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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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QUARTZ VEIN INFILL STRUCTURE MODE IN KENCANA DEPOSIT, GOSOWONG GOLDFIELD, INDONESIA Electricia, K.S.; Rosana, Mega F.; Yuningsih, Euis Tintin; Syafri, Ildrem; Viqnoriva, S.N.
Bulletin of Scientific Contribution Vol 15, No 1 (2017): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (751.317 KB)

ABSTRACTGosowong province has economic mineralisation which is classified as low sulphidation epithermal veining system containing high-grade of gold and silver. It is characterizes by various veins hosted in Holocene Quaternary volcanic rocks, mineralisation generally occurs in host rock andesite. The Kencana epithermal vein system in Gosowong Au-Ag district hosted by two main sub-parallel North-West trending major fault structures, named Kencana One (K1) and Kencana Two (K2) with strike lenght extend up to 600m. Both structures joined by link structures, appears to be Kencana Link (K-Link) as the thickest link structure. The Kencana One (K1) is the first underground mine in Gosowong district. The nature of underground conditions at Kencana has a high variability of gold grades. Thus due to extremely high grades ore in Kencana, it is need to be precise and thoroughly handling to obtain best results. Primary mineralisation occurs in multistage veins, breccias and stockwork veins as infill structures. This study confirming that there is a strong correlation between quartz vein infill structure mode versus gold grade which classified into (1) 1.01-3.0g/t Au, dominated with wall-rock breccia and stockwork, (2) 3.01-6.0g/t Au, dominated with wall-rock breccia follows by stockwork, (3) 6.01-20.0g/t Au, dominated with wall-rock breccia follows by quartz lode and stockwork, (4) 20.01-80.0g/t Au, dominated by wall-rock breccia follows by vein breccia and quartz lode, (5) >80g/t Au, dominated by wall-rock breccia. In terms of production quartz vein infill mode together and quartz vein texture with gold grade has been used as the main reference for geologist to make a direction in the process of ore drive determination in underground mining operations. Keywords: Kencana, low sulphidation epithermal, quartz vein infill modeSARIGosowong memiliki mineralisasi ekonomis yang merupakan epitermal sulfida rendah yang mengandung emas dan perak dengan kadar tinggi. Cebakan dicirikan dengan kehadiran urat yang bervariasi dengan batuan vulkanik kuarter sebagai batuan induk berumur Holosen, mineralisasi umumnya terjadi di dalam batuan induk andesit. Kencana berada di dalam area Cebakan Au-Ag Gosowong. Kencana terdiri dari dua struktur besar yang berdampingan, dinamakan Kencana Satu (K1) dan Kencana Dua (K2) dengan arah jurus sepanjang 600m. Keduanya dihubungkan dengan struktur yang dinamakan Kencana Link (K-Link) yang merupakan struktur bukaan yang paling tebal. K1 adalah tambang bawah tanah pertama di Gosowong. Kondisi bawah tanah di Kencana menunjukkan variasi tubuh bijih emas yang mengandung kadar emas yang bervariasi. Dengan adanya kadar emas yang tinggi, maka penangannya harus tepat dan seksama untuk mendapatkan hasil terbaik. Secara umum mineralisasi terjadi secara bertahap dalam urat kuarsa, breksiasi, dan urat stockwork. Penelitian ini menegaskan bahwa terdapat korelasi yang kuat antara tipe struktur urat kuarsa dengan kadar emas yang diklasifikasikan menjadi (1) 1.01-3.0 g/t Au, didominasi oleh breksiasi batuan dinding dan stockwork, (2) 3.01-6.0 g/t Au, didominasi oleh breksiasi batuan dinding diikuti oleh stockwork, (3) 6.01-20.0 g/t Au, didominasi oleh breksiasi batuan dinding diikuti oleh quartz lode dan stockwork (4) 20.01-80.0 g/t Au, didominasi oleh breksiasi batuan dinding diikuti oleh breksiasi urat kuarsa dan quartz lode (5) > 80g/t Au, didominasi oleh breksiasi batuan dinding. Di dalam proses produksi, tipe struktur urat kuarsa dan tekstur urat kuarsa bersama dengan kadar emas menjadi petunjuk untuk geolog dalam menentukan arah penambangan emas di dalam tambang bawah tanah.Kata kunci: epitermal sulfida rendah, Kencana, tipe struktur urat kuarsa

IDENTIFIKASI DAMPAK POTENSIAL PEMBANGUNAN TERMINAL TRANSIT DI BAU-BAU, PROPINSI SULAWESI TENGGARA -, Achmad Sjafrudin
Bulletin of Scientific Contribution Vol 6, No 1 (2008): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Fuel needs that keeps on increasing in Makasar can not be fullfilled by the Makasar installation, therefore it is necessary to built Bau-Bau Transit Terminal in Southeast Sulawesi Province.The construction will raise effects towards environment. Hence the needs of EIA study is very crucial to minimize all the effects that will appear in the future to support sustainable development.

ASAL SEDIMEN BATUPASIR FORMASI JATILUHUR DAN FORMASI CANTAYAN DAERAH TANJUNGSARI DAN SEKITARNYA, KECAMATAN CARIU, KABUPATEN BOGOR, PROVINSI JAWA BARAT Widyastuti, Sari; Abdurrokhim, Abdurrokhim; Sendjaja, Yoga Adriana
Bulletin of Scientific Contribution Vol 14, No 1 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Administratively, Tanjungsari and its vicinity area lies within Bogor Subprovince, West Java – Indonesia. According to Java’s physiographic map by Van Bemmelen (1949), this area can be included as a part of the Bogor Zone. The goal of this research is to analysis samples of sandstone from Jatiluhur Formation and Cantayan Formation due to know the provenance of the formation. Sandstone from Jatiluhur Formation is Feldspathic Wacke and sandstone from Cantayan Formation is Lithic Arenite based on the sandstone classification by Pettijohn, 1975. According to the grain composition, the provenance of Jatiluhur Formation is the plutonic igneous rock, it shown by the quartz grain dominated by monocrystaline grain with non-undulatory extinction. Feldspar is dominated by Potassium Feldspar. While the Cantayan Formation came from volcanic igneous rock, known by the abundance of igneous rock fragment with afanitic texture. The quartz grain is the less, consist of monocrystaline quartz with non – undulatory extinction. Based on the tectonic setting of the source rock, sandstone from Jatiluhur and Cantayan Formation came from the rock that part of Magmatic Arc area which the sediment source of Jatiluhur Formation is from Dissected Arc, while Cantayan Formation is from Transitional Arc – Undissected Arc area. Keyword: Tanjungsari, Jatiluhur Formation, Cantayan Formation, sandstone, provenance. Secara administratif, daerah Tanjungsari dan sekitarnya termasuk kedalam wilayah Kabupaten Bogor, Propinsi Jawa Barat, dan terletak di dalam Zona Bogor menurut pembagian fisiografi oleh Van Bemmelen (1949). Tujuan penelitian ini yaitu melakukan analisis pada contoh batupasir Formasi Jatiluhur dan Formasi Cantayan guna mengetahui sumber sedimen pembentuk formasi tersebut. Batupasir Formasi Jatiluhur termasuk jenis Feldspathic Wacked dan batupasir Formasi Cantayan termasuk jenis Lithic Arenite berdasarkan klasifikasi batupasir oleh Pettijohn, 1975. Dari komposisi sedimen yang diamati, Formasi Jatiluhur berasal dari batuan beku plutonik ditunjukkan oleh butir kurasa yang didominasi oleh butiran monokristalin dengan sudut pemadaman lurus. Jumlah butir feldspar didominasi oleh K feldspar. Sedangkan batupasir Formasi Cantayan berasal dari batuan beku vulkanik, diketahui dari jumlah fragmen batuan yang sangat banyak berupa batuan beku bertekstur halus. Jumlah butir kuarsa ditemukan sangat sedikit berupa kuarsa monokristalin dengan sudut pemadaman lurus. Berdasarkan tatanan tektonik batuan sumber, batupasir Formasi Jatiluhur dan Formasi Cantayan berasal dari batuan yang berada pada tatanan tektonik busur magma (Magmatic Arc) yang mana Formasi Jatiluhur bersumber dari area Dissected Arc, sedangkan Formasi Cantayan berasal dari area Transitional Arc – Undissected Arc. Kata kunci: Tanjungsari, Formasi Jatiluhur, Formasi Cantayan, batupasir, sumber sedimen.

ANALISIS KIMIA BATUAN BASEMEN GRANITOID DI SUB CEKUNGAN JAMBI, SUMATRA SELATAN BERDASARKAN DATA DARI SUMUR JSB-3, JSB-4 DAN JSB-6 -, Euis Tintin Yuningsih
Bulletin of Scientific Contribution Vol 4, No 2 (2006): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v4i2.8120

Research area located at Jambi sub basin, the northern part of South Sumatra Basin formed during Tertiary. The propose of the research is to determine petrological characteristics of pre-Tertiary basement rock based on major oxides analysis from the granitoid basement rock in research area with AAS method (Atomic Absorption Spectrophotometry) so the petrogenesis could be determined including kinds and characteristics of parent magma. Chemical rock analysis confirm the lithology of granitoid basement in Jambi sub basin are intermediate – acid magmas, calc-alkaline, medium – high K, metalluminous, subduction-related (orogen) at active continental margin. Granitoid at JSB-4 and JSB-6 shows magnetite series and I type. This Mesozoic granitoid probably as extension from the Thailand and Burma granite province, that underline the fact that there has been a history of subduction-related magmatism along Southwestern edge of Sundaland since earliest Mesozoic times.

LINGKUNGAN PENGENDAPAN SATUAN BATULEMPUNG SISIPAN BATUPASIR PADA FORMASI KEREK DAERAH JUWANGI DAN SEKITARNYA, BERDASARKAN KARAKTERISTIK LITOLOGI, ANALISIS STRUKTUR SEDIMEN, DAN KANDUNGAN FOSIL BENTONIK Morina, Hana; Syafri, Ildrem; Jurnaliah, Lia
Bulletin of Scientific Contribution Vol 12, No 3 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The research area is located in the Juwangi, Grobogan District, Central Java Province. Geographically located between 110o 44’ 19,536” BT – 110o 49’ 19,5384” BT dan 7o 13’ 53,2704” LS – 7o 8’ 53,2716” LS. Research using the method geological surface mapping. Determination of depositional environment unit based on the characteristic of lithology, sedimentary structures, and benthic foraminiferal. Based on the characteristic of lithology, this unit composed of mudstone and sandstone. Mudstone has a consideralable thickness, as sandstones insert. Sedimentary structures that are found in the form of parallel lamination and cross lamination shows that its transport medium is water. Benthic foraminiferal analysis result indicate that the bathymetry zone is outer neritic. So it can be estimated that the depositional environment of this unit are in the shallow marine.

OSTRACODA MIOSEN DARI FORMASI CIMANDIRI, SUKABUMI, JAWA BARAT FAUZIELLY, LILI; Winantris, .; Jurnaliah, Lia; Solihin, .; Fitriani, Ria
Bulletin of Scientific Contribution Vol 17, No 2 (2019): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRAKLima belas spesies fosil ostracoda berumur Miosen dari Formasi Cimandiri telah dianalisis dari 6 conto sedimen yang berasal dari penampang stratigrafi lintasan S. Cimerang, Sukabumi. Analisis mikrofosil secara kuantitatif , memperlihatkan ostracoda Miosen tersebar pada litologi batulempung. Ostracoda yang melimpah pada lintasan ini adalah Hemicytheridea ornata, Cytherella hemipuncta, Hemicytheridea reticulata, Cytherelloidea excavata, Cyherella javaseanse, and Keijella carrirei.Berdasarkan kumpulan ostracoda, diketahui bahwa lingkungan pengendapan daerah penelitian adalah laut dangkal.Kata kunci: Ostracoda, Miosen, Cimandiri, Lingkungan Pengendapan, Batulempung.ABSTRACTFifteen species of fossil Ostracoda are describe from six sediment samples from Middle Miocene Cimandiri Formation, Sukabumi, West Java define from geological measure section profile Cimerang River. Microfossil Analysis based on quantitatively method, the distribution of Miocene Ostracoda be discovered in claystone lithology. Abundant ostracods are Hemicytheridea ornata, Cytherella hemipuncta, Hemicytheridea reticulata, Cytherelloidea excavata, Cyherella javaseanse, and Keijella carrirei. Based on the distribution of Ostracoda, it is known that the depositional environment of the study area is shallow sea.Keyword: Ostracoda, Miocene, Cimandiri, Depositional Environment, Claystone.

LITOSTRATIGRAFI CEKUNGAN OMBILIN BERDASARKAN INTERPRETASI CITRA SATELIT -, Yuyun Yuniardi
Bulletin of Scientific Contribution Vol 8, No 1 (2010): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Stratigraphy of Ombilin Basin area was interesting for make some research. The research did use remote sensing interpretation to made geological interpretation map which is containing information about lithostratigraphic unit distribution in Ombilin Basin area. LithoStratigraphic of Ombilin Basin from old to young were Brani Formation, Sangkarewang Formation, Sawahlunto Formation, Sawahtambang Formation, and Ombilin Formation.

Dampak Limbah Penambangan Emas Tanpa Izin (Peti) Terhadap Kualitas Air Sungai Limun Kabupaten Sarolangun Propinsi Jambi - The Impact Of Illegal Gold Mining Activity To The Water Quality Of Limun River, Sarolangun District, Jambi Province Yulianti, Rita; Sukiyah, Emi; Sulaksana, Nana
Bulletin of Scientific Contribution Vol 14, No 3 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Daerah penelitian terletak di desa Muaro Limun, Kecamatan Limun Kabupaten Sarolangun Provinsi Jambi. Sungai limun, salah satu sungai besar di daerah kabupaten sarolangun yang dimanfaatkan oleh mayarakat sekitarnya sebagai sumber penghidupan. Penelitian bertujuan untuk mengetahui pengaruh kegiatan penambangan terhadap kualitas air sungai Batang Limun, dan perubahan sifat fisik dan kimia yang diakibatkan kegiatan penambangan.Metode yang digunakan adalah metode grab sampel, serta stream sedimen untuk dianalis di laboratorium. Sejumlah sampel diambil di beberapa lokasi Penambangan Emas berdasarkan Aliran Sub-DAS dan dibandingkan dengan beberapa sampel lain yang diambil pada lokasi yang belum terkontaminasi oleh kegiatan penambangan. Analisis kualitas air mengacu pada SMEWWke 22 tahun 2012 dan standar baku mutu air kelas II dalam PP No 82 yang dikeluarkan oleh Menteri Kesehatan No. 492/Menkes/Per/IV/2010. Diketahui sungai Batang Limun telah mengalami perubahan karakteristik fisika dan kimia. Dari grafik kosentrasi kekeruhan, pH, TSS, TDS Cu, Pb, Zn, Mn, Hg terlihat bahwa penambang emas tanpa izin (PETI) dengan cara amalgamasi yang menyebabkan terjadinya penurunan kualitas air sungai. Sejak tahun 2009 sampai tahun 2015 sungai Limun dan sekitarnya terus mengalami penurunan kualitas air. Penurunan kualitas yang cukup tinggi terjadi yaitu peningkatan nilai Rata-rata konsentrasi merkuri pada sungai Batang Limun dari 0,18ppb (0,00018 mg/l) menjadi 0,3ppb (0,0003 mg/l), peningkatan tersebut dipengaruhi oleh proses kegiatan penambangan dan nilai tersebut masih dibawah standar baku mutu air kelas II pp nomor 82 tahun 2010.Kata kunci : Kualitas Air, Sungai Limun,TSS, Merkuri, PETI Limun river is one of the major rivers in the area of Sarolangun, which utilized by the society as a source of livelihood. The aim of study to analyze the effect of mining activities on the water quality of Batang Limun River, and the changes of physical and chemical properties of water. The method used are grab and stream samples to sediment analyzed in the laboratory. A number of samples were taken at several locations based Flow Gold Mining Sub-watershed and compared to some other samples taken at the location that has not been contaminated by mining activities. Water quality analysis referring to SMEWW, 22nd edition 2012 and refers to Regulation No 82 that issued by Minister of Health No. 492 / Menkes / Per / IV / 2010.The results showed that the Limun river has undergone chemical changes in physical characteristics. These symptoms can be seen from the discoloration of clear water in the river before the mine becomes brownish after mining, based on graphic of muddiness concentration: pH, TSS, TDS Cu, Pb, Zn, Mn, Hg have seen that the illegal miner which used amalgamation caused deterioration in water quality, data from 2009 to 2015 Limun river and surrounding areas continue to experience a decrease in water quality. The decreasing of water quality showed in the TSS parameter which found in the area is to high based on the standard of water quality class II pp number 82 of 2010. An increase in the value of average concentrations of mercury in the Batang Limun river before mine 0,18ppb (0.00018 mg / l) into 0,3ppb (0.0003 mg / l) on the river after the mine. The increase was affected by the mining activities and the value is still below the air quality standard Grade II pp numbers 82 years 2010, although the value is still below with the standards quality standard, the mercury levels in water should still be a major concern because if it accumulates continuously in the water levels will increase and will be bad for health. In contrast to the concentration of mercury in sediments that have a higher value is 153 ppb (0,513ppm ) .Key Words : Water Quality, Limun River, Mercury, Illegal gold mining

STUDI GEOKIMIA BATUAN VULKANIK PRIMER KOMPLEKS GUNUNG SINGA - GUNUNG HULU LISUNG, BOGOR - JAWA BARAT -, Johanes Hutabarat
Bulletin of Scientific Contribution Vol 5, No 3 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The research about study on geochemistry volcanic rocks of Gunung Singa - Gunung Hulu Lisung, Nanggung, Bogor, West Java.Samples of the Gunung Singa-Gunung Hulu Lisung were extensively analyzed for major oxides and trace elements. Compositions of geochemical samples have been plotted and are used in drawing petrogenetic inferences. volcanic rocks Gunung Singa - Gunung Hulu Lisung belong to the medium calc-alkalic to high Calc-alkalic dacite suite, and have SiO2 contents in the range of 61,34-68,55%, high Al2O3 (14,99-19,63%) and low TiO2 content and relatively high K2O (1,90-2,55%)Oxide variation diagrams for the Gunung Singa-Gunung Hulu Lisung show linear trend with much scatter. This is partially due to the fact that SiO2 makes up an increasing percentage of silicic rocks allowing less scatter in the other oxides. However, we suggest that mich of the scatter is due to mixing of variably fractionated basaltic magma with silicic magma

TINJAUAN KETERDAPATAN BATUAN ULTRAMAFIK DALAM KOMPLEK OFIOLIT CILETUH DI DAERAH CILETUH, JAWA BARAT Hutabarat, Johanes; -, Ismawan
Bulletin of Scientific Contribution Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Ultramafic rock is defined as rock with a color index of more than 70, and most have good characteristics as igneous plutonic and metamorphic rocks. Ultramafic rocks in the area Ciletuh revealed in outcrops scattered as "pockets" (enclaves) in Ciletuh formation, with the tendency of azimuth northeast trending ± southwest, which gives the impression of intrusion body, or as blocks of exotic in Ciletuh Formation. Rock composed of peridotite and serpentinite of massive to foliated; associated with gabbro, basalt pillow structure. Association of peridotite-serpentinite with gabbro, basalt structure of the pillow, giving the impression that the rock may represent parts of the set ophiolite. Based on occurences in the field, where the body is suspected origin of ultramafic rocks in the ophiolite complex Ciletuh speculated a continuous sheet relicts oceanic crust that is emplaced above microcontinent. Part sheet becomes incomplete (dismembered) during emplacement, and then buried (burial) by next geological events (possible sedimentation process produces Formation Ciletuh) that largely hides covered by ofiolitic, and leaving only the ultramafic body which spread in most Ciletuh areas at West Java.

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