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Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Published by Kementerian Energi dan Sumber Daya Mineral
ISSN : 08539634     EISSN : 25494759     DOI : -
Core Subject : Science, Education, Social, Engineering,
Education Energy Engineering Environmental Science
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
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THE METAMORPHIC ROCK-HOSTED GOLD MINERALIZATION AT BOMBANA, SOUTHEAST SULAWESI: A NEW EXPLORATION TARGET IN INDONESIA Idrus, Arifudin; Fadlin, Fadlin; Prihatmoko, Sukmandaru; Warmada, I Wayan; Nur, Irzal; Meyer, Franz Michael
Jurnal Geologi dan Sumberdaya Mineral Vol 22, No 1 (2012): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Placer gold has been discovered in Bombana, SE-Sulawesi, Indonesia. The placer gold is not associated with volcanic rock-related gold deposits. This paper discusses the primary gold mineralization as the source of the placer gold. The placer gold is possibly derived from gold-bearing quartz veins hosted by Pompangeo Metamorphic Complex (PMC). Pyrite, chalcopyrite, cinnabar, stibnite and tripuhyite are present. Sheared, segmented vein varies in thickness from 2 cm to 2 m. The veins contain erratic gold in various grades from below detection limit (0.005 g/t) to 134 g/t. At least three generations of veins are identified. The first is parallel to the foliations, the second crosscuts the first generation of veins/foliations, and the third is of laminated deformed quartz+calcite veins at the late stage. The first veins are mostly massive to crystalline, occasionally brecciated and sigmoidal, whereas the second veins are narrower than the first and relatively brecciated. Gold grades in the second and third veins are relatively higher than that in first veins. Fluid inclusion study of quartz veins indicates abundant H2O-NaCl and a small amount of H2O-NaCl-CO2 inclusions. Temperature of homogenization (Th) and salinity of the first vein vary from 184.7 to 245.3 ºC and 5.26 to 9.08 wt.% NaCl eq., respectively. The second generation vein was originated at Th of 132.1-283.4 ºC and salinity of 3.55-5.86 wt.%NaCl eq., whereas the third generation vein formed at lowest Th varying from 114 to 176ºC and less saline fluid at salinity range between 0.35 and 4.03 wt.% NaCl eq. Gold is mainly identified in the form of 'free gold' among silicate minerals. Mineralogically, gold is closely related to cinnabar, stibnite, tripuhyite and possibly minor arsenopyrite. Metamorphogenic gold deposits would be the new target of gold exploration in Indonesia.Keyword: Gold mineralization, orogenic-type, Bombana, Southeast Sulawesi, Indonesia
SUMBER DAYA ALAM DI KAWASAN PESISIR PULAU NUSA PENIDA DAN SEKITARNYA, KABUPATEN KLUNGKUNG, NUSA TENGGARA BARAT Astjario, P.
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 6 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Nusa Penida, Lembongan and Ceningan islands consist of Pliocene reef limestone at some place. The limestone forms dolomite characterized, white in color and soft. The southern coastal of Nusa Penida Island exposed bedded limestone, re-crystallization and weakened. Karts topography widely spread in this island, however it has been eroded.The coastal zone of Nusa Penida, Lembongan and Ceningan islands have been utilized for sea water tourism and sea grass cultivation. However, these areas still have various renewable energy resources which have not yet been developed optimally. In order to support Renewable Energy Park Programs in Nusa Penida, the current energy of Ceningan strait can be used for electricity power energy. Keywords: coastal, renewable energy, current and limestone.
Kandungan Rare Earth Elements pada Granitoid Merah Muda dari Daerah Lagoi dan Perbandingan dengan Granitoid Sejenis Lain Irzon, Ronaldo; Z. Abidin, Hamdan; Baharuddin, Baharuddin; Sendjadja, Purnama; Kurnia, Kurnia
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 3 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Intrusi granitoid berumur Trias di Pulau Bintan termasuk dalam kelompok The Main Range Granite Province of South East Asia. Satuan granitoid tersebut tersebar hingga melebihi 30% dari seluruh satuan batuan di Pulau Bintan. Secara megaskopik, beberapa warna granotoid yang berbeda dijumpai di daerah ini. Kawasan Lagoi, yang berada di pantai utara Bintan, memiliki granitoid dengan ciri spesifik yakni berwarna merah muda (pinkish). Kandungan unsur tanah jarang dalam pinkish granitoid ini cukup tinggi, berkisar antara 170 – 1.015 ppm dengan rata-rata 295 ppm. Nilai unsur tanah jarang ini diplot dalam Spider Diagram untuk dibandingkan dengan intrusi granitoid berwarna sama di daerah lain. Di samping itu, nilai unsur tanah jarang di sini dapat menjadi data nasional. Anomali Eu negatif terdeteksi dalam contoh pinkish granitoid yang menunjukkan bahwa fraksinasi mineral plagioklas terjadi dalam batuan.Kata Kunci: geokimia, Lagoi, pinkish granitoid, unsur tanah jarang.
PETROLOGY AND GEOCHEMISTRY OF THE UPPER MIOCENE VOLCANICS ON THE WESTERN PART OF BARISAN MOUNTAIN RANGES, LUBUK SIKAPING REGION, WEST SUMATRA Harahap, Bhakti Hamonangan
Jurnal Geologi dan Sumberdaya Mineral Vol 21, No 1 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Andesitic and basaltic lavas are the main product of the upper Miocene volcanic activities in Lubuk Sikaping region. They posses vesicular and amygdales structure, dark grey to black in colour, highly porphyritic in texture composed of plagioclase, clinopyroxene, orthopyroxene, olivine (in basalt only) and minor hornblende, magnetite and ilmenite. They (basalt and andesite) mostly fall within the calc-alkaline series on the AFM. The basalt and andesite are not primary magma since they have low Mg# and Ni contents. The lavas resemble the typical of arc setting with Nb through on the spider-diagram patterns, enrichment in large ion lithophile elements and light rare earth elements relative to high field strength elements and heavy rare earth element. They are co-magmatic as shown by the REE pattern. The lavas have high concentration of Ba, Sr, La, Rb and Ce, Zr, Th and U, and high Ba/La ratio which indicating an involvement subducted sediment in their generation. The lava from Lubuk Sikaping is product of Maninjau Crater eruption in Upper Miocene. This lava was uplifted and exposed on high level topography for a few million years, and then superimposed by a high-K calc-alkaline volcanic of mainly rhyolitic tuff as a result of the reactivation of the Maninjau Crater in Pleistocene.Keywords: petrology, geochemistry, calc-alkaline, Lubuk Sikaping, tectonic
Batupasir Kuarsa Wediwutah: Asal Kuarsa dan Informasi Keragaman Geologi Formasi Wonosari, Kabupaten Gunung Kidul Samodra, Hanang
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 2 (2016): Jurnal Geologi dan Sumberdaya Mineral
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Abstract

Secara stratigrafi, meskipun dengan perubahan tegak yang berangsur, lapisan batupasir kuarsa yang berkembang pada runtunan paling bawah Formasi Wonosari dapat dipisahkan dengan lapisan batugamping yang menutupinya. Sejarah sedimentasi selama Miosen Tengah ini, meskipun hanya setempat, akan memperkaya informasi keragaman geologi (geodiversity) daerah Gunung Sewu bagian barat dari aspek litologi.  Berdasarkan metoda jejak belah yang menggunakan zirkon sebagai mineral penentu umur mutlak batuan, batupasir kuarsa di Wediwutah dan Gombang masing-masing berumur 12,6 ± 1,2 juta tahun dan 24,3 ± 2,9 juta tahun. Terkait dengan identifikasi batuan sumber (provenance) dari kuarsa tersebut, pendugaan awal yang sifatnya masih hipotesis mengarah pada dua sumber yang berbeda, yaitu dari tuf Formasi Oyo dan tuf Formasi Semilir.
Posisi Stratigrafi dan Petrogenesis Intrusi Pendul, Perbukitan Jiwo, Bayat, Kabupaten Klaten, Jawa Tengah Surono, Surono; Hartono, Udi; Permanadewi, Sam
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 5 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The Pendul Intrusion consists of andesite, diabas, diorite, and gabbro; that are widely distributed within the Jiwo Hills, south of Klaten, Central Jawa. K/Ar datings of 4 rock indicate that there are two magmatism episodes; Middle Eocene - Early Oligocene (39,82 - 30,04 Ma) and Middle Miocene (17,22 - 13,85 Ma). Trace element concentrations of the Pendul rocks characterize that the magma was originated from subduction environment as a result of mantle wedge melting. The rocks are characterized by low Nb relative to K and La contents. The rare earth element signatures indicate that the Pendul magmas might have come from defferent parent magmas. The Middle Eocene - Early Oligocene parent magmas posses lower rare earth element concentrations than those of the Middle Miocene ones. Keywords: Bayat, Pendul Intrusion, two magmatism episodes, stratigraphy
KARAKTERISTIK, TIPE DAN BIDANG GELINCIR PADA ZONA LONGSOR CILOTO, JAWA BARAT BERDASARKAN ESTIMASI METODE GEODETIK Kahar, Joenil; Santoso, Djoko; Sadarviana, Vera; Abidin, Hasanuddin Z.
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 2 (2010): Jurnal Sumber Daya Geologi
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Abstract

Slip surface is delaminates between sliding material and undisturbed slope material. In limit equilibrium method, slip surface is used as reference for safety factor calculation. Landslides phenomenon can be observed using of GPS satellite technology to mitigation and material displacement monitoring. For that purpose, this research is carried out to estimate characteristic, type and slip surface position at Ciloto landslide zone by GPS survey.First, estimation of slip surface is carried out by slope surface profile which referred to same direction of horizontal displacement of monitored points. The same direction of horizontal displacement at several monitored points indicate that the monitored points can be located at the same slip surface. Second, maximum-minimum function of geometric method and polynomial approach, including graphical method by velocity trend line plotting for each monitored point, were done to find out point position at slip surface. Ideal planar slip surface is determined by infinite slope analysis and circular slip surface is determined by circle arc analysis. Estimation of slip surface by geodetic method approach couldn't give result because geodetic data describe slope surface. By intersection of velocity trend line of monitored point, it can gave estimation of slip surface location. Geodetic approach could gave estimation of scarp position as well as crack which is indicate beginning of slip surface. Locations of scarp in vertical profile have suitability with result of geology research at same study area.Ciloto landslide zone is classified in very slow velocity landslide (5 x 10-5 - 5 x 10-7 mm/second). The characteristic of horizontal displacement has various direction for each monitored point. Vertical displacements of monitored point have subsidence and uplift or bulging. That characteristic formed hummocky terrain and the other side of zone have gradual slope. From the research, the landslide type at Ciloto zone is multiple compound (rotational and translational) debris slides.Keywords : geodetic method, GPS survey, landslide characteristic, landslide type, slip surface, multiple landslide, scarp
KONTROL TEKTONIK DAN STRUKTUR GEOLOGI TERHADAP KETERDAPATAN HIDROKARBON DI DAERAH PAPUA Bachri, Syaiful
Jurnal Geologi dan Sumberdaya Mineral Vol 15, No 3 (2014): Jurnal Geologi dan Sumberdaya Mineral
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Abstract

Sebagian besar daerah Papua, khususnya di bagian selatan sutur pembatas lempeng Pasifik dan lempeng Australia, dialasi oleh kerak benua Australia, termasuk sedimen di atasnya yang berasal dari paparan baratlaut Australia. Keberadaan batuan sedimen yang umumnya berumur Mesozoik tersebut sangat penting artinya, karena sebagian merupakan batuan sumber hidrokarbon dan juga batuan waduk. Sesar mendatar berskala regional seperti Sesar Sorong atau Sesar Yapen mempunyai arti penting dalam pembentukan cekungan-cekungan pull –apart yang dapat menjadi cekungan berpotensi hidrokarbon. Tektonik kompresi yang dihasilkan dari proses konvergensi kerak benua Australia dan kerak samudera Pasifik menghasilkan lajur-lajur lipatan dan sesar naik, khususnya lajur lipatan Lengguru di bagian tengah dan lajur lipatan – sesar naik Mamberamo di bagian utara Papua. Struktur lipatan (antiklin) serta struktur ramp akibat penyesaran naik akan membentuk struktur tutupan yang dapat berfungsi sebagai perangkap struktural hidrokarbon.Kata kunci: tektonik, struktur geologi, hidrokarbon, Papua.
CRETACEOUS OROGENIC GRANITE BELTS, KALIMANTAN, INDONESIA Amiruddin, Amiruddin
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 3 (2009): Jurnal Sumber Daya Geologi
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Abstract

Two types of Cretaceous Orogenic Granite-Belts are able to be recognized in Kalimantan, which tend to show characteristics of Cordilleran and Caledonian Granite-Types. The Cordilleran Granite-Type consists of huge granitoid batholiths known as the Schwaner, Ketapang and Singkawang batholiths. This granite type comprises tonalite and granodiorite, and minor granite sensu stricto, predominantly owning calc-alkaline to slightly alkaline composition. The granitioids are also metaluminous and slightly peraluminous which probably due to the assimilation of magma stopping. Genetically, the granite is an I-type which was formed during a subduction of oceanic crust material beneath a continental margin. Those plutons were emplaced during a longer period, ranging from 86 to 129 m.a or from Early to Late Cretaceous. The Caledonian Granite-Type comprises isolated smaller plutons of Pueh Granite, Manyukung Granite, Era Granite, Topai Granite, Nyaan Granite, Alan Granite, Kelai Granite and Sangkulirang Granite. This granite type consists of granite sensu stricto and granodiorite, having calc-alkaline and alkaline and also metaluminous and peraluminous compositions. They belong to I-type and S-type granites, suggesting that in the area, different magma sources had been generated. The Itype granite was derived from partial melting of igneous rock whereas the S-type one was derived from anatexis of sedimentary rocks of continental crust. These plutons were emplaced within a relatively short time, ranging from 74.9 to 80.6 m.a or Late Cretaceous. Keywords: Cretaceous Orogenic Belts, Cordilleran and Caledonian Granite types.
PENELITIAN LAPISAN AIR TANAH DENGAN METOD GEOLOGI PERMUKAAN, GAYA BERAT DAN GEOLISTRIK DI CEKUNGAN BANDUNG TIMUR Panjaitan, Saultan
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 2 (2007): Jurnal Sumber Daya Geologi
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Abstract

Bouguer anomaly of 20 to 44 mgal are interpreted as igneous rocks and volcanic sediments. On the other hand, low Bouguer anomaly of 8 mgal to 20 mgal reflect the Bandung Basin. The Bandung Basin can be divided into two smaller basins, they are the Western Bandung Basin and the Eastern Bandung Basin. The Eastern Bandung Basin is marked by Bouguer anomaly of 10 mgal. The two smaller basins are separated by a high Bouguer anomaly of 30 mgal trending from south of Mount Malabar to the north of Ujungberung subdistrict. The thickness of Quaternary layers in the Eastern Bandung Basin at gravity profile is between 400 - 1000 m. This interpretation is supported by the resistivity value of ? around 551 ohm. Groundwater layers can be groupped into two parts: the shallow and deep groundwater. Shallow groundwater is found at the depth of 13 - 35 m with ? 8 - 13.2 ohm metres. Deep groundwater is located at depth of 70 m with ? 2.8 - 8.5 ohm metres. The shallow and deep groundwater layers are separated one from the other by impermeable rocks with ? value varies up to 551 ohm metres.

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