomas R. Benson, Lithium Americas Corporation

Date: Nov 30, 2022
Title: Nd Isotopes in the GEOTRACES Eastern Pacific and Arctic Sections
Presenter: Yingzhe Wu, Lamont-Doherty Earth Observatory

Spring 2022

Date: Jan 19, 2022
Title: Arctic ice-sheet sensitivity to centennial - and millennial-scale climate variability
Presenter: Nicolás Young, Lamont-Doherty Earth Observatory

Date: Jan 26, 2022
Title: Investigating Basalt Chemical Weathering in Iceland and its Role in Climate Regulation with Stable Calcium Isotopes
Presenter: Claire Nelson, Lamont-Doherty Earth Observatory

Date: Feb 2, 2022
Title: Using Atmospheric Observations to Understand Urban and Remote Carbon Cycling
Presenter: Luke Schiferl, Lamont-Doherty Earth Observatory

Date: Feb 9, 2022
Title: How do you maintain a habitable planet?
Presenter: Philip Pogge von Strandmann, Johannes Gutenberg University

Date: Feb 16, 2022
Title: Fault Rock K-Ar Geochronology and the DATEEQ Project
Presenter: Stephen Cox, Lamont-Doherty Earth Observatory

Date: Feb 23, 2022
Title: Radiophysical Properties of Venus Highlands
Presenter: Martha Gilmore, Wesleyan University

Date: Mar 2, 2022
Title: Extended residence times of sediments in large rivers and their implication for preserving climatic and tectonic signals in sedimentary archives
Presenter: Michal Ben-Israel, University of California, Merced

Date: Mar 9, 2022
Title: Reconstructing Earth’s global mean surface temperature across the Phanerozoic Eon: Challenges, new approaches, and preliminary insights
Presenter: Emily Judd, Syracuse University and The Smithsonian

Date: Mar 23, 2022
Title: Did Thwaites Glacier readvance in the Holocene? Insights from cosmogenic nuclides in subglacial bedrock
Presenter: Keir Nichols, Imperial College London

Date: Mar 30, 2022
Title: Quantifying environmental benefits (and costs) of public spaces in New York City
Presenter: Benjamin Bostick and Robert Newton, Lamont-Doherty Earth Observatory

Date: Apr 13, 2022
Presenter: Farideh Hosseini Narouei, Lamont-Doherty Earth Observatory

Date: Apr 20, 2022
Title: Paleoclimate reconstruction: New insights from triple oxygen isotopes
Presenter: Jordan Wostbrock, Yale University

Date: Apr 27, 2022
Title: Controlling factors of As concentration in fossil groundwaters, the case of Po Plain (N Italy)
Presenter: Marco Rotiroti, University of Milano-Bicocca

Fall 2021

Date: Sep 22, 2021
Title: Darcy Lecture in Groundwater: How are Geochemical Reactions in Aquifers Connected to Climate Change Mitigation?
Presenter: Chen Zhu, Indiana University

Date: Sep 29, 2021
Title: Reconstructing air-sea CO2 fluxes using machine learning: Incorporating Physics
Presenter: Val Bennington, Lamont-Doherty Earth Observatory

Date: Oct 6, 2021
Title: What can we learn about particle dynamics in the ocean from the distribution and geochemistry of particles?
Presenter: Phoebe Lam, University of California Santa Cruz

Date: Oct 13, 2021
Title: Chromium Stable Isotope Variations in the Early Solar System and Deep Earth
Presenter: Matt Jeram, Lamont-Doherty Earth Observatory

Date: Oct 18, 2021
Title: Marine-based outlet glacier evolution and the role of ocean forcing through the Quaternary
Presenter: Michelle Guitard, Lamont-Doherty Earth Observatory

Date: Dec 1, 2021
Title: Methane, Monsoons, and Milankovitch Modulation of Millennial-scale Climate Variability
Presenter: Kaustubh Thirumalai, University of Arizona, Tucson

Date: Dec 8, 2021
Title: Unexpected ages: How subsurface paleo-fluid flow has evolved in the Paradox Basin
Presenter: Lydia Bailey, University of Arizona

Seminar Organizers