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云南锡矿的分布与地质简述(图1、图2) 云南为著名的环太平洋锡矿带、马来亚一地中海锡矿带和川滇锡矿带交汇延伸的地区.环太平洋与马来亚-地中海两锡矿带齐眉,绵延万里,处于印度板块、太平洋板块和欧亚板块接壤地带的北侧,是世界上最大的锡成矿区. 本省的锡矿床和矿点共计44处,其中特大型矿床(>20万吨)3处,大型6处,中型5处,矿点21处,锡异常81处.它们成带集中产出,分布于矿带中的矿床、矿点和异 相似文献
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含锡磁铁矿-矽卡岩的地球化学特征 总被引：5，自引：0，他引：5
Geological and geochemical features of tin-bearing magnetite-skarns are reviewed in this paper together with the author‘s opinion with respect to the mechanism of transportation of tin in this environment. In addition to cassiterite, the commonest mode of occurrence of tin in nature, three other occurrences are also of interest in tin-bearing magnetite-skarns: (1) Tin is present in extremely fine eassiterite as exsolution colloform in magnetite; (2) Being Found in some tin-bearing minerals such as malayaite,stokesite,nordenskioldine,Snpaigeite,Sn-lundwigite and hulsite in a variety of skarns;(3)Occurring in a numbor of skarn minerals such as garnet,pyroxene,spinel,amphibole,epidote,wollastonite and axinite,which become tinrich as a results of the substitution of Sn^4 for Fe^3 or Ti^4 rather than for Fe^2 ,Ca^2 or Si^4 ,When Mg^2 -,Fe^2 -bearing minerals and in some eases even sulfides or other mineralizer-containing minerals replace tin-bearing,Fe^3 -,Ti^4 -skarn minerals during the late stages of skarn alteration,tin in the pre-exsiting silicates may be extracted and remobilized thus contributing to the formation of the associated tindeposits. 相似文献
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