Insights into the provenance of the Chinese Loess Plateau from joint zircon U-Pb and garnet geochemical analysis of last glacial loess
Fenn, Kaja; Stevens, Thomas; Bird, Anna; Limonta, Mara; Rittner, Martin; Vermeesch, Pieter; Andò, Sergio; Garzanti, Eduardo; Lu, Huayu; Zhang, Hanzhi; Lin, Zeng
Dr Anna Bird A.Bird@hull.ac.uk
Lecturer in Geology
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.
|Journal Article Type||Article|
|Publication Date||May 1, 2018|
|Peer Reviewed||Peer Reviewed|
|APA6 Citation||Fenn, K., Stevens, T., Bird, A., Limonta, M., Rittner, M., Vermeesch, P., …Lin, Z. (2018). Insights into the provenance of the Chinese Loess Plateau from joint zircon U-Pb and garnet geochemical analysis of last glacial loess. Quaternary Research, 89(3), 645-659. https://doi.org/10.1017/qua.2017.86|
|Keywords||Earth-Surface Processes; Arts and Humanities (miscellaneous); General Earth and Planetary Sciences|
|Copyright Statement||This article has been published in a revised form in Quaternary research [http://doi.org/10.1017/qua.2017.86]. This version is free to view and download for private research and study only. Not for re-distribution, re-sale or use in derivative works. © University of Washington. Published by Cambridge University Press, 2017 .|
This article has been published in a revised form in Quaternary research [http://doi.org/10.1017/qua.2017.86]. This version is free to view and download for private research and study only. Not for re-distribution, re-sale or use in derivative works. © University of Washington. Published by Cambridge University Press, 2017 .
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