辽宁弓长岭铁矿床二矿区类矽卡岩的岩石矿物学特征  

Petrological and Mineralogical Characteristics of the Skarnoid in No.2 Mining Area of the Gongchangling Iron Deposit,Liaoning,China

作　　者：刘明军[1,2] 李厚民[1] 李立兴[1] 杨秀清[1,2] 姚良德 洪学宽 陈靖[1] 

机构地区：[1]国土资源部成矿作用与资源评价重点实验室,中国地质科学院矿产资源研究所,北京100037 [2]地质过程与矿产资源国家重点实验室,中国地质大学(北京)地球科学与资源学院,北京100083 [3]辽宁省冶金地质勘查局地质勘查研究院,辽宁鞍山114002

出　　处：《岩矿测试》2012年第6期1067-1076,共10页Rock and Mineral Analysis

基　　金：国家重点基础研究发展计划(973计划)项目子课题“沉积变质型铁矿成矿环境与富矿形成机制”(2012CB416801);“我国北方沉积变质型岩浆型铁矿富矿成矿地质作用研究”项目(201111002);国土资源部公益性行业科研专项经费项目之课题“辽宁弓长岭沉积变质型铁矿科学基地研究”(200911007-15);中国地质大调查项目“辽冀地区沉积变质型铁矿控矿因素和勘查技术方法组合优选”(1212011120988)

摘　　要：辽宁弓长岭铁矿床二矿区是我国最重要的鞍山式沉积变质型富铁矿床。不同于鞍山—本溪地区其他贫铁矿床,弓长岭铁矿二矿区富铁矿体的附近分布有大量的类矽卡岩,这些类矽卡岩与富铁矿体具有密切的成因联系。本文在野外和岩相学研究的基础上,选择弓长岭二矿区类矽卡岩的岩相学、矿物学、矿物化学特征进行了研究。结果表明:类矽卡岩可分为石榴石岩、绿泥石岩、含石榴石绿泥石岩、含磁铁矿阳起石岩四种类型;类矽卡岩矿物中石榴石端员组分以铁铝榴石为主,角闪石属于钙角闪石系列中的透闪石,绿泥石属于蠕绿泥石。类矽卡岩和富铁矿是由热液交代改造磁铁贫矿形成的,二者是同一期热液活动的产物。Located in Anshan-Benxi area, the No. 2 mining area of the Gongchangling iron deposit is the most important producer of high-grade Fe ores in Anshan-type diagenetic-metamorphic banded iron formation. Unlike the widespread low-grade iron ores hosted in other banded iron formations of the Anshan-Benxi area, there is a large amount of skarnoid occurring close to the high-grade ores in the No. 2 mining area of the Gongchangling iron deposit. The high-grade ore bodies have a close genetic relationship with skarnoid. In order to investigate the mineralization of high-grade ore, this study presents the petrological and mineralogical characteristics of the skarnoid. The skarnoid was divided into four types, including garnet-rich type, chlorite-rich type, garnet chlorite-rich type and magnetite-actinolite-rich type. Electron microprobe data shows that the garnet member is dominated by almandite, the amphibole is tremolite in series with calci amphiboles and the chlorite is prochlorite. The skarnoid and high-grade ores were formed by hydrothermal interaction with low-grade ores, which were products of the same hydrothermal activity.

关 键 词：类矽卡岩 富铁矿床 矿物学特征 弓长岭 

分 类 号：P619.221[天文地球—矿床学] P597.3[天文地球—地质学]