| The Late Proterozoic Continental Accretionary History of the Southeastern Margin of Jiangnania |
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| 作者姓名： | K.A.Foland |
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| 作者单位： | Department of |
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| 摘 要： | The newly obtained Sm-Nd isochron ages are 1034 Ma and 935 Ma for ophiolites from northeasternJiangxi and Fuchuan, southern Anhui respectively. There exist two unconformity surfaces under the initialLate Proterozoic volcanics as well as the Sinian rocks. The Xiuning intrusive body which was intruded into theShangxi Group in southern Anhui yields a whole-rock Rb-Sr isochron age of 963 Ma. There occurs a belt ofLate Proterozoic calc-alkali volcanic rocks extending from northeastern Jiangxi to northwestern Zhejiang. Inthe light of the above facts, the authors consider that the southeastern margin of Jiangnania is an ancient islandarc. At about 1000 Ma ago, the Huanan (South China) oceanic crust was subducted along the line linking Dex-ing and Hangzhou, thus starting the accretion of the island arc system to Jiangnania. At 800 Ma ago Cathaysiaand Jiangnania converged together along the Jiangshan-Shaoxing line, marking the end of the accretion.
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The Late Proterozoic Continental Accretionary History of the Southeastern Margin of Jiangnania |
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| Authors: | Xing Fengming Xu Xiang Chen Jiangfeng Zhou Taixi KA Foland Institute of Geological Sciences of Anhui Province Hefei |
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| Institution: | Xing Fengming,Xu Xiang,Chen Jiangfeng,Zhou Taixi,K.A. Foland Institute of Geological Sciences of Anhui Province,Hefei,Department of Earth and Space Sciences,University of Science and Technol ogy of Chin,Hefei,Department of Geology and Mineralogy. the Ohio State University,Columbus,OH,USA Jiang Minxi |
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| Abstract: | The newly obtained Sm-Nd isochron ages are 1034 Ma and 935 Ma for ophiolites from northeasternJiangxi and Fuchuan, southern Anhui respectively. There exist two unconformity surfaces under the initialLate Proterozoic volcanics as well as the Sinian rocks. The Xiuning intrusive body which was intruded into theShangxi Group in southern Anhui yields a whole-rock Rb-Sr isochron age of 963 Ma. There occurs a belt ofLate Proterozoic calc-alkali volcanic rocks extending from northeastern Jiangxi to northwestern Zhejiang. Inthe light of the above facts, the authors consider that the southeastern margin of Jiangnania is an ancient islandarc. At about 1000 Ma ago, the Huanan (South China) oceanic crust was subducted along the line linking Dex-ing and Hangzhou, thus starting the accretion of the island arc system to Jiangnania. At 800 Ma ago Cathaysiaand Jiangnania converged together along the Jiangshan-Shaoxing line, marking the end of the accretion. |
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| Keywords: | Jiangnania Late Proterozoic continental accretion |
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