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| 河南省西峡县石门沟钼矿床流体包裹体特征和成矿时代研究 | |
| 引用本文： | 邓小华,姚军明,李晶,刘国飞.河南省西峡县石门沟钼矿床流体包裹体特征和成矿时代研究[J].岩石学报,2011,27(5):1439-1452. |
| 作者姓名： | 邓小华 姚军明 李晶 刘国飞 |
| 作者单位： | 1. 北京大学造山带与地壳演化重点实验室,北京,100871 2. 中国科学院广州地球化学研究所矿物学与成矿学重点实验室,广州,510640 3. 紫金矿业集团股份有限公司,上杭,364200 4. 河南省地质矿产勘查开发局第一地质勘查院,郑州,450000 |
| 基金项目： | 本文受国家973项目(2006CB4035008)和国家自然科学基金项目(40872067)联合资助. |
| 摘 要： | 河南西峡县石门沟钼矿床位于东秦岭北坡的二郎坪地体内,包含斑岩型和石英脉型两类独立的钼矿化,前者呈透镜状产于岩体内,后者呈脉状沿花岗岩裂隙充填。斑岩型钼矿化由花岗岩全岩矿化所致,矿物组合以钾长石-石英-辉钼矿-黄铁矿-磁铁矿-钛铁矿-金红石为标志;石英脉型钼矿化可分为3个阶段,分别以石英-黄铁矿、石英-辉钼矿-黄铁矿-黄铜矿-闪锌矿-方铅矿-辉铋矿和石英-碳酸盐为标志。斑岩型钼矿化石英中发育CO2-H2O型、NaCl-H2O型包裹体以及含子晶包裹体,石英脉型钼矿化早阶段以CO2-H2O型和NaCl-H2O型包裹体为主,中晚阶段仅见NaCl-H2O型包裹体,无矿石英脉包含CO2-H2O型和NaCl-H2O型包裹体。斑岩型钼矿化捕获了H2O-CO2-NaCl体系的初始流体,其温度集中于270~400℃,盐度为4%~13% NaCleqv,流体压力为32~155MPa,对应深度为1.1~5.4km。石英脉型钼矿化早阶段流体为H2O-CO2-NaCl体系,温度集中于240~330℃,盐度集中于2%~10% NaCleqv,压力为14~46MPa和101~153MPa,对应成矿深度3.5~4.6km;中阶段温度降为170~290℃,盐度降为2%~8% NaCleqv;晚阶段均一温度继续降至150~200℃,盐度为1%~6% NaCleqv。石英脉型钼矿化从早阶段到晚阶段,成矿流体盐度随均一温度降低而逐渐降低,指示高温、高盐度、富CO2的岩浆热液与晚阶段低温、低盐度的大气降水的混合作用,导致了钼金属的沉淀。矿区花岗岩成岩年龄为109.8±4.1Ma, 本次研究获得的6件斑岩型钼矿化辉钼矿Re-Os加权平均年龄为109.0±1.7Ma,石英脉型钼矿化辉钼矿Re-Os同位素加权平均年龄为107.1±0.6Ma,略晚于斑岩型钼矿化,与区内燕山晚期的岩浆作用近同时形成,指示成矿作用与燕山晚期的岩浆作用有关,为与侵入岩有关的钼矿床。 |
| 关 键 词： | 流体包裹体 侵入岩有关的钼矿床 东秦岭钼矿省 石门沟 |
| 收稿时间： | 2010/11/13 0:00:00 |
| 修稿时间： | 2011/3/25 0:00:00 |
Fluid inclusion and Re-Os isotopic constraints on the timing and origin of the Shimengou Mo deposit, Xixia County, Henan Province. |
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| DENG XiaoHu,YAO JunMing,LI Jing and LIU GuoFei.Fluid inclusion and Re-Os isotopic constraints on the timing and origin of the Shimengou Mo deposit, Xixia County, Henan Province.[J].Acta Petrologica Sinica,2011,27(5):1439-1452. | |
| Authors: | DENG XiaoHu YAO JunMing LI Jing and LIU GuoFei |
| Institution: | Laboratory of Orogen and Crust Evolution, Peking University, Beijing 100871, China;Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;Zijin Mining Group, Shanghang 364200, China;No.1 Geological Exploration Institute of Henan Province, Zhengzhou 450000, China |
| Abstract: | The Shimengou deposit,contains porphyry and quartz vein-type molybdenum mineralization,is mainly hosted in granitoids occurs in the Erlangping Terrane,northern East Qinling Orogen.The quartz vein-type mineralization can be divided into early,middle and late stages,characterized by assemblages of quartz-pyrite,quartz-molybdenite-polymetallic sulfide and quartz-carbonate,respectively.The samples from porphyry mineralization contain three different types of fluid inclusions,including CO2-H2O,NaCl-H2O and daugh... |
| Keywords: | Fluid inclusion Intrusion-related Mo deposit East Qinling Mo Province Shimengou |
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