Metasomatism and partial melting in a subduction complex: Catalina schist, southern California.

S. S. Sorensen, Mark D Barton

Research output: Contribution to journalArticle

91 Citations (Scopus)

Abstract

Migmatitic blocks containing leucocratic zones, veins and pods with albitic plagioclase + quartz + muscovite are found in the amphibolite unit of the Catalina schist, a subduction-zone metamorphic terrain. Field relations, mineral and bulk chemistry, phase-equilibrium along with element partitioning and fluid inclusion data, suggest that the migmatites and dykes are partial melts of variably metasomatized amphibolites at P approx 8-11 kbar and T approx 640-750oC, in the presence of low-salinity aqueous fluid. The Catalina metamorphism occurred at much shallower levels than those inferred for subduction-related magmatism and is one of multi-stage, slab-derived metasomatic contamination of the mantle in the 'hanging wall' of a subduction zone. -L.C.H.Dept. of Mineral Sciences, National Museum of Natural History, Smithsonian Institution, Washington DC 20560, USA.

Original languageEnglish (US)
Pages (from-to)115-118
Number of pages4
JournalGeology
Volume15
Issue number2
DOIs
StatePublished - 1987
Externally publishedYes

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metasomatism
schist
subduction zone
partial melting
subduction
phase equilibrium
hanging wall
mineral
amphibolite
muscovite
fluid inclusion
museum
magmatism
plagioclase
slab
metamorphism
partitioning
melt
quartz
mantle

ASJC Scopus subject areas

  • Geology

Cite this

Metasomatism and partial melting in a subduction complex : Catalina schist, southern California. / Sorensen, S. S.; Barton, Mark D.

In: Geology, Vol. 15, No. 2, 1987, p. 115-118.

Research output: Contribution to journalArticle

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