中文摘要：

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。

英文摘要：

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.