SEPARATION MECHANISM AND TECTONOSTRATIGRAPHY OF SOUTH MAKASSAR BASIN, SOUTH SULAWESI
South Makassar Basin (SMB) is an offshore basin located at southern part area between Kalimantan Island and Sulawesi Island. This basin has been explored for a long time, but until now does not resulting any satisfying discovery. The research conducted to know separation mechanism at SMB whether...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/41501 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | South Makassar Basin (SMB) is an offshore basin located at southern part area
between Kalimantan Island and Sulawesi Island. This basin has been explored for
a long time, but until now does not resulting any satisfying discovery. The
research conducted to know separation mechanism at SMB whether by strike-slip
or by rifting, and to know its tectonostratigraphy.
To answer the objectives of the research, primary data consisted of seismic and
well data, also secondary data consisted of bathymetry map, elevation model map,
and bouger anomaly map has been used. The methods used in this research are:
analyzing time structure section, making of time structure map, making isochron
map, analyzing depositional environment, analyzing trend of the faults, and also
palinspastic reconstruction.
Interpretation of time structure sections showed that developed structures in SMB
are normal faults, thrust faults, inversion faults, and folds. Time structure map of
basement showed there are two trends of fault alignments developed: NW – SE
trend and NE – SW trend. The form of normal faults, the trend of basement faults
that dominated by NE – SW, also with alignment trend on bouger anomali map
indicating that separation mechanism of SMB is rifting related with principal
direction of separation NW – SE. The asymetric geometry of normal faults also
with palinspastic reconstructions showed that SMB has simple shear separation
model. Interpretation of seismic reflectors and strain analysis from palinspastic
reconstructions showed there are three tectonic phases in SMB: rifting phase,
sagging phase, and inversion phase. Tectonostratigraphy of SMB can be divided
into four units: Pre-rift Unit, Syn-rift Unit, Post-rift Unit, and Syn-inversion Unit. |
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