峨眉大火成岩省钒钛磁铁矿矿床地质特征及成因  

Geological Features and Genesis of the V-Ti Magenetite Deposits in the Emeishan Large Igneous Province, SW China

作　　者：宋谢炎[1] 陈列锰[1] 于宋月[1] 陶琰[1] 佘宇伟 栾燕[1] 张晓琪 何海龙 SONG Xie-yan;CHEN Lie-meng;YU Song-yue;TAO Yan;SHE Yu-wei;LUAN Yan;ZHANG Xiao-qi;HE Hai-long(State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China)

机构地区：[1]中国科学院地球化学研究所矿床地球化学国家重点实验室

出　　处：《矿物岩石地球化学通报》2018年第6期1003-1018,共16页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家重点研发计划课题(2016YFC0600503);中科院战略先导专项(B类)(XDB18030200,XDB18030203)

摘　　要：峨眉大火成岩省内带的攀西地区发现了攀枝花、红格、白马、太和等超大型钒钛磁铁矿矿床,是世界上最大的钒钛磁铁矿矿集区。与世界其他类似的钒钛磁铁矿矿床不同,攀西地区的这些矿床都呈层状赋存在大型层状镁铁一超镁铁岩体的下部和中部岩相带,而不是上部岩相带。最近十多年的系统研究表明,这些矿床形成的主要机制有:①幔源岩浆在深部岩浆房发生硅酸盐矿物的分离结晶形成了富钛铁岩浆;②富钛铁岩浆进入浅部含矿岩体后,钛铁氧化物成为近液相线矿物,较早结晶并经过流动分选,使得钛铁氧化物在下部和中部岩相带聚集成矿。A series of large V-Ti magnetite deposits,such as the Panzhihua,Hongge,Baima and Taihe,have been discovered in the Panxi area,which is the largest V-Ti magnetite ore-concentrated area,in the central zone of the Emeishan LIP.Different from the analogous deposits,these deposits occur as ore layers in the lower and middle zones of the layered intrusions,rather than in the upper zone.The systematic studies in recent ten years have indicated the following dominant formation mechanism of the deposits:(1)the evolution of basaltic magma derived from the mantle through fractionation of silicate minerals in a magma chamber at deep level resulted in the formation of the Fe-Ti enriched magma;(2)when the Fe-Ti enriched magma entered into a shallower magma chamber,Fe-Ti oxides in the semi liquidus state were crystalized early and then were concentrated in the lower and middle zones of the chamber via flow sorting to have formed the deposit.

关 键 词：大火成岩省 磁铁矿 钛铁氧化物 

分 类 号：P618.2[天文地球—矿床学]