&nbsp;赣南茅坪钨矿黑钨矿及共生石英中流体包裹体组合(FIA)研究

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南京大学学报(自然科学版) ›› 2018, Vol. 54 ›› Issue (2) : 336.

赣南茅坪钨矿黑钨矿及共生石英中流体包裹体组合(FIA)研究

陈莉莉1，倪　培1*，王国光1，李文生1，杨玉龙2

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Study on the fluid inclusion assemblages(FIA)from coexisting wolframite and quartz in Maoping tungsten deposit，southern Jiangxi province

Chen Lili1，Ni Pei1*，Wang Guoguang1，Li Wensheng1，Yang Yulong2

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摘要

茅坪钨矿是赣南崇义－大余－上犹矿集区资源储量最大的矿床，主要由石英脉型矿体组成，为典型的石英脉型钨矿床. 采用当前国际流行的“流体包裹体组合”(FIA)方法，对黑钨矿及共生石英中包裹体进行了显微测温和激光拉曼探针分析. 结果表明，黑钨矿中原生包裹体均一温度普遍比共生石英高，指示了黑钨矿沉淀早于大部分共生石英，这一结论与岩相学结果一致. 石英中包裹体记录了流体的早期不混溶和晚期混合，而黑钨矿中包裹体只记录了流体的简单冷却作用. 流体的简单冷却是导致黑钨矿沉淀的主要机制. 黑钨矿中除原生包裹体外，还发育少量次生包裹体，但黑钨矿中次生包裹体比共生石英中少. 黑钨矿中次生包裹体均一温度、盐度与石英中原生包裹体均一温度、盐度相似，表明黑钨矿中次生包裹体形成于共生石英形成期间，记录了黑钨矿沉淀后的残余流体特征．

Abstract

The Maoping tungsten deposit，as one of the largest deposits in southern Jiangxi province，comprises two types of ore－bodies，i.e. wolframite－quartz vein type ore－body and greisenized－granite disseminated type ore－body. In this paper，wolframite－quartz vein type ore－body was studied using prevailing fluid inclusion assemblage(FIA)method. Microthermometry and Laser Raman spectrum analysis were conducted on fluid inclusions in coexisting quartz and wolframite，respectively. Results show that the homogenization temperatures for primary inclusions in wolframite(type Iwa)are generally higher than those in quartz(type Ia)，implying wolframite most likely formed earlier than most of the coexisting quartz. Wolframite and coexisting quartz have experienced different fluid processes in the hydrothermal system. Fluid immiscibility and fluid mixing take place in quartz but only simple cooling happens in wolframite. As infrared microthermometric studies of wolframite provide more pertinent information regarding ore formation，the principal tungsten depositional mechanism is simple cooling. Except the common presence of primary fluid inclusions in wolframite(type Iwa)，we have found some secondary fluid inclusions in wolframite(type Iwb). Type Iwb inclusions in wolframite have homogenization temperature similar to type Ia inclusions in coexisting quartz，indicating that quartz－forming fluids were preserved as post－precipitation secondary inclusions in wolframite.

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陈莉莉1，倪　培1*，王国光1，李文生1，杨玉龙2. 赣南茅坪钨矿黑钨矿及共生石英中流体包裹体组合(FIA)研究[J]. 南京大学学报(自然科学版), 2018, 54(2): 336

Chen Lili1，Ni Pei1*，Wang Guoguang1，Li Wensheng1，Yang Yulong2
. Study on the fluid inclusion assemblages(FIA)from coexisting wolframite and quartz in Maoping tungsten deposit，southern Jiangxi province[J]. Journal of Nanjing University(Natural Sciences), 2018, 54(2): 336

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