河南桐柏老湾花岗岩地球化学特征及成因研究  

Geochemical characteristics and genesis of Laowan granite in Tongbai,Henan

作　　者：马宏卫[1] 吴宏伟[1] 邱顺才[1] 王云[1] 

机构地区：[1]河南省地质调查院

出　　处：《矿产与地质》2007年第1期65-69,共5页Mineral Resources and Geology

基　　金：中国地质调查局地质大调查项目(项目编号:199710200105)资助

摘　　要：老湾花岗岩体位于老湾金矿床南侧,主要为黑云母花岗岩,对其常量元素、稀土元素、微量元素及包裹体等地球化学特征进行了研究。结果表明,岩石贫SiO2,富碱及CaO、MgO、FeO等基性组分;多数不相容元素如Li、Rb、Nb、Ta、Zr、Hf、REE等贫化;弱负Eu异常(δEu=0.6);岩石液相离子组合为K+—Na+—Cl-型;成矿元素Au富集,具备为矿床形成提供成矿物质基础。其地球化学特征总体反映,该花岗岩岩石成分偏基性、岩浆分异较弱的特点,为受地幔柱热力作用、同熔下地壳而形成的型花岗岩。Laowan granite is located at the south of Laowan gold deposits, mainly consisting of biotite granite, rich in alkaline and basic components such as CaO, MgO and FeO, but lean in SiO2 Some uncompatible elements, such as Li, Rb, Nb, Ta, Zr, Hf, REE and so on became lean, Eu shows slightly minus abnormality （δEu=0. 6）. The rocks＇ ionic component in liquid phase is K^＋-Na^＋-Cl^- type and Au is concentrated, which is the elements supply for the formation of the deposits. The geochemistry of the rock body shows that the granite rock is I type granite, kind of basic with magma differentiation undeveloped, which was formed under syntexis in lower crust melted by the heat from mantle pillar.

关 键 词：花岗岩 成因 地球化学特征 金矿床 物质来源 成矿流体 Ⅰ型花岗岩 老湾 河南 

分 类 号：P588.121[天文地球—岩石学]