新疆沙尔布尔海底火山喷流沉积磁铁矿床成因  

GENESIS OF SHAERBUER SEA BOTTOM VALCANIC EFFUSIVE SEDIMENTARY MEGNETTE IN XINJIANG PROVINCE

作　　者：陈大经 尹意求[1] 胡兴坪 李嘉兴 

机构地区：[1]桂林矿产地质研究院,广西桂林541004 [2]新疆有色地质706队,新疆阿勒泰836500

出　　处：《矿产与地质》2002年第5期257-261,共5页Mineral Resources and Geology

基　　金：国家科技攻关三 0五项目 96-915 -0 1-0 5专题的部分研究成果

摘　　要：沙尔布尔铁矿床形成于古岛弧区内的局部拉张环境。矿体呈似层状、透镜状、串珠状产于中志留统沙尔布尔组顶部 ,具多层产出特征 ,矿石具块状、条带状、浸染状构造。矿体附近有红碧玉 ,矿床具“底蚀特征”及底板矿化特征。磁铁矿矿石、矿物及红碧玉的稀土元素含量总量低、具负铈、负铕异常 ,属轻稀土富集型的特征。磁铁矿爆裂温度高达 370～ 4 30℃。成矿流体是以岩浆水为主 ,混有古大气水的混合流体。磁铁矿矿石中之石英的 δ30 Si与碧玉的 δ30 Si相近。Shaerbuer Iron deposit was formed in a partial tension environment of an ancient arc zone. The orebodies have been found at the top of Silurian Shaerbuer group in layer, lens and moniliform characterized by multi stratum occurrence and massive, band and disseminated ore structure. There is jasper near orebodies and the deposit is characterized by under erosion. The total REE content in magnetite ore, minerals and red jasper is low with negative cerium and europium anomalies that are light REE enrichment characters. The decrepitation temperature of magnetite is high up to 370 430℃. The main ore fluid was magma water mixed with meteoric water.δ 30 Si in quartz of magnetite ore is close to that of jasper. Therefore it is proposed that the ore is origin in sea floor effusion and sedimentation.

关 键 词：磁铁矿床 海底喷流沉积 新疆 成矿流体 稀土元素 包裹体 

分 类 号：P618.31[天文地球—矿床学]