| Evaluating the Provenance of Metasedimentary Rocks of the Jiangxian Group from the Zhongtiao Mountain Using Whole-Rock Geochemistry and Detrital Zircon Hf Isotope |
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| 作者姓名： | LI Qiugen CHEN Xu LIU Shuwen WANG Zongqi ZHOU Yingkui ZHANG Jian WANG Tao |
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| 作者单位： | 1 The Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, School of Earth and Space Sciences, Peking University, Beijing 100871, China; 2 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; 2 Institute of Geol;The Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, School of Earth and Space Sciences, Peking University, Beijing 100871, China;The Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; 2 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Jinzhuang Production and Construction Coal Mine of Zaozhuang City, Tengzhou 277522, China;Department of Earth Sciences, University of Waterloo, Waterloo, Ontario, Canada;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| 基金项目： | financially supported by a NSFC project (no.: 40602022), a China Postdoctoral Science Foundation Grant, a NSFC Major International Joint Research Project (no.: 40420120135), and the Ministry of Science and Technology of People’s Republic of China (no.: 2006BAB01A11 and 2002CB412608). |
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| 摘 要： | Abstract：In this study, whole-rock geochemical and Nd isotopic data, as well as detrital zircon Hf isotopes of Palaeoproterozoic metasedimentary rocks from the Jiangxian Group are presented to evaluate the characteristics of their provenance and the tectonic history. The major and trace element compositions are comparable to Post-Archean upper continental crust (PA-UCC), but have slight enrichment in the LILE, with the exception of Cs and Sr, and a slight depletion in ferromagnesian elements, HFS elements, such as Nb and Ta, and some major elements, such as CaO and Na2O. The geochemical data reveal that the collected metasedimentary rocks have experienced intermediate source weathering with chemical index of alteration values ranging from 72 to 78, varying degrees of K-metasomatism, and post-depositional loss of Na, as well as negligible sorting, and are derived from the weathering of mostly felsic and non-mafic rocks. The selected Lu–Hf isotopic analysis on detrital zircon points to both the Trans-North China Orogen and Eastern Block of the north China craton as the most likely sources for the metasedimentary rocks of the Jiangxian Group. However, a contribution of detritus from the Western Block of the north China craton can be ruled out. The sediments were probably deposited in a back-arc basin within an active continental margin setting.
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| 关 键 词： | Paleoproterozoic metasediment geochemistry provenance tectonic setting Jiangxian Group north China craton |
| 收稿时间： | 2/4/2009 12:00:00 AM |
| 修稿时间： | 2/9/2009 12:00:00 AM |
Evaluating the Provenance of Metasedimentary Rocks of the Jiangxian Group from the Zhongtiao Mountain Using Whole-Rock Geochemistry and Detrital Zircon Hf Isotope |
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| Authors: | LI Qiugen CHEN Xu LIU Shuwen WANG Zongqi ZHOU Yingkui ZHANG Jian and WANG Tao |
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| Institution: | 1 The Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, School of Earth and Space Sciences, Peking University, Beijing 100871, China; 2 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; 2 Institute of Geol;The Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, School of Earth and Space Sciences, Peking University, Beijing 100871, China;The Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; 2 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Jinzhuang Production and Construction Coal Mine of Zaozhuang City, Tengzhou 277522, China;Department of Earth Sciences, University of Waterloo, Waterloo, Ontario, Canada;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | In this study,whole-rock geochemical and Nd isotopic data,as well as detrital zircon Hf isotopes of Palaeoproterozoic metasedimentary rocks from the Jiangxian Group are presented to evaluate the characteristics of their provenance and the tectonic history.The major and trace element compositions are comparable to Post-Archean upper continental crust(PA-UCC),but have slight enrichment in the LILE,with the exception of Cs and Sr,and a slight depletion in ferromagnesian elements,HFS elements,such as Nb and Ta,and some major elements,such as CaO and Na2O.The geochemical data reveal that the collected metasedimentary rocks have experienced intermediate source weathering with chemical index of alteration values ranging from 72 to 78.varying degrees of K-metasomatism,and post-depositional loss of Na,as well as negligible sorting,and are derived from the weathering of mostly felsic and non-mafic rocks.The selected Lu-Hf isotopic analysis on detrital zircon points to both the Trans-North China Orogen and Eastern Block of the north China craton as the most likely sources for the metasedimentary rocks of the Jiangxian Group.However.a contribution of detritus from the Western Block of the north China craton can be ruled out.The sediments were probably deposited in a back-arc basin within an active continental margin setting. |
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| Keywords: | Paleoproterozoic metasediment geochemistry provenance tectonic setting Jiangxian Group north China craton |
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