Compatibility of Rhenium in Garnet During Mantle Melting and Magma Genesis
- 12 June 1998
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 280 (5370) , 1737-1741
- https://doi.org/10.1126/science.280.5370.1737
Abstract
Measurements of the partitioning of rhenium (Re) between garnet and silicate liquid from 1.5 to 2.0 gigapascals and 1250° to 1350°C show that Re is compatible in garnet. Oceanic island basalts (OIBs) have lower Re contents than mid-ocean ridge basalt, because garnet-bearing residues of deeper OIB melting will retain Re. Deep-mantle garnetite or eclogite may harbor the missing Re identified in crust-mantle mass balance calculations. Oceanic crust recycled into the upper mantle at subduction zones will retain high Re/Os (osmium) ratios and become enriched in radiogenic 187Os. Recycled eclogite in a mantle source should be easily traced using Re abundances and Os isotopes.Keywords
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