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Bulletin of Scientific Contribution : Geology
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 364 Documents
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ANALISIS HASIL AIR (“WATER YIELD”) BERDASARKAN DEBIT ALIRAN SUNGAI, DTA CITARIK BAGIAN HULU, DESA TANJUNGWANGI, KECAMATAN CICALENGKA, KABUPATEN BANDUNG JAWA BARAT Edi Tri Haryanto; Hendarmawan Hendarmawan; Emi Sukiyah; Benny Joy
Bulletin of Scientific Contribution: GEOLOGY 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 (909.79 KB)

Abstract

AbstrakPenelitian hasil air berdasarkan debit aliran sungai Daerah Tangkapan Air (DTA) Citarik Hulu, Jawa-Barat  ini bertujuan untuk mendapatkan data hasil air dan analisis debit aliran pada sungai-sungai kecil yang ada di Desa Tanjungwangi, Kecamatan Cicalengka, Kabupaten Bandung, dan Desa Sindulang, Kecamatan Cimanggung, Kabupaten Sumedang,  Jawa-Barat. Metoda penelitian adalah dengan melakukan pengukuran debit aliran sungai menggunakan alat “current meter” dan pengukuran curah hujan dengan alat ukur curah hujan manual, dengan mencatatan harian. Hasil penelitian menunjukkan bahwa hasil air (“water yield”) rata-rata harian pada sub-sub DAS di sebelah selatan, yaitu di Desa Tanjungwangi lebih kecil disbanding  dengan sub-sub DAS di sebelah utara  di Desa Sindulang, Kecamatan Cimanggung, Kabupaten Sumedang, disebabkan oleh  prosentase air yang  tersuplesi ke dalam air tanah, sub-DAS di sebelah selatan  lebih besar.AbstractThe research of  water  yield  based on  river flow  of   Upper  Citarik Catchments, West-Java aims to get water yield data and to analyze flow discharge of small rivers in Tanjungwangi Village, Cicalengka Sub District, Bandung Regency, and small rivers in  the village of  Sindulang,  Cimanggung Sub-District, Sumedang Regency, West Java.  The research  method  is by measuring the flow discharge of the river using "current meter" and  measuring daily  rainfall with  rainfall  measurements  devices manually. The results showed that daily average  water yield  in the  south ,sub-sub-catchments which is in the village of Tanjungwangi smaller that of the north  sub-catchments in the village of Sindulang  due to the percentage of water that infiltrate in to the groundwater, sub-catchment in south were larger.
POLA STRUKTUR REGIONAL JAWA BARAT Faisal Helmi; Iyan Haryanto
Bulletin of Scientific Contribution: GEOLOGY Vol 6, No 1 (2008): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (559.015 KB) | DOI: 10.24198/bsc geology.v6i1.8160

Abstract

Regional structure of West Java influenced by interaction of subduction between India-Australia plate with Eurasia plate. Effect of this subduction, in West Java expand some fault structure which devide to 4 faults, that is north-south faults, northwest-southeast faults, and northeast-southwest faults.Fault of North-South which devide into Sunda Pattern, is representing oldest fault and forming of Paleogen Basin in West Java. Stress system of Sunda Pattern is influenced by transtensional tectonic and as a whole form structure pattern of negative structure flower.Change of tectonics in West Java take place at Plio-Plistosen period. At that moment system of stress influenced by tectonic compression yielding fold structure of wast-east thrust-fault (Java Pattern). At same tectonic period, formed a number of northwest-southwest strike-slip fault (Sumatera Pattern) and northeast-southwest strike-slip fault (Meratus Pattern).
BIOZONASI FORAMINIFERA PLANKTONIK DI LINTASAN SUNGAI CIPAMINGKIS, DAERAH JONGGOL, PROVINSI JAWA BARAT Mohamad Solihin; Abdurrokhim Abdurrokhim; Lia Jurnaliah
Bulletin of Scientific Contribution: GEOLOGY Vol 14, No 1 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1285.06 KB) | DOI: 10.24198/bsc geology.v14i1.9791

Abstract

The study was conducted at Jatiluhur Formation in Cipamingkis River, Jonggol, Bogor, West Java. The purpose of this study is to determine biodatum of  planktonic foraminifera and age specifications contained in Jatiluhur Formation. The method that used in this study based on measured section data and micropaleontology analysis quantitatively. Cipamingkis River measured section approximately 8 km, divided by 4 sections. Measured section and each of them used to 10 samples to biostratigraphy analysis. Based on biostratigraphy analysis of planktonic foraminifera, Jatiluhur Formation depositioned at Middle Miocene – Late Miocene (N13 – N16). Biodatum of foraminifera found in study area are Globigerinoides subquadratus, Globorotalia siakensis Globorotalia mayeri, Globorotalia menardii, and Globorotalia acostaensis. Keywords : Cipamingkis river, Biodatum, Planktonic Foraminifera, Jatiluhur Formation. Kajian ini dilakukan pada Formasi Jatiluhur di Sungai Cipamingkis, Daerah Jonggol, Kabupaten Bogor, Jawa Barat.  Tujuan penelitian ini untuk menentukan biodatum foraminifera planktonik dan spesifikasi umur yang terdapat pada Formasi Jatiluhur.  Metode yang digunakan dalam penelitian ini adalah berdasarkan data penampang stratigrafi terukur dan analisis mikropaleontologi secara kuantitatif. Sekitar 8 km lintasan sungai Cipamingkis, dapat dibagi menjadi 4 penampang stratigrafi terukur dan masing-masing penampang digunakan 10 conto batuan untuk analisis biostratigrafi. Berdasarkan analisis biostratigrafi dari foraminifera planktonik, Formasi Jatiluhur terendapkan pada kala tengah Miosen Tengah – awal Miosen Akhir (N13 – N16). Biodatum Foraminifera yang ditemukan di daerah penelitian adalah Globigerinoides subquadratus, Globorotalia siakensis Globorotalia mayeri, Globorotalia menardii, dan Globorotalia acostaensis. Kata Kunci : Sungai Cipamingkis, Biodatum, Foraminifera planktonik, Formasi Jatiluhur.
EXTENSION TEKTONIK SELAT SUNDA Budi Mulyana -
Bulletin of Scientific Contribution: GEOLOGY 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 | Full PDF (616.69 KB) | DOI: 10.24198/bsc geology.v4i2.8123

Abstract

Sumatra and Java Islands are representing a part of Sunda arc from plate of southern Eurasia. It started from north Andaman sea of Aceh-Sumatra-Jawa to southern Sumbawa island. Its network is including into island arc systems with mechanism of subduksi between Indo-Australian to Eurasia plates. Change of direction and speed of Indo-Australia plate subduction to Eurasia plate is started normally in part of Southern Java - Java Trench - becoming subduction oblique at Sumatra Trench. Change of the pattern cause to be formed its Fault Sumatra System (Fault of Semangko and Fault laugh) at Sumatra Island tinder, mark with lines Sunda strait volkanic area start from eldest of Sukadana, Krakatau Compleks to Panaitan young island. Change pattern direction of speed and movement of Indo-Australia plates to Eurasia plates is very interconnected sliver with effect of movement of India plate of collision the India continent. 
PETROLOGI DAN PETROGRAFI SATUAN BREKSI VULKANIK DAN SATUAN TUF KASAR PADA FORMASI JAMPANG, DAERAH CIMANGGU DAN SEKITARNYA, JAWA BARAT Puteri Rasdita M. Verdiana; Yuyun Yuniardi; Andi Agus Nur
Bulletin of Scientific Contribution: GEOLOGY Vol 12, No 3 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (677.627 KB) | DOI: 10.24198/bsc geology.v12i3.8378

Abstract

The research area is located at Cimanggu Region, Langkaplancar and Pamarican Subdistrict, Ciamis, Tasikmalaya, and Pangandaran District, West Java Province. Geographically, research area located at coordinate 07o27’35,7768” to 07o32’35,7768” South Latitude and 108 o23’,482” to 108 o28’1,4844” East Longitude. Broad of research area is + 100 km2. According to unofficial lithostratiraphy, research area divided into five unit, that is Volcanic Breccia Unit, Coarse Tuff Unit, Carbonateous Sandstone Unit, Tuffaceous Sandstone, and Fine Tuff Unit.Petrology and petrography analysis of Volcanic Breccia Unit and Coarse Tuff Unit (Jampang Formation) are based on megascopic description of hand specimen sample and microscopic description of thin section. Volcanic Breccia Unit consist of volcanic breccia that composed by porphyry andecite-porphyry basalt clast with trachitic texture and crystal tuff as matrix, also porphyry andecite lava with trachitic texture and altered because secondary minerals (chlorite and secondary quartz) was identified at thin section. Coarse Tuff Unit consist of interbedding coarse tuff and fine tuff, but coarse tuff was dominant. Based on petrography analysis, coarse tuff is crystal tuff that composed by volcanic glass as matrix, and quartz and plagioclase as mineral fragment.
KONTROL MINERALOGI TERHADAP “PROBLEMATIC ORE” CADANGAN GRASBERG BLOCK CAVE (GBC) TAMBANG BAWAH TANAH FREEPORT INDONESIA DI PAPUA Aiwoy F. G; Ildrem Syafri; Euis Tintin Yuningsih
Bulletin of Scientific Contribution: GEOLOGY Vol 16, No 1 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1044.398 KB)

Abstract

Grasberg Block Cave adalah tambang bawah tanah yang merupakan kelanjutan dari Cadangan Grasberg yaitu sebuah tambang terbuka yang berada di atasnya. Tambang ini juga termasuk dalam Kontrak Karya A (COW “A”) PT. Freeport Indonesia, Distrik Ertsberg, Papua. Besarnya cadangan Grasberg Block Cave tersebut pada akhir Januari 2015 adalah 1.011 milyar ton dengan kandungan tembaga (Cu) 1.% dan emas (Au) 0.77 g/t. Grasberg Block Cave adalah tipe cadangan porphyry yang memiliki kadar Cu-Au tinggi dalam material stockwork dengan bentuk sepatu kuda yang dikelilingi oleh Kali Diorite. Performa uji metalurgi merupakan refleksi dari type bijih “ore” yang dibutuhkan oleh insinyur tambang untuk mendapatkan hasil yang optimal untuk metal target. Tipe bijih yang bersih akan diproduksi lebih untuk mendapatkan perolehan metal yang tinggi jika dibandingkan dengan bijih bermasalah (problematic ore). Identifikasi bijih bermasalah “problematic ore” di tambang bawah tanah Grasberg Block Cave, yang dibahas dalam makalah, diharapkan bisa berguna dalam proses penambangan. Kajian tentang bijih “bermasalah” (problematic ore) pada cadangan Grasberg Block Cave ini dilakukan untuk mengetahui karakteristik dan kontrol-kontrol mineralogi pada tipe ore ini guna mengurangi kerugian akibat berkurangnya perolehan mineral-mineral bijih berharga. Metode yang digunakan adalah pemetaan geologi dan sampling di lapangan, analisis XRD untuk sampel terpilih dari batuan inti hasil pemboran, serta analisis geo-metalurgi yang dilakukan di laboratorium. Jenis bijih yang bermasalah berdasarkan standar geo-metalurgi Freeport Indonesia, seperti halnya di tambang terbuka Grasberg, diprediksi juga terdapat di Grasberg Block Cave. Bijih ini dipengaruhi oleh mineral pengotor seperti mineral serisit-lempung>10%, pirit> 5%, dan mika> 15%. Oleh karena itu, pengamatan geologi di lapangan dikombinasikan dengan analisis laboratorium sangat penting untuk mengetahui bijih bermasalah pada cadangan tambang bawah tanah Grasberg Block Cave.
PENDIDIKAN GEOLOGI MILITER DI INDONESIA, SUATU TANTANGAN BAGI PUSDIKLAT GEOLOGI DAN PERGURUAN TINGGI PENYELENGGARA PENDIDIKAN SAINS KEBUMIAN Zufialdi Zakaria -
Bulletin of Scientific Contribution: GEOLOGY 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 | Full PDF (226.103 KB) | DOI: 10.24198/bsc geology.v8i1.8244

Abstract

Geology plays a role in various fields. In the field of military and national defense, geological branch that play a role is military geology. In Indonesia, there are no special units of military geology that handling of military geology. Military geology education was also not in the curriculum of the University of geoscience education providers. Geological training and education center is also not have modules and syllabus for military geology . These conditions is a challenge to provide military-geology education for personnel of military of Indonesian National Army , or to the geologists who are interested in working in the military
Aktivitas Tanah Lempung Pada Formasi Bojongmanik Terhadap Kestabilan Lereng di Daerah Cikopomayak, Kabupaten Bogor, Provinsi Jawa Barat Alifahmi Alifahmi; Raden Irvan Sophian; Dicky Muslim
Bulletin of Scientific Contribution: GEOLOGY Vol 14, No 3 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (964.745 KB) | DOI: 10.24198/bsc geology.v14i3.11069

Abstract

Formasi Bojongmanik merupakan formasi yang salah satu material penyusunya merupakan batulempung. Berdasarkan pemetaan geologi teknik yang telah dilakukan daerah penelitian memiliki jenis tanah lempung berplastisitas tinggi (CH) dan lanau berplastisitas tinggi (MH) menurut klasifikasi USCS (Unified Soil Clasification System).  Kondisi tanah dengan plastisitas tinggi merupakan kondisi dimana tanah dapat merubah bentuk dengan mudah akibat adanya pengaruh kenaikan kandungan air. Aktivitas mineral lempung merupakan salah satu faktor yang mengatur kestabilan lereng, dimana tanah lempung memiliki sifat dapat menyusut dan mengembang bergantung pada kadar air. Berdasarkan nilai aktivitas lempung yang diperoleh pada daerah penelitian dengan membandingkan nilai indeks plastisitas terhadap presentase kandungan lempung didapat pada lapisan bagian atas tanah (kedalaman 0.5-1m) memiliki nilai aktivitas lempung yang tinggi (>125) dengan jenis lempung Montmorilonite dan lapisan tanah bagian bawah (kedalaman 2-4m) memiliki nilai aktivitas lempung rendah (<0.75) dengan jenis mineral kaolinite hingga aktivitas lempung normal (0.75-1.25) dengan jenis mineral illite. Meskipun nilai safety factor pada daerah penelitian lebih besar dari angka stabil yang dinyatakan oleh Bowles, yaitu diatas 1.25, bahaya longsor masih memungkinkan terjadi pada saat tanah berada dalam kondisi basah, hal ini dikarenakan kandungan air dalam lempung meningkat memicu kenaikan aktivitas lempung sehingga menyebabkan kenaikan volume pada lempung. Pada peristiwa tersebut kondisi lereng akan mengalami ketidak stabilan sehingga pergerakan massa tanah terjadi untuk mencapai titik setimbang lereng tersebut. Kata kunci: kestabilan lereng, safety factor, mineral lempung, longsor
NIKEL LATERITIK DI DAERAH TANAH MERAH, TABLASUFA DAN ORMO, KABUPATEN JAYAPURA, PROPINSI PAPUA Geni Dipatunggoro -
Bulletin of Scientific Contribution: GEOLOGY Vol 5, No 3 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2063.827 KB) | DOI: 10.24198/bsc geology.v5i3.8150

Abstract

Nickel occurs in bedrock of ultramafic spread surrounding Jayapura to the west along the northeren beach of Papua, Occurs in layers of soil called Limonit and Saprolit where both are weathered of ultramafic bedrocks includes Peridotit, Harsburgit, Serpentinit, Dunit and Lerzolit.The geology of Jayapura including distribution of ultramafic and metamorphic rocks of Pra-Tersier age was uplifted to the land since the tectonic of Early Miocene to the present was subjected to some active tectonic characterized by steep and sharp morphology.From the result of previous investigations indicates that nickel grade are excellent and being prospective for industrial word especially in China. The highest obtained nickel grade reached 6 %.Fild investigation show the occurrence of DMP (Associated Minerals) in nickel area e.g. Iron (Fe), Cobalt (Co) and Chrom (Cr).
PENDUGAAN KETERDAPATAN AKIFER AIRTANAH DENGAN METODE GEOLISTRIK DI KECAMATAN SUKATANI - KABUPATEN PURWAKARTA Febriwan Mohamad; Yusi Firmansyah
Bulletin of Scientific Contribution: GEOLOGY Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (604.331 KB) | DOI: 10.24198/bsc geology.v13i3.8411

Abstract

The research area as administratively is located in Sukatani village, District Sukatani, Purwakarta, West Java Province. Based on the relief morphology, strato volcanic facies models and its lithology, geomorphology of Sukatani is strato volcanoes leg with radial drainage pattern. This area height of about 260-300 meters above sea level. Stratigraphy unit of research area is divided into two units, namely Tufic sandstones-Conglomerates, and Alluvium. The study is intended to determine the position and water resources at a certain depth below the surface and determine subsurface conditions. The study based on measurements of geoelectric method of geoelectric 1-D and 2-D configuration of Schlumberger. The results of study are in the form of rock resistivity values. They are interpreted in the cross-sectional shape and correlated with geological and hydrogeological conditions. Based on the resistivity value, distribution layer in the study area are classified into three packages, namely rock low resistivity layer (<35 ohm-meter) expected role as aquiclud layer, a layer of medium resistivity (35-100 ohm-meters) are expected to act as a layer aquifer, and a layer of high resistivity (> 100 ohm-meters) are expected to act as a layer aquifug.

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