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All Journal Bulletin of Scientific Contribution : Geology BERKALA SAINSTEK IJOG : Indonesian Journal on Geoscience Jurnal RISET Geologi dan Pertambangan Jurnal Teknologi Mineral dan Batubara Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Indonesian Journal on Geoscience Indonesian Journal on Geoscience Jurnal Teknologi Mineral dan Batubara Journal of Geosciences and Applied Geology

Yuyun Yuniardi

Departemen Geologi Terapan, FTG, Universitas Padjadjaran

Author-ID : 2694936

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics

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FASIES BATUBARA FORMASI WARUKIN BERDASARKAN ANALISIS CORE DI DAERAH SUNGAI DIDI, KECAMATAN DUSUN TIMUR, KABUPATEN BARITO TIMUR KALIMANTAN TENGAH Yuniardi, Yuyun
Bulletin of Scientific Contribution Vol 3, No 2 (2005): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Research area layed on Sungai Didi, Dusun Timur District, Barito Timur Residence, KalimantanTengah Province. The border in geographically, 1150 11’ 1,22” – 1150 12’ 35” East Longitude and 20 2’27,93” – 20 3’ 28,74” South Latitude.Geology of research area consisted of two rock units, there were sandstone unit and claystone unit.Claystone unit consisted of claystone with alternated by coal, and then sandstone unit consisted ofsandstone which have coarse grain to fine grain. Both of those units were related with WarukinFormation, where formed at fluviatil environment with Middle Miosen of age.Research area facies would have four kinds and made into the group, there were MS (massivesandstone), FS (fining upward sandstone), CL (claystone) and Co (coal). Facies model which made haveconsisted of MS facies in lowers followed with FS facies, and then CL facies and Co in uppers.Keywords : Warukin Formation, Fluviatil, Facies

DEBIT ALIRAN (WATER YIELD) SUB-DAS CIGUMENTONG DAN CIMULU SUB-DAS CITARIK BAGIAN PALING HULU Haryanto, Edi Tri; Nur, Andi Agus; Haryanto, Iyan; Yuniardi, Yuyun
Bulletin of Scientific Contribution Vol 13, No 2 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Cigumentong and Cimulu sub-watersheds are growing at vokanik denudasional landform with geological formations of undeferienciated old volcanic product consists of tuff , breccia and lava of the uppermost of Citarik Sub-Catchment . Based on the order system according to Strahlaar both river is a river -order 4 , with the land cover of relatively dense forest vegetation with an area of 552 Ha respectively and 606 Ha . This study aims to investigate the flow discharge characteristics of the two rivers by measuring daily and daily rainfall during the period 20 December 2014 through to March 2015, or for 71 days . The research result is fluctuations in flow discharge rate between the River Cigumentong and Cimulu tend to be similar . Inlfiltration coefficient of Cimulu sub-watersheed was slightly larger (0.54)than that was Cigumentong sub-watersheed (0.53), with the infiltration thickness of 695 mm for Cimulu and 577 mm for Cigumentong. Runoff coefficient Cimulu sub-watersheed is larger (0.44) than Cigumentong (0.37) .

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.

PENINGKATAN AKURASI PERHITUNGAN CADANGAN BATUBARA DI WILAYAH SEPARI - KALIMANTAN TIMUR BERDASARKAN DETEKSI KEMIRINGAN LUBANG BOR DENGAN SENSOR GYROSCOPE-ACCELEROMETER-HEADING DIJITAL Firmansyah, Gilang; Sukiyah, Emi; Yuniardi, Yuyun; Mardiana, Undang
Bulletin of Scientific Contribution Vol 14, No 1 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Penaksiran sumber daya dalam suatu proses penambangan batubara didapatkan melalui perhitungan dan analisis data eksplorasi detil. Data ini diperoleh dengan metode pemboran dan pemetaan geologi. Penaksiran sumber daya dilakukan untuk mengetahui taksiran jumlah tonase sumber daya batubara. Hasil taksiran selanjutnya digunakan untuk perhitungan stripping ratio pada lahan tersebut untuk mengetahui keekonomian bahan tambang. Hasil yang diperoleh dapat menentukan kelayakan suatu tambang untuk di eksploitasi. Pada proses pengeboran terdapat istilah borehole deviation, yaitu deviasi atau simpangan miring dari suatu target lubang bor. Selama ini, pengeboran tegak lurus selalu dinyatakan memiliki kemiringan 90°. Asumsi tersebut sebenarnya tidak tepat. Kemiringan lubang bor yang dinyatakan tegak lurus ternyata memiliki nilai bervariasi. Oleh karena itu, survei kemiringan lubang bor perlu dilakukan untuk mengetahui kemiringian lubang bor secara akurat. Nilai dip dan azimut lubang bor turut berperan sebagai parameter penting dalam meningkatkan akurasi perhitungan cadangan. Berdasarkan hasil uji coba terhadap penggunaan sensor gyroscope-accelerometer-heading dijital pada pengeboran eksplorasi di wilayah Separi diperoleh adanya peningkatan hasil perhitungan cadangan batubara.

GEOMETRI AKUIFER BERDASARKAN DATA GEOLISTRIK DAN SUMUR PEMBORAN DI DAERAH JASINGA, KECAMATAN JASINGA, KABUPATEN BOGOR, JAWA BARAT Mohammad, Febriwan; Mardiana, Undang; Yuniardi, Yuyun; Alfadli, Muhammad Kurniawan
Bulletin of Scientific Contribution Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

SARI Daerah penelitian secara geografis terletak pada 106° 26’ 45” BT sampai 106° 29’ 15” BT dan -6° 26’ 00” LS sampai -6° 28’ 30” LS. Secara administratif daerah penelitian berada di Desa Cikopomayak dan sekitarnya, Kecamatan Jasinga, Kabupaten Bogor, Provinsi Jawa Barat. Daerah penelitian terbagi menjadi 2 satuan batuan yaitu Satuan Batulanau dan Intrusi Andesit. Pengukuran geolistrik dan sumur pemboran digunakan untuk mengetahui kondisi geologi bawah permukaan secara vertikal maupun lateral. Daerah penelitian memiliki tiga kelompok nilai resistivitas dan litologi, yaitu batuan dengan nilai resistivitas rendah (0 – 60 Ω.m) dengan litologi batulempung – serpih dan batulanau, resistivitas menengah (61 – 130 Ω.m) dengan litologi batulempung pasiran, batupasir sedang, dan batupasir kasar, dan resistivitas tinggi (131 – 180 Ω.m) dengan litologi batupasir halus, batulempung pasiran, dan andesit. Keberadaan lapisan akuifer dibuktikan dengan adanya lapisan batupasir sedang – batupasir kasar pada kedalaman 10 dan kedalaman 20 meter dari sumur pemboran. Dari korelasi data geolistrik dan sumur pemboran, dibuat penampang sistem akuifer yang melewati daerah penelitian yang selanjutnya di modelkan ke dalam diagram pagar geometri akuifer. Berdasarkan model geometri akuifer, daerah penelitian terbagi menjadi tiga jenis akuifer yaitu, akuifer bebas, akuifer semi tertekan, dan akuifer tertekan.Kata Kunci : geolistrik, sumur pemboran, geometri akuifer. ABSTRACTThe research area is geographically located at 106° 26’ 45” East up to 106° 29’ 15” East and 6° 26’ 00” South up to 6° 28’ 30” South. Administratively, area of research is in the Cikopomayak, Jasinga, Bogor District, West Java Province. The research area is divided into two rock units, Siltstone Unit and Andesite Intrusion. Georesistivity method and well drilling used to study subsurface geology. The research area have three kind of resistivity and lithology value, that is low resistivity (0 – 60 Ω.m) with shale and siltstone lithology, medium resistivity (61 – 130 Ω.m) with sandy clay and sandstone lithology, and high resistivity (131 – 180 Ω.m) with sandstone, sandy clay, and andesit lithology. Presence of aquifer layer proved by sandstone in well drilling at depth of 10 – 20 meters. From the georesistivity and well drilling data correlation, made a cross section of aquifer system in the research area, then modelled to fence diagram. According to geometric model of aquifer, the research area divided to three aquifer configurations, unconfined aquifer, semi confined aquifer, and confined aquifer.Keyword : resistivity, geometry aquifer

Interpretasi Kondisi Geologi Bawah Permukaan Berdasarkan Data Geofisika Magnetotellurik Daerah Blora, Provinsi Jawa Tengah YUNIARDI, YUYUN; Mardiana, Undang; Nur, Andi Agus; Mohammad, Febriwan; Alfadli, Muhammad Kurniawan
Bulletin of Scientific Contribution Vol 19, No 3 (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.v19i3.37879

Daerah penelitian berada di Kabupaten Blora, Jawa Tengah, termasuk kedalam zona Rembang Cekungan Jawa Timur bagian Utara, dan tersusun lima Formasi yaitu; Formasi Tambakromo, Formasi Selorejo, Formasi Mundu, Formasi Ledok, Formasi Wonocolo, namun penentuan batas-batas Formasi pada daerah penelitian belum ada yang dapat menjelaskan dan gambaran struktur bawah permukaan masih kurang, oleh karena itu penelitian ini bertujuan untuk memberikan informasi tambahan mengenai penentukan batas-batas formasi serta stuktur geologi bawah permukaan yang akan diperoleh dari hasil interpretasi korelasi data lapangan dengan menggunakan metoda geofisika Magnetotellurik. Hasil Pengukuran Magnetotellurik pada 40 titik, berdasarkan nilai resistiviti terdapat 5 zona keterpengaruhan struktur, yaitu: zona 1, pada titik pengukuran 35-36; zona 2, pada titik pengukuran 27-33; zona 3 pada titik pengukuran 16-17; zona 4 pada titik pengukuran 9-10; dan zona 5 pada titik pengukuran1-2 permodelan berdasarkan nilai-nilai resisitiviti berdasarkan kedalaman, terdapat 5 batasformasi, yaitu: 1)Formasi Wonocolo, Ledok, Mundu, Selorejo, Tambakromo dan Alluvium, 2) Formasi Wonocolo dan Ngrayong, 3) Formasi Tuban, 4) Formasi Kujung, dan 5) Formasi Ngimbang dan Batuan dasar. Struktur Geologi yang berkembang berupa lipatan, antiklin pada titik 26-36, dan titik 02, sinklin di tengah titik-titik pengukuran, Sesar Normal yang bersifat tumbuh pada titik antara MT26-MT27dan pada titik 30, yang masuk kedalam zona struktur 2, dan sesar normal pada titik MT 09 masuk kedalam zona 02. Sesar Naik pada titik MT 02 pada zona 05.

PETROLOGI DAN PETROGRAFI SATUAN BREKSI VULKANIK DAN SATUAN TUF KASAR PADA FORMASI JAMPANG, DAERAH CIMANGGU DAN SEKITARNYA, JAWA BARAT Verdiana, Puteri Rasdita M.; Yuniardi, Yuyun; Nur, Andi Agus
Bulletin of Scientific Contribution Vol 12, No 3 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

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.

Potensi Airtanah Berdasarkan Nilai Resistivitas Batuan di Kelurahan Cangkorah, Kecamatan Batujajar, Kabupaten Bandung Barat Mohammad, Febriwan; Mardiana, Undang; Yuniardi, Yuyun; Firmansyah, Yusi; Alfadli, Muhammad Kurniawan
Bulletin of Scientific Contribution Vol 14, No 2 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Groundwater is water that contain under the soil or rock which located in subsurface layer. The resistivity method or geoelectricity using electrical properties of subsurface materials to obtain the anomalies. Aquisition data did with 2 line of 2-D resistivity and 10 point of 1-D resistivity. The result from 1-D resistivity are divided into three classification : First classification had range between 1 – 5 Wm which indicate the rock with low resistivity and shallow. This layer interpretated as clay from Saguling Lake sedimentation and this layer act as aquiklud layer. The second classification with range between 6 – 20 Wm indicated as medium resistivity and act as aquitard. The third classification with range more than 20 Wm indicated as high resistivity and act as aquifer with low productivity. From the 2-D resistivity survey, such as : Low resistivity range assosiated with shaly tuff lithology and sandy tuff, depth of the low resistivity range about 0 – 40 meters, Medium resistivity range had depth about 10 – 70 meters, act as aquifer due to have well porosity properties. High resistivity range depth is more than 70 meters until 100 meters assosiated with massif layer, bad porosity, and did not have rock pore, the lithology is collaboration between massif breccia with igneous component. Keyword : Geoelectricity, Resistivity, Batujajar, Groundwater, Aquifer Air tanah merupakan air yang terdapat di dalam lapisan tanah atau batuan yang terletak di bawah permukaan tanah. Metode resistivitas (resistivity) atau geolistrik memanfaatkan sifat kelistrikan material bawah permukaan untuk mendapatkan anomali. Pengukuran dilakukan sebanyak 2 lintasan geolistrik 2-D dan 10 titik pengukuran 1-D. Dari hasil pengukuran metode 1-D diperoleh 3 paket batuan yaitu : Paket lapisan batuan 1 dengan nilai tahanan jenis berkisar antara 1 – 5 Wm yang mengindikasikan batuan dengan resistivitas amat rendah dan dangkal. Lapisan ini diduga berupa lempung dari endapan danau Saguling. Lapisan ini diduga berperan sebagai akiklud. Paket lapisan batuan 2 dengan nilai tahanan jenis antara 6 hingga 20 Wm mengindikasikan batuan dengan resistivitas menengah dan bersifat sebagai akitar . Paket lapisan batuan 3 dengan nilai tahanan jenis antara lebih dari 20 Wm mengindikasikan batuan dengan resistivitas yang tinggi dan dapat berperan sebagai akifer dengan produktivitas rendah. Dan dari hasil geolistrik 2-D, yaitu : Rentang resisitivitas rendah kemungkinan berasosiasi dengan batuan dengan litologi tuf lempungan dan tuf pasiran memiliki kedalaman bervariasi antara 0-40 meter, Rentang resistivitas menengah memiliki kedalaman bervariasi sekitar 10-70 meter. Porositas paket batuan ini diperkirakan baik, dan dapat berperan sebagai akifer, Rentang resisitivitas tinggi ini berasosiasi dengan rentang kedalaman yang bervariasi mulai dari 70 meter hingga kedalaman lebih dari 100 meter berasosiasi dengan Lapisan keras, massif, porositas buruk dan tidak dapat menyimpan air di antara pori-pori batuannya, berupa perpaduan antara breksi padu dengan komponen batuan beku. Kata kunci : Geolistrik, Resistivitas, Batujajar, Airtanah, Akifer

DEPOSITIONAL ENVINRONMENT AND PALEOCURRENT THE MIDDLE OF WARUKIN FORMATION BASED ON SEISMIC AND WELL LOG DATA IN NORTH-EAST PART BARITO BASIN, SOUTH KALIMANTAN Yuniardi, Yuyun; Mardiana, Undang; Mohammad, Febriwan; Nur, Andi Agus; Alfadli, Muhammad Kurniawan
Bulletin of Scientific Contribution Vol 18, No 3 (2020): 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.v18i3.31550

Explorations in the Barito basin has started nearly 100 years and was marked by the discoveryof the Tanjung Field in 1938 (Maso at all 1993). The middle of Warukin Formation is one of thereservoir formation in the Barito basin of North-Northeast. Barito Basin is located betweenSundaland in the west and Meratus in the east (Satyana, Awang.1994). An understanding of thedepositional environment and paleo-current will be very useful for the exploration and fielddevelopment optimization of oil and gas. The data used in this researcher seismic 3D data and well data. From the existing data createdseismic facies maps and correlation maps well with the markers used datum is the Top FormationMiddle Warukin. Downlap termination pattern found on the seismic line 75H - 37 at the lower limit indicates thetime of formation of this facies occur sea level rise. Configuring the parallel reflection pattern -subparallel and divergent indicate the depositional environment is shelf / platform or deltaplatform (Serra, O, 1990). Coarsening upward to fining upward pattern relatively evolved fromwireline log analysis, in which a pattern is formed on the shore face transgressive delta thenserrated pattern formed in the shelf. Based on the seismic data and log data as well as supportingdata from the regional geology of the Barito Basin, it can be interpreted that the study area isformed on the delta depositional environment - shelf. Paleo-current study area can be determined based on seismic facies maps and regionalconditions Barito Basin. Of seismic facies maps can be interpreted Paleo-current direction isrelative to the south - west with relative sediment supply from the north - east.

KARAKTERISTIK ENDAPAN VULKANIK SUB DAS CIGOMBONG LERENG TIMUR GUNUNG SALAK MUTAQIN, DEDEN ZAENUDIN; Mohammad, Febriwan; Mardiana, Undang; Yuniardi, Yuyun; Alfadli, Muhammad Kurniawan
Bulletin of Scientific Contribution Vol 17, No 2 (2019): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRAKMetode stratigrafi yang digunakan pada batuan vulkanik serupa dengan mempelajari stratigrafi pada batuan sedimen, yaitu membuat korelasi, urutan secara vertikal berdasarkan waktu, menentuakan perubahan fasies dan sejenisnya. Penelitian Stratigrafi rinci mengenai daerah vulkanik masih jarang dilakukan. Hal ini biasanya dikarenakan oleh kondisi lapangan yang sulit ditempuh. Penelitian ini berlokasi di Sub DAS Cigombong Lereng Timur Gunung Salak untuk mengetahui perubahan litologi baik secara lateral maupun vertikal. Permasalahan dipecahan dengan Observasi lapangan. Data lapangan berupa lintasan-lintasan stratigrafi berdasarkan daerah cekungan pengaliran. Berdasarkan fasies vulknik dari keseluruhan analisis , terdapat 6 kelompok fasies dari muda ke tua yaitu endpan aliran laharik gunung salak, endapan aliran lava 2 gunung salak, endapan aliran lava 1 gunung salak, endapan aliran piroklastik scoria 3 gunung salak endapan aliran lava 1 gunung salak, endapan aliran piroklastik scoria 2 berasosiasi dengan endapan Seruakan gunung salak, dan endapan aliran lava 1 gunung salak, endapan aliran piroklastik scoria 1 pra gunung salak.Kata kunci: Cigombong, Fasies Gunung Api, Salak, VulkanikABSTRACTStratigraphy in volcanic area have similar treatment with sedimentary rock study process, i.e. make correlations, order vertically based on time, determine changes in facies and the like. Detailed stratigraphic research on volcanic areas is rarely done. This is usually caused by field conditions that are difficult to go through. This research is located in the Cigombong East Slope Sub-watershed of Mount Salak to determine lithological changes both laterally and vertically. The problem is solved by field observations. Field data in the form of stratigraphic trajectories based on drainage basins. Based on the Vulcanic facies of the whole analysis, there are 6 facies groups from young to old, namely Salak mountain flow depletions, Salak flow 2, Salak flow 1, pyroclastic flow, scoria 3 Salak mountain deposition, lava flow 1 Salak mountain, scoria pyroclastic flow sediment 2 associated with Salak mountain excavation, Salak mountain lava flow 1, pyroclastic flow precipitate 1 Salak mountain.Keyword: Cigombong, Volcanic Facies, Mt. Salak, Volcanic.

Co-Authors Abdurrokhim ⠀ Abdurrokhim, . Adi Hardiyono, Adi Alfadli, Muhammad Kuniawan Andi Agus Nur, Andi Agus Aruan, Immanuel Hareanto Asep Bahtiar Purnama, Asep Bahtiar Budi Muljana Edi Tri Haryanto, Edi Tri Emi Sukiyah Febriwan Mohamad, Febriwan Febriwan Mohammad Febriwan Mohammad, Febriwan Fikri Abdullah, Fikri Gilang Firmansyah, Gilang Hendarmawan Hendarmawan Hendarmawan, . Iyan Haryanto, Iyan Khoirullah, Nur Muhammad Kurniawan Alfadli Mutaqin, Deden Zaenudin Nanda Natasia Nurdrajat Nurdrajat Panji Ridwan Puteri Rasdita M. Verdiana, Puteri Rasdita M. Raden Irvan Sophian, Raden Irvan Ridwan, Panji Sendjaja, Yoga A. Silti Salinita, Silti Undang Mardiana Vijaya Isnaniawardhani Yusi Firmansyah, Yusi

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