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Bulletin of Scientific Contribution : Geology
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 419 Documents
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DISTRIBUSI FORAMINIFERA BENTONIK SEDIMENPALEO TSUNAMI LETUSAN GUNUNG KRAKATAU BERDASARKAN DATA INTI BOR U-6 DI DAERAH UJUNGKULON BANTEN Fauzielly, Lili; Jurnaliah, Lia; Hamdani, A. Helman
Bulletin of Scientific Contribution Vol 12, No 2 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (725.642 KB) | DOI: 10.24198/bsc.v12i2.8368

Abstract

The presence of microfossils in sediments on mainland can explain the phenomenon of paleo –tsunami. Foraminifera bentonik as indicators of depositional environment used in this study. The purpose of this study was to determine the distribution of depositional environments of sedimentary origin eruption of Mount Krakatau tsunami . According this study, tsunami sediments can be recognized begin depth 90 -120cm . From Mikropaleontologi quantitative analysis from 12 samples of sediment,was obtained of 2635 individual and 55 species of foraminifera bentonik . The dominant species is Streblus becarii Linnaeus , Planulina wuellerstorfi Schwager , Bulimina marginata d' Orbigny , Bolivina spathulata Williamson , Elphidium lessonii d' Orbigny , Euuvigerina peregrina Cushman. Depositional environment of origin of tsunami sediments is shelf –bathyal and inner –shelf lagoon.
IDENTIFIKASI KONDISI FISIK AIR SUMUR DAN POLA ALIRAN AIRTANAH DANGKAL DI KECAMATAN SADANG KEBUMEN Hermawan, Nandian Mareta; Winduhutomo, Sueno; Raharjo, Puguh Dwi
Bulletin of Scientific Contribution Vol 17, No 1 (2019): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (725.061 KB) | DOI: 10.24198/bsc.v17i1.20201

Abstract

Secara geologi kecamatan Sadang termasuk kedalam kompleks melange Luk Ulo yang merupakan percampuran berbagai jenis blok batuan yang tertanam dalam massa dasar lempung hitam bersisik (scaly clay). Percampuran ini diakibatkan oleh proses subduksi lempeng benua Eurasia dan lempeng samudera Indo-Australia pada zaman kapur. Blok-blok batuan yang tertanam dalam massa dasar lempung hitam itu beraneka jenis, baik batuan sedimen, batuan beku dan batuan metamorf. Penelitian ini bertujuan untuk mengetahui kondisi fisik air bersih yang dipergunakan sehari-hari oleh masyarakat kecamatan Sadang dan pola aliran airtanah dangkalnya yang selanjutnya untuk mengidentifikasi konservasi airtanah.Pendekatan survei geologi dan pengamatan hidrogeologi di lapangan menghasilkan data pH, TDS dan suhu air bersih serta kondisi pola aliran airtanah dangkalnya. Hasil identifikasi kondisi fisik air bersih di daerah Sadang memperlihatkan variasi nilai pH, TDS dan suhu. Nilai pH air berkisar antara 6,4 – 8,7, dengan rata-rata pH 7,32. Nilai pH terendah tercatat di sumur penduduk (SP) 19 dan SP 23 dengan nilai 6,4, sementara nilai pH tertinggi tercatat di Bak Penampungan (BP) 3 dan BP 4 dengan nilai 8,7. Berdasarkan standar air baku Permenkes No. 32 tahun 2017, pH air baku berada pada kisaran 6,5 – 8,5. Sehingga di empat lokasi yaitu SP 19, SP 23, BP 3 dan BP 4, dimana nilai pH-nya diluar kisaran perlu menjadi perhatian. Secara keseluruhan daerah Sadang dan sekitarnya yang mempunyai nilai rata-rata pH 7,32 merupakan daerah dengan kondisi air yang baku, sedang variasi nilai TDS berkisar antara 29-190, dengan rata-rata TDS 95,87. Nilai TDS terendah tercatat di SP 9 sebesar 29 dan nilai TDS tertinggi tercatat di SP 26 sebesar 190. Berdasarkan standar air baku Permenkes No. 32 (2017), TDS air baku maksimal 500 mg/L. Nilai TDS tertinggi yang tercatat di daerah telitian sebesar 190 mg/L, tidak melebihi 500 mg/L, sehingga secara keseluruhan kondisi titik pengamatan termasuk kedalam air baku dari segi nilai TDS. Variasi nilai suhu berkisar 270C – 320C, dengan rata-rata suhu 28,750C. Nilai suhu terendah tercatat di SP 1, SP 9, SP 10, SP 12, SP 13 sebesar 270C dan nilai suhu tertinggi tercatat di SP 31 dan BP 4 sebesar 320C. Secara keseluruhan nilai suhu air daerah telitian sesuai dengan standar baku air bersih.Pola aliran airtanah di daerah telitian mengalir dari wilayah utara dan wilayah barat menuju wilayah timur dan wilayah selatan dengan ketinggian MAT di wilayah utara dan wilayah barat pada kisaran 55 mdpl semakin ke wilayah selatan dan wilayah timur ketinggian MAT semakin tinggi mencapai 219 mdpl.Kata kunci : geologi, air bersih, Sadang, pola pengaliran, akuifer, konservasi airtanah
PREDIKSI ARAH PENCEMARAN AIRTANAH AKIBAT TEMPAT PEMBUANGAN SAMPAH AKHIR DI DAERAH SARIMUKTI DAN SEKITARNYA KABUPATEN BANDUNG BARAT, PROVINSI JAWA BARAT -, Bombom R. Suganda, T.; -, Yan W. M. Iskandarsyah; -, M. Sapari Dwi Hadian,
Bulletin of Scientific Contribution Vol 10, No 1 (2012): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (676.029 KB) | DOI: 10.24198/bsc.v10i1.8276

Abstract

Geomorphology of the study area consists of rolling hills with slopes relief of moderate to rough. Slope toward south and southeast. The landfill site of Sarimukti are on steep hillsides, 16-25% slope, flanked by a ridge and ridge Sarimukti Margaluyu. What the study is about 100-400 meters from the highway west Rajamandala-Bojongmekar, Cipatat, West Bandung. Drainage pattern in this area is dendrito-parallel. Volcanic sediments underlying the landfill site of Sarimukti is lapili-tuff lithologies of Cibeureum Formation. This rock unit has a thickness of up to approximately 28 meters, consists of sandy tuff rock-gravelly (lapilli) and results of its wheatering, ie clayey-silt. Mixing the components in the form of lapili fragments. Based on hydrogeology, Sarimukti landfill and surrounding area has two aquifer systems, which are composed by rock aquifer sandy tuff, clayey-silt soils at the top of the unsaturated zone (aquifer was depressed / free) and aquifer half depressed / half-free, which has silty clay layer on the top of which belong to the layer aquitard. In this area the clayey silt soil hydraulic conductivity value is 10-3 cm / sec, while the sandy tuff rock layers at the bottom has a hydraulic conductivity of 10-2 cm / sec. Based on the topographic contour map and analysis estimated that the flow of groundwater in the area of landfill site Sarimukti and surrounding consists of four flow direction, the direction relative to the southeastern slope (hydraulic gradient) + 20-40%, towards the east with a slope of +10%, relative southwestern direction with a slope of + 10-20%, and the south with a slope of + 10%. Groundwater contamination that occurred in Sarimukti trend indicated by a pattern of chloride and bicarbonate ion plume to the southeast. The pattern of the spread of contamination is influenced by the direction of the slope of the tuff rock layers beneath the landfill and groundwater flow direction is affected, as well as the content of clay minerals in the bedrock around the landfill site (in the example of rock / soil only reach 54%, so the conservative anions such as chloride can still be move freely). Therefore, the selection of the location of landfills in the area Sarimukti is not good enough if it is not offset by the implementation of the system and monitoring the landfill
HOST ROCK AND MINERALIZED ORES GEOCHEMISTRY OF ARINEM VEIN, ARINEM DEPOSIT, WEST JAVA – INDONESIA Yuningsih, Euis Tintin
Bulletin of Scientific Contribution Vol 14, No 2 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1823.917 KB) | DOI: 10.24198/bsc.v14i2.9813

Abstract

Geochemically, the major, minor and trace elements play an important role in the various geological processes. The REE characteristics of quartz vein formed during main mineralization stage are representative of mineralization hydrothermal fluid REE compositions. The research concern the integrating geochemistry and mineralogy analyses. It is an ideal method to study the occurrence of gold deposits in the Arinem area. This area is located on the Java island as a part of West Java province of Indonesia. Detail exploration, including some drilling activities, is ongoing to define the gold and base metal reserve as well as the deposit characteristics. Thirty samples from different stage of mineralized body of Arinem vein, altered host rock from different core level, outcrop host rock, Miocene and Pliocene intrusions were analyses for its geochemical composition by using the Induced Couple Plasma (ICP) and Induced Couple Plasma Mass Spectrometer (ICP-MS). Emission Spectrometry was used to extend the lower detection limits and provide a broader spectrum of elements at the Acme Analytical Labortories, Canada.  The REE distribution in the altered host rock of the Arinem deposit indicated that the ΣREE enrichment in the altered host rock, with decreasing in its content from the host rock to the mineralized vein. The observed variations in mineralogy and mineral proportions indicate that Au and Ag came into being only during stage II (except for electrum also indicated at stage I), but that sphalerite, galena, pyrite, chalcopyrite and arsenopyrite were deposited during stages I and II. Keywords : altered host rock, Arinem vein, Geochemistry, Mineralized body, REE. Secara geokimia unsur-unsur utama, sedikit dan jejak (trace) memainkan peran penting dalam beragam proses geologi. Karakteristik unsur tanah jarang (Rare Earth Elements) dalam urat kuarsa yang terbentuk selama tahap mineralisasi utama merupakan representasi dari komposisi REE fluida hidrotermal. Pendekatan yang diterapkan dalam meneliti hal tersebut meliputi integrasi analisis geokimia dan mineralogi, yang merupakan suatu metode yang cukup ideal untuk mempelajari terjadinya deposit emas di Arinem. Daerah Arinem terletak di wilayah Jawa Barat bagian selatan, Indonesia. Eksplorasi detil, termasuk aktifitas pengeboran, sedang berlangsung untuk menentukan cadangan emas dan logam dasar serta karakteristik deposit. Dalam penelitian ini, tiga puluh sampel telah diambil dari tubuh vein Arinem dengan beragam tahapan mineralisasi dan dari batuan induk terubah dengan tingkatan yang berbeda dari inti ke arah luar, serta dari singkapan batuan induk, dan intrusi berumur Miosen dan Pliosen. Analisis untuk mengetahui komposisi kimia menggunakan Induced Couple Plasma (ICP) dan Induced Couple Plasma Mass Spectrometer (ICP-MS). Emission spectrometry digunakan untuk meningkatkan batas bawah deteksi dan memberikan spektrum unsur yang lebih luas. Seluruh analisis tersebut dilakukan di laboratorium “the Acme Analytical Labortories”, Canada. Distribusi REE pada batuan induk terubah dari deposit Arinem mengindikasikan bahwa terjadi pengayaan jumlah REE dalam batuan tersebut, sebaliknya terjadi penurunan kandungannya pada batuan induk yang mengalami mineralisasi vein. Hasil pengamatan menunjukkan bahwa proporsi mineral dan variasi mineraloginya mengindikasikan bahwa kehadiran Au dan Ag hanya terjadi pada tahap II (kecuali untuk elektrum juga diindikasikan pada tahap I). Sebaliknya sfalerit, galena, pirit, kalkopirit dan arsenopirit terbentuk selama tahap I dan II. Kata kunci: batuan induk terubah, vein Arinem, geokimia, tubuh termineralisasi, REE. 
SESAR LEMBANG DAN RESIKO KEGEMPAAN -, Agung Muljo; -, Faisal Helmi
Bulletin of Scientific Contribution Vol 5, No 2 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (343.624 KB) | DOI: 10.24198/bsc.v5i2.8139

Abstract

Lembang is located 30 kilometers from Bandung city, in fact, Lembang is one of the area which has earthquake gristle. Pursuant to result of remote sensing image that Lembang area passed by a long normal fault. Lembang Fault represent most potential for rock movement, this matter is caused by fault path represent a place that waving the earthquake. If the earthquake happen, the area along fault zone experience of bigger vibration. Strategic location which reside in in Lembang fault zona are Lembang Town, Market place, touris location of Maribaya, settlement area and etcetera.
IDENTIFIKASI STRUKTUR GEOLOGI BERDASARKAN ASPEK MORFOLOGI, STRATIGRAFI, POLA JURUS LAPISAN BATUAN DAN SEBARAN BATUAN : STUDI KASUS DAERAH BANTARUJEG-MAJALENGKA, PROVINSI JAWA BARAT Haryanto, Iyan; -, Nurdradjat; Saputra, Irdanto
Bulletin of Scientific Contribution Vol 13, No 2 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (863.939 KB) | DOI: 10.24198/bsc.v13i2.8400

Abstract

The study is located at Bantarujeg, Majalengka, West Java where tertiary sedimentary rocks are exposed. The depositional environment is concluded as shallow marine – deep water. In a present day, the sedimentary rocks are deformed and create a steep hills extending from west – east of the study area as a result of fault and folding processes. In some of the study area, deformed sedimentary rocks feature is resulted by sedimentation processes called slump. Various deformation model and interpretation on study area is often confuse geological history interpretation of study area. The main cause of folding in the study area may be adjacent to sedmentation processes or tectonic processes.The study is based on structural interpretation on topography map, drainage pattern, and digital elevation model analysis (DEM). Field observation is conducted to measure structural feature and identify sedimentology and morphology aspects.Structural geology Bantarujeg is expressed by steep hills morphology extending from west – east. The morphology is controlled by rock strike with rock dip measured from 30o-60o. In the middle of the depression (valley), layer dip generally above 40o shows the area is a result of compression and related to reverse fault. Local fold and drag fold is also founded on the reverse fault zone and in other location slump structure and local drag fold also identified. In general, the study area is a result of compression tectonic regime creating fold and thrust belt followed by tear fault deformation.
Interpretasi Lapisan Pasir Besi Menggunakan Metode Resistivitas Konfigurasi Dipole-Dipole di Kawasan Desa Pagubugan Kecamatan Binangun Kabupaten Cilacap Lestari, Tri Verawati Anggun; Sehah, Muhammad
Bulletin of Scientific Contribution Vol 18, No 1 (2020): 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.v18i1.26166

Abstract

Pasir besi merupakan salah satu sumberdaya alam yang terdapat di wilayah Indonesia, khususnya di kawasan pesisir Pulau Jawa. Pasir besi merupakan bahan baku yang memiliki peran penting bagi dunia industri, seperti industri baja, transportasi, pertahanan, properti, dan peralatan lainnya. Salah satu kawasan yang prospek pasir besi adalah Pesisir Desa Pagubugan, Kecamatan Binangun, Kabupaten Cilacap, Jawa Tengah. Survei Geofisika dengan metode geolistrik resistivitas di Pesisir Desa Pagubugan telah dilakukan untuk mengetahui sebaran dan kedalaman lapisan pasir besi, pada bulan Januari – Juni 2019. Konfigurasi elektroda yang digunakan dalam penelitian adalah dipole-dipole. Akuisisi data dilakukan pada tiga lintasan dengan panjang masing-masing lintasan sebesar 200 meter. Hasil pengolahan dan interpretasi data resistivitas menggunakan software Res2dinv 3.54 menunjukan bahwa batuan bawah permukaan di daerah penelitian terdiri atas empat lapisan; yaitu pasir, lanau, kerikil, dan kerakal yang berselingan dengan butiran bijih besi dengan nilai resistivitas berkisar >28,3 – >43,4 Ωm, endapan pasir besi dengan nilai resistivitas berkisar 20,1 – 43,4 Ωm, lempung pasiran dengan nilai resistivitas berkisar 10,1 – 26,0 Ωm, serta pasir lempungan dengan nilai resistivitas berkisar 5,10 –15,5 Ωm. Secara umum lapisan pasir besi tersebar merata di seluruh lintasan, dimana pasir besi diperkirakan berada pada lapisan kedua dengan kedalaman berkisar 8,5 – 13,5 meter
KARAKTERISTIK LAVA DAN KEMUNGKINAN PEMANFAATANNYA SEBAGAI BAHAN GALIAN KONSTRUKSI DAERAH MALIMPING KABUPATEN BANDUNG, JAWA BARAT Sukiyah, Emi
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 | Full PDF (545.29 KB) | DOI: 10.24198/bsc.v3i2.7452

Abstract

This research background are potency and limitation aspects in construction material resourcesapplication in southern part of Bandung Regency. The problem of research is role of lava characteristicin application designe as construction material resources. This research use deduction method withprobabilityapproach. Result of research show lava at Malimping area and surrounding have characteristicare grey-black, fine to intermediate texture, basaltic. A part of lava has sheeting joint and anothermassive. Based on petrographic analysis, a part of lava has a little alteration. That condition showed bya part of pyroxene had altered to chlorite. Result of chemical and physical analysis of rock show lava atMalimping area and surrounding is basalt. Potency of lava at Malimping is significane as contructionmaterial. Based on morphometry calculation and lava outcrop spreading, lava potency estimated44.573.500 m3. Nevertheless, that all potency can’t used because it spread in upper area of Citarumriver. Based on lava characteristics, outcrop position, regulation of landuse and trend of communityneed so that basalt lava potency used as dimention stone. That using can up value of contructionmaterial so that income of community in that surrounding area can up too.
PENENTUAN SPESIES FORAMINIFERA BENTONIK KECIL DOMINAN PADA PERAIRAN SEMARANG, PROVINSI JAWA TENGAH Nurani, Rina; Jurnaliah, Lia; -, Winantris
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 | Full PDF (535.941 KB) | DOI: 10.24198/bsc.v12i1.8364

Abstract

Twenty sea surface sediment samples are taken for research. Research area is located at Semarang Water and lied on 109º38’08,53’’ - 109º 43’31,57’’ BT and 05º 30’00’’ - 06º28’46,02’’ LS. Benthic foraminifera is marine unicellular animal that very useful to determine environment. The purpose of this research is to determine the genus of dominant small benthic foraminifera in order to interpret the environment. Based on quantitative method, result of the research shows total of genera is 29 with 145335 individual. Six genera which occur in all over samples are Ammonia, Anomalina, Asterorotalia, Elphidium, Heterolepa and Quinqueloculina. Genus Heterolepa is small benthic foraminifera dominant with total percentage individual is 35.957%. Based on the dominant genus, the environment of research area is marine (neritic).
GENESIS AMFIBOL PADA DIORIT PASIR CUPU, KECAMATAN PLERED, KABUPATEN PURWAKARTA, JAWA BARAT Arfiansyah, Kurnia; Helmi, Faisal
Bulletin of Scientific Contribution Vol 16, No 3 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1422.696 KB) | DOI: 10.24198/bsc.v16i3.18458

Abstract

Pasir Cupu secara administratif terletak pada Kecamatan Plered, Kabupaten Purwakarta, Propinsi Jawa Barat. Batas geografisnya terletak pada garis Bujur Timur 107o 26’ 25,2” – 107o 27’ 16,8” dan garis Lintang Selatan 6o 37’ 22,8” – 6o 37’ 03”.Batuan beku Pasir Cupu adalah batuan intrusi berbentuk bos, yang berjenis diorit (Streckeisen, 1978 dalam Gillespic and Styles, 1999). Dalam batuan ini terdapat amfibol, baik sebagai fenokris, dan masadasar. Jenisnya klinoamfibol (horenblenda dan lamprobolit) ; berbentuk euhedral dan anhedral ; memiliki pleokroisme lemah sampai kuat ; berkembar sederhana, jamak, dan penetrasi ; pemadaman bergelombang ; serta bertekstur zona, korona, dan koroded. Pembentukan amfibol ini melalui dua fasa kristalisasi, yaitu amfibol fenokris, dan inklusi pada fasa pertama, dan amfibol masadasar pada fasa ke dua.Kata kunci : Amfibol, diorit, pasir cupu, purwakarta.

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