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Bulletin of Scientific Contribution : Geology

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Published by Universitas Padjadjaran

ISSN : 16934873 EISSN : 2541514X DOI : doi.org/10.24198/bsc%20geology.v18i1

Core Subject : Science, Social, Engineering,

Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Environmental Science

BSC Geology adalah jurnal yang dikelola oleh Fakultas Teknik Geologi Universitas Padjadjaran,terbit 3 kali dalam setahun (April, Agustus, dan Desember), yang menerbitkan karya tulis ilmiah dalam bidang kebumian terutama yang berkaitan dengan geologi seperti : Petrologi Paleontologi Geomorfologi Stratigrafi Geologi Dinamik Geologi Lingkungan dan Hidrogeologi Geologi Teknik Geokimia Geofisika Sedimentologi. Setiap artikel yang akan diterbitkan adalah bersifat tanpa biaya (no processing charges dan no submission charges). Dewan redaksi dan penerbit tidak pernah meminta bayaran untuk penerbitan pada jurnal ini. Tujuan dari jurnal ini adalah untuk memperkaya pengetahuan dan informasi tentang ilmu kebumian dan dapat dimanfaatkan untuk kemaslahatan bersama.

Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi

Articles 413 Documents

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PERAN TATA GUNA LAHAN TERHADAP DISTRIBUSI TINGKAT KERAWANAN EROSI DI KAWASAN CILETUH JAWA BARAT Sulaksana, Nana; Sjafrudin, Achmad; Sukiyah, Emi; Raditya, Pradnya P.; Abdulah, Fikri; Setiyanto, Puguh
Bulletin of Scientific Contribution Vol 13, No 2 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Ciletuh located in Ciemas district, Sukabumi, West Java is known by its geological diversity (geodiversity). This area is located at the southwestern of Java Island and directly adjacent to the Indian Ocean. Ciletuh is a very attractive tourist visits area and deserve to be visited. This area is planned to be a National Geopark area and Global Geopark Network in 2016. This will certainly have an impact on the change of land use in the next few years. The change of land use will affect indirectly to the distribution of erosion rate in research area. The higher of land use changes, the higher of erosion rate that can cause environmental quality degradation. This research aims to reveal the land use changes can affect the level of of vulnerability to erosion in Ciletuh. This research method uses laboratory and studio analysis. Remote sensing analysis is used to delineate land use. The distribution rate of erosion in research area can be known through erosion calculation formula. Based on delineation of land use, Ciletuh have areas of land cover consisting of 6.666.104 m2 (9,7%) plantation, 10.444.567 m2 (15,2%) forests, 3.252.843 m2 (4,7%) settlements, 82.264 m2 (0,1%) swamps, 22.863.874 m2 (33,3%) paddy fields, 19.474.346 m2 (28,37%) bushes, 2.057.689 m2 (2,9%) vacant lands, and 3.788.699 m2 (5,5%) moors area. The result of early research identification indicates that the level of vulnerability to erosion associated with the greatest land cover is moor and vacant lands.

KAJIAN GEOLOGI BAWAH PERMUKAAN FORMASI KARANGSAMBUNG SERTA FORMASI TOTOGAN DAN HUBUNGANNYA DENGAN AKUIFER AIRTANAH DI DESA KALISANA KABUPATEN KEBUMEN Mareta, Nandian; Ansori, Chusni
Bulletin of Scientific Contribution Vol 18, No 1 (2020): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

AbstractKarangsambung-Totogan Formation is the most exposed rock unit in Kalisana Village, Karangsambung, Kebumen. These two formations also form the bedrock of the study area, which consists of claystone. The Karangsambung-Totogan Formation is composed of sedimentary groups which are mixed up due to the gravity process known as Olistostrome. Pieces of centimeter to hundreds of meters of sedimentary rocks are scattered randomly during the scaly clay matrix. Kalisana Village is around 20 kilometers from the center of Kebumen Regency. Kalisana Village has an area of 349 hectares, with 109.86 hectares of rice fields and 239.14 hectares of dry land. Rice field area consists of irrigated and non-irrigated rice fields. Every year this research area often experiences water shortages during the dry season. The purpose of this study is to get a reference in making decisions to overcome the shortage of raw water in areas affected by drought through groundwater sources. The research methods include the preparation stage (literature study, previous research studies, preparation of tools, review of maps, etc.), field orientation, field work/measurements, data compilation, data analysis, evaluation and data processing. The results obtained three geological rock units namely; claystone associated with the Karangsambung Formation, a fragmented claystone unit associated with the Totogan Formation and breccias associated with the Waturanda Formation. Based on the geoelectric sonding results at three sounding locations, a subsurface image is obtained. At first sonding was found sandstones at depth of 11-18 meters with an aquifer thickness of about 7 meters. Correlation of tree geoelectric sonding location successfully described the subsurface of the Karangsambung-Totogan Formation which forms the base. The maximum geoelectric depth is around 120 meters. Keyword: Karangsambung Formation, Totogan Formation, Karangsambung, Geoelectric, aquifer AbstrakFormasi Karangsambung-Totogan merupakan satuan batuan yang paling banyak tersingkap di Desa Kalisana, Karangsambung, Kebumen. Dua formasi ini juga menjadi batuan alas di lokasi penelitian, yang terdiri dari batulempung. Formasi Karangsambung-Totogan tersusun oleh kelompok sedimen yang tercampur aduk karena proses pelongsoran gaya berat yang dikenal dengan istilah Olistostrome. Bongkah-bongkah batuan sedimen berukuran centimeter hingga ratusan meter tersebar secara acak dalam masadasar lempung hitam bersisik (scaly clay). Desa Kalisana berjarak sekitar 20 Kilometer dari pusat Kabupaten Kebumen. Desa Kalisana mempunyai luas 349 Ha, dengan luas lahan sawah 109,86 Ha dan lahan kering seluas 239,14 Ha. Luas lahan sawah terdiri dari sawah irigasi dan non-irigasi. Setiap tahun lokasi penelitian ini sering mengalami kekurangan air saat musim kemarau. Maksud penelitian ini adalah mendapatkan acuan dalam pengambilan keputusan untuk mengatasi kekurangan air baku pada daerah yang terdampak kekeringan melalui pencarian sumber airtanah. Metode penelitian meliputi tahap persiapan (studi pustaka, studi penelitian terdahulu, persiapan alat, penelaahan peta-peta, dan lain-lain), orientasi lapangan, pekerjaan lapangan/pengukuran, kompilasi data, analisis data, evaluasi dan pengolahan data. Hasil yang didapatkan berupa tiga satuan batuan geologi yaitu; batulempung yang berkorelasi dengan Formasi Karangsambung, satuan batulempung berfragmen yang berkorelasi dengan Formasi Totogan dan breksi yang termasuk Formasi Waturanda. Berdasarkan hasil geolistrik di tiga lokasi sounding didapatkan gambaran bawah permukaan. Di lokasi sonding 1 ditemukan lapisan batupasir pada kedalaman 11-18 meter dengan ketebalan akuifer sekitar 7 meter. Korelasi 3 titik sonding geolistrik berhasil menggambarkan bawah permukaan Formasi Karangsambung-Totogan yang menjadi alas tersebut. Kedalaman maksimal geolistrik sekitar 120 meter.Kata kunci: Formasi Karangsambung, Formasi Totogan, Karangsambung, Geolistrik, akuifer

PENELITIAN STRUKTUR GEOLOGI DAN KAITANNYA TERHADAP KEMUNGKINAN ADANYA POTENSI EMAS PRIMER DAERAH GUNUNG ASTANA BOGOR, JAWA BARAT Haryanto, Iyan
Bulletin of Scientific Contribution Vol 3, No 2 (2005): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v3i2.7454

The study area that is mainly hilly, contains volcanics matters such as breccias, tufaceous lapili, tufand lava. Several outcrops are followed by mineralization where quartz vein also occurred.Developed structures in the study area are quite complex, where NE – SW faults pairing with NW –SE faults. Mineralization zones and quartz vein are found on faults segments, these evidence shows thatthere are primary Au prospect at the subsurface in the study area.

POTENSI ENDAPAN EMAS SEKUNDER DAERAH MALINAU, KALIMANTAN TIMUR Hardiyono, Adi
Bulletin of Scientific Contribution Vol 12, No 1 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v12i1.8359

The purpose study to recognize and interprete resources of gold deposit in Long Agung, Malinau District, East Kalimantan Province. The field work also to interprete system of gold deposit in research area.

Pengaruh Kontrol Struktur Geologi Daerah Vulkanik terhadap Aliran Air Tanah di Daerah Gekbrong, Kabupaten Cianjur, Provinsi Jawa Barat Ismawan, Ismawan; Hendarmawan, Hendarmawan; Hutabarat, Johanes; Isnaniawardhani, Vijaya
Bulletin of Scientific Contribution Vol 16, No 3 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Aliran air dari hulu ke hilir dipengaruhi oleh berbagai hal, terutama adalah jenis batuan penyusun di daerah resapan serta intensitas deformasinya. Kombinasi struktur sesar dan kekar dapat memodifikasi variasi permeabilitas dari sangat permeabel (akuifer bagus) sampai dengan sangat kedap (akuiklud). Tujuan penelitian ini yaitu untuk mengetahui kondisi geologi, baik kondisi geologi permukaan maupun bawah permukaan yang terdiri atas batuan penyusun, tatanan tektonik dan pola strukturnya serta pengaruhnya terhadap aliran airtanah. Secara administratif daerah penelitian meliputi daerah Kecamatan Gekbrong, Kabupaten Cianjur, Provinsi Jawa Barat.Daerah penelitian dibagi menjadi 3 satuan geomorfologi, yaitu Satuan Geomorfologi Tubuh Gunungapi Strato, Satuan Geomorfologi Kaki Gunungapi Strato dan Satuan Geomorfologi Perbukitan. Urutan satuan stratigrafinya, dari yang tua sampai yang muda, adalah Satuan Breksi Tuff, Satuan Breksi Vulkanik, Satuan Tuff Breksian, Satuan Lava Andesit dan Lava Basaltik. Batuan di daerah penyelidikan umumnya berasal dari endapan volkanik dan dapat dikelompokan berdasarkan kisaran nilai tahanan jenisnya. Sesar-sesar yang ada di permukaan adalah : Sesar Gekbrong, Sesar Cibeleng dan Sesar Cipadang, ketiganya berarah relatif baratdaya – timurlaut, sedangkan sesar di bawah permukaan berarah timurlaut – baratdaya tidak diberi nama. Daerah resapan dibatasi sesuai dengan batas sesar yang berarah timurlaut – baratdaya, mengindikasikan bahwa sesar ini bertindak sebagai sealing fault.Kata Kunci: Gekbrong, Endapan Vulkanik, Struktur Geologi, Daerah Resapan, Resistivitas

STRATIGRAPHY REVIEW OF KUNINGAN AREA IN RELATION TO THE PETROLEUM POTENTIAL -, Edy Sunardi
Bulletin of Scientific Contribution Vol 9, No 3 (2011): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The West Java area is part of back arc basin comprising a number of North-South oriented half graben and sub-basin situated at the southernmost edge of the Sunda Platform. The area chosen for this study is called as Kuningan Area, located at the Bogor Trough, which has a complete sequence of rifting events. However, limited wells are available; therefore, a basin fill history could not be identified.It is predicted that this area has a hydrocarbon potential. Play concepts in the Northwest Java Basin, especially focused on syn-rift and post-rift sediments, whilst in the past they concentrated on carbonate build-ups on structural highs and the Jatibarang volcanics.In the offshore of NW Java Basin, to the north of this area, the proven oil and gas province are scattered in the several sub-basins such as Northwest Java Basin and Arjuna Basin. A number of different plays as shown in structural cross section in W-NE direction of the West Java Basin show the presence of extensive block faulting in the basement forming graben-like structures. The deposition of carbonate build-up is clearly indicated as Baturaja Formation in the lower part and Parigi Formation in the upper part. It is hoped that this configuration extends to the Kuningan Area which is mostly covered by thick Quaternary volcanic rocks.

SURVEI MAGNETOTELURIK DAERAH PANAS BUMI MARANDA, KABUPATEN POSO, PROVINSI SULAWESI TENGAH Awaludin, Winarno; Hutabarat, Johanes; Syafri, Ildrem; Sugianto, Asep
Bulletin of Scientific Contribution Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRAKSurvei Magnetotelurik (MT) telah dilakukan di daerah panas bumi Maranda yang terletak di Kabupaten Poso, Sulawesi Tengah. Pola struktur geologi di daerah Maranda didominasi oleh arah utara-selatan yang berasosiasi dengan arah sesar naik Poso yang berada di bagian baratnya dan pola struktur berarah relatif barat-timur sebagai antitetiknya. Hasil perhitungan dengan geotermometer silika baik pada kondisi conductive cooling maupun adiabatic cooling menunjukkan nilai yang hampir sama dimana suhu reservoir berdasarkan geotermometer kelompok mata air panas Maranda berkisar antara 125-184°C. Tujuan survei ini adalah untuk mengetahui struktur tahanan jenis bawah permukaan yang berkorelasi dengan sistem panas bumi. Pengukuran MT di daerah panas bumi Maranda telah dilakukan pada 42 titik ukur yang tersebar membentuk 8 buah lintasan berarah baratdaya-timurlaut dengan jarak antar titik ukur sekitar 1000 m. Peta tahanan jenis (MT) memperlihatkan adanya pola kelurusan berarah baratlaut-tenggara dengan sebaran tahanan jenis tinggi di sebelah baratdaya dan sebaran tahanan jenis rendah di sebelah timurlaut. Batuan penudung yang dicirikan dengan nilai tahanan jenis rendah berada di sebelah timurlaut di antara mata air panas Maranda dan mata air panas Kawende dengan pola yang membuka ke arah timurlaut. Batuan penudung ini diperkirakan berada di dekat permukaan hingga kedalaman 750 meter dengan ketebalan 500-750 meter. Kata kunci: magnetotelurik, panas bumi, Maranda, Sulawesi Tengah ABSTRACTMagnetotelluric (MT) surveys have been conducted in the Maranda geothermal area located in Poso District, Central Sulawesi. The geological structure pattern in the Maranda region is dominated by the north-south direction associated with the Poso thrust fault in the west and the structures pattern of relative east-west trending as their antithetes. The results of calculations with silica geotherm meter in both conductive cooling and adiabatic cooling conditions show almost the same value that the reservoir temperature based on the geothermometric of the Maranda hot springs ranges from 125-184 ° C. The purpose of this survey is to knowing the structure of the subsurface resistivity that correlates with the geothermal system. Measurements of MT in geothermal Maranda have been done on 42 scattered points forming 8 trajectory direction southwest-northeast with the distance between the measuring point about 1000 m. The type resistance maps (MTs) show an alignment pattern in northwest-southeast direction with high resistance range in the south-west and low-end resistance range to the northeast. The cap rocks that are characterized by low-end resistance values are northeast of Maranda's hot springs and Kawende's hot springs with a pattern that opens to the northeast. The cap rocks are estimated to be near the surface to a depth of 750 meters with a thickness of 500-750 meters. Keywords: magnetotelluric, geothermal, Maranda, Central Sulawesi

MINERALISASI PADA BREKSI HIDROTERMAL, DAERAH TEPU, TAMBANG EMAS TERBUKA KELIAN, KECAMATAN LINGGANG BIGUNG, KABUPATEN KUTAI BARAT, PROPINSI KALIMANTAN TIMUR -, Antonius Bambang Yuniarto; -, Ildrem Syafri
Bulletin of Scientific Contribution Vol 7, No 2 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

This research was carried out at the southern pit wall in the open gold mining area of PT. Kelian Equatorial Mining, located at 00 00 '32, 56 "S - 00 05 '09, 14" South Latitude and 1150 23’ 29,02" - 1150 28' 04,73" East Longitude. Administratively, it located in the Tepu area, Subdistrict of Linggang Bigung, West Kutai, East Kalimantan province. Physiographically that area is a part of Central Kalimantan volcanic arc.Rocks exposed in this area can be divided into 4 (four) rock units, i.e. The Eocene Sandstone Unit; The Lower Miocene Andesitic Pluton Unit; The Middle Miocene Hydrothermal Breccia Unit; and The Early Miocene Diatreme Breccia Unit.Geological structures that developped in this area were joints and faults. The faults are dilational structures types, in the form of sinistral- and dextral normal faults. These geological structures facilitated the penetration of andesite, followed by the appearence of hydrothermal fluids which produced the formation of hydrothermal breccia, and diatreme breccia. Hydrothermal breccia fragment consisting of andesite and sandstone, usually in jigsaw textured which are arranged in a matrix rock flour (Sillitoe, 1985), i.e. very fine grained material that came from milling process of breccia fragments. The carbonate minerals in the form of bladed texture are dominat minerals that filled the interfragments and matrix cavities. Partially, apart of carbonate minerals, the bladed silica was also present in cavity filling. The cavity filling minerals are associated with the appearence of metallic minerals.The alteration zones in the research area can be grouped into three zones, namely: 1.) Zone containing chlorite + clay + sericite + adularia + carbonate 2.) Zone containing sericite + carbonate + clay + adularia ± quartz and 3.) Zone containing carbonate + clay + sericite + adularia + quartz / silica. These alterations are classified as subpropylitic - until phyllic zones (Corbett & Leach, 1996). Metal mineralization such as sphalerite, galena, pyrite, covellite, arsenopyrite and chalcopyrite are associated with carbonate alteration ± adularia ± quartz ± sericite ± clay were primarily formed as a cavity filling and veins in hydrothermal breccia. The analysis results of Au and Ag contents in some rocks samples of hydrothermal breccia ranged from 0.04 grams / ton to 8.96 grams / ton Ag and 0.55 to 11.8 grams / ton, while the recovery of Au ranged between 16.08% up to 85.12%. The highest content and % recovery value of Au was founded in hydrothermal breccia.The mineralization stages can be divided into three stages: 1). The pre-brecciation stage that associated with the occurence of chlorite, sericite, adularia, clay and pyrite dissemination as well as the formation of carbonate veinlets and quartzs in direction of the Northwest - Southeast, 2) The syn-brecciation stage, it related to the formation of hydrothermal breccia, i.e. the occurence of carbonate and silica enrichment and the alteration minerals such as sericite, adularia, clay that related to the deposition of base metals as cavity filling and as veinlets in the direction of Southwest-Northeast. 3) Post-breccia stage was related to the occurence of carbonate veinlets ± base metals which associated with the clay minerals. Those cut the fragments, rock flour matrix, cavities filling minerals in hydrothermal breccia after the their formation in the direction of Southwest-Northeast.Mineralization in the area of study occured as ore deposits in hydrothermal breccia and in the veins as well as the veinlets. Hydrothermal breccia formed by two processes, i.e.; structural control and high-pressure hydrothermal fluids, at the temperature more than 200° - 250° C, with the acidity condition of (pH) 6, 6-8, 3. This condition is classified as a system of low sulphidation that related to porphiry with gold-carbonate base metal deposits (Corbett & Leach, 1996).

SISTEM PANASBUMI BERDASARKAN ANALISIS GEOKIMIA AIR PANAS DAERAH AMOHOLA DAN SUMBERSARI, KECAMATAN MORAMO, KABUPATEN KONAWE SELATAN, PROVINSI SULAWESI TENGGARA Aprilia, Fitriani Dewi; Yuningsih, Euis Tintin; Patonah, Aton; Rezky, Yuano; Yushantarti, Anna; Nurdin, Asep
Bulletin of Scientific Contribution Vol 13, No 1 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The research area is located in Amohola and Sumbersari, Moramo sub-district, Konawe South regency, Southeast Sulawesi Province. Geographically located between 122°35’6,07" – 122°45'58,94" BT dan 4°5'20,28" – 4°16'10,85" LS. The research areas have a stratigraphy consisted of Meta-limestones, Phylite, Schist, Quartzite, Conglomerates, Limestones, Carbonate Sandstone, Claystone, and sediment surface. Hot waters have temperatures ranging from 37,5oC to 50oC. The fluid geochemical data affirm that the Amohola area has Chloride type of water, which indicates it is close to the heat source, whereas in Sumbersari area has Bicarbonate water type, which indicates that the fluid has affected by meteoric water. Geothermal system in these two areas assumed that has separated by tectonic activity and the emersion of the lithology affected the chemical content of the hot fluid. The Geotermometer indicates that the subsurface of Amohola manifestations temperatures are around 146°C (medium enthalpy), whereas in Sumbersari 43°C (low enthalpy).

ANALISIS GEOLOGI TEKNIK PADA KESTABILAN LUBANG BUKAAN TAMBANG BAWAH TANAH MENGGUNAKAN METODE LEMEN HINGGA Adnyano, A.A Inung Arie; Fallah, Rizqi Fahrizal
Bulletin of Scientific Contribution Vol 17, No 3 (2019): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Salah satu permasalahan yang sering dihadapi pada sistem penambangan bawah tanah adalah kestabilan lubang bukaan. Potensi ketidakstabilan yang terjadi pada lubang bukaan bawah tanah akan selalu membutuhkan penanganan khusus terutama untuk menjaga keselamatan pekerja, dan mencegah terganggunya produksi (Koesnaryo, 1999). Kestabilan lubang bukaan dan peranan ketebalan pilar yang ditinggalkan berkaitan erat dengan penggunaan sistem penyangga. Peranan pilar penting untuk aktifitas penambangan, semakin tipis pilar yang ditinggalkan, semakin besar perolehan bijih, akan tetapi potensi terjadi keruntuhan akan semakin besar. menunjukan bahwa pilar harus kuat dan mampu menahan beban dalam jangka waktu tertentu agar proses penambangan dapat berlangsung dengan baik. Maka dari itu, diperlukan analisis kestabilan dan dimensi pilar agar resiko akibat ketidakstabilan dapat teratasi. Penelitian ini dilakukan di CKN_975_XC12_STH PT. Cibaliung Sumberdaya, yang terletak di Kecamatan Cimanggu, Kabupaten Pandeglang, Provinsi Banten. Penelitian ini dilakukan untuk mengetahui kekuatan batuan yang digali dengan memperkiran nilai Faktor Keamanan (FK) lubang bukaan. Pengklasifikasian batuan dilakukan dengan RMR system dan nilai FK diperoleh menggunakan kriteria keruntuhan Mohr-Coulomb. Pemodelan lubang bukaan dengan menggunakan metode elemen hingga. Berdasarkan karakterisasi massa batuan disekitar lubang bukaan adalah terkekarkan kelas IV (poor) dengan kisaran nilai RMR 30 – 35. Lubang bukaan yang diteliti adalah Sistem penyangga existing CKN_975_XC12_STH double drift dengan jarak 5 meter layak digunakan.Kata Kunci : geoteknik, tambang bawah tanah, faktor keamanan.

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