| 大别山鲁家寨花岗岩地球化学、锆石年代学和Hf同位素特征:扬子克拉通北东缘新元古代岩浆活动证据 |
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| 引用本文： | 孙洋,马昌前,张超.大别山鲁家寨花岗岩地球化学、锆石年代学和Hf同位素特征:扬子克拉通北东缘新元古代岩浆活动证据[J].地学前缘,2011,18(2):85-99. |
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| 作者姓名： | 孙洋 马昌前 张超 |
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| 作者单位： | 孙洋,Sun Yang(中国地质大学(武汉)地球科学学院,湖北,武汉,430074);马昌前,Ma Changqian(中国地质大学(武汉)地球科学学院,湖北,武汉,430074;中国地质大学,地质过程与矿产资源围家重点实验室,湖北,武汉,430074);张超,Zhang Chao(中国地质大学(武汉)地球科学学院,湖北,武汉,430074;汉诺威大学,矿物学系,德国,汉诺威,D-30167) |
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| 基金项目： | 科学技术部国际科技合作与交流专项，国家自然科学基金重点项目，教育部和国家外国专家局高等学校学科创新引智计划，湖北省自然科学基金重点项目 |
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| 摘 要： | 对大别山造山带的鲁家寨花岗岩进行了锆石U-Pb年代学、锆石Hf同位素和岩石地球化学研究.锆石LA-ICP-MS U-Pb定年结果表明鲁家寨花岗岩形成于新元古代((816±17)Ma).鲁家寨花岗岩总体具有高硅(SiO2 69.13%～75.47%)、准铝-弱过铝(A/CNK=0.98～1.01)的化学组成特征.稀土元素...
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| 关 键 词： | 鲁家寨花岗岩 锆石U-Pb年龄 锆石Hf同位素 大别造山带 新元古代岩浆活动 |
Geochemistry, zircon geochronology and Hf isotopes of Lujiazhai granites from the Dabie Orogen: Evidence for the Neoproterozoic magmatism along the northeastern margin of Yangtze Block |
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| Sun Yang,Ma Changqian,Zhang Chao.Geochemistry, zircon geochronology and Hf isotopes of Lujiazhai granites from the Dabie Orogen: Evidence for the Neoproterozoic magmatism along the northeastern margin of Yangtze Block[J].Earth Science Frontiers,2011,18(2):85-99. |
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| Authors: | Sun Yang Ma Changqian Zhang Chao |
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| Institution: | 1,3 1.Faculty of Earth Sciences,China University of Geosciences(Wuhan),Wuhan 430074,China 2.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China 3.Institut für Mineralogie,Leibniz Universitt Hannover,D-30167 Hannover,Germany |
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| Abstract: | The Lujiazhai granitic pluton located in the southern Dabie Orogen was studied by zircon LA-ICP-MS U-Pb dating,zircon Hf isotope and bulk geochemistry analyses.LA-ICP-MS zircon U-Pb dating gave the age of 816±17 Ma for the Lujiazhai granites,revealing that the pluton was emplaced in the Neoproterozoic.All bulk samples are high in SiO2(69.13%—75.47%),with moderate A/CNK values(0.98—1.01,averaged at 1.0),inferring an I-type granite affinity.The concentration of total rare earth elements(REEs) varies in the range of 27.43×10-6 to 160.66×10-6.The Lujiazhai granites are characterized by an enriched LREE pattern with slightly negative to positive Eu anomalies.They are enriched in large ion lithophile elements(e.g.K,Ba,Sr),but depleted in high field strength elements(e.g.P,Nb,Ti).Zircon Hf isotopic data indicate that the Lujiazhai Neoproterozoic granitic pluton in the southern Dabie Orogen was likely formed by magmas derived from partial melting of Early Precambrian metamorphic complex,accompanied by the heating and possible assimilation of mantle-derived magmas.By combining studies of the paleogeographic reconstruction of the Rodinia supercontinent,we propose that since the early Neoproterozoic,the northeastern margin of the Yangtze block might have been under an active continental margin setting induced by subduction of an oceanic plate.In this tectonic regime,the Lujiazhai granites were derived by partial melting of ancient crustal materials induced by the underplating or intracrustal heating of hot mantle-derived magmas.After the cease of subduction and consequent continent-arc collision,this area was then likely dominated by post-collisional extension or rifting tectonically,related to the break-up of the Rodinia supercontinent. |
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| Keywords: | Lujiazhai pluton zircon U-Pb age zircon Hf isotopes Dabie Orogen Neoproterozoic magmatism |
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