新疆准噶尔北缘托斯巴斯套铁铜金矿床矽卡岩和磁铁矿矿物学特征及其地质意义  

Mineralogical Characteristics of Skarn in Tuosibasitao Iron-Copper-Gold Deposits of the Northern Margin of Junggar,Xinjiang,and Their Geological Significance

作　　者：吕书君[1,2] 杨富全[3] 柴凤梅[4] 张志欣[5] 李强[3] 

机构地区：[1]湖南省地质矿产勘查开发局407队,湖南怀化418000 [2]中国地质大学(北京)地球科学与资源学院,北京100083 [3]中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点实验室,北京100037 [4]新疆大学地质与矿业工程学院,新疆中亚造山带大陆动力学与成矿预测实验室,新疆乌鲁木齐830049 [5]中国科学院新疆生态与地理研究所新疆矿产资源研究中心,新疆乌鲁木齐830011

出　　处：《岩矿测试》2013年第3期510-521,共12页Rock and Mineral Analysis

基　　金：国土资源部公益性行业科研专项经费(201211073);国家科技支撑计划项目(2011BAB06B03-02;2006BAB07B02-01);国家自然科学基金项目(40972069)

摘　　要：托斯巴斯套铁铜金矿床赋存于中泥盆统北塔山组火山岩与闪长(玢)岩的接触带中,矿体呈脉状、透镜状,矿体及其周围发育大量矽卡岩。本文分别利用电子探针、电感耦合等离子体质谱法(ICP-MS),对托斯巴斯套铁铜金矿附近的石榴子石、辉石、绿帘石的化学组分及磁铁矿的主量及微量元素开展研究。结果表明:矽卡岩矿物中石榴子石端员组分以钙铝榴石-钙铁榴石系列为主,辉石端员组分以透辉石为主,绿帘石化学成分富铁富钙,这些特点表明矿区矽卡岩具有钙矽卡岩特征。矽卡岩是由岩浆热液流体交代北塔山组基性火山岩而形成的,磁铁矿的形成与矽卡岩的退化变质作用有关。在石英-硫化物-碳酸盐阶段形成铜和金矿化。The Tuosibasitao Fe-Cu-Au mineral deposit mainly occurs in the contact zone between the diorite porphyrite and basaltic volcanic rock of Middle Devonian Beitashan Formation in the forms of massives, heterogeneous gobbets, veinlets, breccia and veinlet-disseminated. The ore bodies in the ore deposit occur as stratoids or lenses, surrounded by skarn. The major and trace elements in magnetite, and chemical components in garnet, chinopyoxene and epidote from Tuosibasitao deposit were studied by Inductively Coupled Plasma-Mass Spectrometry （ICP-MS） and Electron microprobe analyse. The results demonstrate that the end member of garnet is mainly grossularite and andradite. The composition of pyroxene was mainly diopside, with a small amount of augite. The epidote was enriched in Fe and Ca. The composition of these skarn minerals suggest that skarn in Tuosibasitao ore deposit is calcic skarn. In combination with the geological characteristics, it is possible that the skarns are formed by hydrothermal interaction with metamorphic volcanic, and the formation of magnetite is related to the retrogressive metamorphism of the skarn. Copper and gold mineralization occurred during the quartz-sulphide- carbonate period.

关 键 词：托斯巴斯套 准噶尔北缘 铁铜金矿床 矽卡岩 磁铁矿 电子探针分析 

分 类 号：P612[天文地球—矿床学] P588.312[天文地球—地质学]