Paleoproterozoic accretion and assembly of the Western Block of North China: A new model
Paleoproterozoic accretion and assembly of the Western Block of North China: A new model
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DOI：
10.1016/j.earscirev.2023.104448
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发表时间：
2023-05
影响因子：
12.1
通讯作者：
C. Yin;Guochun Zhao;W. Xiao;Shoufa Lin;R. Gao;Jian Zhang;J. Qian;Peng Gao;Hengzhong Qiao
中科院分区：
文献类型：
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作者：
C. Yin;Guochun Zhao;W. Xiao;Shoufa Lin;R. Gao;Jian Zhang;J. Qian;Peng Gao;Hengzhong Qiao
本文综合已有的岩石地层学、构造热学、年代学和地球物理资料，研究了阴山地块的形成演化、鄂尔多斯地块的构造性质和孔兹岩带的俯冲碰撞历史，建立了北中国克拉通西部地块的古元古代聚积与组合。新的关键证据表明，2.3~2.0Ga期间，鄂尔多斯地块南缘向北板块俯冲导致鄂尔多斯地块发育了岩浆弧，促成了鄂尔多斯地块与银山地块之间弧后盆地的打开。然后，鄂尔多斯地块北缘转化为被动型大陆边缘，并在1.97-1.91年间弧后盆地最终闭合后，沿孔达尔岩带与阴山地块碰撞形成西部地块。横跨西部地块的地震资料，包括300公里长的南北向接收函数剖面和深度域上的公共转换点叠加图像，明显地显示了其地壳结构，其中两个俯冲板块的遗迹分别保存在鄂尔多斯地块和孔兹莱特带之下。因此，我们提出了一种新的构造模式，以帮助更好地约束中国北部西部地块古元古代的增生和组装。
This paper summarizes available lithostratigraphic, tectonothermal, geochronological and geophysical data to investigate the formation and evolution of the Yinshan Block, the tectonic nature of the Ordos Block, and the subduction to collision history of the Khondalite Belt, and establishes Paleoproterozoic accretion and assembly of the Western Block of the North China Craton. New critical evidence indicates that a magmatic arc developed in the Ordos Block caused by the initiation of northward slab subduction beneath the southern margin of the Ordos Block during 2.3–2.0 Ga, which contributed to the opening of the back-arc basin between the Ordos and Yinshan blocks. And then, the north margin of the Ordos Block was then transformed into a passive-type continental margin and collided with the Yinshan Block along the Khondalite Belt to form the Western Block after final closure of the back-arc basin during 1.97–1.91 Ga. Seismic data across the Western Block including a 300-km-long south-north-trending receiver function profile and a common conversion point stacking image in depth domain obviously show its crustal structure, in which the relics of two subduction slabs were preserved beneath the Ordos Block and the Khondalite Belt, respectively. Therefore, we propose a new tectonic model to help to better constrain Paleoproterozoic accretion and assembly of the Western Block in North China.