• 责任者：Cai Minghai (College of Resources and Metallurgy ; Guangxi University ; Guangxi 530004 ; China) ; Yu Cunlin
• 刊名：Acta Geoscientica Sinica
• 出版年：2013
• 卷期：34(6)
• 关键词：锡矿 ; tin ores ; 多金属矿 ; polymetallic ores ; 流体包裹体 ; fluid inclusions ; 湖南 ; Hunan Province
• 页码：p.654-664
• 图表：3 illus., 6 tables, 20 refs.
• 分类号：1001
• issnNo：ISSN1006-3021
• isbnNo：CN11-3474/P

     The Hehuaping tin-polymetallic deposit is a large-size tin-polymetallic orefield newly discovered in southern Hunan Province. It consists of Indosinian skam-type ores and Yanshanian altered-cataclastite-type ores. Four ore bodies have been explored, which are located in the southeast portion of the Wangxianling Indosinian granite pluton and hosted in granite, granite porphyry, and Devonian limestone, dolomitite and sandstone, respectively. Based on detailed field investigation and petrographic observation, the authors carried out microthermometric studies of fluid inclusions in quartz, berylite and calcite in different types of ores. Three stages of Indosinian skarn-type ores have been distinguished, i.e., Stage Ⅰ-cassiterite and skam stage, Stage Ⅱ-sulfide stage, and Stage IIl-quartz and calcite stage. Fluid inclusions in the skarn-type ores can be divided into three types H20-NaC1 type, H20-NaC1-CO2 type, and minor pure CO2 type. Experimental results show that thehomogenization temperatures are from 290℃ to 390℃, from 190℃ to 260℃ and from 140℃ to 180℃ for Stage I, II and III, respectively. The fluid inclusions at Stage I are enriched in CO2, whereas those at the late stage （Stage Ⅱ, Stage Ⅲ） are enriched in NaC1-H2O, with minor amounts of Ca^2＋, Mg^2＋ ions. In addition, the two major stages of Yanshanian altered cataclastite-type ores have been distinguished： Stage Ⅰ-cassiterite-sulflde stage, and Stage Ⅱ-calcite stage. Yanshanian fluid inclusions can be divided into H20-NaC1 type and HzO-NaC1-CO2 type. The homogenization temperatures are from 190℃ to 340℃ and from 130℃ to 170℃ for Stage I and If, respectively. The composition of the fluid inclusions at Stage I are enriched in CO2, whereas those at Stage II are enriched in NaC1-H20. The characteristics of fluid inclusions in the Hehuaping deposit indicate that the fluid was derived from granites and groundwater. At the early stage the fluid was mainly magmatic fluid, but at later stages the fluid was dominated by groundwater. The fluid that was enriched in CO2 and the fluid that boiled at the early stage possibly led to cassiterite precipitation, and the mineralization of lead and zinc was related to NaC1-H20 fluid.