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All Journal IJOG : Indonesian Journal on Geoscience Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Buletin Sumber Daya Geologi Journal Education and Government Wiyata

Sigit Maryanto

Centre for Geological Survey, Geological Agency Jln. Diponegoro No. 57, Bandung 40122

Author-ID : 316942

Earth & Planetary Sciences Education Energy Engineering Environmental Science Social Sciences Other

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Pendolomitan Batugamping Formasi Rajamandala di Lintasan Gua Pawon, Bandung Barat Maryanto, Sigit
Indonesian Journal on Geoscience Vol 4, No 3 (2009)
Publisher : Geological Agency

http://dx.doi.org/10.17014/ijog.vol4no3.20095Diagenetic process records could be observed based on the petrography and XRD mineralogy labo- ratory analyses from thirty-two samples of limestone taken from the Rajamandala Formation at Pawon Cave Section, West Bandung. These laboratory analyses show that the rocks have partially been affected by a dolomitization. The dolomitization recorded at the limestone is a fabric selective dolomitization of the rock matrix, continued to the whole components of the limestone. The dolomite crystals are generally idiotopic to xenotopic mosaic rhombohedral in shapes with fine to moderate crystal sizes. Dolomite mainly consists of magnesium ion initiated from water formation trapped soon after the rock deposited. The middle part of the Rajamandala Formation, which is commonly affected by dolomitization is generally associated with meteoric water dissolution and creates several caves. Â

Limestone Microfacies of Baturaja Formation along Air Rambangnia Traverse, South OKU, South Sumatra Maryanto, Sigit
Indonesian Journal on Geoscience Vol 1, No 1 (2014)
Publisher : Geological Agency

DOI:Â 10.17014/ijog.v1i1.173Limestones of the Baturaja Formation occur at Air Rambangnia traverse, South Ogan Komering Ulu, South Sumatra, and they are used as objects for microfacies studies. The microfacies studies are based on a detailed petroÂgraphic analysis of thirty four limestone samples, taken from the traverse. Four types of the limestones are identified such as wackestone, packstone, grainstone, and floatstone. At least five microfacies form the limestone succesion of the Baturaja Formation. They are interpreted as sedimentary facies of very restricted bay and pond, back reef local slope, slope and shelf edge, winnowed platform edge sand, and reef flank facies. Â

Regression-Correlation of Petrophysical Inter-Parameter of Igneous Rocks and Limestone from Kulonprogo Mountain Region, Yogyakarta Special Region Maryanto, Sigit; Hasan, R.
Indonesian Journal on Geoscience Vol 6, No 4 (2011)
Publisher : Geological Agency

DOI:Â 10.17014/ijog.v6i4.127Laboratory test of complete petrophysic parameters encompasing water absorption, compressive strength, Los Angeles abrasive strength, Rudellof abrasive strength, and wear resistance with Na2SO4 has been carried out for igneous and carbonate rocks taken from Kulonprogo Mountains region. Statistical verification of the data exhibits variation of correlation coefficients among parameters ranging from medium to very high value. The values of petrophysic test results are determined by the rock types. The result of this study is useful to estimate the accuracy of values of each parameter test result in Geological Survey Institute Laboratory using regression formula representing each relationship.

Limestone Diagenetic Records Based on Petrographic Data of Sentolo Formation at Hargorejo Traverse, Kokap, Kulonprogo Maryanto, Sigit
Indonesian Journal on Geoscience Vol 7, No 2 (2012)
Publisher : Geological Agency

DOI:Â 10.17014/ijog.v7i2.138Limestone diagenetic records of Sentolo Formation have been studied in order to trace the history of the geological processes after the deposition of the rocks. A stratigraphic measure traverse was made in Hargorejo Village, Kulonprogo District, to identify the petrological characteristics of the Sentolo Formation. LimestoneÂ samples were taken along this traverse, and were used for a petrographic analysis. The analysis of thirtyeight limestone samples shows that the type is dominated by bioclastic grainstones which have been affected by various kinds of diagenetic processes after the deposition. The diagenetic processes recorded under theÂ polarization microscope include cementation, replacement, bioturbation, micritization, recrystallization, dolomitization, compaction, fracturing, and leaching.

Diagenesis and Provenance of Lati Sandstones in the Berau Area, East Kalimantan Province, based on Petrography Data Maryanto, Sigit
Indonesian Journal on Geoscience Vol 7, No 3 (2012)
Publisher : Geological Agency

DOI:Â 10.17014/ijog.v7i3.143This study is focused on the provenance and diagenetic processes affecting the sandstones of Lati Formation cropping out at Berau Area, East Kalimantan Province. Petrographic analysis of twenty-two samples from this formation shows that these sandstones are classified as litharenite, feldspathic litharenite, sublitharenite, feldspathic wacke, and lithic wacke, which are partially calcareous. Preserved diagenetic processes were visible on the petrographic analysis including cementation, replacement, dolomitization, compaction, and dissolution. The provenance of these sandstones is dominated by granitic rocks initiated from tectonic setting of rifted continental margin, transported toward southeast.

STRATIGRAFI DAN KETERDAPATAN BATUBARA PADA FORMASI LATI DI DAERAH BERAU, KALIMANTAN TIMUR Maryanto, Sigit
Buletin Sumber Daya Geologi Vol 6, No 2 (2011): Buletin Sumber Daya Geologi
Publisher : Buletin Sumber Daya Geologi

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Beberapa lintasan stratigrafi rinci di daerah Lati, Binungan dan Sambarata telah diukur guna mengetahui keterdapatan dan kedudukan stratigrafi satuan pembawa batubara Formasi Lati di daerah Berau, Kalimantan Timur. Data stratigrafi memperlihatkan bahwa Formasi Lati yang terendapkan kala Miosen Tengah di lingkungan rawa-rawa pada hutan hujan yang berada di dataran delta hingga sungai, dengan ketebalan total terukur mencapai 400 meter.Perlapisan batubara mulai hadir secara setempat di bagian tengah formasi, berkembang dengan baik di bagian atas formasi, dan sangat jarang dijumpai di bagian teratas formasi.Perlapisan batubara tersebut pada umumnya berwarna hitam hingga hitam kecoklatan, brightbanded dull-bandedhingga , terkekarkan kuat, pecah subkonkoidal, densitas sedang, kadangkadang dengan parting atau lensa batuan silisiklastika sangat halus, dan tebalnya mencapai650 cm.

Mineralogi dan Geokimia Tuf Berumur Tersier dan Kuarter di Daerah Cibadak, Sukabumi, Jawa Barat Permanadewi, Sam; Maryanto, Sigit; Subandrio, Joko
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 4 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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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.

Sedimentologi dan Diagenesis Batugamping Formasi Wonosari di Ngrijang Sengon, Pacitan, Jawa Timur Maryanto, Sigit
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 4 (2015): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Geosite Ngrijang Sengon adalah salah satu lokasi di kawasan geopark Gunungsewu. Penelitian geologi ini diperlukan untuk mendukung pengusulan kawasan ini sebagai destinasi geopark internasional. Pembahasan utama penelitian ini meliputi perkembangan lingkungan pengendapan dan rekaman proses diagenesis pada batugamping yang tersingkap di lokasi Ngrijang Sengon, Kabupaten Pacitan, Provinsi Jawa Timur. Analisis petrografi telah dilakukan terhadap dua puluh dua sampel batugamping memperlihatkan bahwa jenisnya adalah wackestone, packstone, dan floatstone. Lingkungan pengendapan batugamping ini beragam, seperti sayap terumbu, dangkalan laguna dengan sirkulasi air terbuka di bawah dasar gelombang, laut dangkal dengan sirkulasi terbuka di bawah dasar gelombang, lerengan atau cekungan lokal pada dangkalan laguna, tepi lerengan dan landaian pada paparan tertampi, serta teluk hingga kubangan sangat terbatas. Batugamping tersebut telah terpengaruh beragam proses diagenesis, meliputi: bioturbasi, pengisian rongga fosil, penggantian, penyemenan, rekristalisasi, pemikritan, pembentukan mineral authigenik, pemampatan, pelarutan, dan peretakan.

HUBUNGAN ANTARKOMPONEN MIKROFASIES LERENG TERUMBU OAN CEKUNGAN LOKAL TERUMBU BELAKANG BATUGAMPING BIOKLASTIKA FORMASI BATURAJA 01 OAERAH SEKITAR MUARAOUA, SUMATERA SELATAN Maryanto, sigit
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 2 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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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

SEDIMENTOLOGI BATUGAMPING FORMASI JONGGRANGAN DI SEPANJANG LINTASAN GUA KISKENDO, GIRIMULYO, KULONPROGO Maryanto, Sigit
Jurnal Geologi dan Sumberdaya Mineral Vol 23, No 2 (2013): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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The Early Miocene limstone of the Jonggrangan Formation is cropped out at Gua Kiskendo Section, Kulonprogo Regency. Detailed stratigraphic sections were measured out along twelve kilometers section to predict the development of their depositional environments. Limestone petrography analysis are useful to sharpening the limestone microfacies interpretations. Based on petrography data from thirty eight samples, this limestone formation composes of boundstone, floatstone, grainstone, packstone, wackestone, mudstone, and crystalline limestone. The depositional environments of this formation are regressive condition, include fore-reef facies, organic reef facies, reef flank facies, shelf lagoon with open circulation facies, and shallow marine until local basin on back reef with open circulation facies.Keywords: Miocene, petrography, sedimentology, limestone, reef.

Co-Authors Asep Kurnia Permana Darwin A Siregar, Darwin A Joko Subandrio, Joko Joko Wahyudiono Joshua Shima Juliyanto, Dimas Kusdji Darwin Kusumah R. Hasan Ronaldo Irzon sam permanadewi, sam Topati, Galih

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