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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

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UMUR FORMASI CANTAYAN DI SUNGAI CIBEET CIANJUR Abdurrokhim, .; Isnaniawardhani, Vijaya; Muhamadsjah, Faizal
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.v17i1.21490

ABSTRAKFormasi Cantayan yang tersingkap di Sungai Cibeet disusun oleh batupasir dalam berbagai ukuran butir dan ketebalan, breksi dan batulempung. Di bagian bawah disusun oleh perselingan batupasir kasar, dengan ketebalan bervariasi antara 30 sampai dengan 60 cm, dan dapat bisa menumpuk hingga ketebalan lebih dari 5 meter. Sisipan batulempung sesekali muncul diantara batupasir tersebut. Lapisan breksi dijumpai hanya di bagian bawah dari formasi ini. Semakin ke atas batulempung semakin dominan dan batupasir semakin tipis dan halus.Sebanyak 15 (lima belas) contoh batuan telah dipilih untuk analisa paleontologi. Delapan contoh diambil pada lintasan bagian timur dan tujuh contoh telah diambil pada lintasan bagian barat. Sedikitnya 3 (tiga) datum umur dapat ditentukan dari kemunculan beberapa fosil indek yang penting diantaranya adalah: Globoroalia menardii, Globorotalia acostaensis, Globorotalia menotumida dan Hestigerina pelagica. Ketiga datum tersebut adalah N14-N15, N16 dan N17. Dengan demikian Formasi Cantayan yang tersingkap di Sungai Cibeet, Cianjur adalah berumur dalam rentang waktu antara N15 – N 17 (Miosen Akhir).Kata Kunci: Formasi Citayan, Cibeet, Paleontologi, Fosil IndexABSTRACTThe Cantayan Formation which is revealed on the Cibeet River is composed of sandstones in various grain sizes and thicknesses, breccia and claystone. At the bottom are arranged by coarse sandstone intervals, with thicknesses varying from 30 to 60 cm, and can be piled up to a thickness of more than 5 meters. Claystone inserts occasionally appear between these sandstones. The breccia layer is found only at the bottom of this formation. Increasingly the claystone is increasingly dominant and the sandstone is getting thinner and smoother.A total of 15 (fifteen) rock samples have been selected for paleontological analysis. Eight samples were taken on the eastern trajectory and seven samples were taken on the western trajectory. At least 3 (three) datum ages can be determined from the appearance of several important fossil indexes including: Globoroalia menardii, Globorotalia acostaensis, Globorotalia menotumida and Hestigerina pelagica. The three datums are N14-N15, N16 and N17. Thus the Cantayan Formation which was revealed on the Cibeet River, Cianjur is aged in the time span between N15 - N 17 (Late Miocene).Keywords: Citayan Formation, Cibeet, Paleontology, Index Fossil

KAJIAN GEOTEKNIK TERHADAP FORMASI TANJUNG DI PIT SAYUNA, SATUI, KALIMANTAN SELATAN, DENGAN MENGGUNAKAN METODE SLOPE MASS RATING -, Geni Dipatunggoro; -, Zufialdi Zakaria
Bulletin of Scientific Contribution Vol 10, No 2 (2012): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Lithology of Tanjung Formation from the oldest to the youngest layers consists of siltstone, mudstone, dan carbonaceous mudstone or sandstone layers with four coal seams. Strike of joint varied N28ºE to N48ºE, N188ºE to N245ºE and N284ºE to N354ºE, and dip of joint varied 52º to 88º (very steep). Weathering conditions of rocks at the surface are moderately weathered (WM) to slightly weathered (WS) stage, and some of this surficial soils are at highly weathered (WH) stage as top soisl. In the bor holes these kinds of weathering stages (WM and WS) are characterized by both law core recovery dan RQD. Sedimentary rock of layer the joint to formed rock blok is discontinuity plane (bedding plane dan joint). The classification system is according to Rock Mass Rating (RMR) after Bieniawski, 1973 to determine the Slope Mass Rating (SMR) resulting maximum angle of cut slope of the rock mass in a stable condition. Rock Mass Rating (RMR) of penetrated rocks of the Tanjung Formation in Bore Hole No. AW-1, AW-2, and AW-3 range from 35 to 70, 40 to 50, and 29 to 60 respectively. The class numbers of the rock mass are II and III in general, suggesting that yhe rock masses are stable (class II) to partially stable (class III), but in Bore Hole AW-1 and AW-2 at the depth ranging from 39.45 to 45.30 meters and 04.75 to 27.84 meters (3 rock masses) respectively class IV occur characterizing the instable rock masses.

LINGKUNGAN PENGENDAPAN FORMASI KALIBENG PADA KALA MIOSEN AKHIR DI KABUPATEN DEMAK DAN KABUPATEN SEMARANG, JAWA TENGAH BERDASARKAN RASIO FORAMINIFERA PLANGTONIK DAN BENTONIK (RASIO P/B) Jurnaliah, Lia; Muhamadsyah, Faizal; Barkah, Mochammad Nursiyam
Bulletin of Scientific Contribution Vol 14, No 3 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Research area is classified a Lower Kalibeng Formation. Its age is Lower Miocene. The total number of sediment samples is 29 samples that are carried out based on measured section with 10 metres interval. The whole samples are processed by hydrogen peroxide method. Foraminifers’ quantitative analyses is conducted on each one gram of dry sample. Based on ratio P/B value that range between 49.64% - 99.41%, Late Miocene Kalibeng Formation is deposited on marine environment. The depositional process is beginning from neritic (outer neritic) – oceanic (upper bathyal-lower bathyal) – neritic (outer neritic) - oceanic (upper bathyal – lower bathyal). Keywords: Kalibeng Formation, plangtonic and benthic foraminifera, neritic, oceanic Daerah penelitian merupakan Formasi Kalibeng bagian bawah berumur Miosen Akhir.. Pengambilan 29 sampel sedimen dilakukan secara sistematis berdasarkan penampang terukur dengan interval 10 meter. Seluruh sampel sedimen diproses dengn menggunakan metoda hydrogen peroksida. Analisis kuantitatif foraminifera dilakukan pada setiap 1 gram sampel kering berukuran >120 mesh. Berdasarkan hasil perhitungan rasio foraminifera plangtonik dan bentonik (rasio P/B) yang berkisar antara 49,64% - 99,41%, Formasi Sungaibeng Kala Miosen Akhir terendapkan pada lingkungan marin dimulai dari neritik (neritik luar) – oseanik (batial bawah-batial atas) – neritik (neritik luar) dan terakhir adalah oseanik (batial bawah-batial atas). Kata Kunci: Formasi Kalibeng, foraminifera plangtonik dan bentonik, neritik, oseanik

ANALISIS GEOKIMIA HIDROKARBON LAPANGAN “X” CEKUNGAN SUMATERA SELATAN -, Budi Muljana
Bulletin of Scientific Contribution Vol 5, No 2 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

South Sumatra Basin belong to back-arc basin that is one of profiliferous basin. This paper was explained result of analysis of geochemical datas for source rocks within “X” field area, south Sumetra Basin. The data was used from shale cutting of four wells, there are KTB-6, KTB-9, KTB-10 and KTB -11. Based on result of analysis was indicated a good TOC value for all of wells, the levels of maturity within KTB-2 and KTB-9 wells more high than two wells other and included on Tipe III, Based on Triangular diagram C-27,C-28,C-29, are setting of depositional environment included on Open marine (facies deltaic) to shelf margin, source of organic material was divided into three major groups of organic facies, there are C, CD and D organic facies, where there was supported by Carbon isotop analysis, source of material organic from non marine oils as well as diagram isoprenoid rasio indicated. Rock units in KTB-9 well could be attacted as reservoir and source rock.

DISTRIBUSI SUBMIKROFOSIL (POLEN DAN FORAMINIFERA) PADA DELTA FRONT DI DELTA MAHAKAM, KALIMANTAN TIMUR Jurnaliah, Lia; -, Winantris
Bulletin of Scientific Contribution Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The Research area located in the Mahakam Delta, East Kalimantan. The object of research are submicrofossils (pollen and foraminifera) in recent sample sediment derived from the delta front of Mahakam Delta. The amount of sediment that is researched as much as 29 samples. The results of the quantitative analysis showed pollen assemblage consists of 24 species of palmae, 21 species of mangrove and 117 species of non-mangrove. The collection of foraminifera consists of 82 species of small benthonic foraminifera. Based on cluster analysis, pollen assemblage consists of seven biofacies i.e. palmae-non mangrove, non-mangrove A, palmae-mangrove-non mangrove A, palmae-mangrove-non mangrove B, mangrove-non mangrove, palmae, and non-mangrove B . Similarly, foraminifera consists of seven biofacies i.e. biofacies I (Inner Shelf), biofacies II (Coastal lagoon-InnerShelf), biofacies III (Coastal bay – Inner Shelf), biofacies IV (Coastal lagoon/Coastal bay-Inner Shelf), biofacies V (Open estuary/Coastal lagoon-Inner Shelf), biofacies VI (Coastal bay/Coastal lagoon-Inner Shelf) and biofacies VII (mangrove swamp (marsh). The distribution of pollen and foraminifera in delta front suggest that the southern region was more influenced by sea compared with the northern region, and the central region is affected by tidal currents.

KARAKTERISTIK AIR TANAH PADA AKIFER VULKANIK DI LERENG TENGGARA GUNUNG PULOSARI, PANDEGLANG, PROVINSI BANTEN Listiawan, Yudhi; Hadian, Mohamad Sapari Dwi; Muda Iskandarsyah, Teuku Yan Waliana; Muhammad, Azwar Satrya; Barkah, Mochamad Nursiyam
Bulletin of Scientific Contribution Vol 18, No 1 (2020): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Gunung Pulosari merupakan Gunung Api strato yang terletak di daerah Pandeglang Provinsi Banten. Daerah penelitian disusun oleh batuan vulkanik yang memiliki potensi air tanah yang besar. Masih sedikitnya ekploitasi air tanah, membuat daerah di sekitar Gunung Pulosari ini menarik untuk diteliti kondisi hidrogeologinya.Tujuan dari penelitian ini adalah menentukan karakteristik air tanah berdasarkan sifat fisik dan kimia air tanah serta kaitannya dengan kondisi geologi yang berkembang di daerah penelitian dengan melakukan pemetaan hidrogeologi. Dari hasil pemetaan hidrogeologi dan didapatkan sebanyak 13 lokasi pengamatan yang terdiri 10 mata air dan 3 sumur gali. Sifat fisik air menunjukan karakteristik yang homogen, nilai Daya Hantar Listrik (DHL) 60 sampai 190 μS/cm, Zat Padat Terlarut (ZPT) dari 20 sampai 90 mg/L, pH dari 4,7 sampai 8,2 dan suhu air dari 25 sampai 26,9 oC. Sebanyak 5 sampel dilakukan uji kimia air tanah untuk di analisis fasies kimia air dengan diagram triliniear Piper.Dari hasil penelitian didapatkan fasies kimia air tanah di daerah penelitian didominasi oleh Ca:HCO3 dan satu lokasi (P-3) Ca.Na:HCO3. Hal ini mengindikasikan bahwa air tanah masih dipengaruhi oleh kondisi permukaan dan sistem alirannya masih bersifat lokal.

TEKTONOSTRATIGRAFI CEKUNGAN OMBILIN SUMATERA BARAT Mulyana, Budi
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 | DOI: 10.24198/bsc.v3i2.7455

Ombilin Basin is represent basin intramontane which limited by volcano-plutonic of Bukit Barisanand zona of Sumatera Fault system which representing a active strike-slip fault zone in west andmetasedimen rock in. Form of fisiography Ombilin Basin show a hilly at part of edge of east-west untilto north with precipitous morphology and level-off continent. Ombilin Basin basement is divided twopart, that is structured basement by Mergui terrain and Woyla terrain. Eldest Basement of Ombilin Basinis Formation of Limestone crystallin of Silungkang (age Perm) which laid bare at Tanah Hitam whichrepresent the part of Mergui terrains continent.Tectonism of Ombilin Basin is started at Paleogen related to peripatetic Southeast Asia tectonismwhich moving of India Block to northern. Early Paleogen, Ombilin Basin is formed with early motion oftranstensional effect of strike-slip fault motion of duplex regional, that is graben part of northeastOmbilin Basin. Motion of strike-slip fault are Sitangkai fault and Silungkang fault where this faultsmotion result attraction style in the form of normal fault by terrace to left north-south. This fault patterncontrol forming of first basin cause to be formed its faults which instructing northwest-southeast, northsouth,and northeast-soutwest of west-east. Tectonostratigraphy Ombilin Basin is represent full grabenwith set of deposits syn-rift tectonostratigraphy and of post-rift deposits continue at mechanism oftransgressive in the early Neogen.

GEOLOGI TEKNIK JATINANGOR: STUDI DAYADUKUNG TANAH BERDASARKAN PREDIKSI KADAR AIRTANAH UNTUK MENUNJANG ECO-CAMPUSS DI JATINANGOR Sophian, Irvan; Zakaria, Zufialdi; Prianda, Yogi; Utomo, Rizky Narendra
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 | DOI: 10.24198/bsc.v12i1.8360

Research location at Rector Building area, Unpad Campus, Jatinangor. The study is a part of research of Jatinangor engineering geology. Strength prediction of soil bearing capacity for shallow foundation is performed by measuring the water content of the soil at four locations sampled. Based on the formula of Hirnawan & Zakaria (1991), a variable value of unit weight (γ) = 1.73 T/M3; cohesion (c ) = 7.80 T/M2; and angle of friction= 13.69 degrees. The soil variables based on the value of water content by 43.85%. The result of soil bearing capacity (in dry conditions) around the ground surface of the rector building area is as follows: Type of foundations Square = 17,732 T/M2; Circular foundation type = 17,708 T/M2; Continuous foundation type = 13.714 T/M2. In wet conditions, the value of carrying capacity must be calculated again.

MANGANESE PROSPECT IDENTIFICATION USING MAGNETIC AND INDUCED POLARIZATION METHODS Taufan, Yoqi Ali; ilmi, irpan; 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

Surveys have been carried out using Magnetic and Induced Polarization methods over area dominated by Bobonaro complex formation. This survey was conducted with the purpose to identify a mineral source using data of magnetic, conductivity and resistivity of rock. Data acquisition applied 5 m dipole space with 50 m maximal depth coverage.The interpretation was conducted by analyzing 2D and 3D sections of resistivity inversion, subsurface Induced Polarization, and geomagnetic anomaly. The interpretation result of chargeability anomaly indicates that mineral source occurred as a mineral of manganese with thin layer spreading in complex structural sediment. As is shown from IP anomaly supported by magnetic data obtained, the anomaly has a spread of 3 m to 10 m depth from the surface. The trend of anomaly has a continuity at other locations where is predicted as the manganese mineralization source.

LINGKUNGAN TEKTONIK OFIOLIT KOMPLEK MELANGE CILETUH JAWA BARAT BERDASARKAN PENDEKATAN PETROLOGI -, Aton Patonah
Bulletin of Scientific Contribution Vol 9, No 3 (2011): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The ophiolite sequence of Ciletuh Melange Complex consist of serpentinite, serpentinized harzburgit, dunit, gabro and basalt. Part of the ophiolite partly has been metamorphismed, produce metamorphic rocks. The result of mineral chemical analisis which is supported by geochemical date, the rock shows that the similar character with Duaga Island – Witu Island, Papua Newguinea and Mariana Trench Island arc, that is Island Arc It is signed by the low of forsterite (80-82), there is the existence of magmatic impregnation process, the low Al content in pyroxen showed the increase of degree of partial melting which followed by the increase Si, Mg and Ca content, meanwhile Ti, Cr and Na content decrease followed by the increase degree of partial melting. The ophiolite rock which appear in complex mélange Ciletuh has closed relationship with tectonic setting process which happened in that area. Those approximately happened on Tersier age (Eosen- lower Oligosen), that is accretional is formed in complex mélange Ciletuh, subduction zone move to the west with the direction north-northwest – south-southeast by the appearance of litological, by the present of ultramafics rocks which tectonized and consist of serpentinite and pillow lavas and mixed with sedimen pond. As the same time, also is formed obduction so that result metamorphism process and became metamorphic rock.

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