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| 赣南八仙脑破碎带型钨锡多金属矿床成矿流体和年代学研究 | |
| 引用本文： | 丰成友,王松,曾载淋,张德全,李大新,佘宏全.赣南八仙脑破碎带型钨锡多金属矿床成矿流体和年代学研究[J].岩石学报,2012,28(1):52-64. |
| 作者姓名： | 丰成友 王松 曾载淋 张德全 李大新 佘宏全 |
| 作者单位： | 1. 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 2. 中煤地质工程总公司,北京,100073 3. 江西省地勘局赣南地质调查大队,赣州,341000 |
| 基金项目： | 本文受国家自然科学基金项目(40772063)、国土资源部"百人计划"项目(200809)和中国地质调查局地质调查项目(1212010561603-2)联合资助. |
| 摘 要： | 八仙脑矿床为赣南近年确认的较为典型的破碎带型钨锡多金属矿床。本文通过流体包裹体岩相学、显微测温、氢、氧同位素和年代学研究,探讨了八仙脑钨矿成矿流体来源及演化、成岩成矿时代和形成构造环境。结果表明,流体包裹体以液体包裹体为主,含少量CO2包裹体,流体具低(150～170℃和200～220℃)、中(250～270℃)和高(290～310℃)等不同的显微测温峰,显示出多期次流体活动相互叠加的特征,成矿流体为低盐度、低密度的H2O-CO2-NaCl体系。矿石中石英的δD为-78‰～-65‰,δ18OH2O为4.33‰～6.44‰,表明成矿流体以岩浆水为主并有大气降水的混合。利用SHRIMP锆石U-Pb法和辉钼矿Re-Os等时线法,分别获得八仙脑矿区成矿黑云母花岗岩和破碎蚀变带中黑钨矿-石英脉的形成年龄为157.2±2.2Ma和157.9±1.5Ma,成岩成矿年龄一致,均为晚侏罗世。结合区域最新研究成果,认为赣南钨矿形成于华南中生代岩石圈伸展时期的侏罗纪板内拉张环境的地球动力学背景,为同一成岩成矿系统的产物。 |
| 关 键 词： | 破碎带型钨矿 成矿流体 SHRIMP锆石U-Pb测年 辉钼矿Re-Os同位素测年 八仙脑 赣南 |
| 收稿时间： | 8/1/2011 12:00:00 AM |
| 修稿时间： | 2011/11/25 0:00:00 |
Fluid inclusion and chronology studies of Baxiannao mineralized fractured zone-type tungsten polymetallic deposit, southern Jiangxi Province, China |
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| FENG ChengYou,WANG Song,ZENG ZaiLin,ZHANG DeQuan,LI DaXin and SHE HongQuan.Fluid inclusion and chronology studies of Baxiannao mineralized fractured zone-type tungsten polymetallic deposit, southern Jiangxi Province, China[J].Acta Petrologica Sinica,2012,28(1):52-64. | |
| Authors: | FENG ChengYou WANG Song ZENG ZaiLin ZHANG DeQuan LI DaXin and SHE HongQuan |
| Institution: | MLR Key Labaratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;China Coal Geology Engineering Corporation, Beijing 100073, China;South Jiangxi Geological Survey Party of JBEDGMR, Ganzhou 341000, 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 |
| Abstract: | Baxiannao is a typical mineralized fractured zone-type W-Sn polymetallic deposit which was discovered recently.Based on detailed petrographic observations and microthermometric studies of fluid inclusion,hydrogen and oxygen isotopes and radiometric dating,this paper studied the origin and evolution of the ore-forming fluid,ages of tungsten mineralization and petrogenesis and tectonic environment of this deposit.The results show that the fluid inclusions are mainly of H2 O-NaCl type with minor CO2 type.The homogenization temperature peaks of low(150～170℃,200～220℃),medium(250～270℃)and high(290～310℃)indicate multistage fluid activities.The ore-forming fluid is a type of low-salinity,low-density H 2 O-CO2-NaCl system.TheδD values of fluids from fluid inclusions in quartz vary from-78‰to-65‰,δ18 O H2O values of quartz from the ore change from 4.33‰to 6.44‰, suggesting the ore-forming fluid was derived mainly from magmatic water and was mixed by meteoric water.The dating of zircon from biotite granite determined by SHRIMP yields an age of 157.2±2.2Ma.Re-Os isotopic dating of molybdenite from the Baxiannao fractured zone-type tungsten deposit by ICP-MS yield an isochron age of 157.9±1.5Ma,which is consistent with diagenetic age of biotite granite.Combined with those available from the literature,it can be concluded that tungsten mineralization occurred at the same geodynamic background that is Jurassic intraplate extensional environment during the large-scale extension period of lithosphere in southern China. |
| Keywords: | Fractured zone-type tungsten deposit Ore-forming fluid SHRIMP zircon U-Pb dating Molybdenite Re-Os isotopic dating Baxiannao Southern Jiangxi Province |
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