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Surono Surono
Pusat Survei Geologi
Chemistry Earth & Planetary Sciences Energy

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POLA DAN GENESA STRUKTUR GEOLOGI PEGUNUNGAN SELATAN, PROVINSI DAERAH ISTIMEWA YOGYAKARTA DAN PROVINSI JAWA TENGAH C. Prasetyadi; Ign Sudarno; VB. Indranadi; Surono Surono
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 2 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i2.138

Abstract

The geological structures in the study area are dominated by faults. The rest directions of the faults are northeast-southwest (16 faults) and north-south (14 faults). The remainder of faults are trending in northwest-southeast (3 faults) and west-east (3 faults) directions. Generally, the northeast-southwest and north-south trending faults are dominated by sinitral faults and a few of them are reactivated as normal faults. Whereas the northwest-southeast and west-east trending faults are mainly dextral and or normal faults.Key words: fault, sinitral, normal, and lineament
TEKTONO-STRATIGRAFI BAGIAN TIMUR SULAWESI Hermes Panggabean; Surono Surono
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 5 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i5.150

Abstract

Basement rocks of eastern part of Sulawesi, from the East Arm to Southeast Arm, are composed of continental and ophiolite origins, which were collided in latest Oligocene – Middle Miocene. After collision, extention occurred in the area that formed a deepening basin in where Sulawesi Molasse was deposited. Some continental terranes distributed in the eastern Sulawesi, could be derived from northern magin of Australia, and the ophiolite was a part of the Pacific Ocean.Key words: ofiolite, continental terrane, collision and basin
LITOSTRATIGRAFI PEGUNUNGAN SELATAN BAGIAN TIMUR DAERAH ISTIMEWA YOGYAKARTA DAN JAWA TENGAH Surono Surono
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 3 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i3.206

Abstract

the central part of the Southern Montains, which extends east-west from Parangtritis (Yogyakarta) to Baturetno Plain (Wonogiri, Central Jawa), is typically formed by clastic and carbonate sediments with volcanic rocks. Volcanic activities had been very intensive during Late Oligocene - Early Miocene. Based on their lithologies, the Southern Montains can be divided into: pra-volcanic, volcanic and postvolcanic (carbonate) periods. The rocks formed during pre-volcanic period are as the basement of the rocks which were formed during the volcanic period. Results geological mapping/study in this Southern Montains are pesented in this paper, e.g. similar formations can be divided into smaller lithologic unit, therefore the formations can be proposed into groups. Key words: Southern Montains, lithostragraphy, volcanism period, basement rocks
SEDIMENTASI FORMASI SEMILIR DI DESA SENDANG, WURYANTORO, WONOGIRI, JAWA TENGAH Surono Surono
Jurnal Geologi dan Sumberdaya Mineral Vol. 18 No. 1 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v18i1.225

Abstract

Semilir Formation crops out widely along the Southern Mountains, the southern part of Central Jawa. This formation plays an important role in both stratigraphy and magmatism of the area. The formation is conformably underlain by turbidite-dominated sediments of Kebo Butak Formation and the upper part is overlain by the volcanic breccia of Nglanggran Formation. On the basis of lithological variation, the Semilir Formation can be distinguished into four units: sandstone, lapilli tuff, pumice breccia and andesitic pumice breccia.  Calcareous clay within the sandstone unit contains nannofossils which indicate an Early Miocene age. On the other hand, fission track datings of zircon, which is contained in the pumice of the pumice breccia facies, have resulted in the ages of 17.0 + 0 Ma and 16.0 + 1.0 Ma or latest Early Miocene.The depositional environments of the formation indicate a shallowing upward sequence, and volcanism was very active during the deposition of the upper part of the formation. The pumice breccia and andesitic pumice breccia units were deposited in a relatively short time. Keywords: age, stratigraphy, lithologic unit, fission track
Co-Authors C. Prasetyadi Hermes Panggabean Ign Sudarno VB. Indranadi