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Geology, mineralogy and magma evolution of Gunung Slamet Volcano, Java, Indonesia

Identifieur interne : 000510 ( Istex/Corpus ); précédent : 000509; suivant : 000511

Geology, mineralogy and magma evolution of Gunung Slamet Volcano, Java, Indonesia

Auteurs : Danilo Vukadinovic ; Igan Sutawidjaja

Source :

RBID : ISTEX:64968270B36D2AEE274819F6904F55EB6FAAF52D

English descriptors

Abstract

Abstract: Gunung Slamet, Central Java, is a large stratovolcano within the Sunda magmatic arc of Indonesia. The volcanic edifice includes products of two large overlapping Quaternary stratocones. Basaltic andesites and andesites, with rare basalts, dominate the western region of the complex, known as Slamet Tua (old); and basalts and basaltic andesites compose the eastern cone, called Slamet Muda (young). On the basis of stratigraphy, trace-element content, Zr Nb, Zr K and 87Sr 86Sr ratios, Slamet lavas can be broadly categorized as relating to high abundance magma (HAM) and low abundance magma (LAM) types. The Tua and Lebaksiu sequences generally comprise the LAM group, and are older, more salic and have higher 87Sr 86Sr ratios than those of HAM. LAM andesites contain some amphibole, but HAM andesites do not. Models involving randomized magma replenishment, tapping and fractionation (RTF) were developed to explain the geochemical features of both LAM and HAM rock groups. The salic lavas of the LAM suite can be generated if fractionation was dominant relative to replenishment and tapping in LAM magma chambers. Conversely, magma chambers with a high proportion of replenishment and tapping relative to fractionation can produce dominantly mafic lavas, such as those of the HAM suite. Concave-upward heavy-rare-earth element (HREE) patterns for LAM andesites are probably due to significant amphibole fractionation; HAM andesites display flat HREE patterns and do not require amphibole fractionation from parental basalts. The high TiO2 contents of HAM basalts and basaltic andesites (relative to those of “average” arc rocks) are due to either suppressed crystallization—or minor accumulation—of Ti-magnetite, in conjunction with RTF processes.

Url:
DOI: 10.1016/0743-9547(94)00043-E

Links to Exploration step

ISTEX:64968270B36D2AEE274819F6904F55EB6FAAF52D

Le document en format XML

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<term>Andesite</term>
<term>Andesitic</term>
<term>Andesitic magmas</term>
<term>Anomaly</term>
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<term>Aswin</term>
<term>Banyumudal</term>
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<term>Basaltic</term>
<term>Basaltic andesite</term>
<term>Basaltic andesites</term>
<term>Basaltic magma</term>
<term>Baturaden</term>
<term>Baturaden basalts</term>
<term>Brown glass</term>
<term>Calcalkaline</term>
<term>Cendana</term>
<term>Cendana amphibole andesites</term>
<term>Cendana andesites</term>
<term>Central java</term>
<term>Chemical composition</term>
<term>Circles muda</term>
<term>Clinopyroxene</term>
<term>Clinopyroxene phenocrysts</term>
<term>Clinopyroxenes</term>
<term>Coefficient</term>
<term>Content increases</term>
<term>Contrib</term>
<term>Cosmochim</term>
<term>Crust</term>
<term>Crustal</term>
<term>Crustal contamination</term>
<term>Crystal aggregates</term>
<term>Crystal fractionation</term>
<term>Dacite</term>
<term>Early stages</term>
<term>Earth planet</term>
<term>Equant</term>
<term>Ewart</term>
<term>Felsic</term>
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<term>Modelling</term>
<term>Monash university</term>
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<term>Muda basalts</term>
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<term>Muda rocks</term>
<term>Muda sequence</term>
<term>Muda sequence geology</term>
<term>Muda system</term>
<term>Nicholls</term>
<term>Olivine</term>
<term>Olivine phenocrysts</term>
<term>Opaque granules</term>
<term>Open circles</term>
<term>Orthopyroxene</term>
<term>Other basalts</term>
<term>Other hand</term>
<term>Other units</term>
<term>Outcrop</term>
<term>Parental</term>
<term>Parental magmas</term>
<term>Partition coefficients</term>
<term>Partitioning</term>
<term>Petrol</term>
<term>Phenocryst</term>
<term>Phenocrysts</term>
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<term>Pyroxene phenocrysts</term>
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<term>Replenishing magma</term>
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<term>Same rock</term>
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<term>Scoria cones</term>
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<term>Sirumiang felsic host</term>
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<term>Whitford</term>
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<term>Content increases</term>
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<term>Crustal contamination</term>
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<term>Earth planet</term>
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<term>Fractionation</term>
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<term>Gunung slamet volcano</term>
<term>Gunung waka</term>
<term>High pressure</term>
<term>Hree</term>
<term>Igneous rocks</term>
<term>Inclusion</term>
<term>Island arcs</term>
<term>Isotope</term>
<term>Kalipagu</term>
<term>Kalipagu andesites</term>
<term>Kawah</term>
<term>Keruh</term>
<term>Keruh dacite</term>
<term>Lava</term>
<term>Lava slamet</term>
<term>Lebaksiu</term>
<term>Lebaksiu basalts</term>
<term>Lebaksiu lavas</term>
<term>Lebaksiu sequence</term>
<term>Lebaksiu sequences</term>
<term>Legokmene</term>
<term>Mafic</term>
<term>Magma</term>
<term>Magma chamber</term>
<term>Magma chambers</term>
<term>Magmatic</term>
<term>Magnetite</term>
<term>Major elements</term>
<term>Mendala</term>
<term>Mendala basalts</term>
<term>Modelled</term>
<term>Modelling</term>
<term>Monash university</term>
<term>Muda</term>
<term>Muda basalts</term>
<term>Muda lavas</term>
<term>Muda rocks</term>
<term>Muda sequence</term>
<term>Muda sequence geology</term>
<term>Muda system</term>
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<term>Olivine phenocrysts</term>
<term>Opaque granules</term>
<term>Open circles</term>
<term>Orthopyroxene</term>
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<term>Other hand</term>
<term>Other units</term>
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<term>Parental</term>
<term>Parental magmas</term>
<term>Partition coefficients</term>
<term>Partitioning</term>
<term>Petrol</term>
<term>Phenocryst</term>
<term>Phenocrysts</term>
<term>Plagioclase</term>
<term>Plagioclase phenocrysts</term>
<term>Positive correlation</term>
<term>Previous cycle</term>
<term>Pyroxene</term>
<term>Pyroxene phenocrysts</term>
<term>Randomized</term>
<term>Rare earth elements</term>
<term>Replenishing</term>
<term>Replenishing magma</term>
<term>Replenishment</term>
<term>Same rock</term>
<term>Scoria</term>
<term>Scoria cones</term>
<term>Sioz</term>
<term>Sirumiang</term>
<term>Sirumiang felsic host</term>
<term>Slamet</term>
<term>Slamet lavas</term>
<term>Slamet magmas</term>
<term>Slamet muda</term>
<term>Slamet pyroxenes</term>
<term>Slamet rocks</term>
<term>Slamet volcano</term>
<term>Subhedral</term>
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<term>Sumbaga andesites</term>
<term>Sutawidjaja</term>
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<term>Tioz contents</term>
<term>Trace element</term>
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<term>Volcano</term>
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<term>Whitford</term>
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<div type="abstract" xml:lang="en">Abstract: Gunung Slamet, Central Java, is a large stratovolcano within the Sunda magmatic arc of Indonesia. The volcanic edifice includes products of two large overlapping Quaternary stratocones. Basaltic andesites and andesites, with rare basalts, dominate the western region of the complex, known as Slamet Tua (old); and basalts and basaltic andesites compose the eastern cone, called Slamet Muda (young). On the basis of stratigraphy, trace-element content, Zr Nb, Zr K and 87Sr 86Sr ratios, Slamet lavas can be broadly categorized as relating to high abundance magma (HAM) and low abundance magma (LAM) types. The Tua and Lebaksiu sequences generally comprise the LAM group, and are older, more salic and have higher 87Sr 86Sr ratios than those of HAM. LAM andesites contain some amphibole, but HAM andesites do not. Models involving randomized magma replenishment, tapping and fractionation (RTF) were developed to explain the geochemical features of both LAM and HAM rock groups. The salic lavas of the LAM suite can be generated if fractionation was dominant relative to replenishment and tapping in LAM magma chambers. Conversely, magma chambers with a high proportion of replenishment and tapping relative to fractionation can produce dominantly mafic lavas, such as those of the HAM suite. Concave-upward heavy-rare-earth element (HREE) patterns for LAM andesites are probably due to significant amphibole fractionation; HAM andesites display flat HREE patterns and do not require amphibole fractionation from parental basalts. The high TiO2 contents of HAM basalts and basaltic andesites (relative to those of “average” arc rocks) are due to either suppressed crystallization—or minor accumulation—of Ti-magnetite, in conjunction with RTF processes.</div>
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<abstract lang="en">Abstract: Gunung Slamet, Central Java, is a large stratovolcano within the Sunda magmatic arc of Indonesia. The volcanic edifice includes products of two large overlapping Quaternary stratocones. Basaltic andesites and andesites, with rare basalts, dominate the western region of the complex, known as Slamet Tua (old); and basalts and basaltic andesites compose the eastern cone, called Slamet Muda (young). On the basis of stratigraphy, trace-element content, Zr Nb, Zr K and 87Sr 86Sr ratios, Slamet lavas can be broadly categorized as relating to high abundance magma (HAM) and low abundance magma (LAM) types. The Tua and Lebaksiu sequences generally comprise the LAM group, and are older, more salic and have higher 87Sr 86Sr ratios than those of HAM. LAM andesites contain some amphibole, but HAM andesites do not. Models involving randomized magma replenishment, tapping and fractionation (RTF) were developed to explain the geochemical features of both LAM and HAM rock groups. The salic lavas of the LAM suite can be generated if fractionation was dominant relative to replenishment and tapping in LAM magma chambers. Conversely, magma chambers with a high proportion of replenishment and tapping relative to fractionation can produce dominantly mafic lavas, such as those of the HAM suite. Concave-upward heavy-rare-earth element (HREE) patterns for LAM andesites are probably due to significant amphibole fractionation; HAM andesites display flat HREE patterns and do not require amphibole fractionation from parental basalts. The high TiO2 contents of HAM basalts and basaltic andesites (relative to those of “average” arc rocks) are due to either suppressed crystallization—or minor accumulation—of Ti-magnetite, in conjunction with RTF processes.</abstract>
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