| Tectonic Subdivision of Dabie Orogenic Belt,Central China：Evidence from Pb Isotope Geochemistry of Late Mesozoic Basalts |
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| 引用本文： | 匡少平,张本仁.Tectonic Subdivision of Dabie Orogenic Belt,Central China：Evidence from Pb Isotope Geochemistry of Late Mesozoic Basalts[J].中国地球化学学报,2002,21(2):147-155. |
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| 作者姓名： | 匡少平 张本仁 |
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| 作者单位： | [1]QingdaoUniversityofScienceandTechnology,Qingdao266042,China [2]InstituteofGeochemistry,ChinaUniversityofGeosciences,Wuhan430074,China |
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| 基金项目： | 国家自然科学基金，Crust-Mantle System |
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| 摘 要： |
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| 关 键 词： | 铅同位素 玄武岩 地球化学作用 铀同位素 |
Tectonic subdivision of Dabie orogenic belt, central China: Evidence from Pb isotope geochemistry of late Mesozoic basalts |
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| Kuang Shaoping,Zhang Benren.Tectonic subdivision of Dabie orogenic belt, central China: Evidence from Pb isotope geochemistry of late Mesozoic basalts[J].Chinese Journal of Geochemistry,2002,21(2):147-155. |
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| Authors: | Kuang Shaoping Zhang Benren |
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| Institution: | (1) Qingdao University of Science and Technology, 266042 Qingdao, China;(2) Institute of Geochemistry, China University of Geosciences, 430074 Wuhan, China |
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| Abstract: | It has long been debated that the Dabie orogenic belt belongs to the North China or Yangtze craton. In recent years, eastern
China has been suggested, based on the Pb isotopic compositions of Phanerozoic ore and Mesozoic granitoid K-feldspar (revealing
the crust Pb) in combination with Meso-Cenozoic basalts (revealing the mantle Pb), being divided into the North China and
Yangtze Pb isotopic provinces, where the crust and mantle of the Yangtze craton are characterized by more radiogenic Pb. In
this sense, previous researchers suggested that the pro-EW-trending Dabie crogenic belt with less radiogenic Pb in the crust
was part of the North China craton. In this paper, however, the Late Cretaceous basalts in the central and southern parts
of the Dabie orogenic belt are characterized by some more radiogenic Pb (206Pb/204Pb=17.936−18.349,207Pb/204Pb=15.500−15.688,208Pb/204Pb=38.399−38.775) and a unique U-Th-Pb trace element system similar to those of the Yangtze craton, showing that the Mesozoic
mantle is of the Yangtze type. In addition, the decoupled Pb isotopic compositions between crust and mantle were considerably
derived from their rheological inhomogeneity, implying a complicated evolution of the Dabie orogenic belt.
The study was funded by the National Natural Science Foundation of China (No. 49794043) and the Open Laboratory of Constitution,
Interaction and Dynamics of the Crust-Mantle System, China. |
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| Keywords: | Pb isotope basalt geochemical subdivision decoupled crust-mantle evolution Yangtze craton Dabie orogenic belt central China |
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