| 四川阿坝州党坝伟晶岩型锂辉石矿床流体包裹体特征及地质意义 |
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| 引用本文： | 季根源,江思宏,夏浩东,冯雨周,张洪平.四川阿坝州党坝伟晶岩型锂辉石矿床流体包裹体特征及地质意义[J].地质找矿论丛,2020,35(1):33-41. |
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| 作者姓名： | 季根源 江思宏 夏浩东 冯雨周 张洪平 |
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| 作者单位： | 中国地质科学院矿产资源研究所, 北京 100037;自然资源实物地质资料中心, 河北 廊坊 065201,中国地质科学院矿产资源研究所, 北京 100037,自然资源实物地质资料中心, 河北 廊坊 065201,中国科学院广州地球化学研究所, 广州 510640,四川省地质矿产勘查开发局化探队, 四川 德阳 618000 |
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| 基金项目： | 中国地质调查局项目DD20190411和DD20160051共同资助。 |
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| 摘 要： | 四川省阿坝州党坝伟晶岩型锂辉石矿床是可尔因稀有金属矿集区内的典型矿床。通过对党坝锂辉石矿物流体包裹体研究结果表明:1)锂辉石矿物中富集气液两相水溶液包裹体、含CO2三相包裹体,见少量含子矿物三相包裹体;流体包裹体均一温度为260℃-314℃,盐度为w(NaCl,eqv)=2.96%~9.08%,指示党坝矿床成矿流体具中温、低盐度特征。2)激光拉曼光谱分析气相成分主要为H2O,CO2次之,见少量的CH4、N2;液相成分以H2O为主,含少量CO2、CH4;含子矿物包裹体的子晶矿物为方解石。3)成矿流体应属H2O-NaCl±CO2±CaCl2±CH4±N2体系,流体密度为0.72~0.88g/cm3,认为在成矿流体主要来源于岩浆热液。4)气液两相水溶液包裹体、含CO2三相包裹体以及含子矿物三相包裹体共存于同一视域中,且均一温度相近,表明流体发生沸腾或不混溶作用导致相分离并发生锂辉石聚集沉淀是党坝锂辉石矿床形成的主要原因。
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| 关 键 词： | 党坝锂辉石矿 伟晶岩型锂辉石矿床 流体包裹体 可尔因矿集区 四川省 |
| 收稿时间： | 2019/7/31 0:00:00 |
Characteristics and geological significance of fluid inclusions in Dangba pegmatite spodumene deposit in Aba Prefecture, Sichuan province |
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| JI Genyuan,JIANG Sihong,XIA Haodong,FENG Yuzhou and ZHANG Hongping.Characteristics and geological significance of fluid inclusions in Dangba pegmatite spodumene deposit in Aba Prefecture, Sichuan province[J].Contributions to Geology and Mineral Resources Research,2020,35(1):33-41. |
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| Authors: | JI Genyuan JIANG Sihong XIA Haodong FENG Yuzhou and ZHANG Hongping |
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| Institution: | Institute of Mineral Resources, CAGS, Beijing 100037, China;Cores and Samples Center of Natural and Resources, Langfang 065201, Hebei, China,Institute of Mineral Resources, CAGS, Beijing 100037, China,Cores and Samples Center of Natural and Resources, Langfang 065201, Hebei, China,Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China and Geochemistry Exploration Brigade of Sichuan Bureau of Exploration and Development of Geology and Minerals Resources, Deyang 618000, Sichua, China |
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| Abstract: | Dangba pegmatite spodumene deposit is typical one in the Ke’eryin pegmatite rare metal ore deposit-clustered area.Study on fluid inclusions in spodumene suggests that fluid inclusions here include mainly the two-phased vapor-liquid water inclusion and then the three-phased vapor-liquid-CO2 inclusion.The daughter mineral-bearing three-phased inclusion is rare.Temperature test shows that homogenization temperature varies from 260℃to 314℃ and salinity fromw(NaCl,eqv)=2.96% to 9.08% which is characteristic of medium temperature and low salinity of the deposit.Laser Raman analysis indicates that the gas phase is composed of mainly H2O then CO2 and rare CH4 and N2;the liquid phase mainly H2O and less CO2 and CH4;the daughter mineral calcite.The ore fluid is defined to H2O-NaCl±CO2±CaCl2±CH4±N2 system with density of 0.72 g/cm3 to 0.88 g/cm3.We think that it is derived from magmatic hydrothermal fluid.The two-phased Vapor-liquid aqueous inclusions,CO2-bearing three-phased inclusions and daughter mineral bearing three-phasd inclusions are coexistent and their homogeneous temperatures are approximate.It is suggested that the ore fluid underwent boiling,and immiscibility and resulted in phase separation and rapid precipitation of spodumene,which could be the main cause of formation of Dangba deposit. |
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| Keywords: | Dangba lithium pyroxene mine pegmatite spodumene deposit fluid inclusion Ke’eryin ore deposit-clusted area Sichuan province |
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