藏北柴达木区块的前寒武纪构造演化:对新生代超大陆组装和解体的影响

IF 10.8 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Chen Wu , Jie Li , Wenyou Liu , Andrew V. Zuza , Peter J. Haproff , Lin Ding
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引用次数: 0

摘要

尽管前寒武纪变质基底岩石的性质和藏北柴达木地块的整体构造演化对了解亚洲的形成非常重要,但仍存在争议。前寒武纪超大陆的古地理重建很少考虑其组成的前寒武纪地块的新生代构造变化。这一问题与盖达姆区块及其邻近的地壳碎片尤为相关,它们经历了多个构造事件造成的新生代显著叠压。为了解决这个问题,我们系统地回顾了与中国主要前寒武纪地块的新生代岩浆作用、变质作用和沉积作用有关的主要地质观测资料和区域数据集。这一综述为柴达木区块的新生代构造演化提供了新的约束条件,包括古地理超大陆配置和多次大陆漂移碰撞事件的性质。实地测绘、地质年代和地球化学分析的新成果使我们能够将盖达姆区块的前寒武纪岩石分为四类:(1) 古新生代片麻岩和片岩;(2) 中新生代和 (3) 新新生代变质岩;(4) 新生代侵入体。我们认为,柴达木区块是 "大华北 "区块的一部分,该区块经历了早古生代后碰撞延伸和大陆碰撞,沿早古生代北缘造山带形成了哥伦比亚-努纳超大洲。大华北地块随后经历了与超大陆解体有关的中新生代延伸。此外,我们还提出,大华北地块在新元古代作为罗迪尼亚的一部分贴附在劳伦提亚和西伯利亚的西缘,在新元古代晚期发生断裂,并在古生代早期漂移为一系列微大陆。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Precambrian tectonic evolution of the Qaidam block, northern Tibet: Implications for the assembly and breakup of Proterozoic supercontinents
The nature of Precambrian metamorphic basement rocks and overall tectonic evolution of the Qaidam block in northern Tibet remains debated despite being important to understanding the assembly of Asia. Paleogeographic reconstructions of Precambrian supercontinents rarely consider Phanerozoic tectonic modification of its constituent Precambrian blocks. This issue is particularly relevant for the Qaidam block and its neighboring crustal fragments, which experienced significant Phanerozoic overprinting from multiple tectonic episodes. To address this problem, we systematically reviewed key geological observations and regional datasets related to Proterozoic magmatism, metamorphism, and sedimentation of major Precambrian blocks in China. This synthesis provided new constraints on the Proterozoic tectonic evolution of the Qaidam block, including paleogeographic supercontinent configurations and nature of multiple continental-drift-collision events. New results of field mapping, geochronological, and geochemical analyses allow us to divide the Precambrian rocks of the Qaidam block into four divisions: (1) Paleoproterozoic gneiss and schist; (2) Meso- and (3) Neoproterozoic metasedimentary rocks; and (4) Proterozoic intrusions. We propose that the Qaidam block was part of a “Greater North China” block, which experienced early Paleoproterozoic post-collisional extension and continental collision along the Paleoproterozoic Northern Margin orogen to form the Columbia-Nuna supercontinent. The Greater North China block subsequently experienced Mesoproterozoic extension related to supercontinent breakup. In addition, we propose that the Greater North China block was affixed to the western margin of Laurentia and Siberia as part of Rodinia in the Neoproterozoic, rifted in the late Neoproterozoic, and drifted in the early Paleozoic as a series of microcontinents.
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来源期刊
Earth-Science Reviews
Earth-Science Reviews 地学-地球科学综合
CiteScore
21.70
自引率
5.80%
发文量
294
审稿时长
15.1 weeks
期刊介绍: Covering a much wider field than the usual specialist journals, Earth Science Reviews publishes review articles dealing with all aspects of Earth Sciences, and is an important vehicle for allowing readers to see their particular interest related to the Earth Sciences as a whole.
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