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Sigit Maryanto -, Sigit Maryanto
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Environmental Science

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DISTRIBUSI UKURAN BUTIR MATRIKS BREKSI GUNUNGAPI DI DAERAH LOMBOK TIMUR, NUSA TENGGARA BARAT -, Sigit Maryanto
Bulletin of Scientific Contribution Vol 7, No 1 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2787.912 KB) | DOI: 10.24198/bsc.v7i1.8233

Abstract

Volcanic rock units of the Kalipalung, Kalibabak, and Lekopiko Formations are well cropped out at East Lombok area, composed predominantly of volcanic breccias. Grainsize analysis of selected volcanic breccias matrix show a similarity characters on the Kalipalung and Kalibabak Formation. On the other hand, a real difference founded between these formations with the Lekopiko Formation.
HUBUNGAN ANTAR KOMPONEN MIKROFASIES LERENG TERUMBU DAN CEKUNGAN LOKAL BELAKANG TERUMBU PADA BATUGAMPING BIOKLASTIKA FORMASI BATURAJA DI DAERAH SEKITAR MUARADUA, SUMATERA SELATAN -, Sigit Maryanto
Bulletin of Scientific Contribution Vol 8, No 1 (2010): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1460.087 KB) | DOI: 10.24198/bsc.v8i1.8240

Abstract

Bioclastic limestones from Baturaja Formation cropped out at Muaradua area, South Sumatera is a good object of research for studying microfacies of limestone. Based on the rock features under the polarization microscope of the bioclastic limestones taking from studied area could be predicted the limestones are predominantly deposited at reef-flank and back-reef local basin. The main components T-F-P test of the limestones showing a significant difference of the carbonate grains, terrigenous grains, and neomorphism materials between two depositional environments. The other side, matrix, cement, and rock porosity components have no significant difference.
DIAGENESIS DAN BATUAN SUMBER BATUPASIR FORMASI LATI DI DAERAH BERAU, KALIMANTAN TIMUR, BERDASARKAN DATA PETROGRAFI -, Sigit Maryanto
Bulletin of Scientific Contribution Vol 7, No 2 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1621.19 KB) | DOI: 10.24198/bsc.v7i2.8237

Abstract

Petrography analysis result of twenty two sandstones of the Lati Formation were taken from Berau area, East Kalimantan showing that these rocks classified as litharenite, feldspathic litharenite, sublitharenite, feldspathic wacke, and lithic wacke witch are partially calcareous. Diagenetic processes visible on the petrographic analysis including as replacement, dolomitization, cementation, and compaction. Plotting result on the triangular diagrams showing that the provenance of the sandstones are dominated by granitic rocks initiated from tectonic setting of rifted continental margin and they have transported toward south-east.
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