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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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KEMENERUSAN VEIN KUBANG CICAU DI BAWAH LEVEL 500 BERDASARKAN ANALISIS KEKAR -, Ismawan T.
Bulletin of Scientific Contribution Vol 4, No 1 (2006): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Pongkor area is known as one of the gold mine in Java. With the reserve at present and decreasing each year a new gold reserve must be discovered.Study on structures, especially fractures on Kubang Cicau vein is conducted to discover a possiblity of Kubang Civau vein continuity below level 500.Fractures analyses along the Kubang Cicau veins shows that there are development of intens fracture arround the main vein. Based on structural evaluation result it is recommended that areas between MW1 and MW2, around MW5 and on the south of MW7 can obtain a vein with a sufficient thickness at the level 450.

KARAKTERISTIK BATUAN METAMORF BAYAH di DESA CIGABER, KABUPATEN LEBAK, PROVINSI BANTEN Patonah, Aton; Syafri, Ildrem
Bulletin of Scientific Contribution Vol 12, No 2 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Metamorphic rocks in Bayah Complex included by Bayah mountain zone. Purpose of this research is to know characteristic of this rock with using petrography methods, that is, identify texture, structure, mineral contain, and metamorphic facies of the rocks. The result showed that kind of the rock is dominated by biotite schist, some actinolite schist, hornblend schist and chlorite schist. Almost all them have retrograde metamorphism, is characterized by biotite altered to chlorite and muscovite, hornblende to actinolite, and actinolite to chlorite. This proses probably associated by uplift processes in Eocene – Oligocene.

Regresi Non-Linear pada Pemodelan Dekompaksi Alam, Syaiful; Nurdradjat, .; Muljana, Budi; Setiadi, Djadjang Jedi
Bulletin of Scientific Contribution Vol 17, No 1 (2019): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

AbstractDecompaction modeling is critical step in geohistory analysis. Decompaction modeling aims to obtain the thickness of stratigraphic unit before being compacted. Formulation of decompaction modeling requires initial porosity ( ) and coefficient of compaction (c). These two parameters are disentangled by porosity-depth relationship. Exponential model is used as the basis for knowing the relationship. Historically, exponential model often describes a more realistic porosity-depth phenomenon than other models. The exponential model yield the absence of negative porosity as the depth increases. The parameter and c from a number of data are solved through regression method. This paper presents statistical explanation on non-linear regression to generate a simpler formulation, thus facilitating the calculation of initial porosity and coefficient of compaction. These parameters are used later in decompaction modeling. Keywords: Decompaction modeling, non-linear regression, initial porosity, coefficient of compaction. AbstrakPemodelan dekompaksi adalah bagian yang penting dalam analisis geosejarah. Pemodelan dekompaksi bertujuan untuk mendapatkan ketebalan unit stratigrafi sebelum mengalami kompaksi. Formulasi pemodelan dekompaksi memerlukan parameter porositas awal ( ) dan koefisien kompaksi (c). Kedua parameter tersebut dapat ditentukan dari model porositas-kedalaman yang digunakan. Model eksponensial dijadikan sebagai landasan untuk mengetahui hubungan tersebut. Secara historis, model eksponensial seringkali menyajikan fenomena porositas-kedalaman yang lebih realistis dibandingkan dengan model lain. Model eksponensial memungkinkan tidak adanya nilai porositas yang negatif seiring dengan bertambahnya kedalaman. Parameter dan c dari sejumlah data tersebut dapat dicari melalui metode regresi. Paper ini menyajikan pemaparan proses statistik regresi non-linear sehingga menghasilkan formulasi yang lebih sederhana. Formulasi ini memudahkan perhitungan penentuan parameter dan c. Parameter tersebut digunakan nantinya dalam pemodelan dekompaksi. Kata kunci: Pemodelan dekompaksi, regresi non-linear, porositas awal, koefisien kompaksi.

KRONOSTRATIGRAFI CEKUNGAN KUTAI BAGIAN BAWAH, DAERAH BALIKPAPAN DAN SEKITARNYA, PROPINSI KALIMANTAN TIMUR -, Yuyun Yuniardi; -, Budi Muljana; -, Rahmat Fakhrudin
Bulletin of Scientific Contribution Vol 10, No 1 (2012): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Chronostratigraphy in lower Kutai Basin is very interesting to do research, in this area borders of chronostratigraphy need Paleontology Zone data and global tectonic. Chronostratigraphy in lower Kutai Basin divided into four part : Interval N2-N3, N4-N8, N9-N13, and N14-N21.

GEOKIMIA BATUAN VOLKANIK FORMASI CIKOTOK DI SEGMEN UTARA KUBAH BAYAH, BANTEN Hutabarat, Johanes
Bulletin of Scientific Contribution Vol 14, No 2 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The Bayah Dome area compiled by various rock formations either volcanic rock and also sediment, where the volcanic rock is in general is main compiler from Cikotok and Cimapag Formation which age Tersier. Volcanic rock in Bayah Dome is distinguishable to become two main lithology types that are coherent- and non-coherent volcanic roks. Coherent volcanic roks in Bayah dome northern segmentconsist of basalt-, and andesitelava. Andesitic lava is dominant rock. Both types of the lithology in general has experienced hydrothermal alteration distinguished with there is of secondary mineral like chlorite, sericite, carbonate, clay and opaq minerals. The mineralogical and rock geochemistry composition, the volcanic rock has been formed in island arc environment characterized by content SiO2 is ranging from 48.29%-58.34%, Al2O3 between 12.49%-17.18%; TiO2 and P2O5 ranges from 0.49%-0.81%, and 0.20%-0.41% respectively. Keywords: Andesite, Basalt, Hydrothermal alteration, Volkanic Calk-alkaline, Island arc.Daerah Kubah Bayah disusun oleh berbagai formasi batuan baik batuan volkanik maupun sedimen, dimana batuan volkaniknya pada umumnya merupakan penyusun utama dari Formasi Cikotok dan Cimapag yang berumur Tersier. Batuan volkanik di Kubah Bayah dapat di bedakan menjadi dua jenis litologi yang utama yaitu batuan volkanik koheren dan batuan volkanik non-koheren. Batuan volkanik koheren di segemen utara Kubah Bayah terdiri dari lava basalt, dan andesit. Andesitik merupakan batuan yang dominan. Kedua jenis litologi tersebut pada umumnya telah mengalami ubahan hidrotermal yang dicirikan dengan terdapatnya mineral sekunder seperti klorit, serisit, karbonat, mineral lempung, dan mineral opak. Secara komposisi mineralogi dan geokimia batuan, batuan volkanik tersebut terbentuk di lingkungan busur kepulauan yang ditandai oleh kandungan kandungan SiO2 yang berkisar antara 48.29%-58.34%, Al2O3 antara 12.49%-17.18%; TiO2 dan P2O5 berturutan berkisar antara 0.49%-0.81%, dan 0.20%-0.41%. Kata Kunci: Andesit, Basalt, Alterasi hidrotermal, Volkanik Kalk-alkali, Busur Kepulauan.

ANALISIS KEKAR PADA BATUAN SEDIMEN KLASTIKA FORMASI CINAMBO DI SUNGAI CINAMBO SUMEDANG JAWA BARAT -, Faisal Helmi
Bulletin of Scientific Contribution Vol 5, No 2 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Tektonik Plio-plistosen menyebabkan terbentuknya pola lipatan dan pensesaran di daerah Sumedang. Salah satu struktur sesar yang berkembang di daerah ini adalah sesar Cinambo. Dari penafsiran peta topografi nampak adanya suatu kelurusan sungai Cinambo yang berarah utara timur laut-selatan baratdaya. Berdasarkan hasil analisis kekar gerus yang dijumpai di sepanjang Sungai Cinambo ini, diketahui ada beberapa sistem tegasan, namun demikian secara keseluruhan sistem tegasan pembentuk sesar ini seluruhnya menunjukan sifat kompresional dengan arah tegasan utama relatif utara-selatan. Sistem tegasan kompresional ini menunjukan gerak lateral yang ditunjukan oleh posisi tegasan menengah yang vertikal. Dengan demikian dapat disimpulkan bahwa sesar Cinambo merupakan sesar mendatar sinistral

PENTINGNYA IDENTIFIKASI PATAHAN AKTIF DALAM UPAYA MITIGASI BENCANA DI KAWASAN PENDIDIKAN JATINANGOR, JAWA BARAT Muslim, Dicky; Endyana, Cipta
Bulletin of Scientific Contribution Vol 13, No 2 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

West Java region is tectonically active area because it is close to the subduction zone between the Eurasian continental plate with the Indo-Australian oceanic plate. This led to the high intensity of the presence of active faults, either already identified or not. Jatinangor areas as education city is now growing very rapidly filled by a variety of campus facilities. There are four major colleges (UNPAD, ITB, IKOPIN, STPDN) and various supporting infrastructure. With the increasing number of population and limited land can be built, the various geological resources in this area should be managed as well as possible, including land resources as part of the various geological resource potential that can be developed to meet the needs and desires of humans. The existence of various lineament of morphology around the area Jatinangor considered as a continuation of the path which uncategorized Lembang Fault is active. A number of earthquake ever recorded in the past has the epicenter around this fault. This study aims to explain the importance of the identification of active faults in disaster mitigation efforts on the limited land resources but must meet the needs of the growing population. The results showed that there are a number of alignment around G. Manglayang that can be associated with kemenrusan Lembang Fault. At the southern foot of Mt. Manglayang spread a general lineament trending north-south and northwest-southeast which is straightness lembahan and hills. In geomorphological generally show the characteristics of active faults that are vulnerable to earthquake activity. This will limit the different characteristics of land that can be built because it must take into account the values of dynamic bearing capacity as the earthquake disaster mitigation efforts in the future. In addition, it is also necessary mitigation efforts related to disaster education to all stakeholders in the area of research.

KENDALI GEOLOGI TERHADAP POLA ALIRAN AIRTANAH BEBAS DAN TERKEKANG DALAM EVALUASI POTENSI AKIFER, STUDI KASUS DAERAH PANDAAN DAN SEKITARNYA, KABUPATEN PASURUAN, JAWA TIMUR Reza, Teuku; Hendarmawan, .; Alam, Boy Yoseph Cahya Sunan Sakti Syah
Bulletin of Scientific Contribution Vol 18, No 1 (2020): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Geological control has been examined on the pattern of groundwater flow from free and confined aquifer in the evaluation of aquifer potency in case study in the Pandaan and surrounding areas, Pasuruan Regency, East Java. Groundwater elevation (MAT) measurement data of dug wells, borehole pumping tests, 1D geoelectricity, and wellbore log results indicate that groundwater flow patterns from free and confined aquifers have the same flow direction from southwest to northeast indicating that the distribution hydrogeological units of both aquifers are relatively homogeneous. The depths of the free aquifer from 1 to 6 meters with sand and tuffaceous sand lithology. Confined aquifer from a depth of 40 meters with a thickness between 20 to 70 meters. The aquifer unit is a tuff breccias rock from the Mt. Arjuna Welirang and Tuf Rabano Formation, aquiclude units in the form of andesite lava from Mt. Arjuna Welirang. Potential confined aquifer evaluated from pumping test has a transmissivity value between 54 - 315 m2 / day. Hydraulic conductivity (k) values are between 1.46 - 12.4 m / day. Keywords: Hydrogeological unit, transmissivity, hydraulic conductivity, aquifer, aquiclude

PENENTUAN TIPOLOGI AKIFER BERDASARKAN METODA GEOLISTRIK DAN HIDROKIMIA, KOTA TANGERANG Dwi Hadian, M. Sapari
Bulletin of Scientific Contribution Vol 3, No 2 (2005): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Electrical sounding expectation is used to estimate the early model from a groundwater system in thefield, which can be used as a comparison of field results. The comparison enhances to entrust the processof field activities and provide the opportunity to modify the programs in the field and to ensure that we haveenough information received efficiently - in a point of view of geological framework. A Usefulness of amapping hydrogeology is to show the under surface geometry (structure) and the hydraulic property fromearth materials which is used to investigate the hydrodynamic property appeared from the undergroundwater on natural shares ( Basin) or a part of its filler.The exploration using the method of the electrical sounding is conducted on land surface by injecting adirectional current (DC) with a low frequency into a deeper ground passing through two current electrodes.A different potential capacity is measured on the surface by two potential electrodes. The result of themeasurement capacity which is injected and the potential difference occurred in every different electrodedistance will give a value variation of a typical resistance. The value variation shows the existence of anunderground rock coat variation, while the method of hydrochemistry explains the genesis of thegroundwater based on a physical characteristic and chemistry substances on the field.Both methods are expected to reconstruct the aquifer condition and its system through surface andunderground surveys. The combination results of both surveys must be depicted in a form of ahydrogeology map (and its differential map), a block diagram depicting the aquifer, and aquifer system ina form of two dimensions. The other surface hydrogeology surveys use geological method. In contrast, theunderground hydrogeology survey use the electrical sounding method.

REAKTIVASI SESAR TUA DAN PENGARUHNYA TERHADAP PEMBENTUKAN STRUKTUR GEOLOGI DAN CEKUNGAN KUARTER DI DAERAH BANDUNG-GARUT -, Edy Sunardi
Bulletin of Scientific Contribution Vol 12, No 2 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The geological structure of faults on the pre-Tertiary basement rocks in West Java is the result of the activity of plate collision in the Cretaceous and Tertiary Age. The NE-SW direction of structural pattern is the pattern of major fault related to Cretaceous subduction, while other direction is related to Tertiary. The reactivation fault turned out to continue in Late Tertiary to Quaternary period. Baribis Fault, Cimandiri Fault, and Citanduy Fault which are formed in the Late Tertiary, faulted also Quaternary volcanic rocks.Some Quaternary structures forming sub-basin and heights, which shows genetically similar with its basement rocks. From subsurface geological data, the high and low patterns show similarity to the surface condition, such as under Bandung and Garut depressions, where horst and graben are found. Based on this finding, it can be concluded that there is fault reactivation from basement rocks to the surface.

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Home Page

OAI Link

Editorial Team

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Contact Name Muhammad Kurniawan Alfadli

Contact Email m.kurniawan@unpad.ac.id

Phone +6285669298592

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Location Kota bandung, Jawa barat INDONESIA

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Contact Name
Muhammad Kurniawan Alfadli

Contact Email
m.kurniawan@unpad.ac.id

Phone
+6285669298592

Journal Mail Official
bsc.ftg@unpad.ac.id

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Location
Kota bandung,

Jawa barat

INDONESIA