陕南马岭关杂岩中斜长角闪岩的矿物学特征及其对Fe-Ti矿化的启示  

Mineralogical Characteristics of the Plagioclase Amphibolites of the Malingguan Complex in Southern Shaanxi Province and Their Implications for Fe- Ti Mineralization

作　　者：黄杰[1,2] 覃小锋[1,2] 王宗起[3] 张英利[3] 杨文[1,2] 朱安汉 宋炯[1,2] 

机构地区：[1]桂林理工大学地球科学学院,广西桂林541004 [2]广西隐伏金属矿产勘查重点实验室(桂林理工大学),广西桂林541004 [3]中国地质科学院矿产资源研究所,北京100037

出　　处：《地质与勘探》2015年第5期907-922,共16页Geology and Exploration

基　　金：国家科技支撑计划项目(2006BAB01A11);广西自然科学基金项目(2013GXNSFAA019272);桂林理工大学人才引进科研启动基金项目(002401003364);中国地质调查局地质矿产调查评价项目(1212011121091)联合资助

摘　　要：陕南安康地区马岭关杂岩中分布有大量的变质基性岩（斜长角闪岩）,其Ti O2含量变化较大,在1.80%-5.95%之间,可划分为低钛与高钛两种类型。岩石学、矿物学、地球化学的详细研究表明,有利于Fe-Ti成矿的是高钛斜长角闪岩,其源岩为富Fe-Ti基性岩类。矿物化学研究表明,钛铁氧化物主要以钛铁矿形式存在,化学成分上具富锰贫镁特征,与攀西地区岩浆型钒钛磁铁矿中钛铁矿的特征明显不同,是海底基性火山活动形成的产物后又经区域变质作用改造形成的,其Fe-Ti矿化作用经历了原岩的初始富集、板块深俯冲过程中的进变质Fe-Ti矿化作用和后期退变质Fe-Ti矿化作用三个主要成矿阶段。There exist many metabasic rocks（ plagioclase amphibolites） in the Malingguan complex in the Ankang area,southern Shaanxi Province.Their Ti O2 contents are highly variable,ranging 1. 80% - 5. 95%. They can be divided into two types of high-Ti and low-Ti plagioclase amphibolites.Detailed petrological,mineralogical and geochemical studies show that Fe- Ti mineralization is favorably related to Ti-high plagioclase amphibolites. The results of electronic probe show that Fe- Ti oxides consist mostly of ilmenite with higher content of Mn O and lower Mg O,and are obviously different from that of ilmenite in the vanadium-titanium-magnetite ore deposits of the magmatic type in the Panzihua area. They formed in a marine environment that was genetically related to basic volcanism and later were subjected to regional metamorphism. The Fe- Ti mineralization of plagioclase amphibolites experienced three stages： primary Fe- Ti enrichment in protolithes of plagioclase amphibolites,Fe- Ti mineralization during prograde metamorphism of plate deep subduction and Fe- Ti mineralization during the later retrograde metamorphism.

关 键 词：马岭关杂岩 斜长角闪岩 矿物学特征 Fe-Ti矿化 陕南 

分 类 号：P578.44[天文地球—矿物学] P588.124[天文地球—地质学]