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Lithofacies And Depositional Environment Of Halang Formation On Part Of Cihikeu River Section, Majalengka, North Java Wijaya, Eric; Abdurrokhim, .; Helmi, Faisal; Ilmi, Nisa Nurul; Sunardi, Edy
Journal of Geological Sciences and Applied Geology Vol 2, No 1 (2017): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v2i1.13423

AbstractThis study about lithofacies and depositional environment is located at Cihikeu River, Village Area of Mekarwangi Village, Bantarujeg District, Majalengka, West Java. Geographically, the research area is located at 60 56’ 11,7” latitude and 60 57’ 09,3” latitude and 1080 11’ 22,3” BT until 1080 12’ 20,3” BT. Based on Arjawinangun Geological Map (Djuri, 1995), the research area is located at Upper Parts of Halang Formation. This research show that the lithology that dominantly occur in the research area is sandstones, mudstones, and breccia.The methods that been used in this research are stratigraphics cross section measurements, lithofacies analysis, and based on secondary data which is paleontology analysis, it can be concluded that there are 8 lithofacies refers to the submarine facies classification by Stow, 1985 that occur in research area, which are facies A1-1, facies A1-3, facies B1-1, facies C2-2, facies C2-3, facies E1-1, facies E2-1, and facies F2-2. Based on the secondary data, the age of research area can be concluded into middle miocene to late miocene.Based on the lithofacies analysis, the lithofacies association concluded into 3 lithofacies association, which are FA-1, FA-2, and FA-3. From those lithofacies associaton characteristics, thereafter the depositional environment can be interpretated into 4 sub-depositional environments which are lower slope, upper fan, middle fan, and lower fan that refers to submarine depositional environments classification by Walker, 1984. Keywords : Lithofacies, Lithofacies association, Depositional environments, Submarine fan

Lithofacies of the Halang Formation in the Cijurey River-Majalengka Abdurrokhim, .; Firmansyah, Yusi; Natasia, Nanda; Saputra, Mulyana
Journal of Geological Sciences and Applied Geology Vol 2, No 3 (2017): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v2i3.15614

This report discusses lithofacies composition of the upper part Halang Formation that is well exposed along the Cijurey River, Majalengka - West Java. A total of 450-m-thick continues section of the Halang Formation have been measured and described. The lithofacies composition of the Halang Formation in the Cijurey River consists of alternating thin- to very thin-bedded sandstones and mudstone, un-bedded mudstones, very thick pebbly mudstones, breccia and slump. Andesitic igneous rock intruded locally to this formation.

CARBONATE REEF OF THE KLAPANUNGGAL FORMATION IN THE BOGOR TROUGH, WEST JAVA Abdurrokhim, .
Journal of Geological Sciences and Applied Geology Vol 2, No 1 (2017): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v2i1.13422

AbstractThe Late Miocene shelf-margin carbonate reef is well exposed in the study area, and named as Klapanunggal Formation. The formation is characterized mainly by thick and massive reefal limestone with large foraminifers and other types of shell fragments, such as mollusks and echinoderms, and it have been developed in a response to the decrease in sediment discharge superimposed by relative rise in sea level during the late Miocene. Keyword: carbonate, Klapanunggal Formation, rimmed reef, shelf margin, Bogor Trough

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

STRATIGRAFI VULKANIK DI LERENG UTARA GUNUNG TANGKUBAN PARAHU, DAERAH CISALAK, KABUPATEN SUBANG, PROVINSI JAWA BARAT Yuniardi, Yuyun; Hendarmawan, .; Isnaniawardhani, Vijaya; Abdurrokhim, .; Ridwan, Panji
Bulletin of Scientific Contribution Vol 17, No 3 (2019): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

AbstrakGunung Tangkuban Parahu adalah gunung api aktif di Provinsi Jawa Barat yang merupakan fase termuda dari kelanjutan sistem vulkanisme Sunda-Tangkuban Parahu yang memiliki sejarah geologi yang cukup rumit dan komplek, khususnya daerah Cisalak dan sekitarnaya, Kabupaten Subang. Metode Fasies Gunungapi dapat digunakan untuk merekonstruksi peristiwa erupsi yang terjadi masa lampau dan juga dapat digunakan untuk memprediksi arah aliran apabila terjadi erupsi berikutnya. Stratigrafi vulkanik daerah penelitian dapat dibagi menjadi enam satuan yang diurutkan dari muda ke tua, yaitu: Aliran Piroklastik 1 Bukittunggul (Ba1) Holosen; Jatuhan Piroklastik Tangkuban Parahu (Tj) Holosen; Aliran Piroklastik Tangkuban Parahu (Ta) Holosen; Aliran Piroklastik 2 Bukittunggul (Ba2) Plistosen awal; Aliran Lava Bukittunggul (Bl) Plistosen awal; dan Aliran Lava Sunda (Sl) Plistosen tengah. Setelah dilakukan analisis fasies diperoleh fasies dengan endapan paling muda yang memiliki material berupa konglomerat dan fasies debris flow, pada fase selanjutnya didapatkan fasies endapan jatuhan piroklastik, kemudian dilanjutkan dengan fasies aliran prioklastik atau ignimbrit, dan fasies berikutnya adalah berupa block dan ash deposit, serta fasies terakhir dengan meterial tertua yang berlitologikan lava adalah fasies lava koheren. Dampak erupsi berupa aliran lahar, awan panas, dan material jatuhan yang terjadi di masa lalu masih sangat mungkin terjadi pada masa yang akan datang. Katakunci: Tangkuban Parahu, Fasies Gunungapi, Erupsi. AbstractTangkuban Parahu Volcano is an active volcano in West Java Province which is the youngest phase of the continuation of the Sunda-Tangkuban Parahu volcanism system which has a fairly complex and complex geological history, especially the Cisalak and surrounding areas, Subang Regency. The Volcanic Facies Method can be used to reconstruct eruption events that have occurred in the past and can also be used to predict the direction of flow when the next eruption occurs. The volcanic stratigraphy of the study area can be divided into six units which are sorted from young to old, namely: Pyroclastic Flow 1 Bukittunggul (Ba1) Holocene; Holocene Tangkuban Parahu (Tj) Pyroclastic Fall; Pyroclastic Flow Tangkuban Parahu (Ta) Holocene; Bukittunggul 2 Pyroclastic Flow (Ba2) Early Plistocene; Bukittunggul Lava Flow (Bl) Early Plistocene; and Sunda Lava Flow (SL) Middle Plistocene. After facies analysis, facies was obtained with the youngest sediment which had material in the form of conglomerates and debris flow facies, in the next phase obtained facies of pyroclastic fall deposits, then proceed with prioclastic flow facies or ignimbrite, and the next facies were blocks and ash deposits, and facies the last with the oldest meterial lava is the coherent lava facies. The impact of the eruption in the form of lava flow, hot clouds, and falling material that occurred in the past is still very likely to occur in the future. Keywords: Tangkuban Parahu, Volcano Facies, Eruption.

THE VOLCANIC DEPOSIT WEATHERED PRODUCT IN JATINANGOR AREA, WEST JAVA Sophian, Raden Irvan; Abdurrokhim, .; Haryanto, Iyan; Hendarmawan, .
Bulletin of Scientific Contribution Vol 15, No 2 (2017): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRAKPembangunan di Kawasan Jatinangor dalam beberapa waktu ini telah mengalami perkembangan yang cukup pesat. Jatinangor adalah daerah baru yang dikembangkan untuk Pendidikan dari beberapa kampus seperti Unpad, ITB, IKOPIN, dan IPDN. Hal ini menyebabkan peningkatan jumlah penduduk tiap tahunnya dan juga menyebabkan berkembangnya infrastruktur untuk mendukung kegiatan Pendidikan di daerah ini. Untuk mengetahui hambatan dan menghindari terjadinya bencana alam di masa depan, maka harus dipahami perilaku tanah permukaan sebagai pondasi bangunan berbagai sarana prasarana. Metode penelitian meliputi pemetaan geologi teknik, pengambilan sampel tanah tidak terganggu, uji tes pit, analisis sifat petrologi atau batuan. Kondisi Geologi daerah ini terdiri dari produk vulkanik muda yang tidak terpisahhkan, yang terdiri dari breksi tufan, tuf, lahar, tuf lapilli, dan abu vulkanik yang berumur kuarter (kurang dari 2 Ma). Kondisi geomorfologi daerah ini terdiri dari dataran hingga perbukitan landai di selatan Gn. Manglayang. Berdasarkan hasil penelitian, kawasan Jatinangor memiliki distribusi tanah terdiri dari lanau hingga lempung berplastisitas tinggi (MH dan CH). Kondisi ini menyiratkan produk vulkanik yang tidak terkonsolidasi dan tanah residu semi-konsolidasi sebagai produk pelapukan dari ash dan alterasi dari tuff. Kata Kunci: Jatinangor, Sifat Fisik Tanah, Tuff, Material Vulkanik Muda belum Terpisahkan ABSTRACTThe development of jatinangor area in recent time has experienced a very rapid development. Jatinangor is the new location for Education area from several campuses such as Unpad, ITB, IKOPIN, and IPDN. This results in an increase in the number of population each year and also led to a growing development of infrastructure to support educational activities in this area. To know the obstacles and avoid the occurrence of natural disasters in the future, it should be understood the behavior of surface soil as the building foundation of various infrastructure facilities. The research method includes engineering geologic mapping, undisturbed soil sampling, test pit, petrologic or rock properties analysis. The geology of this area consists of undifferentiated young volcanic product (Qyu), containing tuffaceous breccia, tuff, lava, lapilli tuff, and volcanic ash. This product is deposited on Quaternary geologic age (less than 2 Ma). The geomorphology of this area consists of plain to hilly land at the south of Mount Manglayang. Result of this study shows that around Jatinangor area the distribution of soils consists of high plasticity silt and clay (MH and CH). This condition implies to semiconsolidated-nonconsolidated volcanic product and semi-consolidated residual soil as the weathering product of ash and tuff alterations. Keywords: Jatinangor, physical properties soil, tuff, undifferentiated young volcanic product

Stratigrafi Sikuen Formasi Jatiluhur di Cekungan Bogor, Jawa Barat Abdurrokhim, .
Bulletin of Scientific Contribution Vol 15, No 2 (2017): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRACTThe Jatiluhur Formation that exposed in the northern part of the Bogor Trough consists of a mixture of carbonate and siliciclastic sedimentary rocks. The very well outcrops are exposed in some parts of the Cipamingkis and Cileungsi Rivers, about 20 km to the northeast from Bogor City. The formation is characterized by mudstone dominated facies that consist of interlaminated siltstones, claystone and thin-bedded sandstones, and locally interbedded with thick-bedded sandstone, thick-bedded limestone, slump deposits, slump scar-fill deposits and channel-fill deposits.Thick-bedded sandstones and slump deposits common found in the lower part of succession, while carbonate intervals are developed in the middle and upper part of the formation. The formation is interpreted to have been developed during middle–late Miocene in slope and shelf margin settings.Overall the succession that exposed in both the rivers represent shallowing upward of the formation, which where overlain, in turn, by a deeper succession in the middle part, as a response of single relative sea level fall and rise.Keyword: Jatiluhur, Stratigraphy, Thick-bedded, sequenceABSTRAKSingkapan Formasi Jatiluhur di bagian utara Cekungan Bogor (utamanya pada Sungai Cipamingkis dan Sungai Cileungsi, Bogor) memberikan kesempatan untuk meneliti urut-urutan batuan ini. Formasi Jatiluhur pada daerah penelitian ini disusun oleh batulempung dan batulanau dengan sisipan tipis batupasir halus sampai sedang. Pada beberapa interval juga bersisipan dengan batupasir tebal sampai sangat tebal, batugamping tebal sampai sangat tebal, endapan slump, endapan pengisi slump-scar dan endapan channel.Sisipan batupasir tebal sampai sangat tebal, endapan slump, endapan pengisi slump-scar dan endapan channel umumnya dijumpai di bagian bawah formasi ini. Sedangkan sisipan batugamping dijumpai di bagian tengah formasi, yang kemudian ditutup kembali dengan perselingan batulempung, batulanau dan lapisan tipis batupasir pada lingkungan yang lebih dalam.Secara keseluruhan Formasi Jatiluhur dicirikan dengan urut-urutan litologi yang mendangkal ke atas, yang kemudian berubah kembali secara gradual mendalam, sebagai respon dari perubahan turun dan naiknya relative permukaan air laut (fall and rise of relative sea level)Kata kunci: Jatiluhur, stratigrafi, Tebal sisipan, sekuen

ZONASI ANOMALI UNSUR GEOKIMIA DI WEDA, KABUPATEN HALMAHERA TENGAH, MALUKU UTARA BERDASARKAN DATA UNIVARIAT DAN MULTIVARIAT Fadhly, Ahmad; Syafri, Ildrem; Abdurrokhim, .
Bulletin of Scientific Contribution Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRACTThe research area is located in the Weda Region, Central Halmahera Regency, is a path of metal mineralization which belongs to the Halmahera magmatic arc. The study area has a coverage area of 10 km x 15 km. The purpose of this study is to reveal the availability of major elements content (Cu, Pb, Zn, Co, Ni, Mn, Ag, Li, K, Fe, Cr and Au) on river deposits in the form of maps of the major elements content. Geochemical data collection is done on intermittent river. The identification of the metal content of the samples taken was done in the PSMBP geochemistry laboratory using the Atomotic Absorbtion Spectrometry Logametri (AAS) method. A total of 12 elements have been analyzed for the levels in the highest samples of stream sediment and treated to obtain anomaly zone. In this case SPSS 21.0 software is used for identification anomaly based on the correlation value between elements, then the research area there are two elemental associations that have kinship in accordance with univariate statistics, multivariate with factor analysis test. The two elemental association elements: 1) Ni-Co-Li-K-Cr. The formation of Factor 1 shows a strong relationship between Ni as well as the associations Co, Li, K and Cr associated with the regional geological conditions of the study area, which is occupied by rock dominance mafic rock and ultramafiic rock. 2) Cu-Zn-Mn-Ag-Fe. The formation of Factor 2 was obtained based on the incorporation of geochemical data analysis results reflected from elemental associations in the surface environment of the Sulfide Ore Complex. The existence of this mineral is closely related to hydrothermal alteration. Keywords: Geochemistry, mineralization, Atomotic Absorbtion Spectrometry Logametri (AAS) method. ABSTRAKDaerah penelitian terletak di Daerah Weda, Kabupaten Halmahera Tengah, merupakan jalur mineralisasi logam yang termasuk ke dalam Halmahera magmatic arc, dan mempunyai cakupan wilayah 10 km x 15 km. Tujuan dari penelitian ini adalah untuk mengungkapkan keterdapatan kandungan unsur logam (Cu, Pb, Zn, Co, Ni, Mn, Ag, Li, K, Fe, Cr dan Au) pada endapan sungai dalam bentuk peta kandungan unsur logam tersebut. Pengambilan data geokimia dilakukan pada sungai intermitten. Identifikasi kandungan unsur logam dari contoh yang diambil dilakukan di laboratorium geokimia PSMBP menggunakan metoda Atomotic Absorbtion Spectrometri Logametri (AAS). Sebanyak 12 unsur telah dianalisis kadarnya di dalam percontohan sedimen sungai dengan kadar yang tertinggi dan diolah untuk mendapatkan zona anomalinya. Dalam hal ini software SPSS 21.0 dipakai untuk penentuan anomalinya berdasarkan nilai korelasi antar unsur, maka di daerah penelitian terdapat dua asosiasi unsur yang memiliki kekerabatan sesuai dengan data statistik univariat, multivariat dengan uji analisis faktor. Kedua asosiasi kekerabatan unsur tersebut adalah: 1) Ni- Co -Li-K-Cr, Pembentukan Faktor 1 memperlihatkan adanya hubungan yang kuat antara Ni serta asosiasi Co, Li, K dan Cr yang dikaitkan dengan kondisi geologi regional daerah penelitian, yaitu ditempati oleh dominasi batuan beku basa dan ultrabasa. 2) Cu-Zn-Mn-Ag-Fe. Pembentukan Faktor 2 didapat berdasarkan penggabungan hasil analisis data geokimia yang tercerminkan dari asosiasi unsur di lingkungan permukaan Komplek Bijih Sulfida. Keberadaan mineral ini erat kaitannya dengan alterasi hidrotermal. Kata Kunci: Geokimia, mineralisasi, metoda Atomotic Absorbtion Spectrometri Logametri (AAS).

Mapping Channel Distribution Based on Seismic and Well Data in West Natuna Ikramina, Alma; Haryanto, Iyan; Abdurrokhim, .
Bulletin of Scientific Contribution Vol 19, No 2 (2021): Bulletins of Scientific Contribution : Geology
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v19i2.34719

Natuna is one of the regions in Indonesia that has potential in hydrocarbon with a siliciclastic reservoir which is generally characterized by a fluvial and deltaic environment. For this reason, it is important to identify the distribution channel to find out the distribution of the reservoir. This study using the well-logging and 3D seismic data interpretation methods. With the correlation between the horizon slicing method on seimsic data, lithology identification in well data, and also using seismic attributes, we can determine the distribution of reservoirs. In reseach area, reservoir distribution analysis in Arang and Muda Formation. Where Arang Formation identified 4 reservoirs, which 3 of them have oil content, with effective porosity value of 10-30%. Meanwhile, in Muda Formation, there are 3 reservoirs with effective porosity of Muda Formation is 20-27%

Dolomitisasi Batugamping Formasi Klapanunggal Cekungan Bogor, Jawa Barat Hafiz, Surya Darma; Abdurrokhim, .; Haryanto, Iyan
Bulletin of Scientific Contribution 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 (290.44 KB)

Paper ini menjelaskan tentang dolomitisasi dari batuan karbonat Formasi Klapanunggal yang berumur Miosen akhir. Formasi Klapanunggal merupakan ekuivalen dengan Formasi Parigi yang berada di cekungan Jawa Barat Utara, yang terbukti sebagai salah satu penghasil reservoir hidrokarbon. Tujuh belas sampel yang sistematik (dengan rentang 10-20 m) telah di seleksi dan disiapkan untuk pengujian metode dengan menggunakan cairan blue-dye dan alizarin red, untuk mengidentifikasi porositas dan mineral dolomit. Baik porositas maupun mineral dolomit cenderung meningkat semakin kearah atas dari lintasan. Hal ini di duga di sebabkan oleh adanya peningkatan presipitasi pada batugamping yang menyebabkan adanya proses pelarutan dan dolomitisasi. Kata Kunci : Dolomit, Karbonat, Diagenesa, Formasi Klapanunggal, Jawa Barat

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