Apatite fission track and (U-Th)/He ages from the Higher Himalayan Crystallines, Kaghan Valley, Pakistan: Implications for an Eocene Plateau and Oligocene to Pliocene exhumation

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• 作者：Franziska D.H. Wilke ; Edward R. Sobel ; Patrick J. O¡¯Brien ; Daniel F. Stockli
• 关键词：NW Himalaya ; Kaghan Valley ; Thermochronology ; AFT ; (U&ndash ; Th)/He ; Cooling rates
• 刊名：Journal of Asian Earth Sciences
• 出版年：2012
• 出版时间：1 October, 2012
• 年：2012
• 卷：59
• 期：Complete
• 页码：14-23
• 全文大小：1107 K

文摘

Apatite fission track and apatite and zircon (U-Th)/He ages were obtained from high- and ultra high-pressure rocks from the Kaghan Valley, Pakistan. Four samples from the high altitude northern parts of the valley yielded apatite fission track ages between 24.5 ¡À 3.7 and 15.6 ¡À 2.1 Ma and apatite (U-Th)/He ages between 21.0 ¡À 0.6 and 5.3 ¡À 0.2 Ma. These data record cooling of the formerly deeply-subducted high-grade metamorphic rocks induced by denudation and exhumation consistent with extension and back sliding along the reactivated, normal-acting Main Mantle Thrust. Overlap at around 10 Ma between fission track and (U-Th)/He ages is recognised at one location (Besal) showing that fast cooling occurred due to brittle reactivation of a former thrust fault. Widespread Miocene cooling is also evident in adjacent areas to the west (Deosai Plateau, Tso Morari), most likely related to uplift and unroofing linked to continued underplating of the Indian lower crust beneath Ladakh and Kohistan in the Late Eocene to Oligocene. In the southernmost part of the study area, near Naran, two significantly younger Late Miocene to Pliocene apatite fission track ages of 7.6 ¡À 2.1 to 4.0 ¡À 0.5 Ma suggest a spatial and temporal separation of exhumation processes. These younger ages are best explained by enhanced Late Miocene uplift and erosion driven by thrusting along the Main Boundary Thrust.