1.State Key Laboratory for Mineral Deposits Research，Institute of Geo－Fluids，School of Earth Sciences and Engineering，Nanjing University，Nanjing，210023，China； 2.Chengdu University of Technology，School of Earth Sciences，Chengdu，610059，China
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Published
2018-03-30
Issue Date
2018-03-30
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.
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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References
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