Osmium concentrations and 187Os/188Os ratios of three sediment reference materials
作者单位：Key Laboratory of Petroleum Resources ResearchInstitute of Geology and GeophysicsChinese Academy of Sciences Department of Earth and Planetary Systems ScienceGraduate School of ScienceHiroshima UniversityHigashi-HiroshimaHiroshima 739-8526Japan Institute for Frontier Research on Earth Evolution(IFREE)Japan Agency for Marine-Earth Science and Technology(JAMSTEC)Yokosuka 237-0061Japan Precambrian Ecosystem LaboratoryJapan Agency for Marine-Earth Science and Technology(JAMSTEC)Yokosuka 237-0061Japan Institute for Frontier Research on Earth Evolution(IFREE)Japan Agency for Marine-Earth Science and Technology(JAMSTEC)Yokosuka 237-0061Japan Center for Chronological ResearchNagoya UniversityFuro-choChikusaNagoya 464-8602Japan
会议名称：《中国科学院地质与地球物理研究所2012年度（第12届）学术年会》
会议日期：2013年
学科分类：0709[理学-地质学] 081803[工学-地质工程] 07[理学] 08[工学] 0818[工学-地质资源与地质工程]
基 金：supported by a grant-in-aid from the Japan Society for the Promotion of Science(JSPS) Japan Association for Promotion of Resource Sciences to KS
关 键 词：Os concentration Os isotope sediment reference material Geochemical Survey of Japan heterogeneous Os
摘 要：Os/Os ratios and osmium concentrations were analyzed in sedimentary reference materials JSd-3,JMS-1,and JMS-2,issued by the Geological Survey of Japan,using the isotope dilution method with negative thermal ionization mass spectrometry(ID-N-TIMS).The chemical procedures used in this study are based on Carius tube digestion combined with carbon tetrachloride extraction to separate *** obtained Os/Os ratios of JSd-3,JMS-1,and JMS-2 were 0.941- 1.149,0.3894-0.465,and 0.747-0.848,respectively,and their Os abundances were 27.07-39.32 ppt,80.8-106.6 ppt,and 281-317.2 ppt,*** among the samples presumably reflect differences in sources and depositional *** Os isotopic ratios and abundances were variable within individual *** relative 95%confidence intervals of Os concentrations and isotopic ratios were respectively 13%and 6.2%for JSd-3,15%and 9.8%for JMS-1,and 4.3%and 4.2%for *** variations probably reflect the heterogeneity of the original rock of each reference *** concentration and high isotope ratio of JSd-3 probably results from the derivation of the original rocks from continental components with low Os abundance and elevated Os/*** of anthropogenic Os were inferred in JMS-1,a nearshore sediment from an urbanized locality,which had high Os contents and relatively low Os isotopic *** elevated Os concentrations and high Os/Os in JMS-2,a pelagic clay,may reflect the scavenging of Os in seawater into Mn-Fe oxyhydroxides deposited on the seafloor.