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Textural history of recent basaltic-andesites and plutonic inclusions from Merapi volcano

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 crystalli... Full description

Journal Title: Contributions to mineralogy and petrology 2013-03-17, Vol.166 (1), p.43-63
Main Author: van der Zwan, Froukje M
Other Authors: Chadwick, Jane P , Troll, Valentin R
Format: Electronic Article Electronic Article
Language: English
Subjects:
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_crossref_primary_10_1007_s00410_013_0864_7
title: Textural history of recent basaltic-andesites and plutonic inclusions from Merapi volcano
format: Article
creator:
  • van der Zwan, Froukje M
  • Chadwick, Jane P
  • Troll, Valentin R
subjects:
  • Analysis
  • Basalt
  • Basaltic-andesite
  • Crystal size distribution
  • Earth and Environmental Science
  • Earth and Related Environmental Sciences
  • Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
  • Earth Sciences
  • Geologi
  • Geology
  • Geovetenskap med inriktning mot mineralogi, petrologi och tektonik
  • Geovetenskap och miljövetenskap
  • Merapi volcano
  • Mineral Resources
  • Mineralogy
  • Natural Sciences
  • Naturvetenskap
  • Original Paper
  • Plutonic inclusions
  • Porphyry
  • Volcanic plumbing system
ispartof: Contributions to mineralogy and petrology, 2013-03-17, 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
source:
identifier: ISSN: 0010-7999
fulltext: no_fulltext
issn:
  • 0010-7999
  • 1432-0967
  • 1432-0967
url: Link


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titleTextural history of recent basaltic-andesites and plutonic inclusions from Merapi volcano
creatorvan der Zwan, Froukje M ; Chadwick, Jane P ; Troll, Valentin R
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descriptionMt. 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 <1.6 mm in size. Crustal assimilation is indicated by, for example, oxygen isotopes and based on the CSD data, crystallisation combined with contamination is likely semi-continuous in these upper crustal storage chambers. The CSD data observed in the basaltic-andesite samples are remarkably consistent and require a large-volume steady state magmatic system beneath Merapi in which late textural equilibration plays a significant role. Plagioclase CSDs of co-eruptive magmatic and plutonic inclusions may contain a third crystal population (<1 mm) not found in the lavas. This third population has probably formed from enhanced degassing of portions of basaltic-andesite magma at shallow crustal levels which resulted in increased crystallinity and basaltic-andesite mush inclusions. A suite of coarse plutonic inclusions is also present that reflects crystallisation and accumulation of crystals in the deep Merapi plumbing system, as deduced from CSD patterns and mineral assemblages.
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subjectAnalysis ; Basalt ; Basaltic-andesite ; Crystal size distribution ; Earth and Environmental Science ; Earth and Related Environmental Sciences ; Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics ; Earth Sciences ; Geologi ; Geology ; Geovetenskap med inriktning mot mineralogi, petrologi och tektonik ; Geovetenskap och miljövetenskap ; Merapi volcano ; Mineral Resources ; Mineralogy ; Natural Sciences ; Naturvetenskap ; Original Paper ; Plutonic inclusions ; Porphyry ; Volcanic plumbing system
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descriptionMt. 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 <1.6 mm in size. Crustal assimilation is indicated by, for example, oxygen isotopes and based on the CSD data, crystallisation combined with contamination is likely semi-continuous in these upper crustal storage chambers. The CSD data observed in the basaltic-andesite samples are remarkably consistent and require a large-volume steady state magmatic system beneath Merapi in which late textural equilibration plays a significant role. Plagioclase CSDs of co-eruptive magmatic and plutonic inclusions may contain a third crystal population (<1 mm) not found in the lavas. This third population has probably formed from enhanced degassing of portions of basaltic-andesite magma at shallow crustal levels which resulted in increased crystallinity and basaltic-andesite mush inclusions. A suite of coarse plutonic inclusions is also present that reflects crystallisation and accumulation of crystals in the deep Merapi plumbing system, as deduced from CSD patterns and mineral assemblages.
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4Earth and Environmental Science
5Earth and Related Environmental Sciences
6Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
7Earth Sciences
8Geologi
9Geology
10Geovetenskap med inriktning mot mineralogi, petrologi och tektonik
11Geovetenskap och miljövetenskap
12Merapi volcano
13Mineral Resources
14Mineralogy
15Natural Sciences
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17Original Paper
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abstractMt. 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 <1.6 mm in size. Crustal assimilation is indicated by, for example, oxygen isotopes and based on the CSD data, crystallisation combined with contamination is likely semi-continuous in these upper crustal storage chambers. The CSD data observed in the basaltic-andesite samples are remarkably consistent and require a large-volume steady state magmatic system beneath Merapi in which late textural equilibration plays a significant role. Plagioclase CSDs of co-eruptive magmatic and plutonic inclusions may contain a third crystal population (<1 mm) not found in the lavas. This third population has probably formed from enhanced degassing of portions of basaltic-andesite magma at shallow crustal levels which resulted in increased crystallinity and basaltic-andesite mush inclusions. A suite of coarse plutonic inclusions is also present that reflects crystallisation and accumulation of crystals in the deep Merapi plumbing system, as deduced from CSD patterns and mineral assemblages.
copBerlin/Heidelberg
pubSpringer-Verlag
doi10.1007/s00410-013-0864-7