Foreland basin unconformity, Western Himalaya, Pakistan: timing gap, regional correlation and tectonic implications

Progress in Earth and Planetary Science

Research Article

Zahid Imran Bhatti¹  Zia Ur Rehman²  Javed Iqbal Tanoli²  Wahid Abbas²  Muhammad Jamil²  Muhammad Umar³  Lin Ding⁴  Muhammad Qasim⁵ 

[1] Department of Earth Sciences, Abbottabad University of Science and Technology, Abbottabad, Pakistan;Department of Earth Sciences, COMSATS University Islamabad, Abbottabad Campus, 22010, Abbottabad, Pakistan;Department of Earth Sciences, University of Haripur, Haripur, Pakistan;State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100101, Beijing, China;University of Chinese Academy of Sciences, Beijing, China;State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100101, Beijing, China;University of Chinese Academy of Sciences, Beijing, China;Department of Earth Sciences, COMSATS University Islamabad, Abbottabad Campus, 22010, Abbottabad, Pakistan;

关键词: Depositional ages;    Marine–continental sequence;    Unconformity period;    Western Himalaya;    India–Asia collision;   

DOI  :  10.1186/s40645-023-00584-w

 received in 2022-12-26, accepted in 2023-08-17,  发布年份 2023

来源: Springer

【 摘 要 】

This study estimates the timing of unconformity between marine–continental transitional sequence of the Kuldana Formation and continental sequence of the Murree Formation for the first time across the Hazara-Kashmir syntaxis, western Himalaya, Pakistan. The ages of the studied units are constrained using detrital zircon U–Pb geochronology. The maximum depositional ages constrained by weighted mean and youngest detrital zircon age are 37 ± 1.7 Ma and 22.5 ± 0.6 Ma for top of Kuldana and base of Murree formations, respectively. Based on this age, the duration of hiatus is estimated to be ~ 14.5 Ma. The comparison of this unconformity and sedimentation pattern along strike suggests that the initial collision occurred in the central segment causing its early uplift and erosion with development of the unconformity. The sedimentation in the central segment culminated at ~ 37 Ma and resumed at ~ 22.5 Ma. The wider gap in central segment becomes narrower at western and eastern margin suggesting discontinuous deposition due to gradually closure of western and eastern margin. This supports the diachronous collision of the Indian and Asian plates with initial contact at the central segment.

【 授权许可】

CC BY   
© Japan Geoscience Union 2023

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