Cretaceous Tectonic Setting Of Southeast Sundaland Based On Metamorphic Evolution

Soesilo, Joko

doi:10.29118/ipa.0.15.g.205

Cited by 7 publications

(8 citation statements)

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“…The geological structure that develop in Sebuku Island are generally controlled by the activity of tectonic plate from Jura (Rustandi et al, 1995). The subduction process that occurs in the Cretaceous between Meso-Tethys and Sunda Shelf caused the magmatism activity (Soesilo et al, 2015). The exhumation processes of Meratus Range occurred during Miocene (Satyana and Silitonga, 1994).…”

Section: E-issn 2809-1094 93mentioning

confidence: 99%

Petrology and Fluid Inclusion Study of W+Sb±Au Quartz Vein Mineralization in Sebuku Island, South Kalimantan, Indonesia

Noviana¹,

Idrus²,

Swamidharma³

et al. 2021

IJEG

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Sebuku Island in South Kalimantan province has hosted one of the largest Fe-Ni laterite deposits in Indonesia. Surface mapping has discovered new ore deposit types, notably quartz-bearing W+Sb±Au ore veins in the northern Sebuku. This study aims to characterize this newly-discovered deposit type and understand its origin. We present geological mapping, petrographic and ore microscopic observations, and data from XRD, bulk-ore major and trace element (XRF and ICPMS), as well as fluid inclusion microthermometric analyses. The results show that the host rocks are composed of metasandstone and metapelitic rocks. The quartz veins are associated with narrow alteration zones, comprising silicic, sericite and argillic types, which are strongly controlled by NE-trending dextral and SE-trending sinistral strike-slip faults. The veins trend approximately N120oE, and have massive, brecciated, drusy, comb and bladed textures. Ore minerals comprise mainly wolframite, stibnite, kermesite, tripuhyite, and minor arsenopyrite, pyrite and Fe-Ti oxides. The ores contain up to 958 ppm W and 1,220 ppm Sb, with wolframite and stibnite being the main ore minerals. Medium homogenization temperatures (Th) were found for the fluid inclusions, ranging from 238 to >350°C, which correspond to moderate fluid salinity of 1.4 to 5.4 wt.% NaCl eq. Based on those characteristics, the W+Sb±Au mineralization in Sebuku is similar to a mesothermal type

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Section: E-issn 2809-1094 93mentioning

confidence: 99%

Petrology and Fluid Inclusion Study of W+Sb±Au Quartz Vein Mineralization in Sebuku Island, South Kalimantan, Indonesia

Noviana¹,

Idrus²,

Swamidharma³

et al. 2021

IJEG

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“…For instance, Jaya et al (Jaya et al 2017) studied that timing of magmatism, metamorphism, and sedimentation around the basement complexes regions of Barru, Biru, and Bantimala in the South Arm of Sulawesi, Indonesia. Further, they have shown that Sulawesi Island is situated in one of the most complicated tectonic environments, which is found at the intersection of three main lithospheric plates such as the western Eurasian, southeastern Australian-Indian Plate, and eastern Paci c plates that have been reassembled and rearranged since the late Paleozoic (Miyazaki et al 1998 Although the Western Sulawesi plates include the regions of Central, Neck, and South Arms of Sulawesi Island and little portions are occupied between Australia and Sundaland (Soesilo et al 2015). A similar study performed by Mawleda et al (Mawaleda et al 2020) observed that the high or ultrahigh (Eclogite and Blue Schist) metamorphic rocks in the Bantimala Mélange Complex demonstrated the end of the Cretaceous tectonic subduction in the south Arm of Sulawesi.…”

Section: Introductionmentioning

confidence: 99%

U–Pb zircon geochronology and geochemistry of Luk Ulo River boulders belong to Late Cretaceous-Paleocene metapsammite and metagranite of Luk Ulo Karangsambung, Central Java, Indonesia

Aminuddin

Shuaib

Akhtar

et al. 2023

Environ Sci Pollut Res

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The rock formation of late Cretaceous-Paleocene granite, metapsammite, and metagranite found across Luk Ulo Complex indicated boulders with diameter of approximately one meter and rounded shape along Luk Ulo River, Indonesia. However, less research found on geochronology and geochemistry has been conducted in study area, and such rocks require comprehensive understanding of magmatism and tectonic environment of Central Java, Indonesia. Therefore, the main objective of this study is to address the geochronological and geochemical age histories across Central Java, Indonesia using U-Pb zircon dating technique. Generally, most common types of rocks were observed which composed of hornblende and garnet-bearing granite, metapsammite, and metagranite. The geochemical study showed that protolith of rocks with hornblende was identi ed as Cordilleran granitoid (I-type), which originated from magmatic arc with basaltic differentiation. Further, protolith of rocks containing garnet was categorized as Caledonian granitoid (S-type), which is caused by post-collisional orogeny. The cluster observations of magmatic zircons reveal their magmatic ages, which vary from 67.00 + 1.2 to 69.10 + 0.91 Ma (late Cretaceous), whereas ages of inherited zircons ranged from 100 + 5 to 437 + 13 Ma (early Cretaceous to Silurian). Estimated periods of partial melting were found between 100-5 Ma and 118-4 Ma (early Cretaceous). Comparing the zircon ages of Luk Ulo with the zircon ages from the Sundaland regions reveals that the age distribution patterns are incredibly similar; the peak ages dispersed between the Cretaceous and Triassic periods, as well as Sundaland region was the source of the materials.

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“…The relevant research (Soesilo et al, 2015) identified the metamorphism type of metamorphic belt in the area between Java Sea and Mangkalihat Peninsula and also western part of Central Sulawesi. The research (Setiawan et al, 2015) revealed the metamorphic evolution through determining the facies and metamorphism type of meratus complex in South Kalimantan.…”

Section: Introductionmentioning

confidence: 99%

The Facies and Metamorphism Types Determination of Metamorphic Rock in The Part of Mekongga Complex

Musnajam¹,

Karim²,

Nurfadillah³

et al. 2020

Geos. Ind.

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Lambolemo Village is geomorphologically dominated by hilly slopes morphology. Lithology in the form of metamorphic rocks are mica schists and chlorite schists. The present research aimed to determine the facies and metamorphism types of metamorphic rocks in Lambolemo Village. The research methods engaged were field observation and laboratory observation utilizing petrographic analysis. Observations stage generated texture data and set of mineral both macroscopically and microscopically. The minerals were discovered within metamorphic rock of the research area, namely: muscovite, quartz, biotite, and chlorite. These findings then classified into two zones, there were chlorite zone and biotite zone. These zones were embodied into greenschist facies with chlorite mineral index. The greenschist facies was characterized with chlorite, albit, epidote, and actinolite minerals appearance. The metamorphic rock had a foliation structure. The structure was commonly generated by a regional metamorphic process, which was particularly a feature of the clear alignment, translucent minerals from flat minerals, such as : mica, chlorite and minerals that obtained fibers or scents. Keywords: Determination; Facies; Metamorfism Type Copyright (c) 2020 Geosfera Indonesia Journal and Department of Geography Education, University of Jember This work is licensed under a Creative Commons Attribution-Share A like 4.0 International License

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Cretaceous Tectonic Setting Of Southeast Sundaland Based On Metamorphic Evolution

Cited by 7 publications

References 0 publications

Petrology and Fluid Inclusion Study of W+Sb±Au Quartz Vein Mineralization in Sebuku Island, South Kalimantan, Indonesia

Petrology and Fluid Inclusion Study of W+Sb±Au Quartz Vein Mineralization in Sebuku Island, South Kalimantan, Indonesia

U–Pb zircon geochronology and geochemistry of Luk Ulo River boulders belong to Late Cretaceous-Paleocene metapsammite and metagranite of Luk Ulo Karangsambung, Central Java, Indonesia

The Facies and Metamorphism Types Determination of Metamorphic Rock in The Part of Mekongga Complex

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