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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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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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Abstract

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.
MIKROZONASI KERENTANAN BAHAYA GONCANGAN GEMPA BUMI KOTA PEKALONGAN BERDASARKAN ANALISIS MIKROTREMOR Soehaimi, Asdani; Marjiono, Marjiono; Kamawan, Kamawan
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 5 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Microzonation of Pekalongan is divided into 3 zones: Ground shaking prone zone I, characterized by very high amplification (>9 times), 0.93 – 1.15 second dominant period and soft sediment thickness between of 40.14 – 50.29 m; ground shaking prone zone II, characterized by high amplification (6-9 times), 0.55 – 1.49 second dominant period of second and soft sediment thickness between 23.91 – 65.30 m; ground shaking prone zone III, characterized by intermediate amplification (3-6 times), 0.47 – 1.54 second dominant period, and soft sediment thickness between 20.73 – 67.31 m.In generall, Pekalongan has amplification between 3, 17 – 12, 91 times. More than 50 % of its area has high amplification, some small spots/areas have very high amplification, and the rest area have intermediate amplification.Microzonation is as the preliminary step for earthquake risk mitigation efforts.In order to reduce the hazard risk, the local government must have policies on spatial planning. Regions which have high – very high amplification need to be developed with specific construction.Keywords: Pekalongan, microzoantion, amplification and predominant period
GEOLOGI BAWAH PERMUKAAN DATARAN KLATEN BERDASARKAN INTERPRETASI DATA MIKROTREMOR Marjiyono, Marjiyono; Ratdomopurbo, Ratdomopurbo; Suharna, Suharna; Zajuli, Moch. Heri Hermiyanto; Setianegara, Robby
Jurnal Geologi dan Sumberdaya Mineral Vol 15, No 1 (2014): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Dataran Klaten dan sekitarnya ditutupi oleh endapan fluvial vulkanik Merapi yang bersifat lepas. Hal ini menyulitkan dalam mengidentifikasi struktur geologi dibawahnya. Sehubungan dengan hal tersebut telah dilakukan pengukuran mikrotremor pada tiga (3) lintasan di daerah ini. Pengolahan data dilakukan dengan metode Horizontal to Vertical Spectral Ratio (HVSR, metode Nakamura) untuk mendapatkan penampang spektrum HVSR. Hasil pengolahan menunjukkan adanya pola struktur bawah permukaan berupa dataran, cekungan dan sesar normal yang berarah utara-selatan.Kata kunci : mikrotremor, HVSR, fluvial vulkanik Merapi, perioda/frekuensi resonansi, penampang spektrum.
PERCEPATAN PERGERAKAN TANAH MAKSIMUM DAERAH CEKUNGAN BANDUNG: STUDI KASUS GEMPA SESAR LEMBANG Handayani, Lina; Mulyadi, D.; Wardhana, Dadan D; H.Nur, Wawan
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 5 (2009): Jurnal Sumber Daya Geologi
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Abstract

The highly populated Bandung Basin needs a seismic hazard map, especially due to the existence of Lembang Fault on the north of the area. In this paper, the seismic hazard map was constructed based on calculation of peak ground acceleration (PGA) using Boore’s (1997) empirical attenuation relationship. The model was an assumed earthquake with moment magnitude (Mw) of 6 that was caused by Lembang Fault activity. Data input consists of velocity of seismic wave S, that was obtained through geological unit classification. The result shows three zones with highest PGA values: near the seismic source, lowland at the south of Bandung, and a small area at the west of Bandung.The most significant factors on high PGA values are the distance from the source of an earthquake and the geological unit of an area. Keywords: peak ground acceleration, Lembang Fault, Bandung Basin 
TINJAUAN ANALISIS GAYA BERAT TERHADAP BENTUKAN STRUKTUR BAWAH PERMUKAAN DI LEMBAR MEDAN, SUMATERA UTARA Nainggolan, D.A
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 4 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Regionally, tectonics of the Medan Quadrangle is occupied by mountainous and back-arc basin zones. Mountainous zone occupies the southwestern of the quadrangles, and is situated in the northwestern part of Kabanjahe, having Bouguer anomaly ranges from -70 to 0 mgals. Zone of back-arc basin occupying more than 50% of the area extends to the east into the Malacca Strait, having Bouguer anomaly ranges from 0 until +20 mgals. The qualitative and quantitative of Bouguer and residual anomalies represent numerous shapes of anticlinal and synclinal structure including faulting system having direction of northwest - southeast. Keywords : mountainous, back-arc basin, Malacca Strait, subsurface structure, Bouguer anomaly
MODEL DEFORMASI GETAS DI ZONA SESAR KALIGARANG, SEMARANG Fahrudin, Fahrudin; Winarno, Tri
Jurnal Geologi dan Sumberdaya Mineral Vol 22, No 2 (2012): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Tectonic activities in Semarang have resulted fault formations. A proper identification on faults and subsidiary structures will provide understanding on the kinematic and dynamic of the Kaligarang Fault. The Kaligarang Fault Zone has been formed since the Tertiary time with stress system orientation of σ1 = 37°, N158°E, σ2 =,45°, N12°E, σ3 = 30°, N244°E indicating left lateral displacement. Afterwards during Plio-Plestocene, the Kaligarang Fault Zone was reactivated with right lateral displacement as indicated by stress system orientation of σ1 = 51°, N185°E, σ2 = 30°, N205°E, σ3 = 8°, N275°E. Beside that, the linements at surroundings of the Kaligarang Fault have NEE-SWW until NWW-SEE directions. This structures were caused by the Unggaran activities.Keywords: Kaligarang Fault, stress system, reactivated, left lateral right lateral
PENGARUH TEKTONIK DAN IKLIM TERHADAP PERUBAHAN LINGKUNGAN ENDAPAN KUARTER DAERAH SUMPUR, SUMATERA BARAT Mulyana, Herman; M.Lumbanbatu, Ungkap; Moechtar, Herman
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 6 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Based on the depositional environment, the Quaternary deposits in the study area can be divided into five groups, i.e : (a) fluvial-channel deposits, (b) floodplain deposits (c) lake deposits, (d) transition/ tidal deposits, and (e) swamp deposits. Furthermore, this Quaternary deposits represent 3 (three) depositional intervals, namely Depositional Interval I-III.The development of the Quaternary environment and changes of basin fill in the research area were influenced by tectonic and climatic changes. Changes in climatological conditions, from the humid-subhumid into dry, probably due to global climatic changes following the Milankovitch cycles. While the vertical and lateral changes of environment systems could be influenced by reactivation of Singkarak-Solok fault segment. Keywords: Quaternary, tectonic, climate, environment
Methane Adsorption Characteristics of coals from Sambaliung area,Berau, East Kalimantan and Sawahlunto area, West Sumatra, Indonesia Anggayana, Komang; Kamarullah, Denny Reza; Suryana, Asep; Widayat, Agus Haris
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 4 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Investigation of methane adsorption capacity has been performed in Sambaliung Area, Berau, East Kalimantan (Latih Formation) and Sawahlunto Area, West Sumatra (Sawahlunto Formation). The study involves some analyses: methane sorption, petrography, and proximate. Adsorption isotherm analysis reveals storage capacity of Sambaliung and Sawahlunto coals about 113 to 269 scf/ton (daf) and from 486 to 561 scf/ton (daf), respectively. The adsorption capacity of the coals is thought to be related with formation pressure represented by depth as well as coal rank. The Sambaliung coal rank is low as indicated by the lower vitrinite reflectance (Rr about 0.38%) and higher total moisture (TM about 31%, ar). The Sawahlunto coal rank is higher as indicated by higher Rr (about 0.72%) and lower TM (about 6%, ar).
TEKTONOSTRATIGRAFI BUSUR BANDA LUAR DENGAN REFERENSI BAGIAN BARAT TIMOR LESTE DAN BAGIAN TIMUR PULAU SERAM Bachri, Syaiful
Jurnal Geologi dan Sumberdaya Mineral Vol 21, No 2 (2011): Jurnal Sumber Daya Geologi
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Abstract

Timor and Seram Islands are parts of the Banda Outer Arc which represent a collision zone between Northwest Shelf of Australia and the subduction system of the pre-collisional Banda Arc. Consequently, the rock units in this region can be catagorized into three different tectonostratigraphic sequences which represent differents origins. The first sequence is called the para-autochtonous sequence which is derived from NW Shelf of Australia, and is still lying on its basement, since the basement also moving northwards together with its sediment cover. The second sequence is pre-collisional Banda forearc sequence, and is called the allochtonous sequence, which overthrust on to the para-autochtonous sequence forming nappe structures. The third sequence is autochtonous sequence which is unconformably overlying the para-autochtonous and allochtonous sequences. The Bobonaro Complex in western part of Timor Leste can be compared with the Salas Complex in the Seram Island which represent the oldest aotochtonous unit forming olistostrom deposits. On the other hand, ophiolites in western part of Timor Leste can be compared with ultramafics rocks in eastern part of Seram Island, forming the basement of the allochtonous sequence. Meanwhile, the Lolotoi Complex in western part of Timor Leste can be correlated with the Kobipoto Complex in estern part of Seram Island, which form the basement of the para-autochtonous sequence.Key words: Para-autochtonous sequence, allochtonous sequence, autochtonous sequence, Banda outer arc, wester part of Timor Leste, Eastern part of Seram Island
Geokimia Batuan Gunungapi di Pulau Timor Bagian Barat dan Impikasi Tektoniknya Wahyudiono, Joko; Safri, Ildrem; Panggabean, Hermes
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 4 (2016): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Geologi wilayah Timor bagian barat berasal dari tiga mintakat yaitu Mintakat Benua Australia, Mintakat Busur Banda dan batuan yang terendapkan setempat. Pengambilan dan analisis conto batuan di Sungai Fatu dan Kompleks Mutis serta tambahan data sekunder dari Sungai Metan, Pulau Atauro dan batuan hasil Deep Sea Drilling Project (DSDP) bertujuan untuk mengetahui batuan asal wilayah Timor berdasarkan data geokimia batuan gunungapi dan implikasi tektoniknya. Metodologi analisis geokimia yang digunakan adalah X-ray fluorescence (XRF) dan Inductively Coupled Plasma–Mass Spectrometry (ICP-MS) untuk mengetahui unsur utama, unsur jejak dan unsur tanah langka dari batuan gunungapi. Unsur-unsur ini digunakan untuk klasifikasi batuan dan lingkungan tektoniknya.Hasil analisis geokimia conto batuan gunungapi dari Sungai Fatu dan DSDP berasal dari Benua Australia, sementara conto batuan dari Kompleks Mutis dan Sungai Metan menunjukkan Benua Asia atau Busur Banda seperti pada Pulau Atauro. Batuan basal dari Sungai Fatu terendapkan menjemari dengan batugamping Formasi Maubise berumur Perem dan merupakan Oceanic Island Basalt. Batuan basal dari Deep Sea Drilling Project (DSDP) secara geokimia termasuk subalkalin yang berasal dari pematang tengah samudera (Normal Mid Oceanic Ridge Basalt) berumur Jura.Kompleks Mutis pada Oligosen Miosen mengawali kolisi antara Benua Asia dengan Benua Australia. Batuan metabasal Kompleks Mutis menunjukkan komposisi kalk-alkalin yang mencirikan busur kepulauan. Conto batuan dari Sungai Metan dan Pulau Atauro terutama menunjukkan komposisinya subalkaline. Puncak kegiatan kolisi terjadi pada Akhir Miosen – Awal Pliosen dan berlanjut hingga sekarang. Busur Banda bagian dalam sebagian gunungapinya sudah tidak aktif lagi seperti yang terjadi pada Pulau Atauro.Kata kunci : geokimia, batuan gunungapi, mintakat, tektonik, kolisi, Timor

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