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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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TEKTONIK SESAR CIMANDIRI, PROVINSI JAWA BARAT Haryanto, Iyan; Hutabarat, Johanes; Sudrajat, Adjat; Ilmi, Nisa Nurul; Sunardi, Edy
Bulletin of Scientific Contribution Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRACTCimandiri fault formed during stage II orogenesis is the oldest fault at the end of the middle Eocene. The Cimandiri fault is the active fault that developed a paleo high and uplifted the Ciletuh Formation within front arc basin. The stage III orogenesis at the Late Eocene indicated by regional compression in the Java that affected to reactivation fault. This fault known to be the same as the Baribis thrust fault. Finally, the compression tectonic decreased that it created the normal fault on Cimandiri thrust-fold. Therefore, we can define the Cimandiri fault into two regional fault patterns. The first pattern, the thrust fault that indicated by high bedding inclined. The second pattern, the next pattern is the normal fault that revealed by fault scarps inclination more than 50o or even vertical in some locations. Keywords: Cimandiri fault, front arc basin, Ciletuh valley, Cimandiri Valley. ABSTRACKSesar Cimandiri merupakan sesar tua yang terbentuk selama berlangsungnya orogenesa tahap II, yaitu pada waktu Akhir Eosen Tengah. Pada saat itu batuan sedimen Formasi Ciletuh berumur Eosen Tengah yang terbentuk di dalam Cekungan Depan Busur sudah terangkat ke permukaan. Sesar ini terus aktif hingga menyebabkan terbentuknya tinggian purba (paleo-hight) antara Lembah Ciletuh dan Lembah Cimandiri. Pada Akhir Tersier, tektonik kompresi kembali terjadi, menyebabkan untuk ketiga kalinya sesar Cimandiri teraktifkan kembali sebagai sesar naik. Peristiwa ini disimpulkan sebagai orogenesa ke III di Pulau Jawa. Salah satu struktur sesar regional yang terbentuk pada saat itu adalah Sesar Baribis. Setelah tektonik kompresi berkurang terjadi kesetimbangan menyebabkan terbentuknya sesar normal pada jalur lipatan anjakan Cimandiri. Oleh karena itu, Sesar Cimandiri terdiri atas dua sesar regional yang pertama sebagai sesar naik yang dicirikan oleh deformasi lipatan batuannya yang umumnya tegak, dan sebagai sesar normal yang dicirikan dengan terbentuknya gawir sesar dengan kemiringan di atas 50° bahkan di beberapa lokasi mendekati vertical. Kata Kunci: Sesar Cimandiri, Cekungan Depan Busur, Lembah Ciletuh, Lembah Cimandiri.

PENGELOLAAN AIRTANAH YANG BERWAWASAN LINGKUNGAN OLEH INDUSTRI AIR MINUM DALAM KEMASAN (AMDK) -, T. Yan W. M. Iskandarsyah; -, Hendarmawan
Bulletin of Scientific Contribution Vol 8, No 1 (2010): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v8i1.8242

Sustainability of production of bottled drinking water is highly dependent and influenced by the condition of the recharge zone. Thus, knowledge and understanding of local conditions and the behavior of groundwater recharge to the springs is required. To get a decent source of water produced and minimize the impact can inflict negative, then P.T. Tirta Investama implemented several stages such as literature study, identifying the area, a preliminary survey, detail survey, EIA studies, the production (construction and installation), and recharge area study at least one year. Protection of water resources taken from the aquifer is not used by people around in general (aquifers) as well as against the source of water which is generally utilized by the population (unconfined aquifer) translated in the construction of a well borehole. Meanwhile, study catchment areas become the crucial factor in the management of groundwater, natural feedback input is one of the factors associated with the process of infiltration.From this study obtained distribution of the origin of groundwater (recharge) to the water that comes out (discharge) and the layers that tend vulnerable to groundwater contamination. Studies recharge area for a minimum of one year is a very important study as sustainable groundwater resource management efforts in order water balance in a region.

Sikuen Stratigrafi Formasi Talang Akar Lapangan “Dr”, Sub–Cekungan Jambi,Cekungan Sumatera Selatan Firmansyah, Yusi; Riaviandhi, Dhehave; Gani, Reza Muhammad Ganjar
Bulletin of Scientific Contribution Vol 14, No 3 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The area of this study include to PT. Energi Mega Persada Tbk work area. The area of this study is located in Jambi Sub - Basin, South Sumatera Basin. This study is emphasized to examine the sequence stratigraphy of Talang Akar Formation. The data that is used in this study include core, mudlog, 3D seismic, well log, and palynomorf fossil. The result of those data analysis and data correlation are lithofacies, electrofacies, depositional environment, and stratigrahys sequences of Talang Akar Formation. From data analysis, the facies’ that develop in Talang Akar Formation are A, B, C, D, E, F, G, H, I, J, K, L, and M. Those facies’are deposited in fluvial – deltaicenvironment at Late Oligocene until Early Miocene. From the well correlation and seismic interpretation, the sediment distribution pattern of Talang Akar Formation become thicker and deeper in the west side and the highland is located relatively in the east of the study area. At the area of study Talang Akar formation is very influenced by structure. From the lithofacies and electrofacies analysis, there are six kinds of stratigraphy sequencesthat develop in the study area. System tracts LST-1 (braided channel) just developed at sequence-1. The other sequences developed TST 1 – 4 (floodplain meandering channel), TST 5 – 6 (marsh delta plain), HST 1 – 4 (crevasse splay meandering channel) and HST 5 – 6 (floodplain delta plain). . Keywordsi: Sequence stratigraphy, facies,depositional environment, Talang Akar Formation, Jambi Sub - Basin. Daerah penelitian termasuk ke dalam wilayah kerja PT. Energi Mega Persada Tbk. Daerah penelitian berada di Sub – Cekungan Jambi, Cekungan Sumatera Selatan. Studi ini difokuskan untuk membahas sikuen stratigrafi Formasi Talang Akar. Dalam penelitian ini, data yang digunakan adalah core, mudlog, seismik 3 dimensi, well log, dan fosil palinomorf. Hasil dari analisis dan korelasi data tersebut adalah litofasies, elektrofasies, sikuen stratigrafi, dan lingkungan pengendapan dari Formasi Talang Akar. Dari analisis data tersebut didapatkan bahwa fasies yang berkembang pada Formasi Talang Akar adalah fasies A, B, C, D, E, F, G, H, I, J, K, L, dan M. Fasies tersebut diendapkan di lingkungan fluvial – deltaic pada umur Oligosen Akhir sampai Miosen Awal. Berdasarkan korelasi antar sumur dan interpretasi seismik, distribusi sedimen Formasi Talang Akar lebih menebal dan mendalam pada sisi barat dengan tinggian yang berada relatif pada bagian timur daerah penelitian. Pada daerah penelitian Formasi Talang Akar sangat dipengaruhi oleh struktur serta berdasarkan analisis litofasies dan elektrofasies terdapat 6 sikuen yang berkembang pada daerah penelitian. System tracts LST-1 (braided channel) hanya berkembang pada sikuen-1. Pada sikuen lainnya berkembang TST 1 – 4 (floodplain meandering channel), TST 5 – 6 (marsh delta plain), HST 1 – 4 (crevasse splay meandering channel) dan HST 5 – 6 (floodplain delta plain). Kata kunci : Sequence stratigraphy, facies, depositional environment, FormasiTalang Akar, Sub Cekungan Jambi.

GEOLOGI DAN POTENSI BAHAN GALIAN BIJIH BESI DAERAH ACEH BARAT DAYA -, Iyan Haryanto
Bulletin of Scientific Contribution Vol 5, No 3 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The geology of the Aceh Baratdaya has been controlled by convergence of the Eurasian and Indian lithospheric plates since the Mesozoic era. Various types of rock—including the metamorphic, meta-sedimentary, volcanic, and plutonic rocks—and the associated economic mineral deposits have been formed by diverse geologic proceses (i.e., sedimentation, lithification, metamorphosis, crystallization, and structural processes) associated with convergent plate interactions.The magnetic iron ores in the study area are interpreted as the crystallization product of hydrothermal solutions. Genetically, the iron ore in the study area is of lateritic type. Most of the ores in the study area are spread in northwest-southeast direction, in harmony with the general trend of faults and folds.

PETROLOGI BATUAN OFIOLIT DAERAH SODONGPARAT, KAWASAN CILETUH, SUKABUMI Rosana, Mega F.; Yuningsih, Euis T.; Saragih, Kessar D.; Ikhram, Rinaldi; Ardiansyah, Nugraha
Bulletin of Scientific Contribution Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Ophiolite outcrops offers a unique opportunity to learn directly oceanic lithosphere, as ophiolite represents one of the few outcrops of rock that body can not be reached. Ophiolite is interpreted in the context of plate tectonics, as part of the oceanic lithosphere thrust into the continent during the first phase of orogenesa. Many geologists believe that the definition of ophiolite according to Penrose Field Conference in 1972, which is a typical sequence of rocks composed of, starting from the bottom: the complex ultramafic, gabbro complex, complex sheeted mafic dikes, complex mafic-volcanic and sedimentary pelagos. Ophiolite sequence may be incomplete, torn or termetamorfisme. Group ophiolite in area Ciletuh is an assemblage of mafic rocks (basalt, gabbro and ultramafic (peridotite, serpentinite), which is closely associated with the sedimentary-volcanic and metamorphic rocks. Generally ofiolitnya a sequence ophiolite very incomplete, and the mechanism of the transferor-tempatannya (emplacement ) can be equated with ophiolite "Cordilleran", which is rather a ophiolite (ocean floor, which did not contain fragments of the continent) above the subduction complex.

INTERPRETASI GEOKIMIA UNSUR UTAMA DAN JEJAK KOMPLEKS VOLKANIK GUNUNG PONGKOR KABUPATEN BOGOR, JAWA BARAT -, Johanes Hutabarat
Bulletin of Scientific Contribution Vol 4, No 1 (2006): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The research about study on geochemistry igneous rocks of Gunung Pongkor, Bogor, West Java. Basuki, et al., (1994) summarized the geology of the Pongkor areas consists of pyroclastic rocks (breccias and tuff) and lava flows and domes. Some problem to identifications which can in this research shall be as follows : How chemical composition and rocks afinity and also its evolution of exist in Mount Pongkor area have typical marking?.Samples of the Gunung Pongkor were extensively analyzed for major oxides and trace elements. Compositions of geochemical samples have been plotted and are used in drawing petrogenetic inferences. Igneous rocks Gunung Pongkor belong to the medium calc-alkalic to high Calc-alkalice suites (Peccerillo and Taylor; 1976), and have SiO2 contents in the range of 61,34-68,55%, middle and TiO2 and Al2O3 successively high (14,99-19,63%) and lower (< 0,50%); while K2O range from 1,90-2,55%. Other characteristic is the existence of some example of more enriched in Rb content and Ba. This Enrichment is also expressed by K2O content which relative higher. Than Ni element content and low Cr, and also Mg number ([Mg#]) less than 65, designate that its rock is not primitive, or equally experience of larger ones crystal fraksinasi from its mains magma.

PENGARUH SESAR CIMANDIRI TERHADAP MORFOLOGI DAERAH PADALARANG Haryanto, Iyan; Sunardi, Edy
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 | DOI: 10.24198/bsc.v12i2.8367

Cimandiri Fault is a regional fault that stretching from Pelabuhanratu (Sukabumi) to end up in the complex area of Mt. Tangkubanprahu – Mt. Burangrang (Subang - Northward of Bandung). Regional fault has been widely studied, but there are differences of opinion, especially regarding the type of shift.This study aimed to examine all aspects relating to Cimandiri Fault, especially along the segment Tagokapu-Cibogo (Padalarang-Citatah), so that can be known about the type of the fault. Steps and methods of research, among others, to analyze the landscape through satelite image, make observations, descriptions and measurement of geological structure elements, data processing by program using "dip" and "Paleostress" softwares. Cimandiri fault lines along the segment Tagokapu-Cibogo, can be recognized from various aspects, among others, from the aspect of geomorphology characterized by differences in the shape and elevation of the hills; from stratigraphical aspects there are contact between rock formations of different ages; from fold structure aspects there are found standing upright rock layers; and from the aspect of fault outcrop, there were indications that the fault is generally associated with horizontal fault. From the results of the analysis showed that the lineament of Cimandiri Fault along Tagokapu-Cibogo segment, controlled by a reverse fault and normal faults that formed in different tectonic period.

Stratigrafi Vulkanik Sub DAS Cibadak Implikasinya terhadap Kegiatan Gunungapi Salak Lereng Timur MUTAQIN, DEDEN ZAENUDIN; Mardiana, Undang; Mohammad, Febriwan; Alfadli, Muhammad Kurniawan; Natasia, Nanda
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 | DOI: 10.24198/bsc.v17i1.20904

Penelitian Stratigrafi rinci mengenai daerah vulkanik masih jarang dilakukan. Hal ini biasanya dikarenakan oleh kondisi lapangan yang sulit ditempuh. Akan tetapi, penelitian fasies vulkanik ditujukan untuk mengetahui perkembangan gunungapi secara geologi baik dari segi kebencanaan atau potensi. Penelitian ini berlokasi di Sub DAS Cibadak Lereng Timur Gunung Salak untuk mengetahui perubahan litologi baik secara lateral maupun vertikal. Permasalahan dipecahan dengan Observasi lapangan dan karakteristik permukaan. Data lapangan berupa lintasan-lintasan stratigrafi berdasarkan daerah sub DAS Cibadak yang terdiri dari sungai cibadak, cikuda, cipanengah dan cimenteng. Berdasarkan fasies vulknik dari keseluruhan analisis , terdapat 6 kelompok fasies dari muda ke tua yaitu Block and ash flow deposit 2 salak, lava flow 2 salak, block and ash flow deposit 1 salak, lava flow 1 salak, pumice flow deposit salak dan scoria flow deposit pra salak.

KARAKTERISTIK SEDIMEN DAN MIKROORGANISMA PERMUKAAN DASAR LAUT PERAIRAN MADURA BAGIAN UTARA -, Vijaya Isnaniawardhani
Bulletin of Scientific Contribution Vol 10, No 1 (2012): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Characteristics of the river basin in Citanduy landslide prone areas are showing behaviors that canThe study was conducted to investigate the characteristics of the sediment, particularly sediment texture, and the amount and spread of microorganisms (nannoplankton and foraminifera) at the seafloor surface sediments of the northern waters of Madura. Karaktersistik sediment analysis is intended to determine the sediment texture, as for the analysis of microorganisms to determine the abundance, genus and species or the dominant characteristic in this area and its relation to bathymetric position on the line pantai.Analisis dab dilakukanterhadap laboratory 15sampel seabed surface waters of the North Madura, with a depth range between 5-77 m. Based on sediment texture can be seen that the sediment is composed of clay, silt and clay lanauan pasiran, which generally contains shell fragments microorganisms. On the seafloor surface sediments can be determined 20 species of nannoplankton and planktonic foraminifera and 30spesies 16spesies Benton foraminifera, with an abundance of being. Abundance and diversity increased with increasing depth nannoplanktoncenderung and proximity to the shoreline. Abundance and keanekaragamanterendah around the northern coastline of the island of Java and Madura Strait. This is probably due to the influence of antripogenik in this area. Species that were found relatively evenly and always appear in each sample was Emiliania huxleyi and Gephyrocapsa Oceanica. Gephyrocapsa is found predominantly in samples around the shoreline. Planktonic foraminifera abundance and diversity tends to increase with increasing depth and distance to the shoreline. Globigerinoides ruber is very common. Benton foraminifera dominated by Rotalina. The common genus is Ammonia, Quinqueloculina, Spiroloculina, Triloculina, Asterorotalia, Cibicides, Cancris, Elphidium, and Textularia Pseudorotalia, which tend to be more abundant at sites located in the north (away from the beach). Cibicides showed maximum abundance in the relatively distant from the coastline. Ratio of the total abundance of foraminifera plankton foraminifera tend to increase with increasing distance to the shoreline and depth.

KARAKTERISTIK MORFOMETRI DAN MORFOTEKTONIK DAS CIBEET SEGMEN SELAAWI GIRIJAYA DAN DAS CIKUNDUL SEGMEN CIBADAK MAJALAYA, KABUPATEN CIANJUR, PROVINSI JAWA BARAT Anfasha, Arifin; Pranantya, Pulung Arya; Sukiyah, Emi
Bulletin of Scientific Contribution Vol 14, No 2 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

West Java is an area that has a high vulnerability to disasters, the condition is influenced by a complex geological structure so prone to geological disasters, and faults can be studied by morphotectonic study approach. With morphometric analysis were used to identify the character of the shape of a region and its relation to the level of tectonic activity. Comparison of morphotectonic aspects of the Quaternary and Tertiary age rocks will involve active tectonic processes in it. Research carried out by three methods, namely studio methods with data measuring of straightness of the ridge and valleys, Rb, Dd, and Smf, field methods by means of geological mapping data retrieval strike / dip, fractures, megascopic descriptions of rock, image capture of the field, laboratory methods by analyzing fracture data and verification of field data with the data link between the studio and the activeness of faults in the study area. The activeness of fault and other geomorphological parameters can be determined by a variety of morphotectonic approaches, morphotectonic parameters such as Rb, Dd, Smf and straightness of ridge and valleys has become a reference in determining the activeness. The geological structure in the area of research are in form of faults and fractures, which relatively trending northwest - southeast. Fault is evidenced by their straightness of DEM image as well as fracture data found in the field. Keyword : Morphometry, Morphotectonic, Watershed, Active tectonic, DEM Jawa Barat merupakan salah satu wilayah yang memiliki kerawanan bencana tinggi, kondisi ini dipengaruhi oleh tatanan geologi yang kompleks sehingga rawan dengan bencana geologi, sesar dapat diketahui dengan pendekatan studi morfotektonik. Dengan cara analisis morfometri digunakan untuk mengidentifikasi karakter bentuk suatu wilayah dan kaitannya dengan tingkat aktivitas tektonik. Perbandingan aspek-aspek morfotektonik pada batuan berumur Kuarter dan Tersier akan melibatkan proses tektonik aktif di dalamnya. Penelitian dilakukan dengan tiga metode yaitu metode studio dengan pengukuran data kelurusan punggungan, lembahan, Rb, Dd dan Smf, metode lapangan dengan cara pemetaan geologi pengambilan data strike/dip,kekar,deskripsi batuan secara megaskopis, pengambilan foto lapangan, metode laboratorium dengan menganalisi data kekar dan mengintervetasi pembuktian data lapangan dengan data studio dan adanya keterkaitan antara keaktifan sesar di wilayah penelitian. Keaktifan sesar dan parameter geomorfologi dapat diketahui dengan berbagai pendekatan morfotektonik, Parameter morfotektonik seperti Rb, Dd, Smf dan Kelurusan tersebut menjadi acuan dalam menentukan keaktifan. Struktur geologi di daerah penelitian berupa kekar dan sesar yang berarah relatif barat laut – tenggara. Sesar tersebut dibuktikan oleh adanya kelurusan dari citra DEM serta data kekar yang ditemukan dilapangan.Kata kunci : Morfometri, Morfotektonik, DAS, Tektonik aktif, DEM

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Muhammad Kurniawan Alfadli

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m.kurniawan@unpad.ac.id

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