| 青海都兰县下得波利铜钼矿区锆石U-Pb测年及流体包裹体研究 |
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| 引用本文： | 刘建楠,丰成友,亓锋,李国臣,马圣钞,肖晔.青海都兰县下得波利铜钼矿区锆石U-Pb测年及流体包裹体研究[J].岩石学报,2012,28(2):679-690. |
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| 作者姓名： | 刘建楠 丰成友 亓锋 李国臣 马圣钞 肖晔 |
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| 作者单位： | 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,北京100037 |
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| 基金项目： | 本文受国家自然科学基金重点项目(41030421)和面上项目(41172076)、国土资源部"百人计划"项目(200809)及中国地质调查局地质调查项目(1212011085528、1212011120135、1212011121089)联合资助. |
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| 摘 要： | 下得波利铜钼矿为近年新发现的斑岩型矿床,位于青海省昆南构造带。本文在详细调查矿区地质特征基础上,开展了花岗斑岩的年代学、岩石地球化学以及矿床流体包裹体研究。结果表明,下得波利矿区花岗斑岩的锆石SIMSU-Pb年龄为244.2±2.1Ma;成矿斑岩为钙碱性系列,具高硅(SiO2=72.00%～74.92%)、富铝(Al2O3=13.60%～14.52%)、低钾(K2O=1.86%～1.72%),富集轻稀土元素((La/Yb)N=11.83～5.64)和大离子亲石元素(LILE),亏损高场强元素(HFSE)等特征;流体包裹体的主要类型有富液相包裹体、富气相包裹体和含子矿物包裹体,与成矿作用密切相关的流体包裹体均一温度主要集中在250～310℃之间,盐度介于2.77%～32.27%NaCleqv,认为成矿流体不混溶作用所引起的富含挥发份物质的流体分离,是造成流体物理化学条件改变和金属元素淀积成矿的主要因素。
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| 关 键 词： | SIMS锆石U-Pb测年 岩石地球化学 流体包裹体 构造环境 下得波利 东昆仑 |
| 收稿时间： | 2011/10/22 0:00:00 |
| 修稿时间： | 2012/1/12 0:00:00 |
SIMS zircon U-Pb dating and fluid inclusion studies of Xiadeboli Cu-Mo ore district in Dulan County, Qinghai Province, China |
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| LIU JianNan,FENG ChengYou,QI Feng,LI GuoChen,MA ShengChao and XIAO Ye.SIMS zircon U-Pb dating and fluid inclusion studies of Xiadeboli Cu-Mo ore district in Dulan County, Qinghai Province, China[J].Acta Petrologica Sinica,2012,28(2):679-690. |
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| Authors: | LIU JianNan FENG ChengYou QI Feng LI GuoChen MA ShengChao and XIAO Ye |
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| Institution: | MLR Key Labaratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;MLR Key Labaratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;MLR Key Labaratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;MLR Key Labaratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;MLR Key Labaratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;MLR Key Labaratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China |
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| Abstract: | The Xiadeboli Cu-Mo deposit is a newly discovered porphyry deposit in the southern of Eastern Kunlun tectonic belt,Qinghai Province.We will describe the basic geological futures of the deposit in this paper and study the geochronology,geochemistry character of the porphyry granite and the fluid character of the deposits.The results of zircon SIMS U-Pb of the granite porphyry in Xiadeboli ore district indicate an age of 244.2±2.1Ma.The porphyry granite is characterized by high SiO2(72.00%～74.92%) 、Al2O3(13.60%～14.52%) and low K2O(1.86%～1.72%) contents,belonging to the clac-alkaline series,while the trace elements of the porphyry granite show LREE((La/Yb) N=11.83～5.64) enrichment,LILE enrichment and HFSE depletion.The main type of the fluid inclusions in the quartz is liquid fluid inclusion while there are also some daughter salt-bearing inclusions and vapor-riched inclusions.The homogenization temperature of fluid inclusions in quartz related to mineralization ranges from 250～310℃ while salinity ranges from 2.77%～32.27% NaCleqv.There are several reasons for the precipitation in Xiadeboli district,but the most important one among which may be the change of the chemistry/physical condition caused by fugacity gas escaping from the parent fluid during the process of the fluid immiscible. |
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| Keywords: | SIMS zircon U-Pb age Petrochemistry Fluid inclusion Tectonic setting Xiadeboli Eastern Kunlun |
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