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| 从REE和硅同位素特征探讨西藏甲马矿床层状夕卡岩成因 | |
| 引用本文： | 姚鹏,李金高,顾雪祥,郑明华,陈建坤.从REE和硅同位素特征探讨西藏甲马矿床层状夕卡岩成因[J].岩石矿物学杂志,2006,25(4):305-313. |
| 作者姓名： | 姚鹏 李金高 顾雪祥 郑明华 陈建坤 |
| 作者单位： | 1. 成都理工大学,四川,成都,610059;成都地质矿产研究所,四川,成都,610082 2. 西藏地质勘查局,西藏,拉萨,850000 3. 成都理工大学,四川,成都,610059;中国地质大学,北京,100083 4. 成都理工大学,四川,成都,610059 5. 西藏自治区政府办公厅,拉萨,850000 |
| 基金项目： | 科技部重点基础研究专项基金;国家重点实验室基金;国土资源部定向科研项目 |
| 摘 要： | 在对西藏甲马铜多金属矿床地质特征分析的基础上，对矿床中层状夕卡岩的REE及Si同位素地球化学特征进行了研究，并与典型岩浆热液接触交代夕卡岩、典型热水喷流型矿床和现代海底热流体进行对比，显示该矿床层状夕卡岩与典型岩浆热液接触交代夕卡岩存在较大差异，而与现代海底热流体和喷流型矿床及其共生的热水沉积岩有较大的相似性。因此认为，甲马矿床层状夕卡岩的形成与岩浆热液没有直接的成因联系，而与古海底热水活动有关，应属热水喷流成因。这为其共生矿床的成因提供了有力的证据。 |
| 关 键 词： | 甲马铜多金属矿床 层状夕卡岩 Si同位素 西藏 |
| 文章编号： | 1000-6524（2006）04-0305-09 |
| 收稿时间： | 2005-10-31 |
| 修稿时间： | 2005-10-312006-02-20 |
A discussion on the genesis of the stratabound skarn in the Jiama copper and polymetailic deposit of Tibet on the basis of REE and silicon isotope geochemistry |
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| YAO Peng,LI Jin-gao,GU Xue-xiang,ZHENG Ming-hu,CHEN Jian-kun.A discussion on the genesis of the stratabound skarn in the Jiama copper and polymetailic deposit of Tibet on the basis of REE and silicon isotope geochemistry[J].Acta Petrologica Et Mineralogica,2006,25(4):305-313. | |
| Authors: | YAO Peng LI Jin-gao GU Xue-xiang ZHENG Ming-hu CHEN Jian-kun |
| Institution: | 1. Chengdu University of Technokgy, Chengdu 610059, China; 2. Chengdu Institute of Geokgy and Mineral Resources, Chengdu 610082, China; 3. Xizang Bureau of Geology and Mineral Resources, Lhasa 850000, China; 4. China University of Geosciences, Beijing 100083, China; 5. General Office of the Government of Tibet Autonomous Region, Lhasa 850000, China |
| Abstract: | Located in a back-arc sedimentary basin in Gandise island-arc, the Jiama copper and polymetallic deposit occurs as stratiform and stratoid bodies in the transitional zone between the reef limestone (J-3d) and sandy slate (K-1l). Stratabound skarn is the ore-bearing rock in the Jiama deposit. With its unique geological characteristics, it has aroused great interest among investigators. Based on REE and silicon isotope characteristics of the Jiama stratabound skarn and a comparison with typical magmatic-hydrothermal contact metasomatism skarn, Sedex deposit and modern seafloor hydrothermal fluid, the authors hold that the stratabound skarn in Jiama deposit is different greatly from the typical magmatic-hydrothermal contact metasomatic skarn, but is comparable with modern seafloor hydrothermal fluid, Sedex deposit and associated hydrothermal sedimentary rock. It is thus concluded that the stratabound skarn of the Jiama deposit has nothing to do with the magmatic-hydrothermal solution, but is associated with the old seafloor hydrothermal circulatory system. It should genetically belong to hydrothermal exhalation. The study has provided valuable evidence for the origin of the Jiama copper and polymetallic deposit. |
| Keywords: | REE |
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