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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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STRUKTUR GEOLOGI BAWAH PERMUKAAN LINTASAN PANGALENGAN-SUBANG, IMPLIKASINYA TERHADAP KESTABILAN LAHAN Subagio, Subagio; Widijono, Bambang Suci
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 6 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The high anomaly pattern of West Java extending from Banten Province to the boundary of West - Central Java area, changes to low anomaly pattern in Bandung to Pamanukan. This phenomenon formed anomaly alignment with high gradient in the boundary part of both anomaly patterns. The profile pattern of Bouguer anomaly along Pangalengan­Subang and Gudangkahuripan-Parongpong sections show more detailed illustration of the subsurface geology structures. Qualitative and quantitative gravity analyses that were supported by surface geological data, sediment thickness, and remote sensing data, estimate that the anomaly alignment reflects a fault that formed a big graben. The anomaly profiles also describe some fault forming some horsts and grebens. Based on erotion intensity esoect in the mountainous area, and geological structures, the land stability of this area is interpreted as very low. Keywords.' high, low, anomaly alignment, structure, Pangalengan-Subang Section, horst, graben, land stability
EROSI PANTAI PADA ZONA STABIL SEBAGAI DAMPAK REKLAMASI LOKAL DI PERAIRAN ANYER SELAT SUNDA, BANTEN Ilhaude, Delyuzar
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 5 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The studied area is geographically located on the Sunda Strait, Banten Province,  known  as touris  area.  The erosion and sedimentation processes occur along Anyer longshore area.  The mechanism of erosion is strongly caused by the irregular pattern of longshore current and the wave difraction of which they are affected by the breakwater system in the Anyer coast.  The erosion process occurs because of the tidal wave and the maximum height is in the west monsoon in December until februari. Keywords: touristarea, longshore current, erosion coast
REKONSTRUKSI VARIASI BULANAN SALINITAS DI JALUR ARUS LINTAS INDONESIA SELAMA ~ 200 TAHUN: REKAMAN SALINITAS DARI δ18О KARANG BUNAKEN DAN BALI Hernawan, Indra; Cahyarini, Sri Yudawati; Putri, Mutiara
Jurnal Geologi dan Sumberdaya Mineral Vol 22, No 3 (2012): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Salinity is one of important parameter in oceanographic studies. The long timeseries oceanographic data is required to more understand the variability of oceanographic condition. Coral geochemical proxies overcome the shortcoming of instrumental data availibility. δ18О contents in coral skeleton is influenced by sea surface temperature and δ18О seawater. δ18О seawater is influenced by salinity. In this study salinity is reconstructed using coral δ18О and SST from the data model. δ18О from Bunaken and Padang Bai (Bali) corals are used in this study. SST data from the ERSST, SODA and HAMSON are used to reconstruct salinity. This study result in that the Bunaken coral records the local salinity variation in monthly and annual mean resolution. Padang Bai coral records better salinity in annual mean variation than in monthly variation. In both region, salinity variation in decadal resolution does not show significantly different.Keywords: Salinity, Sea surface temperature, δ18О, coral, Bunaken and Bali.
Diagenesis, coalification, and hydrocarbon generation of the Keruh Formation, In Kuantan-Singingi Area, Central Sumatera, Indonesia Heryanto, Rahmat
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 1 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The Eocene-Oligocene Keruh Formation is exposed in the western part of Kuantan-Singingi area, southwest margin of the Central Sumatera Basin. It is correlated to the Pematang Group in another part of the Central Sumatra Basin and is also to the Kelesa Formation in the Tigapuluh Mountains. The formation is composed of conglomerate and well-bedded sandstone in the lower part, interbedded mudstone and coal seams in the middle part, and mainly made up of laminated to well bedded light-dark grey to blackish organic-rich mudstones in the upper part of succession. It was deposited in a fluviatiIe to a lacustrine environment with some marine condition influences.Diagenetic processes which occurred in the Keruh Formation are compaction and formation of authigenic mineral and secondary porosity. The compaction effects are illustrated by the presence of bending of mica flakes and by grains supported fabrics with long grain contact as well as clay mineral oriented. The formation of the authigenic minerals is recorded by the presence of authigenic quartz and clay minerals, and also quartz overgrowths. The secondary porosity occurrence is caused by a dissolution of the feldspar and clay minerals. The diagenetic stage of the Keruh Formation is included into a mesogeneticsemi-mature to mature "A" which equal to mudrock stage II.Based on the maturity of this Formation reflectance within dispersed organic matter (d.o.m.) and coal of the Keruh Formation, the naturity of this Formation is included into an immature to early mature stage, whereas based on the T max and Hydrogen Index (HI)  values, the kerogen With Formation is categorized Into a late immature to early mature level.There Is a relationship between diagenetic stage and maturation of organic matter which was caused by the burial history with the depth of buriaI between 2000 to 3000. m, which  produced the paIeo temperature of 65° to 95°C.Keywords: Keruh Formation, diageneses, authigenic mineral, thermal maturation
STRUCTURAL PATTERN AND STRESS SYSTEM EVOLUTION DURING NEOGENE - PLEISTOCENE TIMES IN THE CENTRAL PART OF THE NORTH ARM OF SULAWESI Bachri, S.
Jurnal Geologi dan Sumberdaya Mineral Vol 21, No 3 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The study area has been subjected to intense fracturing or brittle deformation resulting in five main trends of lineaments and faults, i.e. (1) the Group A (the Perantanaan Fault Group) with a mean of direction N95°E/ N275°E, (2) the Group B (the Gorontalo Fault Group) with a mean of direction N125°E/ N305°E, (3) the Group C (the Paleleh Fault Group) with a mean of direction 165°E /N335°E, (4) the Group D (the Randangan Fault Group) with a mean of direction N25°E/ N205°E and (5) the Group E (the Kuandang Fault Group) having a mean of trend of N55°E/ N235°E. The complexity of structural pattern in the study area has been interpreted to be due to stress system evolution during Neogene - Pleistocene. The changing stress system orientation has reactivated the preexisting faults of the five groups with different sense of movements from the older deformation.The nearly E-W trending lineaments of Group A or the Perantanaan Fault Group coincide with trend of the long axis of ridges and valleys or depression areas which are covered by volcanic rocks, lake deposits, and alluvium of Quaternary age. This group of structures was presumably developed as reverse or thrust faults during Late Neogene which later on to have beem reactivated as normal faults due to extensional tectonics of the North Sulawesi area during Plesitocene.The Gorontalo Fault, as a part of the Group B (the Gorontalo Fault Group), generally has been interpreted as dextral wrench fault. The present structural analysis suggests that this major fault was formerly developed as a dextral fault during Neogene, and later during Pleistocene it was reactivated in the sense of sinistral fault due to the changing of the stress system. The Neogene stress orientation is supposed to be related to the subduction of the North Sulawesi Sea to the south, which during Pleistocene weakened as the Sangihe Subduction in the Mollucas Sea to the east commenced resulting in the change of field stress orientation.Key words: Structural pattern, stress system, Neogene - Pleistocene, north arm of Sulawesi
Konfigurasi Cekungan Kuarter Wilayah Kota Mataram, Nusatenggara Barat Berdasarkan Data Mikrotremor Marjiyono, Marjiyono
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 1 (2016): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Informasi geologi bawah permukaan memegang peranan yang penting dalam berbagai aspek kehidupan dasar manusia baik yang menyangkut sumber daya alam, daya dukung dan lingkungan serta kebencanaan. Penerapan kombinasi metode mikrotremor single station dan mikrotremor array telah dilakukan untuk memodelkan kondisi bawah permukaan dangkal di wilayah Kota Mataram. Pengukuran mikrotremor single station dimaksudkan untuk memperoleh nilai frekuensi resonan tanah, adapun mikrotremor array digunakan untuk sounding kecepatan gelombang geser secara 1D. Hasil pemodelan menunjukkan ada dua lapis litologi dengan lapisan permukaan adalah endapan aluvium, sedangkan lapisan di bawahnya kemungkinan merupakan batuan sedimen yang lebih tua. Konfigurasi cekungan menunjukkan adanya tinggian di bagian timur yang membentuk pola kelurusan berarah barat daya - timur laut, sedangkan pada bagian barat menunjukkan pola cekungan-cekungan yang relatif dalam. Kata kunci : mikrotremor single station, mikrotremor array, konfigurasi cekungan, frekuensi resonan, kecepatan gelombang geser.
RESPON SISTEM FLUVIAL TERHADAP PERUBAHAN IKLIM PLISTOSEN AKHIR-HOLOSEN TERKAIT SIKLUS MILANKOVITCH (Studi kasus geologi Kuarter berdasarkan aspek sedimentologi dan stratigrafi di dataran rendah pantai Pekalongan, Jawa Tengah) Moechtar, Herman; Mulyana, Herman
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 5 (2010): Jurnal Sumber Daya Geologi
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Abstract

The study consist of sedimentology and stratigraphy analyses of fiveteen boreholes along the NW-SE and N-S, starting from near shorelines to the southern area. The depth of bore hole varies from 9.25 to 14.80 m. The Late Pliestocene-Holocene sediments in the studied area have been correlated, using ceoss section in 1:100 scales. The sediments consist of offshore, nearshore, beach, swamp, river channel, and floodplain deposits. The study is focused in the river channels. The changing vertically and laterally of river channel show the effects of climate and tectonic. During fluvial systems (IP II and IP III) depositional process, show climatic changes on Milankovitch cycles involving a stage episode from the middle of sub-humid (D2/ late warming) to the late sub-humid (B1/ early cooling). River channel shifting due to laterally base level change is influenced by tectonic.Keywords: River channel, climate, Late Pleistocene-Holocene
PERKEMBANGAN KERANGKA TEKTONIK LAUT MALUKU, KEPULAUAN BANGGAI – SULA DAN LAJUR OFIOLIT SULAWESI TIMUR Hermanto, Bambang
Jurnal Geologi dan Sumberdaya Mineral Vol 15, No 2 (2014): Jurnal Geologi dan Sumberdaya Mineral
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Abstract

Laut Maluku, bagian timur Sulawesi, dan Kepulauan Banggai – Sula merupakan tiga daerah yang saling berbatasan namun memiliki ciri kerangka tektonik yang berbeda. Laut Maluku merupakan zona tumbukan busur dengan busur, yang terletak di daerah pertemuan antara lempeng-lempeng Eurasia, Pasifik dan Filipina. Kepulauan Banggai - Sula merupakan benua renik pecahan dari Australia. Sesar-naik Sula di utara Banggai-Sula merupakan bagian selatan dari zona pensesaran berarah barat-timur selebar 30 – 40 km. Zona sesar ini diduga merupakan batas akhir bagian barat zona sesar Sorong yang tersingkap di bagian barat Papua. Sementara itu bagian timur Sulawesi dicirikan oleh adanya lajur ofiolit yang berasal dari pengalihtempatan atau obdaksi.Kata kunci: Laut Maluku, Kepulauan Banggai – Sula, lajur ofiolit, obdaksi.
CONTRIBUTION OF ARC MAGMATISM STUDIES IN EARLY STAGE MINERAL EXPLORATION Hartono, Udi
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 5 (2009): Jurnal Sumber Daya Geologi
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Abstract

Indonesia contains at least 15 volcano-plutonic arcs with total length of approximately 9,000 km. The eight arcs contain known mineral deposits, while the rest may have mineral deposit prospects. The discovery of new mineral resources depends on research into the genesis of ore deposits and improved methods of finding them. In order to reduce a high exploration cost, knowledge of arc magma genesis is very important in mineral exploration before further study on mineral deposit genesis. Review on a number literatures suggests there is no linear correlation between potential porphyry-Cu/ epithermal mineralization and a single petrological/ geological factor. Mineral deposit formation is a product of interplay of magmatism, tectonics, volcanism, and fluid processes. Keywords : arc magma genesis, ore deposits, exploration
MORFOTEKTONIK DAN REAKTIVITAS SESAR SUMATERA DI PADANGPANJANG, SUMATERA BARAT Poedjoprajitno, S.
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 3 (2007): Jurnal Sumber Daya Geologi
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Abstract

Studies on tectonic morphology in the Sumatera fault zone at Padangpanjang segment by using lineament analysis on transect and landsat image have recoqnized some tectonic landform features. These features are among others,curvature of Kubu ridge line, eroded faultscarp, alignment of Kayutanduk sagpond, Kotobaru sagpond, Talago sagpond, Tanang River, and Airanget and Gadis River fault valley at Batipuh village and surrounding area.  Keywords : tectonic landform, morphostructure, morphotectonic

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