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GEOREF RECORD

Experimental constraints on the formation of silicic magmas

Bruno Scaillet, Francois Holtz and Michel Pichavant
Experimental constraints on the formation of silicic magmas (in Enigmatic relationship between silicic volcanic and plutonic rocks, Craig C. Lundstrom (editor) and Allen F. Glazner (editor))
Elements (April 2016) 12 (2): 109-114

Abstract

A rich history of experimental petrology has revealed the paths by which silicic igneous rocks follow mineral-melt equilibria during differentiation. Subdividing these rocks by 'molar Al versus Ca + Na + K' illustrates first-order differences in mineralogy and gives insight into formation mechanisms. Peraluminous magmas, formed by partial melting of sediments, largely owe their attributes and compositions to melting reactions in the protoliths, whereas most metaluminous felsic magmas record both continental and mantle inputs. Peralkaline rhyolites are mainly derived from either protracted crystallization or small degrees of partial melting of basalt, with only a marginal crustal contribution. Most silicic magmas hold 3-7 wt% H (sub 2) O (sub melt) , which is inversely correlated with pre-eruptive temperature (700 degrees C to >950 degrees C) but unrelated to their reduced/oxidized state.


ISSN: 1811-5209
Serial Title: Elements
Serial Volume: 12
Serial Issue: 2
Title: Experimental constraints on the formation of silicic magmas
Title: Enigmatic relationship between silicic volcanic and plutonic rocks
Author(s): Scaillet, BrunoHoltz, FrancoisPichavant, Michel
Author(s): Lundstrom, Craig C.editor
Author(s): Glazner, Allen F.editor
Affiliation: Universite d'Orleans, Institut des Sciences de la Terre d'Orleans, Orleans, France
Affiliation: University of Illinois Urbana Champaign, Department of Geology, Champaign, IL, United States
Pages: 109-114
Published: 201604
Text Language: English
Publisher: Mineralogical Society of America and Mineralogical Society of Great Britain and Ireland and Mineralogical Association of Canada and Geochemical Society and Clay Minerals Society, International
References: 30
Accession Number: 2016-036333
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: University of North Carolina, USA, United StatesLeibniz Universitaet Hannover, DEU, Germany
Country of Publication: International
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201618
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