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Insights into the provenance of the Chinese Loess Plateau from joint zircon U-Pb and garnet geochemical analysis of last glacial loess
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.ORCID iD: 0000-0002-6662-6650
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2018 (English)In: Quaternary Research, ISSN 0033-5894, E-ISSN 1096-0287, Vol. 89, no 3, p. 645-659Article in journal (Refereed) Published
Abstract [en]

The Chinese Loess Plateau, the world's largest and oldest loess record, preserves evidence of Asia's long-term dust source dynamics, but there is uncertainty over the source of the deposits. Recent single-grain detrital zircon U-Pb age analysis has progressed this issue, but debates remain about source changes, and the generation and interpretation of zircon data. To address this, we analyze different groupings of new and existing datasets from the Loess Plateau and potential sources. We also present the results of a first high resolution sampling, multi-proxy provenance analysis of Beiguoyuan loess using U-Pb dating of detrital zircons and detrital garnet geochemistry. The data shows that some small source differences seem to exist between different areas on the Loess Plateau. However, sediment source appears to be unchanging between loess and palaeosols, supporting a recent material recycling hypothesis. Our zircon and garnet data demonstrates, however, that Beiguoyuan experienced a temporary, abrupt source shift during the last glacial maximum, implying that local dust sources became periodically active during the Quaternary. Our results highlight that grouping data to achieve bigger datasets could cause identification of misleading trends. Additionally, we suggest that multi-proxy single-grain approaches are required to gain further insight into Chinese Loess Plateau dust sources.

Place, publisher, year, edition, pages
2018. Vol. 89, no 3, p. 645-659
National Category
Geosciences, Multidisciplinary
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URN: urn:nbn:se:uu:diva-337563DOI: 10.1017/qua.2017.86ISI: 000432179700004OAI: oai:DiVA.org:uu-337563DiVA, id: diva2:1170051
Available from: 2018-01-02 Created: 2018-01-02 Last updated: 2018-07-31Bibliographically approved

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Stevens, Thomas

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