| 江南隆起带中段新元古代花岗岩锆石U-Pb年代学和Hf同位素组成研究 |
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| 引用本文： | 张菲菲,王岳军,范蔚茗,张爱梅,张玉芝. 江南隆起带中段新元古代花岗岩锆石U-Pb年代学和Hf同位素组成研究[J]. 大地构造与成矿学, 2011, 35(1): 73-84 |
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| 作者姓名： | 张菲菲 王岳军 范蔚茗 张爱梅 张玉芝 |
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| 作者单位： | 张菲菲,张爱梅,张玉芝,ZHANG Feifei,ZHANG Aimei,ZHANG Yuzhi(中国科学院,广州地球化学研究所,同位素年代学和地球化学重点实验室,广东,广州,510640;中国科学院,研究生院,北京100049);王岳军,范蔚茗,WANG Yuejun,FAN Weiming(中国科学院,广州地球化学研究所,同位素年代学和地球化学重点实验室,广东,广州,510640) |
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| 基金项目： | 中国科学院知识创新项目，973项目，国家自然科学基金 |
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| 摘 要： | 对江南隆起带中段湘东西园坑岩体和赣西九岭岩体的LA-ICPMS锆石U-Pb年代学测定和LA-MC-ICPMS锆石Hf同位素原位分析测试表明:西园坑岩体形成于(804±3)Ma,赣西九岭岩体的年龄为(813±4)Ma和(823±2)Ma,均为新元古代花岗岩.上述三个样品的εHf(t)的加权平均值分别为0.68±0.71,...
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| 关 键 词： | 锆石U-Pb定年 Hf同位素 九岭岩体 西园坑岩体 新元古代 |
Zircon U-Pb Geochronology and Hf Isotopes of the Neoproterozoic Granites in the Central of Jiangnan Uplift |
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| ZHANG Feifei,WANG Yuejun,FAN Weiming,ZHANG Aimei,ZHANG Yuzhi. Zircon U-Pb Geochronology and Hf Isotopes of the Neoproterozoic Granites in the Central of Jiangnan Uplift[J]. Geotectonica et Metallogenia, 2011, 35(1): 73-84 |
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| Authors: | ZHANG Feifei WANG Yuejun FAN Weiming ZHANG Aimei ZHANG Yuzhi |
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| Affiliation: | ZHANG Feifei1,2,WANG Yuejun1,FAN Weiming1,ZHANG Aimei1,2 and ZHANG Yuzhi1,2(1.CAS Key Laboratory of Isotope Geochronology and Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China,2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China) |
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| Abstract: | This paper presents the LA-ICP-MS zircon U-Pb dating and the zircon in-situ Hf isotopic analytical results for the Neoproterozoic granites from the eastern Hunan and western Jiangxi Provinces. The dating results show that zircons separated from the Xiyuankeng and Jiuling plutons yielded the weighted mean 206Pb/238U age of (804±3)Ma,(813±4)Ma and (823±2)Ma,respectively. They have positive zircons εHf(t) values of 0.68±0.71,2.3±1.7 and 2.2±1.1,respectively. One grain with the highest positive εHf(t) value of 7.12 gives the Hf model age of 1096Ma. Considering the geochemical signatures (e.g.,high δ18O values and εHf(t) values nearing to zero) for the Jiuling intrusion and the zircon Hf isotopic composition variation for the synchronous granites in the southern Anhui and western Guangxi Provinces,it is proposed that the Neoproterozoic granites were derived from the Mesoproterozoic crustal materials with involvement of juvenile mantle component. It is inferred that the petrogenesis of the granites are related to the collapse of post-collision. |
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| Keywords: | zircon U-Pb geochronology Hf isotope Jiuling pluton Xiyuankeng pluton Neoproterozoic granites |
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