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Water transfer during magma mixing events; insights into crystal mush rejuvenation and melt extraction processes

Mattia Pistone, Jon Blundy and Richard A. Brooker
Water transfer during magma mixing events; insights into crystal mush rejuvenation and melt extraction processes
American Mineralogist (April 2017) 102 (4): 766-776

Abstract

Many plutons preserve evidence of magma mixing between hydrous mafic magmas and resident felsic crystal-rich mushes. To investigate water transfer processes in such systems following thermal equilibration, we conducted 24 h experiments to establish the petrological evolution of a water-undersaturated (4 wt% H (sub 2) O in the interstitial melt) quartz-bearing dacite crystal mush (0.5-0.8 in crystal fraction) intruded by a water-saturated (> or =6 wt% H (sub 2) O), initially crystal-free, andesite magma at 950 degrees C and 4 kbar (12 km depth). Our results show isothermal undercooling resulting from a change in liquidus temperatures of the interacting magmas due to their changing water content. Specifically, mafic samples dramatically crystallize during water escape into the felsic end-members and consequent increase in liquidus temperature. Conversely, the addition of water to the felsic mush reduces the liquidus temperature, leading to an increase in melt fraction. The experiments provide insights into how volatiles contribute to crystal mush rejuvenation (i.e., increase of melt fraction). However, H (sub 2) O diffusion alone is not sufficient to promote melt extraction from short- and long-lived mushes in the Earth's crust.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 102
Serial Issue: 4
Title: Water transfer during magma mixing events; insights into crystal mush rejuvenation and melt extraction processes
Affiliation: University of Bristol, School of Earth Sciences, Bristol, United Kingdom
Pages: 766-776
Published: 201704
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 111
Accession Number: 2017-041509
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: National Museum of Natural History, USA, United States
Country of Publication: United States
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: 201723
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