河南栾川南泥湖和上房沟花岗岩体黑云母成分特征及其成岩成矿意义  

Compositional Characteristics of Biotites from Nannihu and Shangfanggou Granites in the Luanchuan Ore Belt,Henan Province,and Its Significance for Petrogenesis and Metallogeny

作　　者：唐灿辉[1] 张寿庭[1] 张云辉[2] 曹华文[1] 唐利[1] 陈慧军[1] 许腾[1] 武宗林 

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]四川省地质工程勘察院,成都610072

出　　处：《矿物岩石地球化学通报》2015年第3期539-545,共7页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家科技支撑计划项目(2011BAB04B06);中国地质调查局项目(1212011220925);中央高校基本科研专项(2652014112)

摘　　要：河南栾川南泥湖和上房沟花岗岩体与钼多金属成矿作用密切相关。本文用电子探针测试方法,分析了南泥湖岩体和上房沟岩体中黑云母的成分特征。结果表明,2个岩体中黑云母均具有高硅、富镁、低铝和贫铁的特征,属镁质黑云母。2个岩体的结晶温度分别为730~830℃和750~860℃,氧逸度(logfO2)分别为-8.5^-7.0和-8.0^-6.5,结晶压力和深度分别为72~120MPa、54~127MPa和2.62~4.37km、1.97~4.63km,有利于南泥湖-三道庄和上房沟超大型钼矿床的形成,地球化学特征显示2个岩体均属壳幔混源的Ⅰ型花岗岩,属深源中浅成花岗岩。Nannihu and Shangfanggou granitesare closely related to mineralization of Moore fields. In this paper,we analyzed the geochemical feature of biotites from Nannihu and Shangfanggou plutons via electronmicroprobe. The analytical result showed that the biotite is characteristized by high contents of silicon and magnesium,low contents of aluminum and Fe,indicating that the biotite is belong to magnesia biotite. Crystallization temperatures of the two rocks are 730-830 ℃and 750-860 ℃,and oxygen fugacities are-8. 5-- 7. 0 and- 8. 0-- 6. 5,crystal pressures are 72- 120 MPa and 54-127 MPa,emplacement depths are 2. 62- 4. 37 km and 1. 97- 4. 63 km,respectively. Nannihu and Shangfanggou granites are of great mineralization potential. Their genetic types are granites of Ⅰ-type with crust-mantle mixed source,belonging to deep source and hypabyssal granite.

关 键 词：黑云母 花岗岩 成岩成矿作用 河南省 

分 类 号：P588.121[天文地球—岩石学] P578.959[天文地球—地质学]