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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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PENGARUH TEKTONIK REGIONAL TERHADAP POLA STRUKTUR DAN TEKTONIK PULAU JAWA Bachri, Syaiful
Jurnal Geologi dan Sumberdaya Mineral Vol 15, No 4 (2014): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Sebagai akibat dari perubahan posisi tunjaman di Indonesia bagian barat berimplikasi pada perubahan pola struktur dan tektonik di Pulau Jawa. Pada akhir Paleogen, Jawa bagian tengah, barat dan Laut Jawa kegiatan tektonik dan magmatik tidak aktif lagi alias stabil. Pada waktu itu daerah tersebut menyatu dengan subkontinen yang meliputi sebagian besar Sumatera dan seluruh Semenanjung Malaya. Fisiografi Laut Jawa dicirikan oleh pola kelurusan morfologi dan struktur berarah timurlaut-baratdaya, dan terdapat struktur berarah utara-selatan yang ditunjukkan oleh adanya sesar mendatar menganan di Selat Sunda, antara Jawa dan Sumatera. Arah ini diduga berasal dari fenomena pada kerak benua, dan pembentukannya mungkin berkaitan dengan penekukan arah tektonik utama di Sumatera ke sumbu Pulau Jawa, sehingga umurnya diduga lebih tua dari arah struktur yang pertama. Mulai Eosen Awal hingga Miosen Awal terjadi pemekaran Selat Makassar sebagai akibat mendekatnya kerak benua Australia. Peristiwa ini menyebabkan berkurangnya laju gerakan lempeng Indo-Australia sehingga terjadi perubahan arah pola struktur / tektonik di Jawa dari baratdaya-timurlaut pada Paleogen, menjadi berarah barat-timur pada Neogen.Kata kunci: struktur, tektonik, Jawa, Paleogen, Neogen
PROSES SEDIMENTASI DASAR LAUT DI TELUK KUMAI, KALIMANTAN TENGAH, DAN HUBUNGANNYA DENGAN CEBAKAN EMAS DAN PERAK Usman, Ediar; R.Silalahi, Imelda
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 4 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Results of analysis of gold and silver contents within the sea floor sediments in the Kumai Bay show that the highest contents are at the location of TPL-43, TPL-44, TPL-54, TPL-74 and TPL-75 locations with ranging from 0,09 to 0,19 ppm for gold and 1,6 to 3,75 ppm for silver. A curve showing the relationship between grain size and percentage of grain cumulative of gold and silver bearing sediments indicates that the deposition process is a combination pattern between saltation and suspension. The saltation pattern happened at the grain size between -1,5 to 2 phi and suspension pattern 2 - 4 phi. Based on relation curve of the grain size and frequency percentage of the grains indicate the present of a certain grain dominated the depositional process. The most influenced grain size on depositional process are between 0,5 - 2,5 phi that are a medium sand to very fine sand of about 10 - 28%. The depositional pattern of the sediment in the survey area is influenced by the regime of bay current as a combination of the sea and river currents to form the coastal sand sediments. Result of the analysis can become a guidence in gold and silver mining activities in the study area in order to obtain optimal results, that is on sediments with size ranging from medium - very fine sand around the coastline area. Keywords: sediment, gold and silver, depositional process, grain size, Kumai Bay
PENAFSIRAN STRUKTUR BAWAH PERMUKAAN DAERAH BANGKA UTARA, BERDASARKAN ANOMALI GAYA BERAT H.Simamora, W.
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 3 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The gravity measurement carried out in the North Bangka Quadrangle has produced 1:250,000 Bouguer anomaly, regional and residual gravity maps. Bouguer anomaly values range from 5.0 to 39.0 mgal, regional anomalies arebetween 13.0 until 35.0 mgal and residual anomalies are from -7.0 to 10.0 mgal. The Bouguer anomalies aredivided into three types, i.e : low, medium and high, while the residual anomaly is categorized as positive and negativeareas.The modelling result of three sections of residual anomaly shows that the density of 2.69 gr/cc and interpreted asPemali Complex belongs to the basement in the area. This basement is Pemali Complex which is intruded by rocks with densities of 2.54 ; 2.56 and 2.58 gr/cc and indicated as granitic intrusion. Boundary between Pemali complex, Tanjunggenting formation and granitic intrusion is fault contact. This contact could be potential for secondary tin deposit resulted from weathered granite. Keywords : gravity, residual anomaly, density, tin deposit, Bangka
BATUAN ASAL DAN ALAS FORMASI PALEOGEN CEKUNGAN SERAYU Bachri, S.
Jurnal Geologi dan Sumberdaya Mineral Vol 22, No 1 (2012): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The occurrence of volcanic fragments within the most rock samples of the Worawari Formation, as indicated by SEM and petrographic analysis, suggest that the mainsource rock or provenance of the Worawari Formation is a volcanic rock. The volcanic rock, supposed to be Paleogene in age, was deposited in a short time on land before reworked transported and deposited in the sea, or partly formed as pyroclastic fall which was directly deposited in the sea as indicated by the occurrence of sedimentary structures, mainly wavy and parallel lamination. Meanwhile, a part of the rock samples of the Worawari Formation contain slate fragments suggesting that parts of source rock are metamorphic rock and a quartz rich rock. The quartz rich rock is supposed to be granitic basement as indicated by gravity data. This basement rock is Late Cretaceous in age, as indicated by fission-track dating using By zircon content in the Worawari Formation. The age suggests that the basement rock is apart of the Southeast Asian Plate or Sunda Platform.Key words : provenance, basement rock, Serayu Basin, Paleogen formation
FORMASI MAUBISSE DAN AILEU DI BAGIAN BARAT TIMOR LESTE DALAM KERANGKA TEKTONOSTRATIGRAFI PULAU TIMOR Bachri, Syaiful
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 5 (2008): Jurnal Sumber Daya Geologi
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Abstract

The stratigraphic position of the Maubisse and Aileu Formations in Timor remains controversial despite the latest studies, which tend to place them within the para-autochthonous sequence. Field evidence indicates that the two formations have  transitional relationships with the overlying para-autochthonous Wailuli Formation. Paleontological evidence also indicates that the Maubisse Formation was derived from the Australian continent, and the stratigraphically related Aileu Formation was located on the northwest flank of Australia until the Neogene arc- continent collision event. Keywords: Maubisse Formation, Aileu Formation,Wailuli Formation, tectonostratigraphy, para-autochthonous sequence. 
Analisa Spasial Risiko Longsoran Skala Kecamatan, Studi Kasus di Kecamatan Kaliwiro, Kabupaten Wonosobo Raharjo, Puguh Dwi; Hidayat, Edi; Widiyanto, Kristiawan; Puswanto, Eko; Winduhutomo, Sueno
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 1 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Subdistricts of Kaliwiro - Wonosobo is a region with diverse topography and included in the Karangsambung Geological Nature Reserve. The purpose of this study was to determine the role of socio-community in Karangsambung which influencing the landslides risk. In this study, we analyted every environmental physical factors to give the landslide hazard map. Analytical Hierarchy Process (AHP) is used as a method to processing landslides maps using Geographic Information System (GIS). The landslides hazard associated with the socio-community and the environment, visible role in reducing the landslides risk. The results obtained that in some places have a high-level of landslide hazard. However, the socio-community is very well in overcoming the impact and mitigation of landslides. Social conditions is very influential on the landslides risk which often occur in the Kaliwiro Sub district. Keywords: GIS, lanslide, menace, vulnerability, capacity, risk.
Palynology of the Permian Freshwater Deposit in West Timor Lelono, Eko Budi
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 4 (2016): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

The Permian sediment is considered to be the oldest formation which occurs in West Timor. It derived from Australian continent which was collided in Late Neogene with the Banda volcanic arc in the Timor Island due to northward moving of this continent. It consists of carbonate (limestone) of Maubise Formation and clastic sediment of Bisane Formation (equivalent to Cribas and Atahoc Formations). This study focusses on the Bisane Formation which lithologically comprises thick calcareous sandstone (0.3 - 5 meters) with abundant marine macrofossils of Chrinoid and common mica. These facts suggest that the Bisane Formation was deposited during Permian age in the shallow marine environment. This interpretation supports the previous study to define shallow marine environment for the Permian sequence. However, this study found different lithology of the Bisane Formation in some locations which is composed of the intercalation of noncalcareous, dark gray to black shale and siltstone showing papery structure and rich of sulphur. Seven shale samples were collected randomly due to outcrop limitation. Stratigraphic range and paleoenvironment of key palynomorphs refer to some authors including Traverse (1988), Brugman et al. (1985), Feng et al. (2008), Jan (2014) and Jha et al. (2014). This paper reveals the result of palynological investigation performed on the noncalcareous black shales of the Bisane Formation. Palynological assemblage characterises Permo - Triassic age as indicated by the existence of striate-bisaccate pollen including Protohaploxypinus samoilovichii, P. fuscus, P. goraiensis, Striatopodocarpidites phaleratus, Pinuspollenites globosaccus and Lunatisporites pellucidus. However, the appearance of trilete-monosaccate spores of Plicatipollenites malabarensis and Cannanoropollis janakii defines that the mentioned shales have an age of Permian. The recovered pollen and spores are associated with the freshwater environment as supported by the disappearance of marine dinoflagellates and noncalcareous lithology. Considering tectonic event during Perm which is marked by rifting, it is possible that the analysed sediment is a product of early syn-rift sedimentation as proved by the occurrence of freshwater deposit (probably lacustrine deposit). If this is the case, the appearance of Permian black shale samples provides opportunity to discover new petroleum system in the Paleozoic sedimentary series of West Timor. KEY WORDSPalynology, Permian, Freshwater Sediment, West Timor
Perkembangan Struktur Geologi Bawah Permukaan Berdasarkan Hasil Analisis Data Gaya Berat Di Utara Kendari, Sulawesi Tenggara; Implikasinya Terhadap Kemungkinan Terdapatnya Sumber Daya Geologi Nainggolan, D.A
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 5 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The result of gravity measurement in the studied area, which is mainly covered by ophiolite, has an anomaly value of ranging from -8 to 86 mgal. Geological and tectonical development of the area have similarities with the east arm of Sulawesi. The presence of hydrocarbon in the Batui quadrangle might be possible to be preserved in this region. Interpretation of the anomaly patterns, subsurface profile models, including the geological structures depict the geological processes, tectonics and its relationship with natural resources. The qualitative analysis results of residual and Bouguer anomalies indicate that the structures in the researched area mainly have northwest - southeast and southwest – northeast directions. Meanwhile, the quantitative analyses of three subsurface model profiles show the presence of two kinds of sedimentary rock with the density of 2.20 gr/cc and 2.35 gr/cc. Keywords : gravity, hydrocarbon deposit, Bouguer anomaly, Kendari
DELINEASI CEKUNGAN SEDIMEN SUMATRA SELATAN BERDASARKAN ANALISIS DATA GAYA BERAT Setiadi, Imam; Setyanta, Budi; Widijono, Bambang Suci
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 2 (2010): Jurnal Sumber Daya Geologi
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Abstract

South Sumatra Basin is one of large sedimentary basins in Indonesia which has been proven to produce hydrocarbon energy. Several literatures mention different amount of subbasin with this basin. Gravity is one of geophysical methods that is used to interpret lateral and vertical basin configuration based on rock density parameter. The gravity analysis is conducted by using spectral analysis method in order to estimate shallow and depth anomaly sources, and then to separate regional and residual anomaly using moving average method. The result of spectrum analyses show two discontinuity density plans, located at 3.05 km reflecting the average depth of Tertiary sedimentary basement, and at 15.98 km reflecting Moho discontinuity plane. Meanwhile, the residual anomaly shows that there are two lineament patterns trending northwest-southeast and southwest- northeast. The main fault is Sumatra Fault indicating northwest-southeast lineament, and the subsidiary faults trending southwest-northeast. Azimuth of shallow basement and rifting patterns are northwest-southeast, while the number of identified subbasin are 10. The result of two dimensional modeling shows that the basement in South Sumatra is metamorphic rock having the density contrast 0.12 gr/cc and the average density contrast of the sedimentary rocks filling the basin is -0.22 gr/cc.Keywords : gravity, spectral analyses, moving average, South Sumatra Basin
BATUBARA FORMASI TANJUNG SEBAGAI BATUAN SUMBER HIDROKARBON DI CEKUNGAN BARITO Sutjipto, Rachmat Heryanto
Jurnal Geologi dan Sumberdaya Mineral Vol 15, No 3 (2014): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Cekungan Barito yang terletak di bagian tenggara Kalimantan merupakan salah satu daerah penghasil migas di Indonesia. Cekungan Barito dialasi oleh batuan Pra-Tersier berupa batuan malihan, beku, gunung api, dan sedimen. Cekungan ini diisi oleh batuan sedimen Formasi Tanjung, Berai, dan Warukin berumur Eosen sampai Miosen, yang kemudian secara tidak selaras ditindih oleh Formasi Dahor berumur Plio-Plistosen. Daerah ini sangat kaya akan lapisan batubara yaitu yang dijumpai dalam Formasi Tanjung dan Warukin. Lapisan batubara Formasi Tanjung di daerah ini dijumpai dengan ketebalan 50 sampai 150 cm. Secara megaskopis, lapisan batubara ini berwarna hitam, mengkilap (bright-bright banded), gores warna hitam, pecahan konkoidal, dan ringan. Batubara Formasi Tanjung merupakan salah satu batuan sumber migas di Cekungan Barito. Hasil analisis petrologi organik menunjukan bahwa sebagian besar percontoh batubara tersusun oleh maseral vitrinit, dengan sedikit eksinit dan inertinit. Komposisi batubara Formasi Tanjung seperti ini termasuk batubara tipe humic. Sedangkan pada percontoh batubara 07AM44B tersusun oleh eksinit (74,0%), vitrinit (16,6%), dan inertinit (0,4%) yang menunjukkan bahwa percontoh ini termasuk batubara tipe sapropelic. Batubara tipe humic akan menjadi batuan sumber gas, sedangkan tipe sapropelic dapat berkontribusi sebagai batuan sumber hidrokarbon dari Formasi Tanjung.Kata kunci : batubara, maseral, Formasi Tanjung, Cekungan Barito

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