Study on the Fluid Inclusions of Maoping Tungsten Deposit,Southern Jiangxi Province
Study on the Fluid Inclusions of Maoping Tungsten Deposit,Southern Jiangxi Province
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发表时间：
2011
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通讯作者：
Huo Dong-quan
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作者：
Huo Dong-quan
茅坪钨矿床是赣南新近发现的一个大型钨锡多金属矿床。它由两类矿体组成，即石英脉型和云英花岗岩型。本文对赋存于黑钨矿-石英脉中的石英和黄玉中的流体包裹体进行了研究，主要包括显微测温和激光拉曼分析。此外，在红外显微镜下测定了黑钨矿中流体包裹体的均一温度。结果表明，石英和黄玉中的流体包裹体主要为富液两相水溶液(H2O-NaCl)，含CO2三相包裹体的均一温度与上述包裹体的高温期相近，但盐度较低，均一方式不同。黑钨矿流体包裹体的均一温度和盐度最高，黄玉流体包裹体的均一温度和盐度也较高。流体包裹体的均一温度和盐度特征揭示了成矿过程的多期性和流体演化的复杂性，流体包裹体的早期沸腾作用和晚期混合作用可能是茅坪黑钨矿-石英脉型矿石的主要形成机制。
Maoping tungsten deposit is a large W-Sn-polymetallic deposit discovered recently in southern Jiangxi Province.It comprises two types of ore-bodies,i.e.quartz-vein type and greisenized-granite type.This paper studies the fluid inclusions in quartz and topaz occurring in wolframite-quartz-veins,which mainly includes microthermometry and Laser Raman analysis.Besides,the homogenization temperatures of fluid inclusions in wolframite were determined under an infra-red microscope.Results show that fluid inclusions in both quartz and topaz are mainly liquid-rich two-phase aqueous solution (H 2 O-NaCl),in addition to small amount of CO 2 -bearing three-phase aqueous solution in quartz.The homogenization temperatures from quartz show a wider range variations and can be divided into two main periods,indicating two stages of ore precipitation.The CO 2 -bearing three-phase inclusions have homogenization temperatures similar to those of the higher temperature period of the above inclusions,but lower salinities and different homogenizing ways.Fluid inclusions in wolframite have highest homogenization temperatures and salinities,whereas those in topaz also show high homogenization temperatures and salinities,and narrow variation range.The characteristics of homogenization temperatures and salinities from fluid inclusions in quartz reveal multiple-stages of ore-forming process and the complexity of fluid evolution.It is concluded from fluid inclusions that the early-stage boiling and late-stage mixing are probably the major mechanism of formation of wolframite-quartz-vein type ore in the Maoping deposit.