龙首山几个镁铁—超镁铁质岩体比较  

COMPARISON OF SEVERAL MAFIC-ULTRAMAFIC INTRUSIONS IN THE LONGSHOUSHAN MOUNTAIN

作　　者：焦建刚[1] 闫海卿[1] 刘瑞平[2] 

机构地区：[1]长安大学地球科学与国土资源学院,西安710054 [2]西安地质矿产研究所,西安710054

出　　处：《地质与勘探》2006年第5期60-65,共6页Geology and Exploration

基　　金：中国地调局项目(编号:200110200058);长安大学校内基金项目(编号:0305-1001)联合资助。

摘　　要：文章选择龙首山隆起区金川、塔马子沟、毛草泉、小口子、藏布台几个镁铁—超镁铁质岩体进行地质、地球化学比较研究，发现岩体普遍具有橄榄石堆晶特征，中段金川岩体以二辉橄榄岩为主要特征，外围岩体以单辉橄榄岩为特征。地球化学数据显示，这些镁铁—超镁铁质岩体处于相同的岩石系列，源区具有相似性，岩体含矿差异主要源自岩浆演化。结合地质综合场模型，提出金川外围岩体在龙首山隆起区，沿构造带东西长约80—100km范围存在金川深部岩浆房响应的产物。Several mafic - ultramafic intrusions in Longshoushan Mountain are selected to compare their geology and geochemistry. The results show that accumulation of olivine is common in the intrusions. Intrusions in the middle parts of Longshoushan Mountain are charactefistie with lherzolite, the periphery of the intrusions are characteristic with clinopyroxene. Geochemical data prove that all intrusions helong to the same petrochemical series, the intrusions＇ differentiation mainly come from magmatic evolution. Combining with geology comprehensive field theory, it is pointed that periphery of the Jinchuan intrusive is located in the dome of Longshoushan Mountain, and there exists a responding production of Jinchuan deep magma chamber with 80 to 100km long in the E - W trending structure zone.

关 键 词：镁铁—超镁铁质岩体 地球化学 地质综合场 龙首山 

分 类 号：P618.46[天文地球—矿床学] P618.31[天文地球—地质学]