Magma-carbonate interaction processes and associated CO2 release at Merapi volcano, Indonesia: insights from experimental petrology

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Magma-carbonate interaction processes and associated CO2 release at Merapi volcano, Indonesia: insights from experimental petrology

Deegan, Frances (författare): Uppsala universitet,Berggrundsgeologi,Mineralogi, petrologi och tektonik,CEMPEG

Troll, Valentin (författare): Uppsala universitet,Berggrundsgeologi,Mineralogi, petrologi och tektonik,CEMPEG

Freda, C. (författare): Istituto Nazionale Di Geofisica E Vulcanologia, 00143 Rome, Italy

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Misiti, V. (författare): Istituto Nazionale Di Geofisica E Vulcanologia, 00143 Rome, Italy

Chadwick, J.P. (författare): Department of Petrology (Falw), Vrije Universiteit, 1081 Hv Amsterdam, The Netherlands

McLeod, C. (författare): Department of Earth Sciences, The University of Durham, Durham Dh1 3Le, UK

Davidson, J.P. (författare): Department of Earth Sciences, The University of Durham, Durham Dh1 3Le, UK

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2010-05-15
2010
Engelska.
Ingår i: Journal of Petrology. - : Oxford University Press (OUP). - 0022-3530 .- 1460-2415. ; 51:5, s. 1027-1051

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Tidskriftsartikel (refereegranskat)

Abstract Ämnesord

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There is considerable evidence for continuing, late-stage interaction between the magmatic system at Merapi volcano, Indonesia, and local crustal carbonate (limestone). Calc-silicate xenoliths within Merapi basaltic-andesite eruptive rocks display textures indicative of intense interaction between magma and crustal carbonate, and Merapi feldspar phenocrysts frequently contain crustally contaminated cores and zones. To resolve the interaction processes between magma and limestone in detail we have performed a series of time-variable decarbonation experiments in silicate melt, at magmatic pressure and temperature, using a Merapi basaltic-andesite and local Javanese limestone as starting materials. We have used in situ analytical methods to determine the elemental and strontium isotope composition of the experimental products and to trace the textural, chemical, and isotopic evolution of carbonate assimilation. The major processes of magma-carbonate interaction identified are: (1) rapid decomposition and degassing of carbonate; (2) generation of a Ca-enriched, highly radiogenic strontium contaminant melt, distinct from the starting material composition; (3) intense CO2 vesiculation, particularly within the contaminated zones; (4) physical mingling between the contaminated and unaffected melt domains; (5) chemical mixing between melts. The experiments reproduce many of the features of magma-carbonate interaction observed in the natural Merapi xenoliths and feldspar phenocrysts. The Ca-rich, high 87Sr/86Sr contaminant melt produced in the experiments is considered as a precursor to the Ca-rich (often 'hyper-calcic') phases found in the xenoliths and the contaminated zones in Merapi feldspars.The xenoliths also exhibit micro-vesicular textures that can be linked to the CO2 liberation process seen in the experiments.This study, therefore, provides well-constrained petrological insights into the problem of crustal interaction at Merapi and points toward the substantial impact of such interaction on the volatile budget of the volcano.

Ämnesord

NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Multidisciplinär geovetenskap (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geosciences, Multidisciplinary (hsv//eng)

Nyckelord

Carbon dioxide
Experimental petrology
Magma-carbonate interaction
Merapi
Strontium isotopes
Earth sciences
Geovetenskap
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Geovetenskap med inriktning mot mineralogi, petrologi och tektonik

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Av författaren/redakt...: Deegan, Frances; Troll, Valentin; Freda, C.; Misiti, V.; Chadwick, J.P.; McLeod, C.; visa fler...; Davidson, J.P.; visa färre...

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Av lärosätet: Uppsala universitet

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