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

Froukje M. van der Zwan, Jane P. Chadwick, Valentin R. Troll

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

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
Original languageEnglish (US)
Pages (from-to)43-63
Number of pages21
JournalContributions to Mineralogy and Petrology
Volume166
Issue number1
DOIs
StatePublished - Jul 1 2013
Externally publishedYes

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