Petrology, geochemistry and paleogeographic reconstruction of the East Sulawesi Ophiolite, Indonesia

Kadarusman, Ade; Miyashita, Sumio; Maruyama, Shigenori; Parkinson, C. D.; Ishikawa, Akira

doi:10.1016/j.tecto.2004.04.008

Cited by 124 publications

(113 citation statements)

References 35 publications

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“…The lake is situated within the East Sulawesi Ophiolite ( Fig. 1; Kadarusman et al, 2004;Monnier et al, 1995), the third largest ophiolite in the world, which releases iron, chromium, and other metals that catalyze biogeochemical activity by a unique and diverse microbial community in the lake and its sediments (Crowe et al, 2008). Lake Towuti's Kadarusman et al, 2004), and (c) the configuration of the Malili lake system.…”

Section: Introductionmentioning

confidence: 99%

“…The southeast arm, which houses Lake Towuti, is dominated by the highly tectonized East Sulawesi Ophiolite, which is inter-thrust with Mesozoic and Cenozoic sediments. These rocks are comprised of ultramafic mantle peridotites (lherzolites and harzburgites), cumulate gabbros, and basalts of normal mid-ocean ridge composition (Kadarusman et al, 2004;Monnier et al, 1995). The ophiolites have sourced large lateritic nickel deposits that have attracted the mining industry since the beginning of the 1970s, with active operations and extensive infrastructure in the region currently operated by PT Vale Indonesia (a subsidiary of Vale SA).…”

Section: Introductionmentioning

confidence: 99%

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The Towuti Drilling Project: paleoenvironments, biological evolution, and geomicrobiology of a tropical Pacific lake

et al. 2016

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Abstract. The Towuti Drilling Project (TDP) is an international research program, whose goal is to understand long-term environmental and climatic change in the tropical western Pacific, the impacts of geological andPublished by Copernicus Publications on behalf of the IODP and the ICDP. The Towuti Drilling Project environmental changes on the biological evolution of aquatic taxa, and the geomicrobiology and biogeochemistry of metal-rich, ultramafic-hosted lake sediments through the scientific drilling of Lake Towuti, southern Sulawesi, Indonesia. Lake Towuti is a large tectonic lake at the downstream end of the Malili lake system, a chain of five highly biodiverse lakes that are among the oldest lakes in Southeast Asia. In 2015 we carried out a scientific drilling program on Lake Towuti using the International Continental Scientific Drilling Program (ICDP) Deep Lakes Drilling System (DLDS). We recovered a total of ∼ 1018 m of core from 11 drilling sites with water depths ranging from 156 to 200 m. Recovery averaged 91.7 %, and the maximum drilling depth was 175 m below the lake floor, penetrating the entire sedimentary infill of the basin. Initial data from core and borehole logging indicate that these cores record the evolution of a highly dynamic tectonic and limnological system, with clear indications of orbital-scale climate variability during the mid-to late Pleistocene.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Towuti Drilling Project: paleoenvironments, biological evolution, and geomicrobiology of a tropical Pacific lake

et al. 2016

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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 'K'-shape of Sulawesi Island is attributed to four principal lithotectonic belts, which are bounded by large-scale tectonic dislocations and comprise the West Sulawesi Volcano-Plutonic Arc Belt, the Central Sulawesi Metamorphic Belt, the East Sulawesi Ophiolite Belt, and the continental fragments of Banggai-Sula, TukangBesi, and Buton ( Fig. 1) (Mubroto et al, 1994;Kadarusman et al, 2004). The study area is located in the East Sulawesi Ophiolite Belt in which Cretaceous ultramafic rocks crop out because of subduction processes which occurred in the Miocene, approximately 10 Ma ago (Golightly, 1979;Suratman, 2000).…”

Section: Study Area and Geological Settingmentioning

confidence: 99%

Ni grade distribution in laterite characterized from geostatistics, topography and the paleo-groundwater system in Sorowako, Indonesia

Ilyas

Kashiwaya

Koike

2016

Journal of Geochemical Exploration

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Petrology, geochemistry and paleogeographic reconstruction of the East Sulawesi Ophiolite, Indonesia

Cited by 124 publications

References 35 publications

The Towuti Drilling Project: paleoenvironments, biological evolution, and geomicrobiology of a tropical Pacific lake

The Towuti Drilling Project: paleoenvironments, biological evolution, and geomicrobiology of a tropical Pacific lake

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

Ni grade distribution in laterite characterized from geostatistics, topography and the paleo-groundwater system in Sorowako, Indonesia

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