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

doi:10.17014/ijog.2.3.139-156

Cited by 16 publications

(12 citation statements)

References 23 publications

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“…Moreover, the occurrence of barroisite inclusions in garnet porphyroblasts is typical of metamorphic terranes characterized by basaltic and pelitic protoliths that experienced HP/LT gradients (e.g. Clarke, Aitchison, & Cluzel, 1997;Forneris & Holloway, 2003;Ko, Enami, & Aoya, 2005;Kouketsu, Enami, & Mizukami, 2010;Li, Takasu, Liu, & Guo, 2010;Lü, Bucher, Zhang, & Du, 2012;Mposkos, Baziotis, & Proyer, 2012;Schulz, Triboulet, Audren, Pfeifer, & Gilg, 2001;Setiawan, Osanai, Nakano, Adachi, & Asy'ari, 2015;Zhang et al, 2013). The stability of barroisite preserved inside garnet therefore indicates that the Mammola Paragneiss Unit reached a maximum pressure of ~0.9 GPa (i.e.…”

Section: Metamorphic Evolution Of the Mammola Paragneiss Unitmentioning

confidence: 99%

Hercynian subduction‐related processes within the metamorphic continental crust in Calabria (southern Italy)

Tursi

Spiess

Festa

et al. 2020

Journal Metamorphic Geology

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Linking the deformation history of mylonitized continental rocks to the progress of devolatilization reactions that trigger reaction softening is critical for the understanding of crustal scale processes. We have analysed the field geometries and microstructures of deformed rocks within the southern Hercynian belt in Calabria, as well as modelled the pressure–temperature–deformation (P–T–d) trajectory of a main ductile shear zone that tectonically coupled the deeper crustal Mammola Paragneiss Unit with the upper crustal Stilo–Pazzano Phyllite Unit. P–T modelling of the mylonitic Mammola Paragneiss Unit was performed through calculation of phase equilibrium diagrams with the software thermocalc in the MnNCKFMASHTO model system. The prograde P–T–d trajectory is based on the zoning profiles of garnet porphyroblasts and their mineral inclusions, primarily barroisite and epidote. P–T modelling shows that peak metamorphic conditions of ~0.9 GPa and 585°C were reached during a Dn‐1 under‐thrusting event. The following exhumation during the Dn mylonitic event, and contact metamorphism during Dn+1 and Dn+2 folding events, have also been modelled because they are essential to restore the previous tectono‐metamorphic history. The exhumation trajectory was modelled down to 0.3 GPa with temperatures of 440–460°C, under fluid‐deficient conditions, as well as the final late Carboniferous contact metamorphism up to Tmax of 680–720°C. The prograde path shows clear evidence for thermal buffering during garnet growth at the expense of chlorite, with a heating‐dominated stage after chlorite breakdown. Subsequently, a rheological change associated with epidote breakdown (i.e. reaction softening) occurred, highlighted by a net steepening of the P/T trajectory towards the pressure peak. On the basis of the barroisite inclusions within garnet porphyroblasts as well as the ‘hairpin’ shape of the reconstructed P–T–d path (before contact metamorphism), we infer that the unusual low T/P gradient for the Hercynian crust exposed in the Mammola Paragneiss Unit records its involvement in the Palaeotethys–Gondwana subduction beneath Laurussia during Dn‐1 under‐thrusting. We present a new palaeotectonic interpretation along the southern Hercynian belt in Calabria during the Upper Mississippian–Lower Pennsylvanian, that is consistent with previous geochronology studies.

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Section: Metamorphic Evolution Of the Mammola Paragneiss Unitmentioning

confidence: 99%

Hercynian subduction‐related processes within the metamorphic continental crust in Calabria (southern Italy)

Tursi

Spiess

Festa

et al. 2020

Journal Metamorphic Geology

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“…(3) jadeite-quartz-glaucophane rock from Luk Ulo Complex (Miyazaki et al, 1998); (4) eclogite from Bantimala Complex (Setiawan et al, 2016); (5) garnet bg. epidote-barroisite schist from Meratus Complex (Setiawan et al, 2015); (6) garnet amphibolite from Luk Ulo Complex (this study); (7) garnet-biotite-muscovite schist from Barru Complex (Setiawan et al, 2014). Explanations of petrogenetic grids see Figure 6a.…”

Section: Discussionmentioning

confidence: 85%

“…However, these types of rock are recognized in other metamorphic complexes in South Sulawesi namely as Barru (garnet-biotite-muscovite schist; Setiawan et al, 2014) and Biru Complexes (epidote-garnet amphibolite; Jaya et al, 2017). In the Meratus Complex, this type of rock is represented by garnet-bearing epidote-barroisite schist (Setiawan et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

“…High-pressure/low-temperature (HP/LT) metamorphic rocks (blueschist-and eclogitefacies) record subduction processes and provide geodynamic evolution of convergent plate boundaries. Those rocks are exposed in Central Indonesian Accretionary Collision Complex (CIACC; Kadarusman et al, 2007;Figure 1a) region, particularly in Luk-Ulo (Central Java), Bantimala (South Sulawesi), and Meratus (South Kalimantan) Complexes Parkinson et al, 1998;Kadarusman et al, 2007;Setiawan et al, 2015;Setiawan et al, 2016). Recent Rb-Sr geochronological studies of various metamorphic rocks from these areas yielded Early Cretaceous ages (130 -120 Ma in South Sulawesi and 119 -117 Ma in Central Java; Hoffman et al, 2019; Böhnke et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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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

Osanai

Nakano

et al. 2020

Indonesian J. Geosci.

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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).

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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. The research (Chen et al, 2018) investigated the metamorphic rocks in Wuliangshan Mountains with the facies and metamorphism types.…”

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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Metamorphic Evolution of Garnet-bearing Epidote-Barroisite Schist from the Meratus Complex in South Kalimantan, Indonesia

Cited by 16 publications

References 23 publications

Hercynian subduction‐related processes within the metamorphic continental crust in Calabria (southern Italy)

Hercynian subduction‐related processes within the metamorphic continental crust in Calabria (southern Italy)

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

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

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