STUDY OF PETROGENESIS AND MINERALIZATION OF ULTRAMAFIC COMPLEX ROCK OF SOPURA, DISTRICT OF KOLAKA, SOUTH EAST SULAWESI
The Utramafic complex in Sopura area, Kolaka, Southeast Sulawesi is part of the East Sulawesi Ophiolite (ESO). The study of petrogenesis and mineralization conducted in this study used the analysis method of rocks magnetic susceptibility, petrography, and mineragraphy. The result of geological ma...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/69805 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The Utramafic complex in Sopura area, Kolaka, Southeast Sulawesi is part of the
East Sulawesi Ophiolite (ESO). The study of petrogenesis and mineralization
conducted in this study used the analysis method of rocks magnetic susceptibility,
petrography, and mineragraphy. The result of geological mapping and
petrographic analysis, Ultramafic Complex in Sopura region is divided into three
units of rocks i.e. units of Hazburgit, Lerzolit, and Gabro.
The environment of ultramafic rock formation in the study area through
serpentine vein analysis and phase diagram of An-Di-Fo with 15 kbar of pressure
on Lerzolite showed that the magma affinity was derived from the basal of the
Mid Oceanic Ridge Basalt with the overhead of the Thetyan type. The study area
is included part of an incomplete/dismembered ophiolite type ophiolit which was
obducted above the continents. Contact between the sequences ofiolit is in the
form of fault. The result of correlation with the ophiolit in the world is equated
with the ofiolit Pindos, Greece.
Measurements of rocks magnetic susceptibility obtained high magnetic
susceptibility values in 7.88 x 10-3 SI of the serpentized Harzburgite rock units
and 9.754 x 10-3 SI of Serpentinite and increased to the west-northwest direction.
It is influenced by a fairly strong degree of serpentinization. The comparison
between magnetic susceptibility analysis and mineragraphy analysis showed that
the direction of chromite ore distribution also increased to that direction. Chromite
sediment characteristic is chromite podiform type, including class II chromite type
with deformed, non-cumulate chromite features, spreading disseminated to
massive with strong deformation features, original rocks of Harzburgite. |
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