Apatite fission track evidence for Neogene uplift in the eastern Kunlun Mountains, northern Qinghai-Tibet Plateau, China

Yuan, W. and Dong, J. and Shicheng, W. and Carter, Andrew (2006) Apatite fission track evidence for Neogene uplift in the eastern Kunlun Mountains, northern Qinghai-Tibet Plateau, China. Journal of Asian Earth Sciences 27 (6), pp. 847-856. ISSN 1367-9120.

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Official URL: https://doi.org/10.1016/j.jseaes.2005.09.002

Abstract

Forty-one apatite fission track ages (AFT) were determined on samples collected along a N–S section of the eastern Kunlun Mountains across the Middle and South Kunlun Faults between Buqingshan and Dulan. Measured AFT ages lie between 25±2 and 130±10 Ma, and all are significantly younger than their host rock formation or sediment deposition ages. Modelling the AFT data identifies a two stage regional cooling history that spans the last 100 Myrs. The earliest cooling phase occurred between the late Jurassic and early Tertiary and involved a moderate level of cooling between 20 and 40 °C, equivalent to average exhumation rates of =15 m/Myr. The second phase of cooling took place from ∼20 Ma with cooling rates increasing tenfold. Average exhumation rates for this period are estimated to be in the range of ∼100–150 m/Myr. The first stage of protracted cooling is consistent with regional evidence from the Qiantang and Lhasa terrans where previous studies have noted low rates of denudation in relation to a back-arc extensional setting. The more recent acceleration in cooling seen in the Kunlun data coincides with an increase in sedimentation rates in the adjacent Qaidam Basin. This points to a phase of Neogene uplift and increased erosion of the Kunlun Range, although contemporaneous monsoon strengthening may also have had a role.

Metadata

Item Type:	Article
School:	Birkbeck Faculties and Schools > Faculty of Science > School of Natural Sciences
Depositing User:	Sarah Hall
Date Deposited:	16 Jul 2019 11:47
Last Modified:	02 Aug 2023 17:52
URI:	https://eprints.bbk.ac.uk/id/eprint/28135

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