Mafic deep crustal and shallow upper mantle xenoliths hosted in the Chino Valley and Camp Creek latites of central Arizona have 187Os/188Os (0.216 to 1.51) ratios dramatically higher than values typical of mantle peridotite (87Sr/86Sr, low 143Nd/144Nd melts of Proterozoic lithospheric mantle. These data demonstrate the utility of the Re-Os sytem in defining mantle separation ages, or the initial time of melt extraction from a peridotitic mantle, even in cases where the lithospheric mantle is remelted long after its formation.
机构:
Univ Sci & Technol China, CAS Key Lab Crust Mantle Mat & Environm, Sch Earth & Space Sci, Hefei 230026, Peoples R China
NW Univ Xian, State Key Lab Continental Dynam, Xian 710069, Peoples R ChinaUniv Sci & Technol China, CAS Key Lab Crust Mantle Mat & Environm, Sch Earth & Space Sci, Hefei 230026, Peoples R China
Jiang Lin
Zhi XiaChen
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Univ Sci & Technol China, CAS Key Lab Crust Mantle Mat & Environm, Sch Earth & Space Sci, Hefei 230026, Peoples R ChinaUniv Sci & Technol China, CAS Key Lab Crust Mantle Mat & Environm, Sch Earth & Space Sci, Hefei 230026, Peoples R China