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Titolo:
EXPERIMENTAL MODAL METASOMATISM OF A SPINEL IHERZOLITE AND THE PRODUCTION OF AMPHIBOLE-BEARING PERIDOTITE
Autore:
SEN C; DUNN T;
Indirizzi:
KARADENIZ TEKN UNIV TRABZON 61015 TURKEY UNIV NEW BRUNSWICK,DEPT GEOL FREDERICTON NB E3B 5A3 CANADA
Titolo Testata:
Contributions to Mineralogy and Petrology
fascicolo: 4, volume: 119, anno: 1995,
pagine: 422 - 432
SICI:
0010-7999(1995)119:4<422:EMMOAS>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
UPPER MANTLE BENEATH; SUBDUCTED LITHOSPHERE; ISLAND-ARC; LHERZOLITE XENOLITHS; VOLCANIC-ROCKS; NUNIVAK ISLAND; ORIGIN; ZONE; MAGMAS; SLAB;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
62
Recensione:
Indirizzi per estratti:
Citazione:
C. Sen e T. Dunn, "EXPERIMENTAL MODAL METASOMATISM OF A SPINEL IHERZOLITE AND THE PRODUCTION OF AMPHIBOLE-BEARING PERIDOTITE", Contributions to Mineralogy and Petrology, 119(4), 1995, pp. 422-432

Abstract

Experiments have been done which simulate the modal metasomatism of spinel Iherzolite by partial melts of the subducted slab. The experiments were designed so that the metasomatizing melts were generated during the experiments by partial melting of a slab analog (basaltic composition amphibolite). The melts are thought to be representative of hybridizing melts in that they are derived by high-pressure partial melting under conditions appropriate to a hot slab geotherm. During the experiments, the melts infiltrate into and metasomatize a model depleted peridotite. Chemical modifications to minerals in the peridotite are ofthe same nature and extent as those found in naturally metasomatized spinel lherzolites. Modal metasomatism produced pargasitic amphiboles in runs at 1.5 GPa and in all but the highest temperature run at 2.0 GPa. The amphiboles are indistinguishable from amphiboles found in amphibole-bearing peridotites from supra-subduction zone environments. Systematic variations in amphibole composition suggest that the melt infiltration process in the experiments involved continuous modification of the composition of the infiltrating melt as observed around inferredquenched melt (i.e., amphibolite or amphibolite/clinopyroxenite) veins in xenoliths and massif peridotites. The compositions of the initialand final mineral phases in the experiments and those of the metasomatizing melts are used to derive amphibole formation reactions at 1.5 and 2.0 GPa that are similar in form to those inferred in studies of natural amphibole-bearing peridotites. The metasomatism reactions show that the extent of amphibole formation in peridotite at 1.5 and 2.0 GPawill, in general, be limited by clinopyroxene and spinel abundance.

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Documento generato il 15/07/20 alle ore 14:57:48