Geological Society of America

T69 Where Does the Wind Blow? Aeolian Systems in Time and Space II

Sunday, 4 November 2018
1:30 PM - 5:30 PM
Room 138-139

CLUMPED ISOTOPE ANALYSES OF CARBONATES CONTAINED IN LOESS DEPOSITS TO CONSTRAIN TERRESTRIAL TEMPERATURE AND HYDROLOGICAL CHANGE THROUGH TIME

Paper number: T69-9
Program: Technical Sessions
Time: 3:30 PM – 3:45 PM

Authors

Robert Eagle Presenting Author
University of California, Los Angeles, Los Angeles, CA
Gaojun Li
Nanjing University, Nanjing
Aradhna Tripati
University of California, Los Angeles, Los Angeles, CA
Bryce A. Mitsunaga
University of California, Los Angeles, Los Angeles, CA
Hayley Bricker
University of California, Los Angeles, Los Angeles, CA
Jesse B. Bateman
University of California, Los Angeles, Los Angeles, CA
John Mering
University of Waikato, Hamilton
Jonathan L. Mitchell
UCLA, Los Angeles, CA
Ulrike Seibt
UCLA, Los Angeles, CA
David Neelin
University of California, Los Angeles, Los Angeles, CA
Camille Risi
CNRS, Paris

Abstract

Loess records can serve as archives to resolve regional impacts of terrestrial environmental change. When applied to loess carbonates, including nodular concretionary carbonates, rhizoliths, and gastropod shells, carbonate clumped isotope thermometry has the potential to provide quantitative constraints on temperature and water δ¹⁸O. In monsoonal regions, gastropod clumped isotope compositions appear to record information on conditions during the months of the summer monsoon. Recent work indicates nodular carbonate concretions can have more complex provenance, potentially representing information on recent soil formation conditions at sites with low sedimentation rates, even in glacial age sediments, whereas at higher sedimentation rate sites, nodular carbonate concretions and land snails yield consistent data. In the case of the central Chinese loess plateau we present a case where quantitative temperature and water isotope reconstructions from loess deposits can be used to in direct comparison with isotope-enabled climate models to make inferences on model skill and changes in east Asian monsoon dynamics through time.

Geological Society of America Abstracts with Programs. Vol. 50, No. 6

doi: 10.1130/abs/2018AM-324892

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