Journal of Applied Geology
Vol 6, No 2 (2014)

METAMORPHIC EVOLUTION OF GARNET–BIOTITE–MUSCOVITE SCHIST FROM BARRU COMPLEX IN SOUTH SULAWESI, INDONESIA

Nugroho Imam Setiawan (Geological Engineering Department, Faculty of Engineering, Universitas Gadjah Mada)
Yasuhito Osanai (Division of Earth Sciences, Faculty of Social and Cultural Studies, Kyushu University)
Nobuhiko Nakano (Division of Earth Sciences, Faculty of Social and Cultural Studies, Kyushu University)
Tatsuro Adachi (Division of Earth Sciences, Faculty of Social and Cultural Studies, Kyushu University)



Article Info

Publish Date
02 Sep 2015

Abstract

This paper explains the first report in metamorphic evolution of pelitic schist from Barru Complex in South Sulawesi, Indonesia. Garnet-biotitemuscovite schist was examined petrologically to assess the metamorphic evolution history, which has implications on tectonic condition of this region. The rock mainly composed of garnet, biotite, muscovite, epidote, quartz, rutile, hematite, and plagioclase. Inclusions in the garnet preserve records of prograde stage of this rock, which are epidote, titanite, quartz, and apatite. Garnet, biotite, muscovite, quartz, rutile, and plagioclase are concluded as equilibrium assemblages at peak P-T condition of this rock, which estimated at 501–562 ºC and 0.89–0.97 GPa. The result is still on the ranges of the estimated geothermal gradient P-T path of eclogite from Bantimala Complex. Similar geothermal gradients of metamorphisms might be indicated that these metamorphic rocks were metamorphosed on the similar tectonic environments. Keywords: Pelitic schist, Barru Complex, South Sulawesi, metamorphic evolution.

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Journal Info

Abbrev

jag

Publisher

Subject

Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science

Description

Journal of Applied Geology – JAG focuses on the applied geology and geosciences with its key objective particularly emphasis on application of basic geological knowledge for addressing environmental, engineering, and geo-hazards problems. The subject covers variety of topics including geodynamics, ...