新疆蒙库铁矿床矽卡岩矿物学特征及其意义  

Skarn mineral characteristics of Mengku iron deposit in Xinjiang and their geological significance

作　　者：徐林刚[1] 毛景文[1] 杨富全[2] 叶会寿[2] 郑建民[1] 李建国 蔡永彪 查小玲 高建京[1] 

机构地区：[1]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [2]中国地质科学院矿产资源研究所,北京100037 [3]新疆地质矿产勘探开发局第四地质大队,新疆阿尔泰836500

出　　处：《矿床地质》2007年第4期455-463,共9页Mineral Deposits

基　　金：国家自然科学基金项目(40672065);国家科技计划项目(2006BAB07B02-01);国土资源大调查项目(1212010561506)的资助

摘　　要：蒙库铁矿床是一个以下泥盆统斜长角闪变粒岩(原岩为火山岩)为围岩的大型矽卡岩型矿床,矽卡岩矿物组合为辉石、石榴子石和方柱石,退化蚀变岩的组成矿物为角闪石、绿帘石、绿泥石、磷灰石等。电子探针分析结果表明,矽卡岩矿物中单斜辉石以透辉石为主,仅存在少量普通辉石;石榴子石端员组分以钙铁榴石为主,伴以少量钙铝榴石和锰铝榴石;角闪石属于单斜角闪石中的阳起石。蒙库铁矿床的矽卡岩与正常的矽卡岩矿床形成方式不同,不是中酸性岩浆与碳酸盐地层接触交代的产物,而是由热流体沿裂隙交代火山变质岩形成的。The Mengku iron deposit is a large skarn deposit hosted by Lower Devonian skarnized plagio-arnphibole metadolerite （originally volcanic rock）. Its skarn mineral assemblage consists of pyroxene, garnet and amphibole, and its retrograde minerals include chlorite, epidote, apatite, seapolite etc. Electron microprobe analyses show that the clinopyroxene comprises mainly diopside, with minor augite in skarn. The end member of garnet is dominated by andradite, with minor grossular and spessartine. The amphibole in the Mengku iron deposit is actinolite belonging to ferro-edenite. Although skarn in the Mengku iron deposit might have resulted from hydrothermal interaction with the meta-volcanic rock, the characteristics of skarn minerals such as the evolution process and the geochemical component are similar to things of nomal skarn.

关 键 词：地质学 矽卡岩 磁铁矿 电子探针分析 蒙库 新疆 

分 类 号：P618.31[天文地球—矿床学]