Textural history of recent basaltic-andesites and plutonic inclusions from Merapi volcano
Journal Title: | Contributions to mineralogy and petrology 2013, Vol.166 (1), p.43-63 |
Main Author: | van der Zwan, Froukje M |
Other Authors: | Chadwick, Jane P , Troll, Valentin R |
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English |
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Publisher: | Berlin/Heidelberg: Springer-Verlag |
ID: | ISSN: 0010-7999 |
Link: | http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-204782 |
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recordid: | cdi_swepub_primary_oai_DiVA_org_uu_204782 |
title: | Textural history of recent basaltic-andesites and plutonic inclusions from Merapi volcano |
format: | Article |
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ispartof: | Contributions to mineralogy and petrology, 2013, Vol.166 (1), p.43-63 |
description: | Mt. Merapi in Central Java is one of the most active stratovolcanoes on Earth and is underlain by a multistage plumbing system. Crystal size distribution analyses (CSD) were carried out on recent Merapi basaltic-andesites and co-eruptive magmatic and plutonic inclusions to characterise the crystallisation processes that operate during storage and ascent and to obtain information on respective time scales. The basaltic-andesites exhibit log-linear, kinked-upwards CSD curves for plagioclase and clinopyroxene that can be separated into two main textural populations. Large plagioclase phenocrysts (≥1.6 mm) make up one population, but correspond to crystals with variable geochemical composition and reflect a period of crystal growth at deep to mid-crustal levels. This population was subsequently influenced by crystal accumulation and the onset of crustal assimilation, including the incorporation of high-Ca skarn-derived xenocrysts. Textural re-equilibration is required for these crystals to form a single population in CSD. A second episode of crystal growth at shallower levels is represented by chemically homogenous plagioclase crystals |
language: | eng |
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identifier: | ISSN: 0010-7999 |
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url: | Link |
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