地幔岩包体中金富集规律——以中国东部地幔岩包体为例  

Studies on Enriching Law of Gold in Mantle Xenolith: a Case Study of Eastern China

作　　者：张维萍[1] 赫英[1] 岳可芬[1] 

机构地区：[1]西北大学大陆动力学国家重点实验室

出　　处：《地球科学与环境学报》2007年第2期117-119,125,共4页Journal of Earth Sciences and Environment

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

摘　　要：采集中国东部玄武岩中橄榄岩包体27件,测定了其主量元素氧化钙、贵金属金以及其中21件橄榄岩包体的铂族元素。橄榄岩包体中金与氧化钙质量分数的相关性表明,金在地幔演化初期可能主要赋存于单斜辉石中,反映地幔包体中金可能与地幔演化及熔融程度有关。饱满型或弱亏损型橄榄岩包体具有相似平坦的铂族元素球粒陨石标准化分布模式,其都对应有高的金质量分数;而强亏损型橄榄岩包体的铂族元素球粒陨石标准化分布模式呈下降趋势,且对应橄榄岩包体的金质量分数均较低。The 27 mantle xenoliths have been collected in eastern China. The content of CaO, Au and PGE of 21 peridotite xenoliths were determined. The relationship of gold with CaO for the 27-peridotite xenoliths suggests that the gold content of the xenoliths relates to partial melting degree of mantle. The peridotite xenoliths that their chondrite-normalized PGE patterns are smooth have higher golden contents. The peridotite xenoliths that their chondrite-normalized normalized PGE patterns are decline have lower gold content.

关 键 词：橄榄岩包体 氧化钙 PGE 金 部分熔融 

分 类 号：P595[天文地球—地球化学]