Depositional sequence and detrital zircon age spectra from Ediacaran to Early Cambrian at the northwestern Yangtze craton: Implication for the basin dynamics

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Precambrian Research Pub Date : 2025-02-01 DOI:10.1016/j.precamres.2024.107667

Qiyu Wang , Zhengjiang Wang , Jiahong Liu , Qi Deng , Hao Liu , Zhiwu Li , Gang Zhou , Shuangjian Li , Guoqing Xiong , Yu Xia , Long Ma

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Abstract

The northwestern (NW) Yangtze craton during the Ediacaran–Cambrian period has been considered a passive continental margin; however, there remains contention regarding the timing and mechanisms of the initiation and evolution of the Mianyang–Changning cratonic rift (MCCR) within the NW Yangtze craton. In this study, we present the depositional sequences and detrital zircon geochronology from seven representative sections of the Ediacaran and Early Cambrian strata in the NW Yangtze craton to determine the onset time and evolution processes of this cratonic rift, along with its tectonic and sedimentary responses. Results indicate that multiple tectonic–sedimentary transitions occurred during the Ediacaran–Cambrian, accompanied by fluctuations in sea level and episodic uplift and erosion of carbonate platforms. Furthermore, the provenance of detrital zircon from the Ediacaran and lower Cambrian reveals substantial regional diversity in the Ediacaran, similarity and poly-cyclicity in the Early Cambrian, and temporal variability between the Ediacaran and Early Cambrian. Meanwhile, the summary plot of the detrital zircons from the Ediacaran and Early Cambrian strata indicates that their native basin is characterized neither by an extensional setting nor by a convergent setting, but rather by a collision background. Based on these depositional sequences and detrital zircon age spectra, and combined with previous studies, we conclude that the onset, expansion, filling, and uplift of the MCCR in the NW Yangtze craton during the Ediacaran to Early Cambrian be resulted from peripheral accretionary orogeny associated with the assembly of Gondwana, rather than a continuation of the breakup of Rodinia.

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扬子克拉通西北部埃迪卡拉系—早寒武世沉积序列与碎屑锆石年龄谱：盆地动力学意义

西北扬子克拉通在埃迪卡拉-寒武纪被认为是被动大陆边缘；然而，关于扬子克拉通西北部绵阳-长宁克拉通裂谷（mcr）的形成和演化的时间和机制仍存在争议。本文通过对西北扬子克拉通7个具有代表性的埃迪卡拉系和早寒武世地层剖面的沉积序列和碎屑锆石年代学研究，确定了该克拉通裂谷的起裂时间、演化过程及其构造和沉积响应。结果表明，埃迪卡拉纪—寒武纪发生了多次构造—沉积转变，并伴有海平面波动和碳酸盐岩台地的幕式隆起和侵蚀。此外，埃迪卡拉系和下寒武统碎屑锆石的物源显示出埃迪卡拉系的区域多样性，早寒武统的相似性和多旋回性，以及埃迪卡拉系和早寒武统的时间变异性。同时，埃迪卡拉系和早寒武世地层碎屑锆石总图表明，其原生盆地既不具有伸展背景，也不具有会聚背景，而具有碰撞背景。基于这些沉积序列和碎屑锆石年龄谱，结合前人的研究，我们认为，埃迪卡拉纪至早寒武世，西北扬子克拉通MCCR的起爆、扩张、充填和隆升是与冈瓦纳拼合相关的外围增生造山运动的结果，而不是罗迪尼亚分裂的延续。

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

Precambrian Research 地学-地球科学综合

CiteScore

7.20

自引率

28.90%

发文量

325

审稿时长

12 months

期刊介绍： Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as: (1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology; (2) Geochronology and isotope and elemental geochemistry; (3) Precambrian mineral deposits; (4) Geophysical aspects of the early Earth and Precambrian terrains; (5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes. In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes. Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.