Re-Os Isotope Studies of Ultramafic Rocks and Noble Metal Ores
Re-Os Isotope Studies of Ultramafic Rocks and Noble Metal Ores
批准号:
9117684
负责人:
Richard Walker
金额:
$8.0万
依托单位国家:
美国
项目类别:
Standard Grant
财政年份:
1992
资助国家:
美国
项目状态:
已结题
起止时间:
1992-01-15 至 1994-06-30
中文摘要
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英文摘要
This project is to use negative thermal ionization mass spectrometry techniques to examine the 187Re-187Os isotope systematics of the Pechenga ferropicrites and associated Ni-Cu ores (Kola peninsula, USSR). The specific objectives of this research are: 1) to obtain information about the Os isotopic compositions of the mantle sources for these rocks, and constrain the geochemical behavior of Re and Os doing mantle melting and the subsequent crystal-liquid differentiation that produced these compositionally diverse suites, and 2) to utilize the Re-Os system as a tracer for determining the sources of noble metals contained in the Pechenga ores. Ultimately, because of the geochemical characteristics of Re and Os, the Re-Os system will provide new insights into the chemical evolution of the mantle and crust, and lead to a better understanding of noble metal ore formation.
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