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引用本文:王 勤1 唐菊兴2 方 向1 林彬2 宋 扬2 王艺云1 杨欢欢1 杨 超2 李彦波3 卫鲁杰3 冯 军4 李 力4. 西藏多龙矿集区铁格隆南铜(金银)矿床荣那矿段安山岩成岩背景: 来自锆石U-Pb年代学、岩石地球化学的证据[J]. 中国地质, 2015, (5): 1324-1336.
WANG Qin1, TANG Ju-xing2, FANG Xiang1, LIN Bin2, SONG Yang2, WANG Yi-yun1, YANG Huan-huan1, YANG Chao2, LI Yan-bo3, WEI Lu-jie3, FENG Jun4, LI Li4. Petrogenetic setting of andsites in Rongna ore block, Tiegelong Cu (Au-Ag) deposit, Duolong ore concentration area, Tibet: Evidence from zircon U-Pb LA-ICP-MS dating and petrogeochemistry of andsites[J]. Geology in China, 2015, (5): 1324-1336(in Chinese with English abstract).
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西藏多龙矿集区铁格隆南铜(金银)矿床荣那矿段安山岩成岩背景: 来自锆石U-Pb年代学、岩石地球化学的证据
王 勤1 唐菊兴2 方 向1 林彬2 宋 扬2 王艺云1 杨欢欢1 杨 超2 李彦波3 卫鲁杰3 冯 军4 李 力4
作者单位
王 勤1 唐菊兴2 方 向1 林彬2 宋 扬2 王艺云1 杨欢欢1 杨 超2 李彦波3 卫鲁杰3 冯 军4 李 力4 1. 成都理工大学地球科学学院, 四川 成都 610059; 2. 中国地质科学院矿产资源研究所, 国土资源部成矿作用与资源评价重点实验室, 北京 100000; 3. 西藏地质矿产勘查开发局第五地质大队, 青海 格尔木 816000; 4. 西藏金龙矿业股份有限公司, 西藏 拉萨 851418 
摘要:
提要: 本文主要对出露与西藏多龙矿集区铁格隆南矿区荣那矿段的安山岩开展了锆石U?Pb定年、岩石地球化学测试, 旨在确定该套火山岩的成岩年龄及其形成的构造背景。安山岩的LA?ICP?MS锆石U?Pb加权平均年龄为(110.1±0.7) Ma (MSWD=2.3), 代表了其成岩年龄。岩石SiO2为59.5%~61.48%; Al2O3为16.14%~17.11%; Na2O+K2O为6.02%~6.63%; Mg#值中等, 微量元素富集Ba、Rb、Th、K等大离子亲石元素, 相对亏损Ta、Nb、P、Ti等高场强元素, 具有Rb正异常和明显的Zr、Hf负异常, 据此认为该安山岩属高钾钙碱性系列岩石, 具有活动大陆边缘火山岩的性质, 是班公湖—怒江洋北向俯冲, 拉萨地体与羌塘地体碰撞拼贴过程中所诱发的岩浆产物。结合其他资料分析认为, 此安山岩的成岩时间应晚于铁格隆南高硫型浅成低温热液铜(金)矿床的成岩和成矿时间, 是该矿床得以良好保存的重要条件。
关键词:  多龙矿集区  安山岩  锆石U?Pb定年  岩石地球化学  浅成低温热液  西藏
DOI:
分类号:
基金项目:国土资源部公益性行业科研专项项目(201511017)、国家自然科学青年基金(41402178)、青藏专项项目(12120114050401)、国家973项目(2011CB403103)及中铝西藏矿业有限公司资助项目(ZLXZ-2013-JS03)联合资助。
Petrogenetic setting of andsites in Rongna ore block, Tiegelong Cu (Au-Ag) deposit, Duolong ore concentration area, Tibet: Evidence from zircon U-Pb LA-ICP-MS dating and petrogeochemistry of andsites
WANG Qin1, TANG Ju-xing2, FANG Xiang1, LIN Bin2, SONG Yang2, WANG Yi-yun1, YANG Huan-huan1, YANG Chao2, LI Yan-bo3, WEI Lu-jie3, FENG Jun4, LI Li4
Abstract:
Abstract: In this paper, the authors studied the andsites in Rongna ore block, Tiegelong Cu (Au-Ag) deposit, Duolong ore concentration area, Tibet, and used the zircon U-Pb data and petrogeochemistry of andsites to identify the petrogenetic age and tectonic setting of the andsites. The weighted average age of zircon U-Pb is 110.1±0.7 Ma (MSWD=2.3) , which represents the petrogenesis age. An analysis of the whole rock sample shows that SiO2 values are 59.5%-61.48%, Al2O3 values are 16.14%-17.11% and Na2O+K2O values are 6.02%-6.63%; Mg# is of intermediate value. LILE such as Ba, Rb, Th, K are rich, HFSE such as Ta, Nb, P, Ti are relatively poor and characterized by Rb positive anomaly and obvious Zr, Hf negative anomalies. Petrological and geochemical studies show that the andesites are high potassium calc-alkaline rocks exhibiting the characteristics of Andean-type active continental margin volcanic rocks. They resulted probably from partial melting of subducted oceanic slab as well as miscibility with crustal material during the upward migration of the magma in the case that subducted oceanic slab didn’t interact with the mantle. They were the magma products of the northward subduction of Bangong Co-Nujiang Ocean and Lhasa and the collision collage process of Qiangtang terrane. In combination with other dating data and drilling core catalog data, the authors hold that the formation of andesites was later than the rock-forming and ore-forming stage of the Tiegelongnan high sulfur epithermal Cu (Au-Ag) deposits, which seems to have been the important condition for the preservation of the ore deposit.
Key words:  Duolong ore concentration area  andesites  zircon U-Pb dating  petrogeochemistry  epithermal deposit  Tibet