Origin and geodynamic setting of Late Cenozoic granitoids in Sulawesi, Indonesia

Maulana, Adi; Imai, Atsushi; Leeuwen, Theo van; Watanabe, Kenji; Yonezu, Kotaro; Nakano, Takanori; Boyce, Adrian J.; Page, Laurence; Scherstén, Anders

doi:10.1016/j.jseaes.2016.04.018

Cited by 26 publications

(15 citation statements)

References 60 publications

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“…Most favour a post-subduction, within plate extensional setting (cf. Maulana et al, 2016), consistent with authors' findings, which some authors based on similarities with the high-K volcanics in the Roman Province (Leterrier et al, 1990). It is generally assumed that the magmas were derived from mantle previously metasomatized by one ore more subduction events.…”

Section: Discussionsupporting

confidence: 90%

Geochemical Signatures of Potassic to Sodic Adang Volcanics, Western Sulawesi: Implications for Their Tectonic Setting and Origin

Godang

Fadlin

Priadi

2016

Indonesian J. Geosci.

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-The Adang Volcanics represent a series of (ultra) potassic to sodic lavas and tuffaceous rocks of predominantly trachytic composition, which forms the part of a sequence of Late Cenozoic high-K volcanic and associated intrusive rocks occurring extensively throughout Western Sulawesi. The tectonic setting and origin of these high-K rocks have been the subject of considerable debates. The major rock forming minerals are leucite/pseudoleucite, diopside/aegirine, and high temperature phlogopite. Geochemical plots (major oxides and trace elements) using various diagrams suggest the Adang Volcanics formed in a postsubduction, within-plate continental extension/initial rift tectonic setting. It is further suggested magma was generated by minor (< 0.1 %) partial melting of depleted MORB mantle material (garnet-lherzolite) with the silicate melt having undergone strong metasomatism. Melt enrichment is reflected in the alkaline nature of the rocks and geochemical signatures such as Nb/Zr > 0.0627 and (Hf/Sm)PM > 1.23. A comparison with the Vulsini ultrapotassic volcanics from the Roman Province in Italy shows both similarities (spidergram pattern indicating affinity with Group III ultrapotassics volcanics) and differences (nature of mantle metasomatism).Keywords: Adang Volcanics, sodic and potassic/ultrapotassic, within-plate continental extension/initial rift, metasomatized silicate melts, leucite/pseudoleucite

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Section: Discussionsupporting

confidence: 90%

Geochemical Signatures of Potassic to Sodic Adang Volcanics, Western Sulawesi: Implications for Their Tectonic Setting and Origin

Godang

Fadlin

Priadi

2016

Indonesian J. Geosci.

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“…Maulana et al (2014) reported the occurrence of clay mineral such as montmorilonite and kaolinite associated with REE enrichment in Sulawesi. The REE occurrence in Sulawesi is further supported by the I-type granitic rocks domination (Maulana et al, 2016). The existence of Sc and REE at these concentration levels in weathered ultramafic and granitic rocks has significant implications in the study of these elements.…”

Section: J O Gmentioning

confidence: 83%

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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“…Magmatism in the central part of western Sulawesi occurred during the Eocene to Pleistocene and formed the calc‐alkaline or island‐arc tholeiitic, potassic calc‐alkaline, and shoshonitic rocks. The magmatism was caused by crustal thickening in a collision event and/or partial melting in an active subduction environment (Priadi et al, ; Bergman et al, ; Elburg & Foden, ; Maulana et al, ; White et al, ). The northern part of Latimojong Metamorphic Complex was intruded by the Mio‐Pliocene Palopo Granite (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

Geological and Geochemical Characteristics of Gold Mineralization in the Salu Bulo Prospect, Sulawesi, Indonesia

2018

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The Salu Bulo prospect is one of the gold prospects in the Awak Mas project in the central part of the western province, Sulawesi, Indonesia. The gold mineralization is hosted by the meta-sedimentary rocks intercalated with the meta-volcanic and volcaniclastic rocks of the Latimojong Metamorphic Complex. The ores are approximately three meters thick, consisting of veins, stockwork, and breccias. The veins can be classified into three stages, namely, early, main, and late stages, and gold mineralization is related to the main stage. The mineral assemblage of the matrix of breccia and the veins are both composed of quartz, carbonate (mainly ankerite), and albite. High-grade gold ores in the Salu Bulo prospect are accompanied by intense alteration, such as carbonatization, albitization, silicification, and sulfidation along the main stage veins and breccia. Alteration mineral assemblage includes ankerite AE calcite, quartz, albite, and pyrite along with minor sericite. Pyrite is the most abundant sulfide mineral that is spatially related to native gold and electrum (<2-42 μm in size). It is more abundant as dissemination in the altered host rocks than those in veins. This suggests that water-rock interaction played a role to precipitate pyrite and Au in the Salu Bulo prospect. The Au contents of intensely altered host rocks and ores have positive correlations with Ag, Ni, Mo, and Na. Fluid inclusions in the veins of the main stage and the matrix of breccia are mainly two-phase liquid-rich inclusions with minor two-phase, vapor-rich, and single-phase liquid or vapor inclusions. CO 2 and N 2 gases are detected in the fluid inclusions by Laser Raman microspectrometry. Fluid boiling probably occurred when the fluid was trapped at approximately 120-190 m below the paleo water table. δ 18 O SMOW values of fluid, +5.8 and +7.6‰, calculated from δ 18 O SMOW of quartz from the main stage vein indicate oxygen isotopic exchange with wall rocks during deep circulation. δ 34 S CDT of pyrite narrowly ranges from −2.0 to +3.4‰, suggesting a single source of sulfur. Gold mineralization in the Salu Bulo prospect occurred in an epithermal condition, after the metamorphism of the host rocks. It formed at a relatively shallow depth from fluids with low to moderate salinity (3.0-8.5 wt% NaCl equiv.). The temperature and pressure of ore formation range from 190 to 210 C and 1.2 to 1.9 MPa, respectively.

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Origin and geodynamic setting of Late Cenozoic granitoids in Sulawesi, Indonesia

Cited by 26 publications

References 60 publications

Geochemical Signatures of Potassic to Sodic Adang Volcanics, Western Sulawesi: Implications for Their Tectonic Setting and Origin

Geochemical Signatures of Potassic to Sodic Adang Volcanics, Western Sulawesi: Implications for Their Tectonic Setting and Origin

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

Geological and Geochemical Characteristics of Gold Mineralization in the Salu Bulo Prospect, Sulawesi, Indonesia

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