Insights into the evolution of the hindu kush–kohistan– karakoram from modern river sand detrital geo-and thermochronological studies

Guangsheng Zhuang*, Yani Najman, Yuntao Tian, Andrew Carter, Lorenzo Gemignani, Jan Wijbrans, M. Qasim Jan, M. Asif Khan

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The Hindu Kush–Kohistan–Karakoram region is critical to understanding the long-term accretion history of the south Asian margin pre-and post-India–Asia collision and the impact of these collisions on the development of high topography. However, knowledge about this region remains incomplete owing to sparse studies. Here, we present a study comprising detrital zircon U–Pb geochronology, detrital muscovite40Ar/39 Ar thermochronology and numerical modelling on40Ar/39 Ar dates. The study identifies zircon U–Pb age peaks at 200, 110–130, 60–80 and 28–40 Ma, supporting the polyphase collisions and crustal growth in the south Asian margin. The modelling study reveals fast cooling–erosion at 115–129, 69–71, 27–35 and <8 Ma, synchronous with collision-related crustal growth, indicating the significant impact of accretion both prior to and post-India–Asia collision. This study, along with studies in eastern Karakoram, reveals along-strike variations in erosion and exhumation with young (since late Miocene) intense erosion focusing on the east–central Karakoram. We suggest that this east–west spatial variation in exhumation may have been associated with more intense crustal shortening, and thus the greater crustal thickness, topographic relief and altitude observed in the eastern compared with the western Karakoram.

Original languageEnglish
Pages (from-to)934-948
Number of pages15
JournalJournal of the Geological Society
Volume175
Issue number6
Early online date30 Jul 2018
DOIs
Publication statusPublished - Nov 2018

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