Petrology, geochemistry and tectonic evolution of the South Sulawesi basement rocks, Indonesia

Maulana, Adi; Ellis, David J.; Christy, Andrew G.

doi:10.29118/ipa.707.10.g.192

Cited by 9 publications

(19 citation statements)

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“…The bedrock in Petea profile contains of 40.8 wt% SiO 2 , 34.8 wt% of MgO,8.7 wt% Fe 2 O 3 , 0.2 wt% Ni, and 9.8 ppm Sc. In relation to this, the weathering profile shows a decreasing content of SiO 2 and MgO, and an increasing trend of Kadarusman et al, 2004;Maulana, 2009 and variation of REE in the weathered granitic crusts in the studied area are summarized in Figure 5. Generally, the weathered crusts show a higher concentration of total REE and REE + Y compared to their parent rocks as reported by Maulana et al (2014).…”

Section: Geochemistry Of Sc In Weathering Profile Of Ultramafic Rocksmentioning

confidence: 70%

“…It is reported that Sc content is abundant in pyroxenite from Bantimala Complex, South Sulawesi (Maulana et al, 2015). Sulawesi Island is located in the central part of the Indonesian Archipelago, which consists of four tectonic provinces (Kadarusman et al, 2004;Maulana, 2009;Maulana et al, 2015): (1) the West and North Sulawesi Pluto-Volcanic Arc in the south and north arms of the island, (2) the Central Sulawesi Metamorphic Belt, extending from the centre of the island to the southeastern arm, (3) the East Sulawesi Ophiolite Belt in the eastern arm, and (4) the Banggai-Sula and Tukang Besi continental fragments (Figure 1). Each tectonic province has occurrences of Mesozoic rocks containing metamorphic and mafic-ultramafic suites.…”

Section: Scandiummentioning

confidence: 99%

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An Overview on the Possibility of Scandium and REE Occurrence in Sulawesi, Indonesia

Maulana

Sanematsu²,

Sakakibara

2016

Indonesian J. Geosci.

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-The development in modern-high technology application is growing rapidly, resulting in the constant supply of critical metal and rare earth elements (REE). Currently, resources of these elements are restricted and new source of these elements need to be discovered accordingly. Scandium (Sc) as one of critical metals is an important metal for electrolyte of solid oxide fuel cells and other advance technology. In addition, REE are the important elements in the use of permanent magnets and rechargeable batteries. This manuscript reports an overview on the possibility of scandium and rare earth element occurrences in Sulawesi. Sc is concentrated in limonite layers in Soroako ultramafic rocks as a result of Fe 3+ site substitution of mafic minerals (pyroxene, amphibole, etc.) during a laterization process. REE are enriched in association with clay minerals in B horizon from heavily weathered granitic rocks in Palu and Masamba, suggesting the possibility of ion-adsorption style mineralization. The lateritic soil of the ultramafic rocks and the weathered crusts of the granitic rocks in Sulawesi could be the potential sources of scandium and rare earth elements, respectively.

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Section: Geochemistry Of Sc In Weathering Profile Of Ultramafic Rocksmentioning

confidence: 70%

Section: Scandiummentioning

confidence: 99%

An Overview on the Possibility of Scandium and REE Occurrence in Sulawesi, Indonesia

Maulana

Sanematsu²,

Sakakibara

2016

Indonesian J. Geosci.

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“…Sulawesi Island is located in the central part of the Indonesian archipelago, which consists of four tectonic provinces (Kadarusman et al, 2004;Maulana, 2009)…”

Section: Introductionmentioning

confidence: 99%

Petrology, geochemistry and tectonic significance of serpentinized ultramafic rocks from the South Arm of Sulawesi, Indonesia

2015

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Serpentinized ultramafic rocks occur in two separate basement complexes in the South Arm of Sulawesi, the Bantimala and Barru Blocks. We present petrographic, mineral chemical and geochemical data for these rocks, and interpret them in terms of petrogenesis and tectonic setting.The rocks of both blocks show strong serpentinization of original anhydrous silicates. The Bantimala ultramafics consist mainly of peridotite (harzburgite and dunite) and clinopyroxenite, with lenses of podiform chromitite. Metamorphism is evidenced by the occurrence of tremolite schists. In contrast, the Barru ultramafics consist of harzburgite peridotite and podiform chromitite.They also show an amphibolite-facies overprint that in this case may be related to intrusion by a large dacite/granodiorite body. The absence of garnet indicates that the ultramafics in neither block experienced high-pressure conditions. Whole-rock trace element analyses and spinel compositions show that the Barru harzburgite is depleted relative to primitive mantle, and has had some melt extracted. In contrast, the Bantimala dunite, harzburgite and clinopyroxenite are cumulates. Both are derived from a supra-subduction zone environment, and were obducted during the closure of small back-arc basins. If there has been no rotation of the blocks, then the Bantimala ultramafics were emplaced from an ENE direction, while the Barru ultramafics were emplaced from the WNW. The ultramafic suites from these two blocks are juxtaposed with metamorphic assemblages which were later intruded by younger volcanics, particularly in the Barru Block.

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“…The Cenozoic collision(s) of continental fragments have disrupted or buried much of the Mesozoic continental margin, but fragments of pre‐Cenozoic basement are preserved in Sulawesi, particularly in the Bantimala Complex (Hamilton ; Sukamto ; Parkinson ; Parkinson et al . ; Wakita ; Maulana ).…”

Section: Introductionmentioning

confidence: 99%

“…The Bantimala Complex consists of two separate blocks: namely the Bantimala Block in the south and the Barru Block in the north (Maulana ). A wide variety of lithologies of various ages (Sukamto ; Hamilton ; van Leeuwen ; Miyazaki et al .…”

Section: Introductionmentioning

confidence: 99%

Geochemistry of eclogite‐ and blueschist‐facies rocks from the Bantimala Complex, South Sulawesi, Indonesia: Protolith origin and tectonic setting

et al. 2013

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We present the first data on bulk-rock major and trace element compositions for a suite of eclogite-and blueschist-facies rocks from the Bantimala Complex, Indonesia, with the aim of better constraining the protolith origins and nature of the subducted crust. The eclogites can be classified into two groups: glaucophane-rich eclogite and glaucophanefree eclogite, whereas the blueschists are divided into albite-epidote glaucophanite and quartz-glaucophane schists. SiO 2 contents of the eclogites are 43.3-49.6 wt%, with Na 2 O + K 2 O contents 3.7-4.7 wt%. The blueschists show a wider range of compositions, with SiO 2 = 40.7-63.8 wt% and Na 2 O + K 2 O = 2.7-4.5 wt%. Trace element data suggest that the eclogite protoliths include both enriched and normal mid-oceanic ridge basalt (E-MORB and N-MORB) and also gabbroic cumulates. The blueschists show more variation in protoliths, which include N-MORB, Oceanic Island Basalt (OIB) and Island Arc Basalt (IAB). Plots of element concentrations against the immobile Zr show considerable mobility of large ion lithophiles but not of high field-strength elements during highpressure metamorphism, and indicate that the high SiO 2 content of some blueschists is probably due to metasomatism by a LILE-rich siliceous aqueous fluid. Strong correlations between K, Rb, Ba and Cs suggests that enrichment of these elements occurred by a single process. All the protoliths were subducted, metamorphosed to blueschist/eclogite-facies and subsequently exhumed. It is noteworthy that the samples deduced to have come from thicker-crust environments (OIB, IAB) were subducted to shallower depths (blueschistfacies) than MORB-derived samples, all except one of which reached eclogite-facies conditions. The geochemical data of this study demonstrate the variety of ocean floor types that were subducted under the southeast margin of Sundaland in the late Jurassic period.

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Petrology, geochemistry and tectonic evolution of the South Sulawesi basement rocks, Indonesia

Cited by 9 publications

References 0 publications

An Overview on the Possibility of Scandium and REE Occurrence in Sulawesi, Indonesia

An Overview on the Possibility of Scandium and REE Occurrence in Sulawesi, Indonesia

Petrology, geochemistry and tectonic significance of serpentinized ultramafic rocks from the South Arm of Sulawesi, Indonesia

Geochemistry of eclogite‐ and blueschist‐facies rocks from the Bantimala Complex, South Sulawesi, Indonesia: Protolith origin and tectonic setting

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