湘南不同类型内生钨锡矿床锡石的化学成分变化规律

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英文篇名：Chemical Constituents of Cassiterite Change Regulation of Cassiterite from Different Types Endogenous Tungsten-tin Deposit in Southern Hunan 作者：孟雨红 ; 文一卓 ; 李文朝 ; 田旭峰 英文作者：Meng yuhong;Wen yizhuo;LI wenchao;Tian xufeng;Southern Hunan institute of Geology and Survey; 关键词：湘南地区 ; 不同类型钨锡多金属矿床 ; 锡石的化学成份变化规律 英文关键词：Southern Hunan;;Different types of tungsten-tin polymetallic deposits;;The change of Chemical Composition of cassite 中文刊名：国土资源导刊 英文刊名：Land & Resources Herald 机构：湖南省湘南地质勘察院; 出版日期：2019-03-15 出版单位：国土资源导刊 年：2019 期：01 语种：中文; 页：66-74 页数：9 CN：43-1407/P ISSN：1672-5603 分类号：P618.67;P618.44

摘要

由于湘南地区不同类型钨锡多金属矿床的成矿作用、成矿溶液、成矿温度、围岩性质及围岩蚀变作用等因素有差异,因此产在不同类型钨锡多金属矿床中的锡石,除了锡石的物理性质有差异外,锡石的化学成份也有差异变化,且是有规律的。产在岩浆晚期分异交代作用生成的钠长石化锂云母化花岗岩型(含锡石)铌钽矿床及岩浆期后由热液交代作用生成的钠长石化及钠长石化云英岩化花岗岩构造蚀变带型锡矿床中的锡石,锡石主成份SnO_2的含量相对较低,平均在95%左右,个别的低至91%左右,而杂质的含量相对较高,平均在4.5%左右,个别的高至8.0%左右;产在云英岩型钨锡矿床中的锡石,锡石主成分SnO_2的含量平均在97.5%左右,杂质的平均含量在1.5%左右。产在矽卡岩(包括网脉状大理岩)型钨锡多金属矿床、石英脉型黑钨矿床及裂隙充填型锡石硫化物矿床中的锡石,锡石的主成份SnO_2的含量最高平均在99.0%左右,杂质的含量最低,一般≤1.0%。
        There are differences in mineralization, Metallogenic solution, temperature, wall rock property and wall rock alteration of different types of W-Sn polymetallic deposits in southern Hunan, Therefore, cassiterite occurs in different types of W-Sn polymetallic deposits. In addition to the physical properties of cassiterite, the chemical composition of cassiterite also varies regularly. Cassiterite occurs in albitization lithium mica granite type(cassiterite-bearing) Nb-Ta deposit formed by late magmatic differentiation and metasomatism and in albitization mica granite structural alteration zone tin deposit formed by hydrothermal metasomatism after magmatic period, The content of SnO_2, the main component of cassiterite, is relatively low,The average is about 95%, individual is low to about 91%, while the content of impurities is relatively high, average is about 4.5%, individual is high to about 8.0%; Cassiterite occurs in the wolframite-tin deposit. The content of SnO_2, the main component of cassiterite, is about 97.5% on average, and the average content of impurities is about1.5%. Cassiterite occurs in skarn(including reticulated marble) W-Sn polymetallic deposits, quartz vein wolframite deposits and fissure filling cassiterite sulfide deposits. The highest content of SnO_2 in cassiterite is about 99.0%, and the lowest content of impurities is generally less than 1.0%.

引文

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