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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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APLIKASI TEKTONIK LEMPENG DALAM SUMBER DAYA MINERAL, ENERGI DAN KEWILAYAHAN -, Zufialdi Zakaria
Bulletin of Scientific Contribution Vol 5, No 2 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Indonesian Region have the condition of complicated tectonic. Indonesian Archipelago is represent meeting of Pacific Plate and Indian-Australian Plate (in Eastern Indonesia), and also Eurasia Plate and Indian-Australia Plate (in Western Indonesia), and also smaller plate ( Caroline Plate and Philippine Sea Plate).Plate boundaries can be estimated by zone of active earthquake, zone of mass movement in mountain region, zone of volcanism, zone of magmatisme, and zone of hydrocarbon.Estimation of plate tectonic boundary is important to support an investigation and research of mineral resources, energy resources, and terrain resources can be predicted. On land resources study, plates tectonic boundary is most important to anticipate of geological disaster.

MANAJEMEN AIRTANAH PADA ENDAPAN ALUVIUM RAWA LAKBOK, JAWA BARAT Hadian, Sapari Dwi; Rahmat, Bombom
Bulletin of Scientific Contribution Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Rawa Lakbok revealed as depression of Citanduy River, developed as peat swamp with type B overflow. Geographically, area of study located on 108° 35’ 29,3” – 108° 36’ 34,6” east longitude and 7° 23’ 33” – 7° 24’ 37, 7”south latitude. Area of study located on Puloerang Village, Sub-district of Lakbok, District of Ciamis, West Java. Geology success-ion of study area will be described in several aspect; Geomorphology, Stratigraphy, and Geological history. Geomorphologically, area of study consist of alluvium plain unit, and moderately steep volcanic unit From stratigraphy aspect, area of study consist of sandstone unit (Tpbp), Andesite unit (Tpa), and Alluvium unit (Qa). With Structural Geology heading South East – North West. Geological history of study area began in Early Pliocene with deposition of sand material. Afterwards, volcanic activity occurred and erupted andesite lava. At the end, alluvium was deposited as response of depression which formed in area of study.From the water balance calculation at Cibeber rivers area with width ± 10.12 kM2, known that : precipitation value 2,805.82 mM/Annual, 58.48% of pouring rain will evaporate, 21.11% will be run off, and 6.25% will infiltrate into the soil. Study area have 17.92% (5,088,437.2 M3/Annual) of axcess water of depression storage, means amount of water that accumulate in the surface of depression bowl from the study area surface run off. Hidrogeology of study area consist of hydraulic gradient values ranging from 0.0008 – 0.004. Hydraulic T Parameter ranging from 5 – 10 M2/day, K values ranging from 1 – 5 M/day, S value ranging from 1 – 5, and Sc value ranging from 17 – 37 M3/day/Mdd. Influence radius of Cone of depression rangingfrom 1.2–2 M. Keywords: depresion zone, groundwater manajemen

VALUASI BAHAN GALIAN GOLONGAN C (BGGC) DI KABUPATEN CIREBON DITINJAU DARI PENGELOLAAN DAN INVESTASI Sulaksana, Nana
Bulletin of Scientific Contribution Vol 4, No 1 (2006): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

In order to optimize the ability of mineral resources which are utilized to give people a more prosperous life, we need not only an adequate mining management which is appropriate with the characteristic of the mineral resources but also a stocktaking of the existence of the mineral resources in a form of map information which is included in a work identification and a mapping of mineral potencies. Exploiting the mineral resources optimally by maximizing added values and minimizing negative impacts of mineral resources exploitation, will increase the PAD (Original Local income) and labour absorption. Therefore, research continuity is essential to create in order to collect the basic information of the mineral potencies, especially constructive and industrial deposits, hopefully it will be able to support the exploitation activity. Work identification and mapping of a mineral potency represents the most basic need now, considering that Cirebon Regency has to be ready to implement the Local Autonomy based on the constitution number 22 Year 1999st, especially in a mining field. The result of the work identification will become a basic and main force for the Mining and Energy Department in Cirebon Regency in order to promote its natural resources and to accelerate duties on mine workings building and supervision.

KOEFISIEN AIR LARIAN BERDASARKAN PENUTUPAN VEGETASI DAN PENGUKURAN DEBIT ALIRAN SUNGAI CEKUNGAN PENGALIRAN SUNGAI (CPS) CITARIK HULU Haryanto, Edi Tri
Bulletin of Scientific Contribution Vol 12, No 1 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Upper Citarik Catchment has an area of about 30,41 Km2 or around 30.000 Ha. Based on topographic map “Rupa Bumi Indonesia”(RBI), the upper area of the catchments still covered by forests which can restrain the increase of runoff coefficient.There is also water fall “Curug Cinulang in the Catchment, the interesting natural tourist attractions that push the growth of economic activities and tourism facilities, changing land use which can increase runoff coefficient and improve flow discarge. The research method used was land use mapping based on the Topographic Map “RBI” with scale of 1 to 25000, and measurements of each land use types using GIS techniques. Discharge estimation using empirical formula and measurements in the field. The results showed dense forest cover, plantations, and scrub affect the coefficient runoff. Forests affect the stability of the river flow based on measurements and calculations with different assumptions rainfall intensity. The river discharge was relatively stable at stations 6 and 7 with more than 90% of land covered by good forest.

IDENTIFIKASI PROSPEK ANDESIT MENGGUNAKAN METODE GEOLISTRIK DI KECAMATAN CILAKU, KABUPATEN CIANJUR, JAWA BARAT ilmi, irpan; Taufan, Yoqi Ali; Denis, Mutebi; Nur, Andi Agus; Syafri, Ildrem
Bulletin of Scientific Contribution Vol 16, No 3 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Survei geolistrik ini dilakukan untuk mengetahui sebaran batuan andesit dan perlapisan pasir yang terdapat dibawah permukaan (di dalam bumi). Batuan tersebut memiliki nilai tahanan jenis kelistrikan (resistivitas) yang berbeda antara material-material lainnya dengan memanfaatkan sifat kelistrikan batuan untuk memetakan kondisi geologi di bawah permukaan. Kegiatan survei 2D geolistrik dilakukan selama 4 hari, yaitu dari 14-17 November 2017, di Kecamatan Cilaku, Kabupaten Cianjur, Jawa Barat. Pengukuran geolistrik ini dilakukan dengan menggunakan metoda resistivity konfigurasi Wenner dua dimensi, seta penyelidikan dilakukan sebanyak 21 lintasan pengukuran berarah Utara – Selatan, titik elektroda 0 berawal di utara dan titik elektroda 48 di selatan. Dari hasil pengukuran dan pengolahan data lapangan dapat dibuat model 2D penampang geolistrik untuk setiap lintasan, peta anomali lateran kedalam, dan 3D gabungan dari seluruh lintasan. Anomali sebaran di daerah penyelidikan dapat di bagi dalam beberapa kelompok anomali yaitu : 1. Anomali rendah, dengan kisaran nilai resistivitas 0 Ωm - 30 Ωm yang -menyebar pada kedalaman 0 – 10 m. Anomali ini di tandai dengan warna biru, di duga lapisan zona akuifer pasir terisi air. 2. Anomali sedang, dengan kisaran nilai resistivitas 30 Ωm - 90 Ωm. Anomali yang diduga lapisan pasir, lempung dan anomali ini juga dapat berupa pasir lempungan dengan banyak konkresi yang bersifat gampingan. Pada kedalaman 40-50 m lapisan ini terdapat menyebar di utara daerah penyelidikan. 3. Anomali tinggi dan sangat tinggi, dengan kisaran anomali lebih dari 100 Ωm. Anomali ini terdapat di tenggara daerah penyelidikan. Anomali ini ditandakan warna merah yang merupakan daerah paling menarik untuk untuk dijadikan prospek.Kata kunci : Geolistrik, Andesit, Cilaku, Resistivitas, Model 2D

KARAKTERISTIK SUNGAI DI SEKITAR WILAYAH RAWAN LONGSOR DAS CITANDUY -, Zufialdi Zakaria; -, Irvan Sophian; -, Febri Hirnawan
Bulletin of Scientific Contribution Vol 9, No 3 (2011): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Characteristics of the river basin in Citanduy landslide prone areas are showing behaviors that can be read via relationship of Suspended Load with discharge. Six rivers studied show different conditions in accordance with the conditions of landslide prone areas around it, also with the condition of each rock. Avalanche region is restricted to several zones of slope stability.Turbidity of the river with small to large are, respectively are S. Cilongkeang, S. Cibarengkok, S. Cilemahurug, S. Cikawung, S. Cinyirib, and S. Cidawolong.River with Sub-watershed wich the most eroded until the lightest on the upstream and the surrounding, respectively are S. Cilongkeang, S. Cilemahurug, S. Cibarengkok, S. Cikawung, S. Cidawolong, and S. Cinyirib.Based on statistical analysis with T-test, S. Cidawolong and S. Cinyirib were not significantly different. In exponential graphics, S. Cilongkeang & S. Cilemahurug, and S. Cibarengkok & S.Cikawung, visually show the same character, but on a statistical analysis with T-test are concluded that significantly different with  = 5%.

GEOMETRI AKUIFER BERDASARKAN DATA GEOLISTRIK DAN SUMUR PEMBORAN DI DAERAH JASINGA, KECAMATAN JASINGA, KABUPATEN BOGOR, JAWA BARAT Mohammad, Febriwan; Mardiana, Undang; Yuniardi, Yuyun; Alfadli, Muhammad Kurniawan
Bulletin of Scientific Contribution Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

SARI Daerah penelitian secara geografis terletak pada 106° 26’ 45” BT sampai 106° 29’ 15” BT dan -6° 26’ 00” LS sampai -6° 28’ 30” LS. Secara administratif daerah penelitian berada di Desa Cikopomayak dan sekitarnya, Kecamatan Jasinga, Kabupaten Bogor, Provinsi Jawa Barat. Daerah penelitian terbagi menjadi 2 satuan batuan yaitu Satuan Batulanau dan Intrusi Andesit. Pengukuran geolistrik dan sumur pemboran digunakan untuk mengetahui kondisi geologi bawah permukaan secara vertikal maupun lateral. Daerah penelitian memiliki tiga kelompok nilai resistivitas dan litologi, yaitu batuan dengan nilai resistivitas rendah (0 – 60 Ω.m) dengan litologi batulempung – serpih dan batulanau, resistivitas menengah (61 – 130 Ω.m) dengan litologi batulempung pasiran, batupasir sedang, dan batupasir kasar, dan resistivitas tinggi (131 – 180 Ω.m) dengan litologi batupasir halus, batulempung pasiran, dan andesit. Keberadaan lapisan akuifer dibuktikan dengan adanya lapisan batupasir sedang – batupasir kasar pada kedalaman 10 dan kedalaman 20 meter dari sumur pemboran. Dari korelasi data geolistrik dan sumur pemboran, dibuat penampang sistem akuifer yang melewati daerah penelitian yang selanjutnya di modelkan ke dalam diagram pagar geometri akuifer. Berdasarkan model geometri akuifer, daerah penelitian terbagi menjadi tiga jenis akuifer yaitu, akuifer bebas, akuifer semi tertekan, dan akuifer tertekan.Kata Kunci : geolistrik, sumur pemboran, geometri akuifer. ABSTRACTThe research area is geographically located at 106° 26’ 45” East up to 106° 29’ 15” East and 6° 26’ 00” South up to 6° 28’ 30” South. Administratively, area of research is in the Cikopomayak, Jasinga, Bogor District, West Java Province. The research area is divided into two rock units, Siltstone Unit and Andesite Intrusion. Georesistivity method and well drilling used to study subsurface geology. The research area have three kind of resistivity and lithology value, that is low resistivity (0 – 60 Ω.m) with shale and siltstone lithology, medium resistivity (61 – 130 Ω.m) with sandy clay and sandstone lithology, and high resistivity (131 – 180 Ω.m) with sandstone, sandy clay, and andesit lithology. Presence of aquifer layer proved by sandstone in well drilling at depth of 10 – 20 meters. From the georesistivity and well drilling data correlation, made a cross section of aquifer system in the research area, then modelled to fence diagram. According to geometric model of aquifer, the research area divided to three aquifer configurations, unconfined aquifer, semi confined aquifer, and confined aquifer.Keyword : resistivity, geometry aquifer

A FEW OF TURBIDITE CHARACTERISTIC FEATURE IN THE VICINITY OF BANTARUJEG -, Abdurrokhim
Bulletin of Scientific Contribution Vol 5, No 1 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The traversing of Cilutung River exposes the sedimentary rock which is corresponding to turbidity system sedimentation. In around Bantarujeg area, the composite lithology is characterized by monotonous of poorly sorted tuffaceous sandstone interbedded with mudstone of classical turbidite; coarse grain of pebbly sandstone; interbedded tuffaceous sandstone and mudstone of slump deposits; disorganized pebble-coble-sized components of mud supported; massive sandstone and polymix breccia. A genetic unit based on sedimentary processes is more reliable in order to grouping the lithostratigraphic units.

KERAPATAN KELURUSAN SUNGAI DI WILAYAH MAJALENGKA DAN HUBUNGANNYA DENGAN VARIABEL MEKANIKA TANAH: SUDUT GESER-DALAM Zakaria, Zufialdi; Sophian, Irvan
Bulletin of Scientific Contribution Vol 13, No 2 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Areas of the research include the role in The Eastern Zone of Bogor Basin. In this research are Research areas included in the Eastern zone Bogor Basin. In this research are discussed: 1) The role of tectonic and drainage lineament on Tertiary and Quaternary rocks in the study area; 2) The role of soil variables that are part of the parent rock material. The method used is a probabilistic analysis involving friction angle and lineament densty. The results showed: 1) The absence of differences in the direction of linemament drainage patterns on Tertiary and Quaternary rocks, indicating the influence of the deformation of the same, namely the upligt, the two rocks together to experience the rapture; 2) The density llinemanet associated with one variable, namely internal friction angle (phi). Internal friction angle (phi) decreases with increasing density lineament.

PENDEKATAN KUANTITATIF DALAM PENENTUAN ASOSIASI FASIES LAUT DALAM FORMASI HALANG PADA SUNGAI KALIGINTUNG, JAWA TENGAH SUBAGJA, MUHAMAD AGAM; Setiadi, Djadjang Jedi; Jurnaliah, Lia; Syafri, Ildrem; Alam, Syaiful; Elfitra, Dhanu
Bulletin of Scientific Contribution Vol 17, No 3 (2019): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Penggunaan metode kuantitatif cukup berkembang pada tahun 1950an dalam bidang sedimentologi dan stratigrafi terutama dalam membantu menjelaskan asosiasi fasies, proses pembentukannya dan lingkungan pengendapan. Lokasi penelitian berada koordinat 07° 30' 00,0" – 07° 30’ 30.0” LS dan 109° 27' 30,0" – 109° 28’ 10,0” BT yang secara administratif berada pada Provinsi Jawa Tengah. Daerah penelitian termasuk ke dalam Formasi Halang. Tujuan dari penelitian ini adalah untuk mengetahui model asosiasi fasies lokal yang terbentuk pada daerah penelitian. Pengambilan data dilakukan dengan metode penampang stratigrafi terukur pada sebagian lintasan Sungai Kaligintung sedangkan pengolahan data dibantu oleh metode kuantitatif berupa analisis Markov Chain dan Binomial Probability untuk mengetahui hubungan antar fasies. Pada daerah penelitian terdapat 13 litofasies yaitu Diorganized gravels (A1.1), Normally-graded Pebbly Sand (A2.7), Thick-bedded disorganized sand (B1.1), Thin-bedded coarse-grained sand (B1.2), Parallel-stratified sand (B2.1), Thick-bedded sand-mud couplet (C2.1), Medium-bedded sand-mud couplet (C2.2), Thin-bedded sand-mud couplet (C2.3), Mud-dominated sand-mud couplet (C2.4), Mottled muddy sand (C1.2), Structureless silt (D1.1), Structureless mud (E1.1) dan Contorted strata (F2.1). Adapun asosiasi fasies pada daerah penelitian terdiri atas Channel fill deposit, Levee deposit, Lobe deposit dan Interchannel deposit. Kata kunci : Binomial Probability, Formasi Halang, Litofasies, Markov Chain.

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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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