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| 新疆西准噶尔地区赞岐岩（sanukite）的地球化学特征、成因机制及其与铜金矿化的关系 | |
| 引用本文： | 尹继元,袁超,孙敏,肖文交,赵国春,龙晓平,耿红燕,王步云.新疆西准噶尔地区赞岐岩（sanukite）的地球化学特征、成因机制及其与铜金矿化的关系[J].地球化学,2009,38(5):413-423. |
| 作者姓名： | 尹继元 袁超 孙敏 肖文交 赵国春 龙晓平 耿红燕 王步云 |
| 作者单位： | 1. 中国科学院,广州地球化学研究所,广东,广州,510640;中国科学院,研究生院,北京,100049 2. 中国科学院,广州地球化学研究所,广东,广州,510640 3. 香港大学,地球科学系,香港,薄扶林道 4. 中国科学院,地质与地球物理研究所,北京,100029 |
| 基金项目： | 本工作受国家973项目，国家自然科学基金基金，中国科学院国际合作伙伴计划项目以及香港RGC项目(HKU7040/04P)的联合资助 |
| 摘 要： | 西准噶尔地区广泛发育高镁质闪长质岩墙。对全岩样品的Ar-Ar测年获得了321Ma的坪年龄，显示其主要形成于石炭纪末。这些岩墙样品以富Si（SiO2 52．3％～56．9％）、Mg（Mg〉60）、Cr（134—204μg／g）、Ni（59，141μg／g）、Sr（468～724pg／g）、Ba（316～676μg／g）为特征且K／Na比值在0．38—0．63之间，类似于日本中新世Setouehi火山岩带中的赞岐岩。这些岩墙大多具有不同程度的Eu正异常并具有高的Ba／La比值（27～124），反映其主要来自消减带环境下受流体交代的地幔源区的部分熔融。赞岐岩和区内同时代埃达克质岩石的共生组合意味着该区在晚石炭世末曾受到热消减机制的影响。这种热的洋壳俯冲机制，不仅在石炭纪末期产生了大量的岩浆活动，而且也导致了铜金等成矿元素的富集。深入了解赞岐岩-埃达克岩共生组合与铜金矿化之间的密切关系将有助于正确评价区内成矿潜力。 |
| 关 键 词： | 赞岐岩 俯冲带 Ar-Ar年代学 斑岩矿化 西准噶尔 |
Sanukitic dykes in West Junggar, Xinjiang: Geochemical features,petro genesis and links to Cu-Au mineralization |
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| YIN Ji-yuan,YUAN Chao,SUN Min,XIAO Wen-jiao,ZHAO Guo-chun,LONG Xiao-ping,GENG Hong-yan,WANG Bu-yun.Sanukitic dykes in West Junggar, Xinjiang: Geochemical features,petro genesis and links to Cu-Au mineralization[J].Geochimica,2009,38(5):413-423. | |
| Authors: | YIN Ji-yuan YUAN Chao SUN Min XIAO Wen-jiao ZHAO Guo-chun LONG Xiao-ping GENG Hong-yan WANG Bu-yun |
| Institution: | YIN Ji-yuan1,2,YUAN Chao1*,SUN Min3,XIAO Wen-jiao4,ZHAO Guo-chun3,LONG Xiao-ping1,GENG Hong-yan3 and WANG Bu-yun3 1.Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China,2.Graduate University of Chinese Academy of Sciences,Beijing 100049,3.Department of Earth Sciences,The University of Hong Kong,Hong Kong,4.Institute of Geology and Geophysics,Beijing 10 0029 |
| Abstract: | High-Mg dioritic dykes widely occur in the western Junggar, Xinjiang and recorded the Late Paleozoic tectonic evolutionary history of the area. Whole-rock Ar-Ar dating on the dykes has yielded a plateau age of 321 Ma, indicating their formation at the end of the Carboniferous. The dykes are enriched in Si （SiO2 52.3% - 56.9% ）, and characterized by high Mg （Mg# 〉 60）, Cr （134 -204μg/g）, Ni （59 - 141μg/g）, Sr （468 -724 μg/g） and Ba （316 - 676 μg/g） contents, with geochemical features analogous to those of sanukite in Setouchi volcanic belt, Japan. The dykes generally display high Ba/La （27 - 124）, and positive Eu anomalies, indicating their origination from hydrous partial melting of a mantle source metasomatised by fluid. The occurrence of sanukitic dykes, together with the coeval slab-related adakite in the area, implies the western Junggar had been affected by hot, subduction-related regime, which gave rise to not only massive magmatism in the late Carboniferous, but also wide mineralization of Cu and Au. A profound, comprehensive research is required to explore the intimate relationship between the sanukite-adakite association and the potential Cu-Au mineralization in the region. |
| Keywords: | sanukite subduction Ar-Ar age Cu-Au mineralization West Junggar |
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