云南白马寨镍矿区煌斑岩地球化学 Ⅱ.地幔源区特征  

GEOCHEMISTRY OF LAMPROPHYRES IN BAIMAZHAI NICKEL DEPOSIT YUNNAN PROVINCEⅡ.CHARACTERISTICS OF MANTLE SOURCE REGION

作　　者：管涛[1] 黄智龙[1] 谢力华[1] 许成[1] 李文博[1] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学开放研究实验室

出　　处：《矿物学报》2004年第1期14-18,共5页Acta Mineralogica Sinica

基　　金：国家自然科学基金资助项目(批准号:49972073;40242013)

摘　　要：在总结云南白马寨镍矿区煌斑岩成因信息的基础上,利用岩石学混合计算方法对其地幔源区成分进行了模拟,进而讨论矿区这类岩石的成因。地球化学和模拟计算均表明,白马寨镍矿区煌斑岩来源于交代富集地幔,板块俯冲(印度板块向欧亚板块俯冲)过程中富含ALK、LREE及不相容元素的海底沉积物被带入地幔脱水形成的流体是引起本区地幔交代作用的主要因素。Based on the genetic information about the Baimazhai nickel deposit, Yunnan Province, we modeled the composition of the mantle source region by way of petrological mixing calculation, and further discussed the genesis of this type of rocks. Both element geochemistry data and mixing calculation showed that lamprophyres in the Baimazhai nickel deposit were derived from a metasomatism-enrichment mantle and the fluids resulted from dehydration of a subducted slab which is comprised of ALK, LREE and incompatible element-rich seafloor sediments

关 键 词：地球化学 地幔交代作用 源区成分 云南 镍矿 

分 类 号：P588.15[天文地球—岩石学] P595[天文地球—地质学]