Provenance of the Late Cretaceous Pab Formation, Sulaiman fold-thrust belt, Pakistan: Insight from the detrital zircon U–Pb geochronology and sandstone petrography,Geological Journal

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Provenance of the Late Cretaceous Pab Formation, Sulaiman fold-thrust belt, Pakistan: Insight from the detrital zircon U–Pb geochronology and sandstone petrography
Geological Journal ( IF 1.4 ) Pub Date : 2022-07-24 , DOI: 10.1002/gj.4546
Muhammad Qasim _{1,

2,

3} , Kamran Tabassum ₃ , Lin Ding _{1,

2} , Javed Iqbal Tanoli ₃ , Muhammad Awais _{2,

4} , Upendra Baral _{1,

2}

Affiliation

This study provides an insight to the provenance of the Late Cretaceous Pab Formation exposed in the Sulaiman fold-thrust belt, Pakistan. The methodology adopted consisted of sandstone petrography and U–Pb detrital zircon geochronology. The sandstone petrography indicates craton interior and recycled orogenic provenances that points to an Indian provenance. The observed basaltic lithics were possibly derived from Rajmahal traps instead of Deccan traps, supported by younger detrital age. The detrital zircon ages exhibit a resemblance to the central and southern Indian provenances, while some detritus also matches the age spectrum of Tethyan Himalayas (~400–800 Ma). Combining sandstone petrography and U–Pb geochronology results, it is suggested that in the Late Cretaceous time, the sediments were mainly fed by the southern and central sources of the Indian Craton. This provenace is possible, as during the Cretaceous time, thermal doming of Indian Plate in the southern part occurred when it was passing over a mantle hotspot. This movement over the hotspot uplifted the southeastern region and increased sediment supply from southern and central Indian provenances and deposited along the western margin as the Pab Formation.

中文翻译：

巴基斯坦苏莱曼褶皱冲断带晚白垩世 Pab 组物源：来自碎屑锆石 U-Pb 年代学和砂岩岩相学的见解

这项研究为巴基斯坦苏莱曼褶皱冲断带出露的晚白垩世 Pab 组的物源提供了见解。所采用的方法包括砂岩岩相学和 U-Pb 碎屑锆石年代学。砂岩岩相学表明克拉通内部和循环造山源指向印度源。观察到的玄武质岩屑可能来自拉杰马哈尔圈闭，而不是德干圈闭，由较年轻的碎屑年龄支持。碎屑锆石的年龄与印度中部和南部的物源相似，而一些碎屑也与特提斯喜马拉雅山脉的年龄谱相匹配（~400-800 Ma）。结合砂岩岩相学和 U-Pb 年代学结果，建议在晚白垩世，沉积物主要来自印度克拉通的南部和中部来源。这个起源是可能的，因为在白垩纪时期，印度板块南部的热拱顶发生在它经过地幔热点时。热点上空的这一运动抬升了东南部地区，增加了印度南部和中部物源的沉积物供应，并沿西部边缘沉积为 Pab 组。

更新日期：2022-07-24

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