Silicic glasses trapped in peridotite xenoliths: an insight into melting and metasomatism processes in mantle peridotite
نویسندگان
چکیده
منابع مشابه
Metasomatism and Partial Melting in Upper-Mantle Peridotite Xenoliths from the Lashaine Volcano, Northern Tanzania
REE (LREE) into the glass with respect to clinopyroxene, but the A group of chrome-spinel peridotite upper-mantle xenoliths from the reverse for Sr and Y, in both mica-bearing and mica-free parageneses. Lashaine volcano, northern Tanzania, differs from other xenoliths In a mica-bearing melt pocket, Rb and Ba partition preferentially at this locality in containing glassy melt pockets. Modal, min...
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The Emperor Seamount-Hawaiian island chain is thought to originate from melting of a heterogeneous mantle plume, but the composition of the plume has always been inferred from the compositions of the erupted lavas. It has been suggested that recycled (i.e. previously subducted) basaltic oceanic crust (with or without sediments) is part of this plume and responsible for the enriched isotopic com...
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1: Department of Earth and Environmental Sciences, University of Illinois at Chicago, 845 W. Taylor Street, MC186, SES2440, Chicago, IL 60607, U.S.A. 2: Centre de Recherches Pétrographiques et Géochimiques, Nancy Université, CNRS, BP 20, 54501 Vandoeuvre Cedex France 3: Université Européenne de Bretagne, France. 4: Université de Brest ; CNRS ; UMR 6538 Domaines Océaniques; Institut Universitair...
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Continental lithospheric mantle is heterogeneous in terms of modal and chemical composition. There are fundamental differences between cratonic and younger mantle (Boyd et al., 1997), and non-cratonic mantle has broad compositional variations worldwide (McDonough, 1990). Xenoliths of spinel peridotites in alkali basalts are direct samples of lithospheric mantle but it may not be clear whether a...
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Tabular dunites in the Josephine peridotite of southwestern Oregon represent conduits for melt extraction from the upper mantle. The amount of melt trapped within these channels during cooling and exhumation of the peridotite massif was calculated using a mass-balance approach. These calculations suggest that no more than 0·1^0·2 vol. % melt could have been trapped within these dunites after cr...
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ژورنال
عنوان ژورنال: Japanese Magazine of Mineralogical and Petrological Sciences
سال: 2005
ISSN: 1345-630X,1349-7979
DOI: 10.2465/gkk.34.205