富Co铁锰结壳铂族元素与铼-锇同位素组成及其意义  

PGE AND Re-Os ISOTOPE COMPOSITIONS AND THEIR SIGNIFICANCES OF CO-RICH FERROMANGANESE CRUSTS

作　　者：姚德[1] 张丽洁[2] John C Wiltshire 初凤友[4] 杜安道[5] 刘心中[1] 杨富贵[1] 

机构地区：[1]山东理工大学资源与环境工程学院,淄博255049 [2]青岛海洋地质研究所,青岛266071 [3]Hawaii Undersea Research Laboratory,University of Hawaiiat Manoa [4]国家海洋局海底科学重点实验室,杭州310012 [5]国家地质实验测试中心,北京100037

出　　处：《海洋地质与第四纪地质》2002年第3期53-58,共6页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金资助项目 (4 0 0 760 15 ) ;山东省优秀中青年科学家奖励基金 ;中国大洋矿产资源研究开发协会资助项目

摘　　要：用 ICP- MS测定了太平洋富 Co铁锰结壳铂族元素和铼 -锇同位素组成。富 Co铁锰结壳不仅异常富集铂族元素 ,而且铂族元素及其它亲铁元素的配分与陨石特征非常相似。铁锰结壳的铼 -锇同位素组成明显有别于大陆地壳岩石 ,和 K- T界线沉积物相似 ,接近陨石值。世界大洋范围内的富 Co铁锰结壳均产于远离海底构造热液活动区 ,几乎不可能受到地幔源热液作用的直接影响。因此 ,富The platinum group element and Re Os isotope compositions of ferromanganese crusts from the Middle and Western Pacific were determined with ICP MS. Cobalt rich ferromanganese crusts are significantly rich in platinum group elements, and the partition of platinum group elements in cobalt rich ferromanganese crusts is very similar to that of meteorite. The Re Os isotope composition is obviously different from the rocks of the continental crust, but similar to the K T boundary sediment, and close to the meteorite. Cobalt rich ferromanganese crusts could not be influenced by mantle sourced hydrothermal process as all oceanic cobalt rich ferromanganese crusts grow on the seamounts away from seafloor hydrothermal activity sites. Therefore, it is clearly possible that extra teristitial platinum group elements exist in cobalt rich ferromanganese crusts.

关 键 词：富Co铁锰结壳 铂族元素 陨石 锇同位素 海洋矿产资源 铼同位素 钴 

分 类 号：P744.3[天文地球—海洋科学]