tektono-stratigrafi bagian timur sulawesi

GEOLOGI BAGIAN TIMUR SULAWESI
HUBUNGANNYA TERHADAP SUMBERDAYA GEOLOGI
UMS 30 MEI 2012
Surono
BADAN GEOLOGI, KESDM
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OUTLINE
 INTRODUCTION
 REGIONAL GEOLOGY
 EASTER SULAWESI
 CONTINENTAL TERRANES
 OPHIOLITE
GEOLOGICAL RESOURCES
 CONCLUSIONS
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EURASIA
PLATE
PASIFIC
PLATE
HINDIA- AUSTRALIA PLATE
SULAWESI IS LOCATED IN A COLLISION ZONE BETWEEN 3 PLATES
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INTRODUCTION
TOPOGRAPHY AND
BATIMETRY OF SULAWESI
AND SURROUNDING AREA
SRTM 30 Grid 1000 meter
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MORPHOLOGICAL FEATURE OF THE NECK OF SULAWESI FROM IFSAR IMAGERY
(Surono, 2010)
ANALISA MORFOLOGI LENGAN TENGGARA SULAWESI
(Surono, 2010)
GRAVITY
SULAWESI AND SURROUNDING AREA
ON TOPOGRAPHY AND BATIMETRY MAPS
GEOLOGICAL AGENCY
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MAJOR STRUCTURES
SULAWESI AND
SURROUNDING AREA
(modified from Silver et al., 1983
dan Rehault et al., 1991 by
Surono et al.,1997).
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PEMBAGIAN MENDALA
GEOLOGI P. SULAWESI
(Sukamto, 1975 dimodifikasi
Oleh Surono, 1996).
EASTERN SULAWESI
(SIMPLIFIED FROM GEOLOGICAL
PUBLISHED BY GRDC)
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EASTERN SULAWESI
CONTINENTAL
TERRANES IN
EASTERN SULAWESI
(Surono, 1996)
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EASTERN SULAWESI
TEKTONOSTRATIGRAPHY OF
EASTERN SULAWESI
3 MAJOR GROUPS OF ROCKS:
1. CONTINENTAL TERRANE
2. OCEANIC TERRANE
3. SULAWESI MOLASSE
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SIMPLIFIED
TECTONOSTRATIGRAPHY OF THE EASTERN SULAWESI
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PRE-COLLISION
MELUHU FORMATION,
(SE SULAWESI CONTINENTAL TERRANE)
As deepening sediments (river deposits to be shallow
water sediments upwards), Late Triassic
Pmag analysis: sample taken from 3,5o S resulted 20o S
(about 453,75 km away from present position) and
rotated 25o clockwise. It is similar to northern margin
of Australia.
Moving rate is about 3,7 cm/year
This basin was deepening (to be deep basin) until
Cretaceous
PRE-COLLISION
OPHIOLITE
Ophiolite suite: mafic and ultra mafic rocks covered
by deep sea sediments in places (CretaceousEocene)
Pmag analysis: formed at 17o – 42o S (Mubroto,
1988), derived 1138,5 km from present position.
Moving rate 3,7 – 9,3 cm/year
POST-COLLISION
Extension ----block faulting
Sulawesi Molasse: clastic-carbonate sediments,
deposited in isolated basin - shallow marine
Age: Early Miosen - Pliosen
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SUMBER DAYA GEOLOGI
PADA KEPINGAN BENUA
MINYAK DAN GAS BUMI
Batuan induk (source rock):
sedimen Mesozoikum dan
Molasa Sulawesi (?)
Batuan waduk (reservoir
rock):
sedimen Mesozoikum dan
Molasa Sulawesi
Batuan tudung (seal rock):
sedimen Mesozoikum dan
Molasa Sulawesi
MINERAL LOGAM
EMAS DAN TEMBAGA
Emas sebagai endapan
sekunder dalam Molasa
Sulawesi
Mineralisasi pada batuan
metamorf sebagai oroginic
gold deposits
BOMBANA, 1999
KERUSAKAN LAHAN AKIBAT PENAMBANGAN TRADISIOLNIL TAK TERKENDALI
BATUAI
LOCATIONS OF PLACER
GOLD DEPOSITS
Placer gold deposit
within Quaternary sediments
KASIPUTIH
(Simplified from GRDC’s maps)
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LOCATION OF PLACER GOLD DEPOSITS
IN THE SOUTHEAST ARM OF SULAWESI
Simandjuntak et al., 1992
Tmpb: Boepinang Formation
Tmpe: Eemoiko Formation
Tmls : Sandstone Member
Langkowala Formation
Tmlc : Conglomerate Member
Langkowala Formation
Km : Metalimestone
Tmpm: Metamorphics
Ku
: Ophiolite Qa : Alluvium
LANDSAT IMAGERY
OF LANGKOWALA
AREA
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Nickel and iron locations in Southeast Sulawesi
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HYDROCARBON POTENCIAL IN SULAWESI
(Jablonski et al., 2007 in Setyana, 2011)
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SUMBER DAYA GEOLOGI
PADA KEPINGAN SAMUDRA
NIKEL
Sebagai hasil pelpukan dan pengakayan batuan
ofiolit, yang tersebar di bagian timur Sulawesi
dan beberapa pulau di sekitarnya.
KROM
Sebagai hasil pelapukan ofiolit yang diendapkan
kembali pada endapan Kuarter
PLATINA
Umumnya ditemukan sebagai endapan sekunder
pada sedimen halus Molasa Sulawesi dan
sedimen Kuarter
KEBENCANAAN
 Bagian timur P. Sulawesi dibentuk oleh batuan ofiolit
dan kepingan benua yang aktif bertabrakan
 Sesar aktif regional di antaranya: Sesar Lawanopo,
Sesar Konaweha, dan Sesar Kolaka.
 Kegempaan, tsunami, gerakan tanah & banjir sangat
mungkin terjadi di sepanjang sesar aktif dan daerah
sekitarnya.
STRUKTUR UTAMA
DAN BATIMETRI
SESAR AKTIF
(dimodifikasi dari Silver drr., 1983
dan Rehault drr., 1991 oleh
Surono drr., 1997).
DAMPAK SESAR AKTIF
•
•
•
•
CONCLUSION
 Eastern Sulawesi composed by continental and
oceanic terranes covered by Sulawesi Molasse
 Continental terrane collided with oceanic terrane
during latest Oligocene – Middle Miocene times
 Primary metallic mineral (gold) could be found within
continental terrane
 Nickel in ophiolite suite
 Hydrocarbon potential in continental terrane
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UN SHINE AT THE LUWUK BEACH
MATUR NUWUN
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