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DTSTAMP:20260909T131851
DTSTART;TZID=America/Detroit:20260916T100000
DTEND;TZID=America/Detroit:20260916T110000
SUMMARY:Lecture / Discussion:Guest Lecture: Tina Lüdecke
DESCRIPTION:Dr. Lüdecke is a research group leader at Max Planck Institute for Chemistry. She investigates early hominin diets and their ecological context\, with a focus on the onset and evolution of meat consumption and the position of Plio-Pleistocene hominins in African paleo–food webs\, using stable isotopes in tooth enamel. She also reconstructs Neogene paleolandscapes inhabited by early hominins\, examining C4 grassland expansion in relation to changes in seasonality\, precipitation\, temperature\, atmospheric pCO₂\, and tree cover.\n\nHer work combines extensive field research with geochemical approaches — stable isotopes of carbon\, oxygen\, nitrogen\, and zinc\, clumped isotopes\, and multi-element analyses — applied to fossil tooth enamel\, pedogenic carbonates\, and other proxy materials. Her research areas span the Miocene to Pleistocene in eastern and southern Africa\, including early hominin sites of the Afar Depression (Ethiopia)\, Manyara Basin (Tanzania)\, Karonga Basin (Malawi)\, Urema Basin (Mozambique)\, and the Cradle of Humankind (South Africa). Dr. Lüdecke also works on younger\, out-of-Africa localities including Oman\, Indonesia\, Mexico\, and Turkey.\n\nHer goal is to link early hominin dietary adaptations to ecosystem change\, assess the significance of animal resource consumption\, and evaluate the role of dietary flexibility in extinction and adaptive radiation.
UID:151483-21911645@events.umich.edu
URL:https://events.umich.edu/event/151483
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Earth And Environmental Sciences
LOCATION:1100 North University Building - 2008
CONTACT:
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DTSTAMP:20260824T123249
DTSTART;TZID=America/Detroit:20260918T153000
DTEND;TZID=America/Detroit:20260918T163000
SUMMARY:Lecture / Discussion:Smith Lecture: Raquel Alonso-Perez
DESCRIPTION:Where a gemstone or a grain of gold comes from is no longer a question only paper trails can answer. Emeralds show what is possible: using the largest global dataset available\, more than 1\,000 LA-ICP-MS analyses of gem-quality emeralds\, machine learning models trained on just eight trace elements (Li\, V\, Cr\, Fe\, Sc\, Ga\, Rb\, Cs) determine geographic origin with 96.8% accuracy. Gold is the harder problem\, and the more urgent: illegal mining in the Amazon drives mercury contamination and opaque supply chains. We are now applying the same architecture to native gold\, building the curated reference datasets needed to test whether source-related groupings can be resolved across the geologically heterogeneous Amazonian craton\, a stringent challenge given low trace-element concentrations and overlapping geochemical signatures. Built on well-documented reference collections such as Harvard's and partner Brazilian institutions\, this work provides an initial basis for geochemical screening of mercury-linked illicit supply chains\, and a template for the future of mineral traceability.
UID:150796-21910202@events.umich.edu
URL:https://events.umich.edu/event/150796
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Earth And Environmental Sciences
LOCATION:1100 North University Building - 1528
CONTACT:
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