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| 川西新元古代花岗质杂岩体的锆石SHRIMP U-Pb年龄、元素和Nd-Sr同位素地球化学研究:岩石成因与构造意义 | |
| 引用本文： | 郭春丽,王登红,陈毓川,赵支刚,王彦斌,付小方,傅德明.川西新元古代花岗质杂岩体的锆石SHRIMP U-Pb年龄、元素和Nd-Sr同位素地球化学研究:岩石成因与构造意义[J].岩石学报,2007,23(10):2457-2470. |
| 作者姓名： | 郭春丽 王登红 陈毓川 赵支刚 王彦斌 付小方 傅德明 |
| 作者单位： | 1. 中国地质科学院矿产资源研究所,北京,100037 2. 中国地质科学院,北京,100037 3. 四川省地勘局攀西地质大队,西昌,615000 4. 中国地质科学院地质所,北京,100037 5. 四川省地质矿产局科学研究所,成都,610081 6. 四川三洲矿业有限责任公司,成都,610017 |
| 基金项目： | 国家科技攻关项目;中国地质调查局地质调查项目;国土资源部百名优秀青年科技人才计划;地质大调查项目 |
| 摘 要： | 扬子块体西缘新元古代岩浆活动十分强烈,其成因对于研究Rodinia超大陆的演化有重要意义.目前对这些岩浆的成因和形成的构造背景存在地幔柱和岛弧两种不同的观点.本文对川西康滇裂谷中四川西昌一带出露的摩挲营花岗岩体和性质相似的周边花岗质小岩体,以及岩体中出露的基性岩墙进行了SHRIMP锆石U-Pb年龄、元素和Sr-Nd同位素的研究表明:这些酸性、基性岩体形成于842～790Ma,基本为同时代的侵入岩;花岗岩基中普遍发育中性包体,为岩浆混合作用的表现;花岗岩起源于古老的下地壳,基性岩起源于亏损的软流圈地幔.本文的研究结果支持华南位于澳大利亚和Laurentia大陆之间的Rodinia超大陆重建模式. |
| 关 键 词： | 新元古代 花岗质岩石 基性岩墙和包体 锆石SHRIMP Sm-Nd同位素 华南 |
| 文章编号： | 1000-0569/2007/023(10)-2457-70 |
| 修稿时间： | 2007年6月21日 |
SHRIMP U-Pb zircon ages and major element, trace element and Nd-Sr isotope geochemical studies of a Neoproterozoic granitic complex in western Sichuan:Petrogenesis and tectonic significance |
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| GUO ChunLi,WANG DengHong,CHEN YuChuan,ZHAO ZhiGag,WANG YanBin,FU XiaoFang,FU DeMing.SHRIMP U-Pb zircon ages and major element, trace element and Nd-Sr isotope geochemical studies of a Neoproterozoic granitic complex in western Sichuan:Petrogenesis and tectonic significance[J].Acta Petrologica Sinica,2007,23(10):2457-2470. | |
| Authors: | GUO ChunLi WANG DengHong CHEN YuChuan ZHAO ZhiGag WANG YanBin FU XiaoFang FU DeMing |
| Abstract: | Neoproterozoic magmatism was very intense at the western margin of the Yangtze block.The origin of the magmas has great significance for the study of the evolution of the supercontinent Rodinia.At present,there are two divergent views as to the interpretation of the origin and tectonic setting of the magmas:the mantle plume origin and island arc origin.The authors performed SHRIMP U-Pb zircon dating and major element and trace element and Sr-Nd isotope studies of the Mosuoying granitic complex and its surrounding small granitic intrusions as well as basic dikes in these intrusions exposed in the Xichang area,Sichuan,in the Sichuan-Xikang-Yunnan rift. These studies indicate that:(1)these acid and basic rock bodies all formed at 842 ~ 790 Ma and are in the main contemporaneous intrusions;(2)intermediate enclaves are pervasive in the granite batholith is the manifestation of magma mingling;and(3)granite was derived from the older lower crust,while basic rocks were derived from the depleted asthenospheric mantle.This study supports the view that South China was located in the supercontinent Redinia between the continents Australia and Laurentia in the Neoproterozoic. |
| Keywords: | Neoproterozoic Granitic complex Basaltic dike and enclave SHRIMP U-Pb zircon dating Sr-Nd isotopes South China |
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