Provenance of cretaceous sediments in the West Kunlun piedmont belt and implications for tectonic evolutionary events

IF 2 3区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Frontiers in Earth Science Pub Date : 2024-07-30 DOI:10.3389/feart.2024.1431866

Yang Gao, Lin Jiang, Weiyan Chen, Fujie Jiang, Hongkui Dong, Wen Zhao, Changyu Dong, Yingqi Feng

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Abstract

The West Kunlun orogenic belt located in the northwestern margin of the Qinghai-Tibet Plateau is an important record of the formation and northward extension of the plateau, but the current research mainly focuses on the tectonic activities of the Cenozoic era, and there is still considerable controversy regarding the formation and evolutionary history of pre-Cenozoic orogenic belts. This study focuses on Cretaceous sandstone samples from the Kedong region in the piedmont belt of the West Kunlun orogenic belt. U-Pb geochronological analysis was performed on 200 detrital zircon grains from the core samples. Combined with stratigraphic data and previous research, the main provenance direction was investigated to constrain the tectonic evolutionary history of the orogenic belt’s peripheral regions. The results show that the detrital zircons are aged from 290 to 208 Ma, 520–310 Ma, 810–580 Ma, 1,400–880 Ma and 2,548–1,730 Ma, reflecting the complexity of provenance in this area. Based on a comprehensive analysis of the characteristics of igneous rocks, zircon age composition and stratigraphic conditions in potential source areas, it is concluded that the primary source regions include the East Kunlun orogenic belt and the North and South Kunlun terranes, with a low likelihood of contributions from within the Tarim Basin. The evolution of the West Kunlun orogenic belt can generally be divided into two opening and two closing phases. The detrital zircon ages predominantly exhibit two peak values at 259 Ma and 459 Ma, respectively representing the ages of transition from oceanic crust subduction to continent-continent collision for the Paleo-Tethys Ocean and the Proto-Tethys Ocean. Additionally, there is a temporal gap between the evolution of the Proto-Tethys Ocean and the Paleo-Tethys Ocean. The Triassic period marks a transitional phase in tectonic evolution, shifting into an intracontinental evolutionary stage. This study provides new geochronological evidence for the early developmental history of the West Kunlun orogenic belt.

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西昆仑山麓带白垩纪沉积物的产状及其对构造演化事件的影响

位于青藏高原西北缘的西昆仑造山带是青藏高原形成和向北延伸的重要记录，但目前的研究主要集中于新生代的构造活动，对前新生代造山带的形成和演化历史仍存在较大争议。本研究的重点是西昆仑造山带腹地克东地区的白垩纪砂岩样本。对岩心样品中的200粒锆英石碎片进行了U-Pb地质年代分析。结合地层资料和以往研究，研究了主要产地方向，以制约造山带外围地区的构造演化历史。结果表明，碎屑锆石的年龄分别为290-208Ma、520-310Ma、810-580Ma、1,400-880Ma和2,548-1,730Ma，反映了该地区出露的复杂性。根据对潜在源区的火成岩特征、锆石年龄组成和地层条件的综合分析，得出的结论是，主要源区包括东昆仑造山带和南北昆仑地块，塔里木盆地内的贡献可能性较低。西昆仑造山带的演化一般可分为两个开启阶段和两个关闭阶段。碎屑锆石年龄主要表现为259Ma和459Ma两个峰值，分别代表古特提斯洋和原特提斯洋从大洋地壳俯冲向大陆-大陆碰撞过渡的年龄。此外，原特提斯洋与古特提斯洋的演化在时间上也存在差距。三叠纪标志着构造演化的过渡阶段，进入了大陆内演化阶段。这项研究为西昆仑造山带的早期发展史提供了新的地质年代证据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Frontiers in Earth Science Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

3.50

自引率

10.30%

发文量

2076

审稿时长

12 weeks

期刊介绍： Frontiers in Earth Science is an open-access journal that aims to bring together and publish on a single platform the best research dedicated to our planet. This platform hosts the rapidly growing and continuously expanding domains in Earth Science, involving the lithosphere (including the geosciences spectrum), the hydrosphere (including marine geosciences and hydrology, complementing the existing Frontiers journal on Marine Science) and the atmosphere (including meteorology and climatology). As such, Frontiers in Earth Science focuses on the countless processes operating within and among the major spheres constituting our planet. In turn, the understanding of these processes provides the theoretical background to better use the available resources and to face the major environmental challenges (including earthquakes, tsunamis, eruptions, floods, landslides, climate changes, extreme meteorological events): this is where interdependent processes meet, requiring a holistic view to better live on and with our planet. The journal welcomes outstanding contributions in any domain of Earth Science. The open-access model developed by Frontiers offers a fast, efficient, timely and dynamic alternative to traditional publication formats. The journal has 20 specialty sections at the first tier, each acting as an independent journal with a full editorial board. The traditional peer-review process is adapted to guarantee fairness and efficiency using a thorough paperless process, with real-time author-reviewer-editor interactions, collaborative reviewer mandates to maximize quality, and reviewer disclosure after article acceptance. While maintaining a rigorous peer-review, this system allows for a process whereby accepted articles are published online on average 90 days after submission. General Commentary articles as well as Book Reviews in Frontiers in Earth Science are only accepted upon invitation.