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Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
ISSN : 08539634     EISSN : 25494759     DOI : -
Jurnal Geologi dan Sumberdaya Mineral (JGSM) is an Indonesian scientific journal published by the Center for Geological Survey, Geological Agency, Ministry of Energy and Mineral Resources. The journal receives Indonesian or English articles. Those articles are selected and reviewed by our professional editors and peer reviewers.
Arjuna Subject : -
Articles 341 Documents
COMPOSITIONAL VARIATIONS OF Au-Ag TELLURIDE MINERALS OF ARINEM DEPOSIT, WEST JAVA Yuningsih, Euis Tintin
Jurnal Geologi dan Sumberdaya Mineral Vol 21, No 3 (2011): Jurnal Sumber Daya Geologi
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Abstract

The epithermal Arinem veins system of gold-silver-base metal mineralization is located in the Arinem area in the southwestern part of Java Island, Indonesia. The veins are composed predominantly of quartz+calcite±illite±kaolinite with variable amount of manganese oxide and limonite and high amount of sulfides. The deposit contains a number of Te-bearing minerals, notably tellurides and tellurosulfide minerals. The tellurium mineral assemblages in the Arinem and Bantarhuni veins are similar in the presence of hessite (Ag2Te), petzite (Ag3AuTe2), stutzite (Ag5Te3), tetradymite (Bi2Te2S) dan altaite (PbTe). The tellurium mineral assemblages vary from sample to sample and most of the observed telluride occurrences consist of at least 2 different phases (e.g. petzite-hessite, tetradymite-hessite, petzite-hessite-altaite). Gold concentrations measured in Te-mineral of petzite from the Arinem vein are in the range between 14.24 to 18.32 wt%. Some hessite and stutzite contain gold up to 3.48 and 1.10 wt%, respectively. Some of electrums are present as inclusions in Te-mineral patches in both veins.Keywords : Electrum, petzite, sulfide, tellurides, Arinem, Bantarhuni
Pemisahan Unsur Tanah Jarang ( Ce, La, dan Gd ) dengan Metode Solvent Impregnated Resin menggunakan 1-fenil-3-metil-4-benzoil-5-pirazolon Rohiman, Asep; Buchari, Buchari
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 4 (2015): Jurnal Geologi dan Sumberdaya Mineral
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Abstract

Indonesia merupakan salah satu negara di dunia yang kaya sumber daya mineralnya, termasuk unsur logam tanah jarang. Sayangnya, teknologi untuk memurnikan unsur tanah jarang tersebut belum mumpuni. Salah satu teknologi terbaru saat ini dalam bidang pemisahan adalah dengan teknik mengimpregnasikan senyawa ekstraktan terhadap resin, yang dikenal dengan metode SIR. Senyawa pirazolon dan turunannya diketahui dapat digunakan untuk mengekstrak sejumlah ion logam salah satunya adalah ion logam tanah jarang. Pada penelitian ini, senyawa HPMBP telah berhasil disintesis. Senyawa tersebut digunakan sebagai ekstraktan untuk mengekstraksi ion logam tanah jarang dengan menggunakan metode SIR. Untuk menentukan kemurnian dan kesesuaian dengan yang diharapkan maka dilakukan karakterisasi baik secara fisik maupun kimiawi terhadap senyawa hasil sintesis tersebut yang meliputi: uji titik leleh, TLC, HPLC, karakterisasi gugus fungsi dengan spektroskopi IR, dan NMR. Tahap berikutnya yaitu penyiapan SIR yang dilakukan dengan cara mengamobilkan senyawa HPMBP pada  Amberlite XAD-16. Rasio berat HPMBP terhadap XAD-16  yang dapat diamobilkan yaitu 3 : 2. Selanjutnya, produk SIR tersebut digunakan untuk ekstraksi La+3, Ce+3, dan Gd+3 dalam media HNO3 0,1 M sebagai fasa air dengan cara batch. Kondisi pH optimum untuk ekstraksi La+3, Ce+3, dan Gd+3 secara berurutan diperoleh pada  pH = 3,1 ; pH = 2,19 dan pH = 1,70.
KONDISI GEOLOGI DAERAH RUTENG DITAFSIR PADA DATA GAYA BERAT Padmawidjaja, Tatang
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 5 (2010): Jurnal Sumber Daya Geologi
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Abstract

Ruteng Area was occupied by the gravity anomaly values between 60 to 160 mgal, showing high anomaly between 100 to 160 mgal and basin anomaly indicated by gravity values between 60 to 100 mgal. The high anomalies are associated with a shallow or exposed basement consisting of Kiro Formation. Wuas Basin is interpreted as intermountain basin, meanwhile basins from Ruteng to the southern part are controlled by faults, and the high anomalies at the southern part is presumed to be granodiorite (Tmg). The sedimentary rocks filling the basins are Nangapanda and Bari Formations. Based on the lineament, there are some faults involving Ruteng, Ulumbu, Pocodedeng and Bajawa Faults. AB geological model of the gravity anomaly cross section shows two layer, consisting of lower layer (basement) with density of 2.71 gr/cm3, the second layer is sedimentary rocks with density of 2.6 gr/cm3. Ruteng, Ulumbu, and Pocodedeng faults controlled the swallowing magma of which can function as a heat source of the geothermal system at the studied area.Keywords : gravity anomaly, lithology, faults, geothermal, Ruteng area.
POLA KELURUSAN TOPOGRAFI DI WILAYAH MAJALENGKA, JAWA BARAT Zakaria, Zufialdi
Jurnal Geologi dan Sumberdaya Mineral Vol 15, No 2 (2014): Jurnal Geologi dan Sumberdaya Mineral
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Abstract

Penelitian ini mencakup wilayah Kabupaten Majalengka, Sumedang, dan Kuningan, Jawa Barat. Penelitian bertujuan untuk mengetahui peran tektonik serta menguji pengaruh tektonik aktif terhadap kelurusan morfologi di wilayah tersebut. Hasil uji beda dengan T-test pada semua pola kelurusan topografi di batuan Tersier dan batuan Kuarter menunjukkan tidak terdapatnya perbedaan yang signifikan dengan thit= - 0,301, dan ttabel =1,971 (a=0.05). Tektonik aktif ditunjukkan oleh kesamaan pola kelurusan pada dua batuan yang berbeda umur, yaitu pada batuan berumur Kuarter dan Tersier. Kedua batuan sama-sama terkena proses deformasi, dan sama-sama mengalami pengangkatan. Jika pola kelurusan dibagi secara khusus menjadi empat pola, yaitu Pola Meratus, Pola Jawa, Pola Sumatera dan Pola Sunda, maka hasil uji beda kelurusan topografi pada batuan Tersier dan Kuarter (T-test, dengan a=5%) adalah sebagai berikut: Kelurusan topografi dari pola Meratus menunjukkan perbedaan nyata, dengan thit=-3,117, dan ttabel =2,011 (a =0,05). Kelurusan topografi berpola Jawa, menunjukkan tidak terdapat perbedaan yang signifikan dengan thit=-0,980, dan ttabel =2,024 (a=0.05). Kelurusan topografi berpola Sumatera menunjukkan perbedaan nyata, dengan thit=2,567, dan ttabel =1,983 (a=0.05). Kelurusan topografi berpola Sunda tidak menunjukkan perbedaan yang signifikan, dengan thit=0,473, dan ttabel =1,998 (a=0.05). Tektonik yang menyebabkan perbedaan pada Pola Meratus dan Pola Sumatera adalah tektonik masakini (neotektonik) yang diperlihatkan melalui reaktivasi sesar-sesar yang ada, terutama melalui keberadaan sesar aktif misalnya Sesar Baribis.Kata kunci: kelurusan topografi, neotektonik.
KARAKTER WILAYAH GENANGAN LAKUSTRIN HOLOSEN BERDASARKAN ASPEK SEDIMENTOLOGI DAN STRATIGRAFI ENDAPAN RAWA DAN UNDAK SUNGAI (Studi Kasus Geologi Kuarter Daerah Air Molek dan Sekitarnya, Kab. Singingi dan Kab. Indragiri Hulu, Provinsi Riau) Hidayat, Suyatman; Basri, C; Subiyanto, Subiyanto; Mulyana, Herman; Moechtar, Herman
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 5 (2009): Jurnal Sumber Daya Geologi
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Abstract

This study was based on analyses of sedimentology and stratigraphy of nine sediment samples obtained from shallow boreholes. The boring was done of A - B traverse, southwest – northeast direction around Indragiri river, south of Rengat. The study was focus on river channel and lauctrin deposits under the swamp sediments and river terraces as the resent of penetration of the bore head varies from 3.80 to 9.95 m . Based on the correlation of lateral and vertical variation, the stratigraphic succession can be grouped into two depositional interval i.e. depositional interval I & II. (IP.I & IP II). Vertical changes on the lithologic composition can be related to changes on humidity conditions. It is shown from the changes in the character of the facies between lower and upper lacustrine. Changes in basin centre between lower and upper lacustrine environment, as the result of basement movement caused by tectonic activity, impected to up and down movement of the basin floor. Keywords : Quaternary sediments, lacustrine, climate, tectonic
HUBUNGAN LINGKUNGAN PENGENDAPAN FORMASI MALAWA DAN KETERDAPATAN BATUBARA DI DAERAH SOPPENG, SULAWESI SELATAN Kusnama, Kusnama; Andi Mangga, Syahrir
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 4 (2007): Jurnal Sumber Daya Geologi
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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
FASIES KARBONAT FORMASI CAMPURDARAT DI DAERAH TULUNGAGUNG, JAWA TIMUR Praptisih, Praptisih; Siregar, M. Safei
Jurnal Geologi dan Sumberdaya Mineral Vol 22, No 2 (2012): Jurnal Sumber Daya Geologi
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Abstract

The Campurdarat Formation is one of the carbonate rocks exposed in the Tulungagung areas and its surrounding, East Java. Detail investigation for studying facies and sedimentation of this limestone has been conducted. The investigation include field investigation and laboratory method, consisting of petrography and micropaleontology. The result of petrographic analysis showed that the carbonate rocks in the area investigation can be divided into four types of facies such as packstone, floatstone, rudstone and boundstone. Packstone facies was deposited from the backreef – lagoon environment, floatstone facies in backreef and coral zones environments, rudstone facies in the reef zone environment and boundstone facies formed starting from the reef front - reef crest. The Campurdarat carbonate rocks are interpreted to represent a barrier – reef of Early Miocene age.Key words : Campurdarat Formation , facies, carbonate, environment, sedimentation, reef, Tulungagung
MODEL GEOLOGI BAWAH PERMUKAAN DAERAH MUARAWAHAU HASIL ANALISIS ANOMALI GAYA BERAT BERDASARKAN ESTIMASI KEDALAMAN DENGAN METODE ANALISIS SPEKTRAL Setyanta, Budi; Setiadi, Imam; Simamora, W.H.
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 6 (2008): Jurnal Sumber Daya Geologi
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Abstract

A Study about a depth estimation on a gravity model in Muarawahau quadrangle, East Kalimantan, by using a Spectral Analysis method is very helpful to reduce ambiguity that appears in each modeling. The qualitative analysis shows that high anomalies lay at the eastern part of  the research area with values between  10 - 55 mgal, while low gravity anomalies between  -60 to 9 mgal lay at the western area. Two groups of anomaly in this area reflect a basin and basement high which is separated by a regional strike slip fault . A Model resulted  from  East to West  profiling and supported by a Spectral Analyses Method shows that the basin is constructed by PreTertiary rocks with density of about 2.6 gr/cc and thickness approximately 5 km, experiencing tectonic deformation. The eastern high anomaly block is the reflection of ultramafik rocks and mélange with the density of about 2.65 gr/cc. Rocks in this block is partly covered by volcanic sediments abaut 500 meter thich (2.3 gr/cc). However based on the values of anomaly, those two blocks are still underlined by the same granitic continent, meanwhile the existing ultramafic rocks are only ophiolite fragmen of oceanic crust. Keywords : Gravity anomaly, depth estimation, geological model.
Kondisi Geologi dan Pemodelan Kestabilan Lereng Jalur Transek Liwa-Ranau, Liwa, Lampung Barat Iqbal, Prahara; Aribowo, Sonny; Mulyono, Asep; Syahbana, Arifan Jaya
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 3 (2017): Jurnal Geologi dan Sumberdaya Mineral
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Abstract

Landslide investigations and slope stability modeling have been carried out on the Liwa-Ranau transect road, West Lampung, with the aim of finding the relationship between geological conditions and landslide events. The research methods that be used in this investigation are geological mapping, disturbed and undisturbed soil sampling, laboratory analysis, slope stability analysis, and structural geology analysis. The Liwa-Ranau transect road has a hills topography with a NE-SW, north-south, and NW-SE direction and relatively sharp curve lineament. Based on the field observations, there are four points of landslides which are distributed in the middle of the transect road. Result of field observation shows soil translational slides and debris flow slides which developed with a 12-15 m wide, 15-55 m height, and 37-75 o slope angle. The sliding soil and rock types consist of sandy tuff, clay soil, and claystone.Keywords: Liwa-Ranau transect road, West Lampung, landslide, slope stability modeling, clay soil, sandy tuff
ANCAMAN BAHAYA LETUSAN GUNUNG API SKALA BESAR DAN MONOGENESIS DI INDONESIA Bronto, S.; Setianegara, R.
Jurnal Geologi dan Sumberdaya Mineral Vol 21, No 1 (2011): Jurnal Sumber Daya Geologi
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Abstract

Indonesia has a lot of volcanoes which their potentially hazards threaten people and environment. Mitigation efforts have been conducting to 129 active volcanoes where source locations and types of hazard are relatively well defined, mainly based on historical records. However, volcanic hazards due to larger eruptions, such as caldera explosions and gigantic volcanic debris avalanches, still require basic geological data. This also includes potentially hazard studies on monogenetic volcanoes, that may form a new vent at outside of the present active volcano. This idea is proposed based on facts that there has no a large scale explosion since the Tambora 1815 and Krakatau 1883 eruptions, but large scale tectonic activities have frequently occurred recently causing big tsunamis and earthquakes. Secondly, Sidoarjo mud volcano has been erupting for long time, and volcanic areas are occupied for living and business, intensively.Key words: hazard, volcano, caldera, explosion, avalanche, monogenetic

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