内蒙古莫古吐铁锡矿床地质特征及成因类型

The geological features and genetic type of the Mogutu Fe-Sn deposit,Inner Mongolia

大兴安岭南段成矿带是中国北方重要的锡多金属成矿集中区,区内成矿地质条件优越,找矿潜力巨大。莫古吐铁锡矿床位于该成矿带南段,其产出位置及成矿地质特征与黄岗梁锡铁矿床具有可对比性,矿床的研究将有助于深化区内矽卡岩型矿床成因和成矿模式的认识。本文通过矿床基本地质特征及控矿因素研究,对莫古吐铁锡矿床成因进行初步分析,认为矿区内的地层、构造、岩浆岩等均有利于矽卡岩型矿床的形成,莫古吐岩体的侵位是主导矿床形成的重要因素,NE向构造是主要的容矿、导矿构造。岩体与围岩接触带及附近有利于成矿物质的富集,矽卡岩化作用与矿床形成关系密切,是控制矿体形态、规模及铁锡富集程度的主要因素,可作为本区寻找矽卡岩型矿床的主要标志。综合分析认为,莫古吐矿床属于典型的与酸性岩浆有关的矽卡岩型铁锡矿床。

The southern Da Hinggan Mountains metallogenic belt, which has superior ore-forming geological condition and the great ore prospecting potential, is an important tin-polymetallic metallogenic centralized region in Northern China. The Mogutu Fe-Sn deposit, located in the southern part of the metallogenic belt. The ore deposit occurring location and ore-forming geological characteristics are comparable with the Huanggang Sn-Fe deposit. The comprehensive research of the Mogutu Fe-Sn deposit will be favorable for deepening the understanding of ore genesis and metallogenic model about the skarn deposits in the huanggang-ganzhuermiao ore belt. The purpose of the papers is to analyse the origin of the mineralization by researching the geological features of ore deposit and ore control factors. The strata, structure and magmatic rock in the mining area are beneficial to the formation of skarn type deposit. The Mogutu syenogranite is proved to be the major factor in the formation of the deposit. The ore-bearing structure and ore-transmitting structure are NE-trending structure. The contact zone between syenogranite and surrounding rocks and nearby is the favorable for enrichment of mineralization. Skarnization is closely related to mineralization which is regarded as the main mark of discovering skarn type deposit which controlling the ore body's features, scale and enrichment. The results show that the Mogutu deposit is a typical skarn type Fe-Sn deposit which is related to the acidic magmas.