FURTHER STUDY OF Os/Os AND HIGHLY SIDEROPHILE ELEMENT SYSTEMATICS OF APOLLO
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چکیده
Introduction: We have continued study of the chemical nature of late accreted materials to the Earth-Moon system by examining the highly sidero-phile elements (HSE: Ru, Pd, Re, Os, Ir, Pt) contained in lunar impact-melt rocks. The HSE contained in melt rocks were largely added to the Moon during the period of time from the origin of the lunar highlands crust (4.4-4.5 Ga) to the end of the late bombardment period (~3.9 Ga). These materials provide the only direct chemical link to the late accre-tionary period. The 187 Os/
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