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Compatibility of Rhenium in Garnet During Mantle Melting and Magma Genesis

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Science  12 Jun 1998:
Vol. 280, Issue 5370, pp. 1737-1741
DOI: 10.1126/science.280.5370.1737

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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.

  • * To whom correspondence should be addressed. E-mail: righter{at}lpl.arizona.edu

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