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Kusnama Kusnama
Pusat Survei Geologi
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STRATIGRAFI DAERAH TIMIKA DAN SEKITARNYA, PAPUA Kusnama Kusnama
Jurnal Geologi dan Sumberdaya Mineral Vol. 18 No. 4 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v18i4.244

Abstract

The rocks succession exposed in the Timika area, Papua, have an age ranging from Precambrian to Quaternary. The oldest rock is the Nerewip Formation consisting of  pillow lava and basalt intercalated with foliated meta-sedimentary rocks and overlies unconformably and paraconformably by the Otomona Formation which is dominated by slate and sandstone and also metamorphosed of Precambrian-Cambrian in age. On top of the Otomona Formation is overlain unconformably the Tuaba Formation which consists mainly of sandstone, and red mudstone in the upper part. The age of this formation is not younger than Ordovician. The Siluro-Devonian Modio Formation comprises predominantly dolomite and minor clastic sediments lying disconformably on the Tuaba Formation. The overlying coarser upward sequence Aiduna Formation with a shallow marine to deltaic environment, overlies unconformably the Modio Formation consisting of alternating of sandstone and carbonaceous mudstone, intercalated by bio-calcarenite and coal beds, probably of Permian in age. On top of  this formation was conformably deposited the red beds Tipuma Formation of a terrestrial origin. The age of the formation is thought to be Triassic to Early Jurassic. The Kembelangan Group of Middle Jurassic to Late Cretaceous comprises of intercalating of quartz sandstone and mudstone which are rich in ammonite fossils overlies unconformably the Tipuma Formation. The Tertiary sequence which is dominated by carbonate platform having rich in large foraminifera of the New Guinea Limestone Group lying conformably on the Kembelangan Group. The age of this group is Paleocene to Early Miocene. The Late Miocene to Pliocene Buru Formation consist of alternating of sandstone and mudstone overlying conformably the Nugini Limestone Group. The Diorite intrusion in this unit in Late Tertiary resulted a favourable Au/Cu mineralization in the formation, in north of Timika (the Central Range of Papua). The Quaternary deposits are widespread in the southern part of south Timika area. Keywords : Papua, Timika, Stratigraphy, Diorite intrusion, Precambrium,Paleozoic, Mesozoic, and Tertiary
HUBUNGAN LINGKUNGAN PENGENDAPAN FORMASI MALAWA DAN KETERDAPATAN BATUBARA DI DAERAH SOPPENG, SULAWESI SELATAN Kusnama Kusnama; Syahrir Andi Mangga
Jurnal Geologi dan Sumberdaya Mineral Vol. 17 No. 4 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v17i4.291

Abstract

Lithologically, the Malawa Formation comprises medium to coarse-grained quartz sandstone, shale and claystone in the lower part; and mudstone and carbonaceous fine- grained sandstone in the upper part. The thickness of the Malawa Formation in the Gatareng area is about 100 metres. The lower part of the Malawa Formation was deposited in a fluvial environment occupied by terrestrial vegetation such as land algae, fungus, ferns and mangroves, while the upper part of the formation was indicated by fluviatile close to the beach and sand dunes. On the basis of fossil content, the age of the formation is within the range of Middle Eocene -Oligocene.Several coal intercalations which are characteristically black in colour with good luster of sub-bituminous, were found in the formation with the thickness from 50 cm to 120 cm. Based on the lithology succession and the river stream where the coal deposits were found, coal occurred in the Malawa Formation can be divided into two blocks, Bakeko and Kandangsapi Blocks. Each block has some coal seams with different various rock succession. Keywords: Malawa Formation, Gatareng Area, sub-bituminous, beach environment
PERKEMBANGAN GEOLOGI DAN TEKTONIK PRATERSIER PADA MINTAKAT KUANTAN PEGUNUNGAN DUA BELAS DAN MINTAKAT GUMAI-GARBA, SUMATERA BAGIAN SELATAN Kusnama Kusnama; Syahrir Andi Mangga
Jurnal Geologi dan Sumberdaya Mineral Vol. 17 No. 6 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v17i6.315

Abstract

The configuration of the pre-Tertiary tectonic and stratigraphic developments of the Southern Sumatera has been an interesting problem for many years.  Many geologists have used various concepts in solving the geological problem in order to reconstruct the geological setting of Sumatera and the related surrounding areas.The pre-Tertiary  basement in Sumatera  comprise allochtonous rocks consisting of many terrains which are composed of various lithologies of different age sand historical backgrounds   and they are separated each other by tectonic sutures.The Kuantan-Duabelas   Mountain Terrain is occupied by metamorphic, sedimentary and volcanic rocks of Paleozoic-Mesozoic (Carboniferous - Triassic) age and are intruded by the Mesozoic granitoid rocks.  The terrain occurred in the western part of Sumatera. Meanwhile, the Gumai-Garba   Terrain  which is occupied by the tectonite/ melanee,  metasediment,   carbonate  and  volcanic  rocks of Mesozoic (Jurassic  -  Cretaceous)   age are  intruded  by the  Late Cretaceous granitoid rocks. Keywords: pre-tertiary, tectonic, terrain, Southern Sumatera
Co-Authors Syahrir Andi Mangga