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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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KARAKTERISTIK AKUIFER DI KAWASAN PROSPEK BIJIH BESI PESISIR DESA KARANGTAWANG KECAMATAN NUSAWUNGU KABUPATEN CILACAP BERDASARKAN DATA RESISTIVITAS-2D Sehah, Muhammad; Raharjo, Sukmahaji Anom; Vickramdani, Muhammad
Bulletin of Scientific Contribution Vol 16, No 3 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The research to investigate the characteristic of aquifer using the 2D-geoelectrical resistivity method has been done in the iron ore prospect area of Nusawungu West Coastal, Cilacap Regency. The background of the research is the abundant potential of iron sand in this village which prospects are exploited. The 2D-resistivity data acquisition was carried out in March – April 2018 in four locations determined based on the prospect zone of iron ore from the local magnetic anomaly map of the research area. Based on the results of modeling and interpreting resistivity data, the potential of iron ore in the research area is quite large. In each trajectory of measurement, sand was found which was interpreted to contain iron ore with resistivity values ranging from 21.7 – 56.7 Ωm. The sand containing iron ore is also the main medium of the shallow groundwater aquifer layer in the research area. The characteristics of aquifers in the research area are quite good where the condition of the residents' well water is abundant, does not taste salty, has never experienced drought even during the dry season, but is thought to contain iron (Fe). If the exploitation of iron sand is carried out on a large scale, it will result in reduced sand and other rocks making up aquifers. As a result the function of aquifers in storing and flowing groundwater in the research area has decreased.

DIVERSITAS FORAMINIFERA BENTONIK KECIL DI DAERAH PERAIRAN SEMARANG (LEMBAR 1409) JAWA TENGAH -, Lia Jurnaliah
Bulletin of Scientific Contribution Vol 9, No 3 (2011): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Location of seafloor sediment is Semarang waters (sheet map of 1409), Central Java. Geographically, research area is in coordinate 109°30'-111°00' and 06°00' - 07°00'.Twenty samples of two phi seafloor sediment were examined in order to know diversity of small benthic foraminifera. Based on quantitative analysis, small benthic foraminifera are composed of 7 Order, 27 Families, 38 Genus, 57 Species, and 235889 Specimen. The calculation of index diversity are shown between 0,3 - 1,

PERBANDINGAN SOIL IMPROVEMENT PADA TANAH LAPUKAN BATUAN VULKANIK DI JATINANGOR, KABUPATEN SUMEDANG, DAN TANAH LAPUKAN BATUAN VULKANIK DI CIGINTUNG, MALAUSMA, KABUPATEN MAJALENGKA Zakaria, Zufialdi; Sophian, Irvan; Chaniago, Aulia Eka P S
Bulletin of Scientific Contribution Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRACTSoil improvement is one of the methods of soil reinforcement. One method of soil improvement is the addition of soil with lime (CaO). The swelling soil (expanding when wet conditions, and shrinking when dry conditions) is identified from the value of soil activity. The behavior of soil activity decreases with increasing CaO, but for soils in weathered volcanic areas (volcanic breccia and lava) as in Jatinangor, with the value of high soil activity, the optimum addition of CaO to the soil is 15% and not more than 20%. Excessive addition of CaO tends to change the behavior of soil activity and increase the rate of activity. In the soil from weathered volcanic rock (tuff) as in Cigintung Village, District Malausma, in Majalengka, with the value of moderate to high soil activity, the addition of CaO is 15% to 20%. More than 20% CaO, activity number (A) decreases, but cohesion (c, Kg/M2) will decrease too, so the strength of soil will decrease. Keywords: swelling, activity number, soil improvement, ABSTRAKPerbaikan tanah (soil improvement) adalah salah satu metode perkuatan tanah. Salah satu metode soil improvement adalah penambahan tanah dengan kapur (CaO). Tanah yang bersifat swelling (mengembang bila basah dan mengerut bila kering) diidentifikasi dari nilai aktivitas tanahnya. Perilaku aktivitas tanah berkurang dengan bertambahnya CaO. Untuk tanah di daerah lapukan vulkanik (breksi vulkanik dan lava) seperti di Jatinangor, dengan nilai aktivitas tinggi, penambahan CaO yang optimum pada tanah mengembang adalah 15 % dan tidak lebih dari 20 %. Penambahan CaO yang berlebihan cenderung mengubah perilaku aktivitas tanah dan meningkatkan kembali angka aktivitas. Pada tanah lapukan batuan vulkanik (tuff) seperti di desa Cigintung, Kecamatan Malausma, di Kabupaten Majalengka, dengan aktivitas tanah sedang sampai tinggi, penambahan CaO cukup 15% sampai 20%. Lebih dari 20% CaO, maka angka aktivitas turun, namun kohesi akan turun pula sehingga kekuatan tanah justru akan berkurang. Kata kunci: swelling, angka aktivitas, perbaikan tanah

TEKTONIK BATUAN PRA-TERSIER JAWA BARAT -, Iyan Haryanto; -, Aldrin Ramadian; -, Faisal Helmi
Bulletin of Scientific Contribution Vol 7, No 2 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The Pre-Tertiary Melange is the oldest rocks outcrop that found in Ciletuh area. Stratigraphically, this mélange is basement rock that overlaid unconformity by Tertiary sedimentary rocks, i.e. Ciletuh and Jampang FormationThe outcropping mechanism of Pre-Tertiary rock in this area due to up-tilting, thrusting and folding that followed by sliding. The product of sliding is represented by a elongate scarp toward the sea..

STUDI GEOLOGI DAN GEOFISIKA POTENSI HIDROKARBON FORMASI AIR BENAKAT LAPANGAN X CEKUNGAN SUMATERA SELATAN Simorangkir, Fenry; Haryanto, Iyan; -, Nurdrajat; Firmansyah, Yusi
Bulletin of Scientific Contribution Vol 13, No 1 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

X field is part of the South Sumatra Basin with an area of 359,6 km2. This study is focused to discuss potential hydrocarbons in x fiels. In this study, the discussion will be focused on the Air Benakat Formation. The method used is based on the interpretation of seismic and well. Based on the results of the analysis of the petrophysic of the FS, HA, and BS well shows average Netpay on Air Benakat Formation is 180 m, with a cut-off Volume Shale 0.4, cut-off PHIE 0.12 and cut-off Saturation Water 0.71. As for the Netpay from reservoir itself is average 12.415 m. Geological modeling based on the results obtained by petroleum leads three zone with two reservoir zones. For reservoar A, the most potentially zone is the zone of Lead-1 with with a resources amount of 716.82 MMBO, Zone of Lead-2 with a resources amount of 398.89 MMBO, and zone of Lead-3 with a resources amount of 108.14 MMBO. For resevoar B, the most potentially zone is the zone of Lead-1 with a resources amount of 662.13 MMBO, Lead-2 Zone with a total resources of 368.46 MMBO, and zone of Lead-3 with a total resources of 99.89 MMBO.

PALYNOSPORE PADA LAPISAN BATUBARA FORMASI BAYAH, RANGKASBITUNG Winantris, .
Bulletin of Scientific Contribution Vol 17, No 3 (2019): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Batubara Formasi Bayah hingga kini masih menjadi objek pertambangan rakyat. Anlaisis palynospore diambil dari batubara yang berada di Desa Sindang Ratu, Rangkas Bitung, Banten. Lokasi tersebut merupakan daerah penambangan rakyat. Berdasarkan referensi dinyatakan bahwa Formasi Bayah berada pada rentang umur Eosen hingga Oligosen, diendapkan pada lingkungan paralik. Penelitian ini bertujuan melakaukan verifikasi umur relatif formasi bayah dan lingkungan purba berdasarkan analisis palynospore. Pemisahan polen dan spora dari batubara dilakuakn dengan metode standar asam. Jenis polen penanda umur reltaif yang ditemukan meliputi Proxapertites operculatus, Proxapertites cursus, Polygalacidites clarus dan Verrucatusporites usmensis. Berdasarkan asosiasi taksa tersebut menunjukkan bahwa terbentuknya Formasi Bayah di lokasi penelitian pada Eosen akhir yang diendapkan di lingkuang rawa air tawar dengan penciri lingkungan didominasi Dicopopollis malesianus.

PENYELIDIKAN PENDUGAAN GEOLISTRIK UNTUK PENELITIAN AIR TANAH, DI ASRAMA RINDAM - SENTANI, KABUPATEN JAYAPURA, PROPINSI PAPUA -, Geni Dipatunggoro; -, Yuyun Yuniardi
Bulletin of Scientific Contribution Vol 11, No 2 (2013): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Geo-electric investigation is done at Asrama Rindam areal, Sentani Resort, Jayapura Regenc, Papua Province. The investigationis required to detection of rock and subsurface condition. Methode of geo-electric to support for groundwater investigation to use the soldier need at the Asrama Rindam, Sentani Resort, The vertical layer are layer-1 as the soil, layer-2 as tufaceous brecia, laye-3 as tufaseous sand, layer-4 as tufaseous brecia, layer-5 as volcanic brecia, layer-6 as tufaseous sand, and layer-7 as volcanic brecia. The rock layer groundwater potencial or reservoar are tufaseous sand at the 10 meter and 49 meter depth.

KARAKTERISTIK GEOMORFOLOGI GUNUNG API AKTIF DAN GUNUNG API PADAM: KASUS G. MERAPI & G. GAJAHMUNGKUR, DAERAH ISTIMEWA YOGYAKARTA DAN JAWA TENGAH Hartono, Hill G.; Sudradjat, Adjat
Bulletin of Scientific Contribution Vol 16, No 2 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The volcanic morphology provides the information about the history of the genesis and activities of an active volcano which is still developing as demonstrated by Merapi strato volcano in Special Provinve of Yogyakarta and Central Java. The purpose of the present study is to reveal the history of the geomorphology of the dormant volcano (such as Gajahmungkur volcano, Wonogiri) based on the comparative study of the active volcano (Merapi volcano, Yogyakarta). The method in this study is the application of geological principle “the present is the key to the past” in the geology of a volcano. In general the volcanological facies concept reflects the ideal morphology of Merapi volcano. The central facies with the slope of 300 to 400 and the smooth surface; medial facies with the slope of 200 to 300 reflecting rough surface and the distal facies manifested in a relatively flat angle between 100 to 200 where the deposition of volcanic materials and lahar takes place. The boundary between the facies is delineated by a break in slope which also reflects the radial drainage pattern and the boundary of vegetation

PALEONTOLOGI FORMASI NYALINDUNG -, Syarifin
Bulletin of Scientific Contribution Vol 9, No 1 (2011): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Nyalindung area is known for its collection of abundant mollusca fauna. That fossils are contained in the sandstone and silt. Nyalindung area became a location type for Nyalindung Formation. Nyalindung Formation spread from the north district Nyalindung, there is along Cimandiri drainage area, to Bantarkalong Village and Cimerang high plains. This formation is spread to Bojonglopang shoutheastern, there is along the road of Nyalindung-Bojonglopang.Determination of age based on the collection of molluscas. Found 18% of Recent species that show Miocene age, based on clues fossil prompts (Siposiprarea caputviverae and Vicaria veurnelli Calossa) that indicate of Middle Miocene age. Based on forams L. (tribiolepidina) ruteeni and L. (tribiolepidina) kalahabensis showed Tf-3 age. Deposition environment of Nyalindung Formation based on lithology, paleontology and sedimentary structures. As a whole of deposition occurs in the open sea in the vicinity of Cileungsir river to estuaries up around the marshy area of western and eastern section investigation.

Stratigrafi Sikuen Formasi Jatiluhur di Cekungan Bogor, Jawa Barat Abdurrokhim, .
Bulletin of Scientific Contribution Vol 15, No 2 (2017): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRACTThe Jatiluhur Formation that exposed in the northern part of the Bogor Trough consists of a mixture of carbonate and siliciclastic sedimentary rocks. The very well outcrops are exposed in some parts of the Cipamingkis and Cileungsi Rivers, about 20 km to the northeast from Bogor City. The formation is characterized by mudstone dominated facies that consist of interlaminated siltstones, claystone and thin-bedded sandstones, and locally interbedded with thick-bedded sandstone, thick-bedded limestone, slump deposits, slump scar-fill deposits and channel-fill deposits.Thick-bedded sandstones and slump deposits common found in the lower part of succession, while carbonate intervals are developed in the middle and upper part of the formation. The formation is interpreted to have been developed during middle–late Miocene in slope and shelf margin settings.Overall the succession that exposed in both the rivers represent shallowing upward of the formation, which where overlain, in turn, by a deeper succession in the middle part, as a response of single relative sea level fall and rise.Keyword: Jatiluhur, Stratigraphy, Thick-bedded, sequenceABSTRAKSingkapan Formasi Jatiluhur di bagian utara Cekungan Bogor (utamanya pada Sungai Cipamingkis dan Sungai Cileungsi, Bogor) memberikan kesempatan untuk meneliti urut-urutan batuan ini. Formasi Jatiluhur pada daerah penelitian ini disusun oleh batulempung dan batulanau dengan sisipan tipis batupasir halus sampai sedang. Pada beberapa interval juga bersisipan dengan batupasir tebal sampai sangat tebal, batugamping tebal sampai sangat tebal, endapan slump, endapan pengisi slump-scar dan endapan channel.Sisipan batupasir tebal sampai sangat tebal, endapan slump, endapan pengisi slump-scar dan endapan channel umumnya dijumpai di bagian bawah formasi ini. Sedangkan sisipan batugamping dijumpai di bagian tengah formasi, yang kemudian ditutup kembali dengan perselingan batulempung, batulanau dan lapisan tipis batupasir pada lingkungan yang lebih dalam.Secara keseluruhan Formasi Jatiluhur dicirikan dengan urut-urutan litologi yang mendangkal ke atas, yang kemudian berubah kembali secara gradual mendalam, sebagai respon dari perubahan turun dan naiknya relative permukaan air laut (fall and rise of relative sea level)Kata kunci: Jatiluhur, stratigrafi, Tebal sisipan, sekuen

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Contact Name Muhammad Kurniawan Alfadli

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Muhammad Kurniawan Alfadli

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m.kurniawan@unpad.ac.id

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+6285669298592

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Kota bandung,

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