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Re,Os是亲铁元素,在壳-幔分异过程中,由于Os是相容元素,Re为中等不相容元素,因此Re-Os同位素体系可以提供主要由亲石元素构成的Rb-Sr,Sm-Nd和U-Th-Pb同位素体系所不能给出的重要信息。1991年Volkening等首次应用负热电离质谱(N-TIMS)分析技术进行地质样品的超低含量(10~(-9)～10~(-12))Re-Os同位素测定,揭开了Re-Os同位素体系研究的新篇章,使之成为90年代国际地球化学前沿领域的研究热点,但目前国内尚未见用N-TIMS法测定地质样品中Os同位素组成的报道。本文利用负离子热电离质谱(N-TIMS)法测定了江苏省六合县盘石山尖晶石二辉橄榄岩包体的Os同位素组成,并对其地球化学意义作了初步探讨。
Re and Os are pro-Fe elements. In the crust-mantle differentiation process, since Os is a compatible element and Re is a moderately incompatible element, the Re-Os isotope system can provide Rb-Sr , Sm-Nd and U-Th-Pb isotope system can not give important information. In 1991, Volkening and his colleagues first applied the negative thermal ionization mass spectrometry (N-TIMS) analysis technology to carry out the ultra-low content (10-9 (10-12)) Re-Os isotope determination of geological samples, Os isotope system to make a new chapter in the field of international geochemistry, making it a hot research field in the field of international geochemistry in the 1990s, but at present, there is no report about the determination of Os isotope composition in geological samples by N-TIMS method. In this paper, the Os isotopic compositions of the spinel lherzolite xenoliths from Panshi Mountain, Liuhe County, Jiangsu Province were determined by negative ion thermal ionization mass spectrometry (N-TIMS) and their geochemical implications were discussed.