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The provenance of Taklamakan desert sand

Ando, Sergio; Rittner, Martin; Vermeesch, Pieter; Carter, Andrew; Bird, Anna; Stevens, Thomas; Garzanti, Eduardo; Andò, Sergio; Vezzoli, Giovanni; Dutt, Ripul; Xu, Zhiwei; Lu, Huayu

Authors

Sergio Ando

Martin Rittner

Pieter Vermeesch

Andrew Carter

Thomas Stevens

Eduardo Garzanti

Sergio Andò

Giovanni Vezzoli

Ripul Dutt

Zhiwei Xu

Huayu Lu



Abstract

Sand migration in the vast Taklamakan desert within the Tarim Basin (Xinjiang Uyghur Autonomous region, PR China) is governed by two competing transport agents: wind and water, which work in diametrically opposed directions. Net aeolian transport is from northeast to south, while fluvial transport occurs from the south to the north and then west to east at the northern rim, due to a gradual northward slope of the underlying topography. We here present the first comprehensive provenance study of Taklamakan desert sand with the aim to characterise the interplay of these two transport mechanisms and their roles in the formation of the sand sea, and to consider the potential of the Tarim Basin as a contributing source to the Chinese Loess Plateau (CLP). Our dataset comprises 39 aeolian and fluvial samples, which were characterised by detrital-zircon U–Pb geochronology, heavy-mineral, and bulk-petrography analyses. Although the inter-sample differences of all three datasets are subtle, a multivariate statistical analysis using multidimensional scaling (MDS) clearly shows that Tarim desert sand is most similar in composition to rivers draining the Kunlun Shan (south) and the Pamirs (west), and is distinctly different from sediment sources in the Tian Shan (north). A small set of samples from the Junggar Basin (north of the Tian Shan) yields different detrital compositions and age spectra than anywhere in the Tarim Basin, indicating that aeolian sediment exchange between the two basins is minimal. Although river transport dominates delivery of sand into the Tarim Basin, wind remobilises and reworks the sediment in the central sand sea. Characteristic signatures of main rivers can be traced from entrance into the basin to the terminus of the Tarim River, and those crossing the desert from the south to north can seasonally bypass sediment through the sand sea. Smaller ephemeral rivers from the Kunlun Shan end in the desert and discharge their sediment there. Both river run-off and wind intensity are strongly seasonal, their respective transport strength and opposing directions maintain the Taklamakan in its position and topography.

Journal Article Type Article
Publication Date Mar 1, 2016
Journal Earth and planetary science letters
Print ISSN 0012-821X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 437
Pages 127-137
APA6 Citation Rittner, M., Vermeesch, P., Carter, A., Bird, A., Stevens, T., Garzanti, E., …Lu, H. (2016). The provenance of Taklamakan desert sand. Earth and planetary science letters, 437, 127-137. https://doi.org/10.1016/j.epsl.2015.12.036
DOI https://doi.org/10.1016/j.epsl.2015.12.036
Keywords Tarim; Multi-proxy; Provenance analysis; MDS mapping; Chinese Loess Plateau
Publisher URL http://www.sciencedirect.com/science/article/pii/S0012821X15007992
Additional Information Copy of article first published in: Earth and planetary science letters, 2016, v.437

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