| Tectonic affinity of Paleozoic stratigraphic slices along the northern margin in Dabie Orogen, central China: evidence from Pb isotope of rocks |
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| 作者姓名： | XU Qidong OUYANG Jianping ZHANG Benren KUANG Shaoping |
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| 作者单位： | Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China,Institute of Geochemistry, China University of Geosciences, Wuhan 430074, China,Institute of Geochemistry, China University of Geosciences, Wuhan 430074, China,Institute of Geochemistry, China University of Geosciences, Wuhan 430074, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China (Grant No. 49794043) |
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| 摘 要： | Metavolcanic and metasedimentary rocks from the Paleozoic tectono-stratigraphic units along the northern margin in the Dabie orogen show that there are two types of Pb isotopic compositions, which have some affined regularity with tectonic subdivision. Compared with the main tectonic units of the Qinling orogen, the Dingyuan Formation should be the part of the South Qinling orogenic belt or the northern margin of the Yangtze craton, characterized by less radiogenic Pb isotopic composition, and the Guishan Formation, Nanwan Formation-Foziling Group and the Carboniferous should be the part of the North Qinling orogenic belt which is extended to the east, characterized by more radiogenic Pb isotopic composition. These facts combined with the distribution of the geological units suggest that the Paleozoic subduction zone between the Yangtze and North China cratons should be located in the north boundary of the Nanwan Formation-Foziling Group or somewhere that is covered by the Nanwan Formation-Foziling Group now. From the Pb isotopic evidence and suggestion presented here, one aspect of the constraint is provided for determining the position of the Triassic collision suture between the two cratons.
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| 关 键 词： | Pb isotope tectono-stratigraphic unit tectonic affinity subduction zone Beihuaiyang |
Tectonic affinity of Paleozoic stratigraphic slices along the northern margin in Dabie Orogen, central China: evidence from Pb isotope of rocks |
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| XU Qidong,OUYANG Jianping,ZHANG Benren,KUANG Shaoping.Tectonic affinity of Paleozoic stratigraphic slices along the northern margin in Dabie Orogen, central China: evidence from Pb isotope of rocks[J].Progress in Natural Science,2002,12(6):438-444. |
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| Authors: | Xu Qidong OUYANG Jianping Zhang Benren Kuang Shaoping |
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| Institution: | 1. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2. Institute of Geochemistry, China University of Geosciences, Wuhan 430074, China |
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| Abstract: | Metavolcanic and metasedimentary rocks from the Paleozoic tectono-stratigraphic units along the northern margin in the Dabie orogen show that there are two types of Pb isotopic compositions, which have some affined regularity with tectonic subdivision. Compared with the main tectonic units of the Qinling orogen, the Dingyuan Formation should be the part of the South Qinling orogenic belt or the northern margin of the Yangtze craton, characterized by less radiogenic Pb isotopic composition, and the Guishan Formation, Nanwan Formation-Foziling Group and the Carboniferous should be the part of the North Qinling orogenic belt which is extended to the east, characterized by more radiogenic Pb isotopic composition. These facts combined with the distribution of the geological units suggest that the Paleozoic subduction zone between the Yangtze and North China cratons should be located in the north boundary of the Nanwan Formation-Foziling Group or somewhere that is covered by the Nanwan Formation-Foziling Group now. From the Pb isotopic evidence and suggestion presented here, one aspect of the constraint is provided for determining the position of the Triassic collision suture between the two cratons. |
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| Keywords: | Pb isotope tectono-stratigraphic unit tectonic affinity subduction zone Beihuaiyang |
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