Late Paleozoic magmatism in South China:Oceanic subduction or intracontinental orogeny? |
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引用本文: | YU JinHai,LIU Qian,HU XiuMian,WANG Qin,O’REILLY Suzanne Y.Late Paleozoic magmatism in South China:Oceanic subduction or intracontinental orogeny?[J].中国科学通报(英文版),2013,58(7):788-795. |
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作者姓名: | YU JinHai LIU Qian HU XiuMian WANG Qin O’REILLY Suzanne Y |
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作者单位: | State Key Laboratory for Mineral Deposits Research,School of Earth Sciences and Engineering,Nanjing University;GEMOC ARC National Key Centre,Department of Earth and Planetary Sciences,Macquarie University |
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基金项目: | supported by the National Basic Research Program of China(2012CB416701);the National Natural Science Foundation of China(40972127);the State Key Laboratory for Mineral Deposits Research(Nanjing University)(ZZKT-201106) |
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摘 要: | A gneissic granite with an U-Pb age of 313±4 Ma was found in northeastern Fujian Province,South China.It is an S-type granite characterized by high K2O,Al2O3 and low SiO2,Na2O contents with high A/CNK ratio of 1.22 for the whole rock.Zircons with stubby morphology from the gneissic granite yield 206 Pb/238 U ages ranging from 326 to 301 Ma with a weighted average age of 313±4 Ma,and negative εHf(t) values from -8.35 to -1.74 with Hf model ages (TCDM) of 1.43 to 1.84 Ga.This S-type granite probably originated from late Paleoproterozoic crust in intracontinental orogeny.Integrated with previous results on paleogeographic reconstruction of South China,the nature of Paleozoic basins,Early Permian volcanism and U-Pb-Hf isotope of detrital zircons from the late Paleozoic to early Mesozoic sedimentary rocks,we suggest the occurrence of a late Paleozoic orogeny in the eastern Cathaysia Block,South China.This orogenic cycle includes Late Carboniferous (340-310 Ma) orogeny (compression) episode and Early Permian (287-270 Ma) post-orogenic or intraplate extension episode.Therefore,the late Paleozoic magmatism in the southeastern South China probably occurred during the intraplate orogeny rather than the arc-related process.
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关 键 词: | S-type granite zircon U-Pb age zircon Hf isotope late Paleozoic orogeny South China |
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