Re-Os Dating of Molybdenites from the North American Cordillera and Crustal/Mantle Contributions to Metallogenesis
Re-Os Dating of Molybdenites from the North American Cordillera and Crustal/Mantle Contributions to Metallogenesis
批准号:
9017120
负责人:
Joaquin Ruiz
金额:
$7.04万
依托单位:
依托单位国家:
美国
项目类别:
Standard Grant
财政年份:
1990
资助国家:
美国
项目状态:
已结题
起止时间:
1990-12-01 至 1993-05-31
中文摘要
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英文摘要
The are two molybdenite polytypes; a hexagonal (2H) and the more rare rhombohedral (3R). The purpose of this study is to determine which molybdenite polytype is most likely to remain closed to Re-Os exchange after deposition. The PI proposes to obtain molybdenites from different types of ore-deposits of known age, and determine the polytype by XRD analysis and analyze the Re-Os abundances by isotope dilution using an ICP-MS. The second purpose of this work is to determine the Re-Os isotope systematics of sulfides from porphyry copper/molybdenum deposits from Arizona, New Mexico, northern Mexico, Nevada and Utah in order to constrain the crust/mantle input of metals into these systems.
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依托单位:
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