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All Journal IJOG : Indonesian Journal on Geoscience Journal of Geoscience, Engineering, Environment, and Technology Buletin Sumber Daya Geologi Indonesian Journal on Geoscience Indonesian Journal on Geoscience Journal of Applied Geology Berita Sedimentologi Jurnal Geologi dan Sumberdaya Mineral
Nugroho Imam Setiawan
Universitas Gadjah Mada
Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Environmental Science Physics

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Journal : Indonesian Journal on Geoscience

 1 
Metamorphic Evolution of Garnet-bearing Epidote-Barroisite Schist from the Meratus Complex in South Kalimantan, Indonesia Setiawan, Nugroho Imam; Osanai, Yasuhito; Nakano, Nobuhiko; Adachi, Tatsuro; Asy’ari, Amril
Indonesian Journal on Geoscience Vol 2, No 3 (2015)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.2.3.139-156

Abstract

DOI:10.17014/ijog.2.3.139-156This paper presents metamorphic evolution of metamorphic rocks from the Meratus Complex in South Kalimantan, Indonesia. Eight varieties of metamorphic rocks samples from this location, which are garnet-bearing epidote-barroisite schist, epidote-barroisite schist, glaucophane-quartz schist, garnet-muscovite schist, actinolite-talc schist, epidote schist, muscovite schist, and serpentinite, were investigated in detail its petrological and mineralogical characteristics by using polarization microscope and electron probe micro analyzer (EPMA). Furthermore, the pressure-temperature path of garnet-bearing epidote-barroisite schist was estimated by using mineral parageneses, reaction textures, and mineral chemistries to assess the metamorphic history. The primary stage of this rock might be represented by the assemblage of glaucophane + epidote + titanite ± paragonite. The assemblage yields 1.7 - 1.0 GPa in assumed temperature of 300 - 550 °C, which is interpreted as maximum pressure limit of prograde stage. The peak P-T condition estimated on the basis of the equilibrium of garnet rim, barroisite, phengite, epidote, and quartz, yields 547 - 690 °C and 1.1 - 1.5 GPa on the albite epidote amphibolite-facies that correspond to the depth of 38 - 50 km. The retrograde stage was presented by changing mineral compositions of amphiboles from the Si-rich barroisite to the actinolite, which lies near 0.5 GPa at 350 °C. It could be concluded that metamorphic rocks from the Meratus Complex experienced low-temperature and high-pressure conditions (blueschist-facies) prior to the peak metamorphism of the epidote amphibolite-facies. The subduction environments in Meratus Complex during Cretaceous should be responsible for this metamorphic condition.
Peak Metamorphic Conditions of Garnet Amphibolite from Luk Ulo Complex, Central Java, Indonesia: Implications for Medium-Pressure/High-Temperature Metamorphism in the Central Indonesian Accretionary Collision Complex Setiawan, Nugroho Imam; Osanai, Yasuhito; Nakano, Nobuhiko; Adachi, Tatsuro; Hendratno, Agus; Sasongko, Wahyu; Ansori, Chusni
Indonesian Journal on Geoscience Vol 7, No 3 (2020)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.7.3.225-239

Abstract

DOI:10.17014/ijog.7.3.225-239Garnet amphibolites, which suggest medium-pressure/high-temperature (MP/HT), are widely recognized in Luk Ulo Complex, Central Java. Their occurrences associated with high-pressure/low-temperature (HP/LT; eclogite, blueschist) metamorphic rocks in the Luk Ulo Complex will provide important constraint on the geodynamic model of Central Indonesian Accretionary Collision Complex (CIACC). This study aimed to estimates P-T metamorphic condition of garnet amphibolite from Luk Ulo Complex by using mineral parageneses, thermodynamic data, and NCKFMASHO pseudosection. Prograde stage assemblages represented by inclusions in the garnet, which are garnet core, zoisite, titanite, apatite, and quartz. Mineral coexistences at the peak P-T condition are garnet rim, magnesio-hornblende, zoisite, titanite, quartz, albite, and phengite. The retrograde stage represented by secondary minerals fill the crack in the garnet and other minerals, which are chlorite and quartz. P-T metamorphic condition of garnet amphibolite can only be interpreted from the peak metamorphic stage. The temperature of the garnet amphibolite is estimated using the garnet-amphibole and garnet-phengite geothermometers. Meanwhile, the pressure condition is estimated from phengite geobarometer. The results were compared to the stability and compositions of the phases in NCKFMASHO pseudosection in order to constrain the peak P-T metamorphic conditions. It is concluded that the peak P-T metamorphic condition for garnet amphibolite is 0.9 - 1.4 GPa and 558 - 606 ºC. The estimated peak P-T metamorphic temperature is higher compared to the previously published gradient geothermal of eclogite and tourmaline-eclogite in the Luk Ulo Complex. The MP/HT (amphibolite) and HP/LT (blueschist and eclogite) metamorphic rocks could have similar metamorphic ages if both footwall and hanging wall had initially very high thermal gradients and the rate of subduction was very slow (10 km/Ma or less).
Co-Authors Adachi, Tatsuro Adachi, Tatsuro Agung Harijoko Agus Hendratno Ahmad Aminuddin, Muhammad Irman Khalif bin Amril Asy’ari, Amril Amril Asy’ari Ansori, Chusni Ariffin, Kamar Shah Arifudin Idrus Arifudin Idrus Asy’ari, Amril Chusni Ansori Chusni Ansori Haryo Edi Wibowo Herfien Samalehu Herfien Samalehu Herry Yogaswara I Gde Budi Indrawan I Wayan Warmada Indranova Suhendro Joko Wahyudiono Kamar Shah Ariffin Kotaro Yonezu Lucas Donny Setiadji Muhammad Irman Khalif bin Ahmad Aminuddin Nakano, Nobuhiko Nakano, Nobuhiko Nobuhiko Nakano Nobuhiko Nakano Nobuhiko Nakano Nobuhiko Nakano Nobuhiko Nakano, Nobuhiko Osanai, Yasuhito Osanai, Yasuhito Tatsuro Adachi Tatsuro Adachi Tatsuro Adachi Tatsuro Adachi Tatsuro Adachi, Tatsuro Wahyu Sasongko Wakhid Khoiron Nugroho Yasuhito Osanai Yasuhito Osanai Yasuhito Osanai Yasuhito Osanai Yasuhito Osanai, Yasuhito Yonezu, Kotaro