金在地幔矿物中的赋存形式及其赋存介质转化的可能模式:以中国北方一些地幔橄榄岩包体为例  

Occurrence of Au in mantle minerals and its possible model of transformation: Example from peridotitic xenoliths in North China

作　　者：张维萍[1,2] 赫英[1] 董振信[3] 

机构地区：[1]西北大学大陆动力学国家重点实验室,西北大学地质学系,陕西西安710069 [2]西北大学化学系,北京100812 [3]中国地质博物馆

出　　处：《地球化学》2007年第4期419-424,共6页Geochimica

基　　金：国家自然科学基金(40372052);陕西省自然科学基金(2002B07);陕西省教育厅基金(02JK063)

摘　　要：采集中国北方玄武岩中橄榄岩包体样品21件。测定了其中的主元素、微量元素、稀土元素(REE)和Au等的含量。橄榄岩包体中的Au含量与CaO含量的相关性表明,其中的Au可能主要赋存于单斜辉石中,反映Au含量可能与地幔演化及熔融程度有关;橄榄岩包体后期受地幔流体交代作用的影响,Au转而以硫化物形式存在,这一过程是在橄榄岩包体原有Au的物质基础上进行的。Twenty-one peridotite xenoliths were collected in North China several regions. Their contents of CaO, trace elements, REE and Au were determined. Relationship between gold and CaO contents for the 21 xenoliths suggests that the Au content may be related to mantle evolution and melting degree of mantle, showing that the Au may be occurred in clinopyroxen. However, the Au in peridotite xenoliths was hosted in sulfides when the xenoliths were affected by later replacement of mantle fluid. The transformation of Au from the host mineral, clinopyroxene to incorporation in sulfide was carried out on the basis of the primary Au in the peridotite xenoliths.

关 键 词：橄榄岩包体 CaO 微量元素 REE Au 硅酸盐矿物 硫化物 

分 类 号：P595[天文地球—地球化学]