Tonian Tectonic‐Strata Regions and their Geological Significance in China |
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| Authors: | XU Yadong ZHANG Kexin HE Weihong YU Yang KOU Xiaohu SONG Bowen LUO Mansheng WANG Lijun MA Zhongjie YANG Fengli |
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| Institution: | 1 Hubei Key Laboratory of Critical Zone Evolution, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2 Central South China Innovation Center for Geosciences, Wuhan Center of the Chinese Geological Survey, Wuhan 430074, China
3 State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China;1 Hubei Key Laboratory of Critical Zone Evolution, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3 State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
4 Center of Global Tectonic, China University of Geosciences, Wuhan 430074, China;5 Institute of Geological Survey, China University of Geosciences, Wuhan 430074, China; 6 State Key Laboratory of Marine Geology, School of Ocean and Earth Science, Tongji University, Shanghai 200092, China |
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| Abstract: | The continent of China developed through the coalescence of three major cratons (North China, Tarim and Yangtze) and continental micro‐blocks through the processes of oceanic crust disappearance and acceretionary‐collision of continental crusts. The strata of the Chinese continental landmass are subdivided into 12 tectonic‐strata regions. Based on the composition of geological features among the three main cratons, continental micro‐blocks and other major global cratons, their affinities can be preliminarily deduced during the Tonian period, using evidence from sedimentary successions, paleobiogeography, tectonic and magmatic events. The Yangtze and Tarim cratons show that they have close affinities during the assembly‐dispersal milestone of the Rodinia Supercontinent. The sedimentary record and magmatic age populations in the blocks suggest that there was a widespread, intensive magmatic event that resulted from a subduction process during ～1000–820 Ma, related to continental rifting around the Yangtze and Tarim cratons. However, they differ greatly from the North China Craton. The continental micro‐blocks in the Panthalassic Ocean could have some missing connection with the North China Craton that persisted until the Middle‐Late Devonian. In contrast, the Alxa Block showed a strong affinity with the Tarim Craton. The revised Tonian paleogeography of the Rodinia Supercontinent is a good demonstration of how to show the relationship between the main cratons and the continental micro‐blocks. |
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| Keywords: | Sedimentary paleogeography Tonian craton micro-block |
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