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

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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

Funding

Funding Financial support was provided under the Initial Training Network iTECC by the EU REA under the FP7 implementation of the Marie Curie Action (grant # 316966). We would like to thank K. Larson, M. Soret, an anonymous reviewer and the editor I. Fitzsimons for their critical reviews that greatly improved this paper. We thank X. Cao and M. Brandon for discussions on the interpretation of detrital thermochronometric dates. E. Deloule, M. Champenois, G. Govin and J. Davenport are acknowledged for help during detrital zircon U–Pb analysis at CRPG (CNRS). Funding Financial support was provided under the Initial Training Network iTECC by the EU REA under the FP7 implementation of the Marie Curie Action (grant # 316966).

FundersFunder number
Rea Charitable Trust
Marie Curie
Centre National de la Recherche Scientifique
Seventh Framework Programme316966

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