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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 387 Documents

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SISTEM PANAS BUMI DAERAH KALAWAT, KABUPATEN MINAHASA UTARA, PROVINSI SULAWESI UTARA Riza Asyari Yamin; Aton Patonah; Adi Hardiyono; Muhammad Nur Hadi
Bulletin of Scientific Contribution: GEOLOGY Vol 13, No 1 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Kalwat Geothermal Field administratively is located in North Minahasa District, North Sulawesi Province. Litologies of this research area divided by pyroclastic flows and lava. The heat source of this location comes from Mahawu Mountain that located in the southwest outside the research area. Lithology which acts as the cap rock layer is form by pyroclastic flow that has clay minerals which impermeable. Based on petrographic and PIMA abalysis, the alteration minerals that arise are dominated bu montmorillonite and halloysite, so the alteration type of this research area is argilic type and located at the northwest and southwest of research area. The water type that appears are dilute chloride-bicarbonate type and bicarbonate type. Based on the calculation of paleotemperature and geothermometer, there is increase of temperature during the form of mineral and the recent temperature. This is due to increased of volcanic activity in the research area. This research area is water-dominated and moderate temperature system that has range of temperature at 209-2100 C.

PENENTUAN DISTRIBUSI SLIP DAN ASPERITAS GEMPABUMI MENGGUNAKAN METODE INVERSI GELOMBANG BADAN TELESEISMIK STUDI KASUS: GEMPABUMI LOMBOK Mw 6,9 (9 AGUSTUS 2018) Ramadhan Priadi; Admiral Musa Julius; Iman Suardi
Bulletin of Scientific Contribution: GEOLOGY Vol 17, No 3 (2019): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Pada tanggal 9 agustus 2018 terjadi gempa signifikan dengan magnitude 6,9 (14:56:28 UTC). Gempa bumi tersebut merupakan salah satu gempa dari rangkaian gempabumi Lombok pada periode bulan Juli-Agustus 2019. Diduga jika gempabumi Lombok disebabkan oleh adanya aktivitas back-arc thrust namun masih sulit untuk menginterpretasikan penyebab utamanya. Salah satu cara yang dapat dilakukan untuk mengetahui apa yang terjadi disumber dengan melakukan inversi moment tensor. Inversi moment tensor dilakukan untuk memisahkan waveform yang tercatat di seismogram dari fungsi raypath dan instrument sehingga diperoleh waveform di sumber. Metode yang digunakan dalam melakukan inversi moment tensor adalah metode teleseismic body wave inversion. Gelombang teleseismik dipilih karena gelombang teleseismic memiliki frekuensi gelombang rendah akibat dari penjalaran yang jauh sehingga frekuensi tinggi sudah teratenuasi selama penjalaran gelombang gempabumi. Komponen BHZ digunakan karena gelombang P terekam jelas di komponen Z. Stasiun seismik yang digunakan merupakan stasiun seismik dengan jarak antara stasiun ke sumber berkisar antara - sehingga diperoleh rekaman sinyal gelombang teleseismik. Dari hasil pengolahan diperoleh parameter sesar yaitu strike , dip , dan rake . Perbandingan antara sinyal observasi dan sinyal sintesis menghasilkan varian sebesar 0,1687. Luasan bidang sesar dari hasil inversi diestimasikan sebesar strike 48 km × dip 42 km. Pada gempabumi ini diperoleh momen seismik sebesar 0.428E+20 Nm. Magnitudo moment yang dihasilkan dari proses inversi adalah 7,02 dengan kedalaman 28 km. Dari hasil inversi diperoleh jika jenis patahan yang terjadi merupakan merupakan jenih patahan reverse (naik) dengan source duration selama 45 s. Slip maksimum yang dihasilkan dari proses inversi adalah 1,05 m. Dari hasil slip diketahui jika pada gempabumi Lombok 6,9 terjadi desakan dari arah selatan ke utara. Hal tersebut juga diperkuat dengan adanya asperitas tinggi di wilayah utara Lombok. Wilayah sekitar gunung Agung memiliki daerah-daerah dengan asperitas tinggi. Daerah dengan asperitas tinggi mengindikasikan jika wilayah tersebut merupakan wilayah dengan zona kuncian yang tinggi. Zona kuncian tersebut memiliki energi yang besar ketika release. Karena zona asperitas terbesar berada di utara Lombok dan menerima desakan dari arah selatan maka diindikasikan jika memang back-arc thrust merupakan penyebab utama gempa bumi Lombok.

KARAKTERISTIK BATUAN BEKU ANDESIT & BREKSI VULKANIK, DAN KEMUNGKINAN PENGGUNAAN SEBAGAI BAHAN BANGUNAN DAERAH UKIR SARI, KECAMATAN BOJONEGARA KABUPATEN SERANG, PROVINSI BANTEN Adi Hardiyono -
Bulletin of Scientific Contribution: GEOLOGY Vol 11, No 2 (2013): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The purpose study to recognize compatibility utilization igneous rock and volcanic breccia in research area based on rock characteristic and rock engineering properties. Igneous and volcanic breccias in the study area can be used as a basic building materials but need to be investigated compatibility use in accordance with the characteristics and properties owned engineering standards prevailing rock.

PENGARUH TEKTONIK PADA LEMBAH SUNGAI CILIWUNG DENGAN PENGUKURAN GPS- RTK BERDASARKAN NILAI VALLEY-FLOOR RATIO (Vf) Retno Witjahjati; Emi Sukiyah; . Winantris; Pulung P Arya; Bani Nugroho
Bulletin of Scientific Contribution: GEOLOGY Vol 16, No 2 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc geology.v16i2.18171

Most of Jakarta's Special Capital Region (DKI) has relatively flat topography covered by alluvial deposit. Alluvial deposit derives from rock deformation of volcanic activity in the south, and also coastal deposits at the north part. The upstream rivers located in hilly, mountainous terrain, as well as through sloping hills to the lower plains downstream. The relatively rapid flow velocity in the upstream forms the parallel pattern and the downstream are slowly forming a sub dendritic pattern until it empties into the Jakarta Bay. Ciliwung River is one of 13 rivers passing through DKI Jakarta.The morphology of DKI Jakarta area is formed by exogenous energy caused by highly intensive sedimentation and human activities. In addition, there is also endogenous energy to produce folds and fracture structures. The presence of endogenous power results from the convergence interaction between the Indian-Australian Ocean Plate and the Eurasian Plate.This research was conducted to find out the influence of endogenous power in the form of tectonic control on the pattern of landscape shape in DKI Jakarta. The manifestation of these endogenous influences can be seen in the morphological formation in the Ciliwung River. The method used is calculated of morphometry with a value of the VF - ratio (Valley Floor Ratio) from topographic measurement using GPS-RTK device (Global Position System - Real Times Kenematic). Measurements were made as many as 7 trajectories on the river banks in order to know the difference of elevation on the left and right side. Based on the calculation, the Vf value ranged from 1.65 to 3.47. Through these results, it can be concluded that the morphology of DKI Jakarta is controlled by tectonic process with medium category.

STRUKTUR GEOLOGI PADA ZONA TRANSISI ANTARA BUSUR VOLKANIK BUKIT BARISAN DENGAN CEKUNGAN BELAKANG BUSUR : CONTOH DI DAERAH SUMATRA UTARA Iyan Haryanto -
Bulletin of Scientific Contribution: GEOLOGY Vol 9, No 1 (2011): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Structural pattern in Sumatra controlled by oblique subduction between Eurasian Plate with Indo-Australian Plate, resulting the structure dominated by strike-slip dextral faults. According to the position of subduction, the strike slip fault generally trending northwest-southeast.The older faults that already formed in the basement rocks (pre-rift) reactivated become normal faults under the influence of transtensional (syn-rift). This tectonic process then produce some tertiary sedimentary basin in the adjacent area. Furthermore, in the Late Tertiary it is reactivated again under the influence of transpressional (post-rift). This later tectonic event cause all sedimentary rock strongly folded and faulted, followed by magmatism/volcanism activity. This whole tectonic activity produced the Barisan Mountain Range.The transpressional process created high and low area, which could make the basement rock uplifted and separate the distribution of tertiary sedimentary in the different locations.

DOMAIN GEOLOGI SEBAGAI DASAR PEMODELAN ESTIMASI SUMBERDAYA NIKEL LATERIT PERBUKITAN ZAHWAH, SOROWAKO, KABUPATEN LUWU TIMUR, PROVINSI SULAWESI SELATAN Deni Hernadi; Mega Fatimah Rosana; Agus Didit Haryanto
Bulletin of Scientific Contribution: GEOLOGY Vol 15, No 2 (2017): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRACTGood quality geochemistry data (Assay) reflects on geological modeling of lateritic resource geology guaranted. Strengthen of the geological modeling process is absolutely influenced by the Exploratory Data Analysis (EDA) process which aims to separate the geological domains of laterite deposits based on the characteristic of geochemistry, the weathering material and the lateral and vertical lithology composition of the laterite nickel deposits on Zahwah Hill study area, Sorowako, Luwu Timur Regency, South Sulawesi Province. Identification of population distribution of simple geochemical data based on graph of histogram, scatter plot and terniary diagram is a powerful tool to facilitate and separate nickel laterite domains. The impact of domain generalization will provide an overview of the geological model based on natural conditions of nickel laterite deposit, which will be constructed the process of mineral resource estimation based on zonation more reliable. Understanding nickel laterite weathering process is an essential and complementary fundamental trought dissociate geological domain of nickel laterit concept. Base on identification Zahwah hill lithology consist of ultramafic rock; harzburgit and dunit, chareterized by low serpentinized into unserpentized rock. Where the content of silica is very abundant and spread evenly on study diarea. The enrichment of Nickel ore in laterite deposits is found in the -1-inch material fraction only. In general, the geological domain of nickel laterite deposit on Zahwah hills Block Model Laterite Nickel Resources are separated into 3 parts of the limonite zone, saprolite zone and bedrock zone. Keyword: domain, geochemistry, laterite, nikel, saprolite ABSTRAKKualitas data geokimia (Assay) yang baik mencerminkan terhadap penjaminan pemodelan geologi sumberdaya laterit. Kekuatan proses pemodelan geologi sangat dipengaruhi oleh proses Exploratory Data Analysis (EDA) yang bertujuan memisahkan domain geologi endapan laterit berdasarkan karaktersitik geokimia, material hasil pelapukan dan litologi penyusun baik lateral maupun vertikal pada endapan Nikel laterit pada area Penelitan Perbukitan Zahwah, Sorowako, Kabupaten Luwu Timur, Provinsi Sulawesi Selatan. Identifikasi distribusi populasi data geokimia secara sederhana berdasarkan grafik histogram, scatter plot dan terniary diagram merupakan media yang ampuh untuk memudahkan dan memisahkan domain Nikel laterit. Dampak generalisasi domain akan memberikan gambaran model geologi berdasarkan kondisi natural endapan nikel laterit sehingga akan memudahkan proses estimasi sumberdaya mineral berdasarkan zonasi. Pemahaman tentang teori pelapukan endapan nikel laterit merupakan konsep penting yang mendasar dan saling melengkapi terhadap proses memisahkan domain geologi laterit. Berdasarkan identifikasi litologi penyusun Perbukitan Zahwah merupakan batuan ultramafic yaitu batuan Harzburgit dan dunit. Dengan tingkat serpentinisasi rendah hingga tak terserpentinisasi. Dimana kandungan silika sangat melimpah dan tersebar merata diarea penelitan. Pengayaan bijih Nikel pada endapan laterite hanya terdapat pada material fraksi -1 inci. Proses domain geologi endapan nikel laterit pada Blok Medol Sumberdaya Nikel laterit Perbukitan Zahwah secara umum dipisahkan menjadi 3 bagian yaitu zona limonit, zona saprolit dan zona bedrock. Kata kunci: domain, geokimia, laterit, nikel, saprolit

POTENSI BIJI BESI DI DAERAH AMBULANGAN, BANJAR, KALIMANTAN SELATAN Cecep Yandri Sunarie
Bulletin of Scientific Contribution: GEOLOGY Vol 6, No 2 (2008): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Research area is located in Ambulangan, Banjar regency of South Kalimantan province. The research is aimed to indentified and mineral inventory of Iron Ore deposit, as well as primary or secondary type ore deposit. Morphology of the area is generally covered by hilly volcanic terrain with elevation below 650 m above sea level, the drainage pattern is mainly sub-parallel.Litology of the study area is covered mainly by Cretaceous rocks consists of Sediment, volcanic and andesitic intrusion.The iron ore occurred as primary and secondary type deposit. The primary type is exposing as vein like structure of approximately 6 m width and 50 m long, where as the secondary type is exhibiting as boulder or lateritic soil. Chemical analysis of primary iron ore indicated the ore grade is about 66.37% and 62.99% for secondary iron ore.

ALTERASI DAN MINERALISASI DAERAH GUNUNG BULEUD, DESA GARUMUKTI, KECAMATAN PAMULIHAN, KABUPATEN GARUT, PROVINSI JAWA BARAT Rangga Suteja; Mega Fatimah Rosana; Adi Hardiyono
Bulletin of Scientific Contribution: GEOLOGY Vol 14, No 2 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Research area is located in Garumukti, Pamulihan Region, Garut District, West Java Province. The purpose of this research is to determine alteration zone and mineralization type of the research area. Research methods include field observations survey and continued by laboratory analysis (petrography, mineragraphy and SWIR Terraspec analysis). The result indicated, there are three alteration zones: sub-propylitic (chlorite, illite, muscoivite, smektite-illite, muscovitic-illite), advance argilic (kaolinite, dickite, pyrophyllite) and silicification zone (quartz, cristobalite, chalcedony). Thin vein < 5 cm width, show quartz texture of mosaic/saccharoidal, colloform-crustiform bands, bladed and granule. Dissemination, interlocking and vein-like ore texture are found in this research area on pyrite, chalcopyrite and sphalerite. The mineral alteration assemblages of the deposit indicated that this research area is epitermal high sulphidation. Keyword: Gunung Buleud. Alteration, Mineralization, Epithermal High Sulphidation Daerah penelitian terletak di Desa Garumukti, Kecamatan Pamulihan, Kabupaten Garut, Provinsi Jawa Barat. Penelitian bertujuan untuk mengetahui tipe alterasi dan mineralisasi serta sebarannya di daerah penelitian. Metode penelitian yang dilakukan adalah pemetaan geologi dan analisis laboratorium (analisis petrografi, mineragrafi dan SWIR Terraspec). Berdasarkan hasil penelitian di lapangan dan analisis laboratorium daerah penelitian terbagi menjadi tiga zona alterasi yaitu zona sub-propilitik (klorit, ilit, muskovit, smektit-ilit, muskovit-ilit), zona argilik lanjut (kaolinit, dikit, piropilit) dan silisifikasi (kuarsa, kristobalit, kalsedon). Terdapat vein tipis (<5 cm) dengan tekstur berupa mosaic/saccharoidal, colloform-crustiform bands, bladed dan granular. Sementara pada zona silisifikasi setempat2 terdapat tekstur vuggy. Tekstur mineral bijih yang ditemukan meliputi diseminasi, interlocking dan vein-like. Mineral bijih yang di temukan di daerah penelitian berupa mineral pirit, kalkopirit dan sfalerit. Tipe endapan alterasi mineral daerah penelitian mengindikasikan tipe endapan epitermal sulfida tinggi. Kata kunci: Gunung Buleud, alterasi, mineralisasi, epitermal sulfida tinggi

RUNTUNAN STRATIGRAFI SEDIMEN KUARTER KAITANNYA TERHADAP PERUBAHAN GLOBAL SIRKULASI IKLIM DAN TURUN-NAIKNYA MUKA LAUT DI LEPAS PANTAI BARAT KEPULAUAN KARIMATA (KALBAR) Herman Moechtar -
Bulletin of Scientific Contribution: GEOLOGY Vol 5, No 1 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The Quaternary sediments in the studied area can be divided into: (a)qollovial of basement rocks, (b)fine-grained of mass flows deposits, (c)coarse-grained of mass-flow deposits, (d)marine sediments, (e)beach deposits, (f)floodbasin deposits, (g)young marine sediments, and (h)marine Recent sediments. Furthermore, the Quaternary sediment consists of 2 (two) depositional cycles namely west Karimata cycle (SKB.1) and west Karimata cycle 2 (SKB.2).The development of the Quaternary sediments and basin fill in the research area was influenced by global events. Changes in climatological conditions between more humid and more dry, and relative sea-level changes affect marine and coastal depositional environments were included by global changes. The style of the mass flow deposits, is primarily the result of the palaeoslope on the basin, and lateral and vertical changes of environment systems were inflenced by regional or local condition of Sundaland character.

THE FOSSIL ASSEMBLAGE FEATURES OF LIMESTONE AND CLASTIC SEDIMENTARY ROCK IN LULUT AREA, CILEUNGSI DISTRICT, BOGOR, WEST JAVA Vijaya Isnaniawardhani -; Rusman Rinawan -; Bambang Prianggoro -
Bulletin of Scientific Contribution: GEOLOGY Vol 10, No 2 (2012): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The geological mapping for limestone and clastic sedimentary rock in Lulut area was conducted. The study area was composed of claystone, siltstone, sandstone and limestone intercalations of Jatiluhur Formation formed within neritic setting in Middle Miocene age. This section interfingers with rich coral and algae limestone of Klapanunggal Formation.Larger foraminifera (Milliolids, Nummulites spp., Amphistegina spp., Operculina spp., Cycloclypeous spp.), globigerinids, calcareous red and green algae, corals, Molllucs and Brachiopods shell fragments were recorded in biogenic limestone. The marine invertebrata fossil assemblages (Molluscs, Brachiopods) as well as shallow marine trace fossils (skolithos, cruziana) were recorded in calcareous claystone, siltstone, sandstone and bioclastic limestone. Planktic and small benthic foraminifera assemblages were found in fine clastic sedimentary rock.The identified larger foram, globigerinids, coral and calcareous algae assemblages associated with invertebrate shell fragments can be indicated age and environmental of limestone. Based on the fossil assemblages and morphology characteristics of the study area, the limestone was formed in back-reef zones (northern part, at Bagogog-Cilalay); reef-crest (central part, at Pasir Bali, Kutalingkung, Sibancana, Kuari D); and fore-reef zones (southern part, at Cileungsi, Ciseah). In the southern part, claystone interlaminations and intercalations are commonly recorded. The reef complex grew in Tertiary age within neritic zone.Some index planktic foraminifera (Globigerinoides primordius, Globigerinoides ruber, Globorotalia continousa, Globorotalia siakensis, Globorotalia mayeri, Hastigerina siphonifera and Orbulina suturalis) recorded in carbonaceous clastic sedimentary rock indicated that sedimentary rock of Jatiluhur sections deposited within Middle Miocene Zones N.9 to N.14. Benthic and planktic foraminifera assembalges in the sections indicated that the sediments were deposited in neritic setting. This is supported by the appearance invertebrate fossils and trace fossils.

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Muhammad Kurniawan Alfadli

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m.kurniawan@unpad.ac.id

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