| 贵州梵净山白云母花岗岩锆石年代、铪同位素及对华南地壳生长的制约 |
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| 引用本文： | 王敏,戴传固,王雪华,陈建书,马会珍.贵州梵净山白云母花岗岩锆石年代、铪同位素及对华南地壳生长的制约[J].地学前缘,2011,18(5):213-223. |
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| 作者姓名： | 王敏 戴传固 王雪华 陈建书 马会珍 |
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| 作者单位： | 中国地质大学(北京);贵州省地质调查院; |
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| 基金项目： | 中国地质调查局地质调查项目“贵州省地质系列图件编制与综合研究”(1212011120108);“黔北梵净山地区及黔南摩天岭地区前寒武纪古大陆演化及沉积岩相古地理研究”(1212011121106) |
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| 摘 要： | 贵州梵净山地区位于＂江南造山带＂西南段,出露地层为中新元古界梵净山群、青白口系板溪群、南华系及古生界地层。梵净山群已强烈褶皱,被青白口系板溪群角度不整合覆盖。浅色白云母花岗岩侵位于褶皱的梵净山群中;锆石原位LA-ICP-MS分析结果显示,其形成时代为（838.5±1.5）Ma。地球化学分析结果表明,其A/CNK值〉1....
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| 关 键 词： | 华南 梵净山 强过铝质花岗岩 锆石年代学 地幔柱 |
In-situ zircon geochronology and Hf isotope of muscovite-bearing leucogranites from Fanjingshan,Guizhou Province,and constraints on continental growth of the Southern China block |
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| Wang Min,Dai Chuangu,Wang Xuehua,Chen Jianshu,Ma Huizhen .China University of Geosciences,Beijing ,China .Guizhou Geological Survey,Guiyang ,China.In-situ zircon geochronology and Hf isotope of muscovite-bearing leucogranites from Fanjingshan,Guizhou Province,and constraints on continental growth of the Southern China block[J].Earth Science Frontiers,2011,18(5):213-223. |
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| Authors: | Wang Min Dai Chuangu Wang Xuehua Chen Jianshu Ma Huizhen China University of Geosciences Beijing China Guizhou Geological Survey Guiyang China |
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| Institution: | Wang Min1,2,Dai Chuangu2,Wang Xuehua2,Chen Jianshu2,Ma Huizhen2 1.China University of Geosciences(Beijing),Beijing 100083,China 2.Guizhou Geological Survey,Guiyang 550005,China |
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| Abstract: | The Fanjingshan Mountain in northeast Guizhou Province is located in the southwestern segment of the Jiangnan orogenic belt,and consists of the early Neoproterozoic,late Neoproterozoic and Paleozoic strata.The early Neoproterozoic strata were strongly folded and then intruded by numerous muscovite-bearing leucogranites.Both the folded strata and granites were unconformably covered by the Nanhua to Paleozoic strata.In-situ zircon U/Pb analyses reveal the emplacement age of 838.5±1.5 Ma for the leucogranite.Geochemical studies demonstrate that the leucogranite is strongly peraluminous with low to medium CaO/Na2O values(0.09-0.52) and high A/CNK value >1.1(1.27-1.30),suggesting that they likely have resulted from a high temperature(>875 ℃) partial melting of clay-rich psammitic rocks.The supposed super mantle plume started at ca.840 Ma may have provided extra heat for the high-temperature partial melting.In-situ zircon Hf isotope suggests two stages of continent growth before the Neoproterozoic for the South China block. |
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| Keywords: | South China Fanjingshan strongly peraluminous granite zircon geochronology mantle plume |
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