首页|Long-lagged (~19 Myr) response of accelerated river incision to rock uplift on the northern margin of the Tibetan Plateau
Long-lagged (~19 Myr) response of accelerated river incision to rock uplift on the northern margin of the Tibetan Plateau
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NSTL
Elsevier
Quantifying tectonic-climatic interaction in shaping the margins of Tibetan Plateau is essential for understanding outward plateau growth. Here we investigate the histories of rock uplift and erosion along the northwestern margin of the Tibetan Plateau in the Altyn Shan, using low-relief high-elevation surfaces (LRHES) and combined bedrock and detrital apatite (U-Th)/He (AHe) analyses. Bedrock AHe dates and associated thermal modeling of samples collected from the mountain flank reveal a phase of very fast cooling starting at similar to 36 Ma, followed by subsequent moderate cooling since similar to 31 Ma. We argue that this pattern results from rock uplift caused by tectonic activity of the North Altyn fault (NAF), which separates the uplifted Altyn Shan from the low-lying Tarim Basin to the north. However, detrital AHe analysis and associated numerical modeling indicate that accelerated river incision in the Altyn Shan was delayed to as late as similar to 17 Ma merely similar to 10 km away from the NAF. Taken together, the data imply a long-lagged (similar to 19 Myr) response of accelerated river incision to tectonic-driven rock uplift. This delayed incision likely results from very low erosional efficiency associated with arid climate during the interval of similar to 36 - 17 Ma, with increased erosional efficiency during the relatively wet climate of the middle Miocene climate optimum (similar to 17 - 14 Ma). These findings illustrate the interplay between tectonics and climate in developing landforms on the northern margin of the Tibetan Plateau, and bear implications for both the Cenozoic evolution of this margin, and, more broadly, thermochronometer-based study of rock uplift and erosion. (C) 2022 Elsevier B.V. All rights reserved.
North Altyn faultlow-relief high-elevation surfacesapatite (U-Th)/He analysisthermal modelingtectonics-climate interactionALTYN-TAGH FAULTSTRIKE-SLIPHIGH-ELEVATIONTARIM BASINLOW-RELIEFEVOLUTIONHISTORYDISPLACEMENTCONSTRAINTSEXHUMATION
Ye, Yuhui、Wu, Lei、Cowgill, Eric、Tian, Yuntao、Lin, Xiubin、Xiao, Ancheng、Chen, Hanlin
NSTL
Elsevier
