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All Journal Buletin Sumber Daya Geologi Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Sigit Maryanto
Pusat Survei Geologi
Chemistry Earth & Planetary Sciences Education Energy Engineering Environmental Science

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MINERALOGI MATRIKS BREKSI GUNUNG API PLISTOSEN AKHIR – KUARTER BERDASARKAN DATA XRD DI DAERAH LOMBOK TIMUR, NUSA TENGGARA BARAT Sigit Maryanto; R. Hasan; Darwin A Siregar
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 1 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i1.189

Abstract

Late Pleistocene to Quarternary volcanic rock units of the Kalipalung, Kalibabak, and Lekopiko Formations are well cropped out at East Lombok area, composed predominantly of volcanic breccias. The volcanic breccia of the Kalipalung Formation composed of andesite, porphyry andesite, basaltic andesite, basalt, and altered igneous rocks fragments. The frequence of the occurrence of the andesites and basalts is balanced. The volcanic breccia of the Kalibabak Formation composed predominantly of andesite, porphyry andesite, and rarely basaltic andesite and basalt rock fragments. The volcanic breccia of the Lekopiko Formation composed predominantly of pumice and less of andesite rock fragments, as well as sand and conglomeratic sands. XRD analysis of selected volcanic breccias matrix shows that the plagioclase change from labradorite and andesine on the Kalipalung and Kalibabak Formation to andesine, oligoclase and albite on the Lekopiko Formation. From the old to young formations, the orthopyroxene and clinopyroxene change to orthopyroxene, and finally these minerals was dissapeared. The clay minerals of montmorilonite commomly preserved on the old formation, it dissapeared and replaced by kaolinite in the young formation. Based on the difference test between two means it appears that the Kalipalung and Kalibabak Formations are similar on their mineralogical characters. On the other hand, the Kalipalung Formatian has a real difference on the mineralogical character with the Lekopiko Formation, as well as the Kalibabak Formation with the Lekopiko Formations. Keywords: Earth Lombok, breccias matrix, mineralogy
HUBUNGAN ANTARKOMPONEN MIKROFASIES LERENG TERUMBU OAN CEKUNGAN LOKAL TERUMBU BELAKANG BATUGAMPING BIOKLASTIKA FORMASI BATURAJA 01 OAERAH SEKITAR MUARAOUA, SUMATERA SELATAN sigit Maryanto
Jurnal Geologi dan Sumberdaya Mineral Vol. 18 No. 2 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v18i2.242

Abstract

Bioclastic limestone of the Baturaja Formation cropping out in the Muaradua area, South Sumatera, is a good research object for microfacies analysis. Polarized microscopic study has revealed that the, bioclastic, limestones are predominantly reef-flank and local back-reef basin deposits. The results of T, F, and P tests of the limestones show a significant difference in their carbonate and terrigenous grains, as well as in their neomorphic materials between the deposits. On the other hand, their matrices, cements, and porosities are of no significant difference. Keywords: reef-flank, back-reef, carbonate grains, petrography
PETROGRAFI DAN PROSES DIAGENESIS BATUGAMPING FORMASI BATURAJA DI LINTASAN AIR SAKA, OKU SELATAN, SUMATERA SELATAN sigit Maryanto
Jurnal Geologi dan Sumberdaya Mineral Vol. 17 No. 1 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v17i1.276

Abstract

The Early Miocene limestone  of  Baturaja Formation crops out along the Air Saka Section, having a measured  thickness  of 247 metres. This carbonate  formation  lies conformabty  on the siliciclastic  sediments  of Talangakar Formation, and it is in turn, conformably   overlain  by the silicidastic  sediments   of Gumai  Formation.  The limestone was affected  by several diagenetic processes, such as bioturbation,   fossil cavity filling,  replacement,  cementation, recrystallization, micritization, dolomitization,  authigenic-mineral  formation, compaction,   dissofution,   stylolitization, and fracturing.  Some  of these diagenetic processes have a very weak to moderate coeficient  of interrelationship. Keywords:Petrography, carbonate grains, cementation, meteoric, statistical test
Mineralogi dan Geokimia Tuf Berumur Tersier dan Kuarter di Daerah Cibadak, Sukabumi, Jawa Barat Sam Permanadewi; Sigit Maryanto; Joko Subandrio
Jurnal Geologi dan Sumberdaya Mineral Vol. 18 No. 4 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v18i4.295

Abstract

Fine-grained pyroclastic rocks  found in the Cibadak area, Sukabumi divided into two groups, namely Tertiary tuff composing of Jampang Formation and Quarternary tuff as the result of  young volcanic eruptions. The relationship between mineralogy and geochemistry of those tuffs are discussed in this paper. Laboratory testing was conducted on fifty rock samples taken from the field. A kind of mineralogy composing the rock can be identified by the XRD (X-Ray Diffraction) mineralogy test, while the major oxide of the rock can be calculated with the XRF (X-Ray Fluorescence) geochemistry test. The XRD mineralogy test shows  two secondary mineral that becomes the differentiation between the two tuffs are zeolites and clay minerals. The zeolites present at most of the Tertiary tuffs as a result of the rock alteration which involves an increasing in formation temperature and pressure. Clay minerals are mostly present at the Quarternary tuffs as a result of rock wheathering on the surface. The zeolite and clay minerals are associated with almost all chemical oxides of the rocks. The chemical oxides including SiO2, Al2O3, Fe2O3, MgO, K2O, TiO, and MnO. The XRF rock-chemically characters show there are no differences of the chemical oxide components on both of these pyroclastic rock groups. Keywords: mineralogy, geochemistry, tuff, Tertiary, Quarternary.
Aspek Petrografi Batugamping di Daerah Timor Tengah Selatan Sigit Maryanto; Asep Kurnia Permana; Joko Wahyudiono
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 2 (2018): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i2.396

Abstract

Microfacies and diagenetic aspects of limestones in the South Central Timor, East Nusa Tenggara have studied to investigate the deposition mechanism of the rocks and history of geological process after the rocks deposition. The cropped out of limestones in the research area includes into four rock units, are Aitutu Formation from Triassic, Nakfunu Formation from Early Cretaceous, Menu Formation from Late Cretaceous, and Ofu Formation from Paleogene. Limestone petrography analysis have been done on eighteen samples from the Aitutu Formation, fourty two samples from the Nakfunu Formation, nineteen samples from the Menu Formation, and seven samples from the Ofu Formation. Based on the study of limestones mikrofasies and diagenesis that has been done, proved are the fourth formation could be act as a source and reservoir for hydrocarbon. Keywords: Limestone, petrography, microfacies, diagenetic, hydrocarbon
Sedimentologi Batugamping Formasi Jayapura di Sepanjang Lintasan Dewarebru, Mamei-Waibron, Jayapura Sigit Maryanto; Dian Hari Saputra; Sonia Rijani; M Luthfi Faturrakhman
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 2 (2020): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i2.506

Abstract

The Pleistocene of the Jayapura Formation limestones well cropped out at Dewarebru Section, Mamey-Waybron, Jayapura Regency. Detailed descriptions of rock outcrops and petrography analysis of selected limestone samples is used to find out the limestone sedimentology characters. This Jayapura limestone was divided onto four limestone facies, including lithoclastic rudstone, bioclastic packstone, bioclastic grainstone and bioclastic wackesone rock facies. The rocks was deposited in a fore slope talus forming submarine alluvial fan, furthermore the rocks was deposited in a local slope on the back reef environment.Keywords: Limestone, petrography, stratigraphy, sedimentology, Jayapura
Co-Authors Asep Kurnia Permana Darwin A Siregar Dian Hari Saputra Joko Subandrio Joko Wahyudiono Kusdji Darwin Kusumah M Luthfi Faturrakhman R. Hasan Ronaldo Irzon Sam Permanadewi Sonia Rijani