Foraminifera live from shallow marine into deep marine. Environment itself has their own characteristic of foraminifera. Indonesia which is an archipelago country has highly foraminifer’s diversity. Research area is located in Jepara Water and is a part of Java Sea. Geographically, core-01 is lied on 05055’18.66” Latitudes and 110042’34.55” Longitudes. This research is done in order to know the diversity of recent small benthic foraminifera , so that, is there an environmental changes of core-01. Quantitative method is used on 12 sample sediment below sea floor with interval depth 50.00 – 50.55 meter. The identified recent small benthonic foraminifera are compound of 43 genera and 73 species. Based on research, there are changes of diversity genera, diversity species, and individual numbers of recent small benthic foraminifera. Those changes can be used as an indicator of vertically core-01 environmental changes.

ABSTRAKStruktur geologi di Pulau Sumatra dilatarbelakangi oleh tumbukan lempeng miring antara Lempeng India-Australia dengan Lempeng Eurasia. Peristiwa tektonik ini menyebabkan terjadinya tegasan strike slip sehingga pola struktur yang terbentuk di pulau ini didominasi oleh sesar mendatar dan dua diantaranya bersifat regional yaitu Sesar Sumatra dan Sesar Mentawai. Berdasarkan latar belakang tektonik di atas, maka setiap struktur sesar yang memiliki pola yang sama dengan  kedua sesar regional di atas, selalu disimpulkan sebagai sesar mendatar juga.Data lapangan menunjukan tidak semua struktur sesar naik berada di dalam zona transpresional dari mendatar regional yang melengkung (bend fault) atau bergeser (steep over) seperti yang terjadi di daerah Bukit Garba, yaitu sesar-sesar naiknya terbentuk langsung oleh tektonik kompresi. Tektonik kompresi juga terjadi di daerah tinggian seperti prisma akresi  dan jalur orogenesa yang pembentukannya memerlukan gaya yang besar dan bersifat regional. Secara genetik peristiwa tektonik harus dilatarbelakangi oleh sistem tegasan kompresi dibandingkan strike slip. Namun demikian karena latar belakang tumbukan lempengnya bersifat miring, maka sebagian dari sesar-sesar naik di Pulau Sumatra bersifat oblik yaitu naik mendatar.Kata Kunci: bend fault, orogenesa, pop-up, strike slip, steep over, subduksi miring. ABSTRACTThe geological structure of Sumatra Island is constructed by the oblique collision of the Indo-Australian Plate with the Eurasian Plate. This tectonic occurrence induces strike-slip stresses, resulting in a structural pattern predominantly characterised by strike-slip faults, among which two are regional: the Sumatra Fault and the Mentawai Fault. Based on the aforementioned tectonic context, any fault structure exhibiting a similar pattern to these two regional faults is typically classified as a strike-slip fault.Field observations reveal that not all thrust fault structures are situated within transpressional zones of regionally curved (bend faults) or steepened (steep-over) faults, as observed in the Garba Hills area. These thrust faults are directly formed by compressional tectonics. Compressional tectonics are also active in areas of high elevation, such as accretionary prisms and orogenic zones, whose formation necessitates substantial forces and is of regional extent. Tectonic events, in a genetic sense, are primarily driven by a compressional stress system rather than strike-slip mechanisms. Nevertheless, due to the inclined nature of the plate collision background, some thrust faults on Sumatra Island are oblique, rising horizontally.Keywords: bend fault, orogenesis, pop-up, strike slip, steep over, oblique subduction.

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

Gunung Slamet sebagai gunung tertinggi di Jawa Tengah merupakan stratovolcano yang telah mengalami beberapa kali erupsi. Secara administratif Gunung Slamet terletak di antara 5 kabupaten, yaitu Kabupaten Brebes, Kabupaten Banyumas, Kabupaten Purbalingga, Kabupaten Tegal, dan Kabupaten Pemalang, Provinsi Jawa Tengah. Tubuh vulkanik Gunung Slamet merupakan hasil dari dua fase vulkanisme yang saling tumpang tindih, yaitu Gunung Slamet Tua dan Gunung Slamet Muda. Produk gunungapi  Slamet Tua melampar di bagian barat, sedangkan produk gunungapi Slamet Muda tersebar di bagian timur. Salah satu produk vulkanisme Slamet Muda adalah dijumpainya puluhan kerucut sinder yang tersebar baik secara berkelompok maupun berdiri sendiri (soliter) di lereng timur Gunung Slamet. Tujuan dari pembuatan makalah ini adalah untuk mengidentifikasi keragaman geologi dari beberapa kerucut sinder yang terdapat di lereng timur Gunung Slamet sebagai warisan geologi, dan selanjutnya direkomendasikan sebagai objek wisata berbasis edukasi geologi (geowisata). Metode pengidentifikasian dilakukan berdasarkan “Standar teknis inventarisasi keragaman geologi dan Petunjuk Teknis Asesmen Sumberdaya Geologi” yang dikeluarkan oleh Pusat Survei Geologi (2017). Dari hasil pengamatan Citra TerraSAR dan pengambilan data di lapangan, kerucut sinder di lereng timur Gunung Slamet berjumlah 37 buah, dimana morfologi kerucut sinder tersebut memiliki nilai warisan geologi tinggi karena mengandung rekaman ilmiah, tatanan geologi atau bentangalam yang spesifik, yang dapat dimanfaatkan untuk penelitian, pendidikan, pemahaman alam dan konservasi. Untuk memudahkan penilaian secara kualitatif potensi suatu keragaman geologi sebagai situs warisan geologi, dipilih 3 kerucut sinder yang dianggap mewakili dan memiliki keragaman tersendiri (keragaman bentang alam dan batuan), yaitu kerucut sinder Bukit Lompong, Bukit Siremeng, dan Bukit Batusanggar. Dari hasil pembobotan nilai tersebut maka kerucut sinder di lereng timur Gunung Slamet memiliki penilaian scientific “Sedang”.Kata kunci: Slamet Tua, Slamet Muda, lereng timur, kerucut sinder, geowisata.

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) .

The studied area belong to Teluk Semanting vilage and Tanjung Batu vilage, Pulau Derawan District, Berau Regency, East Kalimantan Province.Coal Bearing Formation is Sajau Formation with the younger from Latih Formation at PT. Berau Coal mine, description is black, vitreous luster, subconcoidal fracture, very hard to soft, brown streak, is general resin and piryt and sometimes wood structure. Phisycal is based on Sub Bituminus B Coal. Outcrop is followed the folded wich North West – South East, the range of strike N300ºE – N00ºE and N120ºE – N170ºE. The dip of coal is 8ºNE - 28ºNE and 5ºSW - 13ºSW.Indicated reserve of coal at study area is based on resources calculating with make use of the regional geologic explanation has reached 136 million ton, This reserve belong to the middle of the big mining.Quality of coal at study area with the measured parameter is “inherent Moisture” =10,20%-14,58,8%, Ash = 1,10%-7,61%, “Volatile Matter” = 36,58%-45,49%, “Fixed Carbon” = 37,50-45,72%, “Total Sulphur” = 0,12%-2,86%, Calorivic value the range = 5.666 – 6.427 Kkal/kg.

Pangandaran merupakan daerah yang terdiri dari karakteristik batugamping grainstone, packstone, wackestone dan batugamping kristalin. Studi ini dilakukan untuk mengetahui sebaran spesies calcareous nannofosilyang terdapat dalam satuan batugamping penyusun dari Anggota Batugamping Formasi Pamutuan. Penelitian yang dilakukan pada 2 (dua) titik lokasi measuring section diperoleh 40 lapisan batugamping pada Anggota Batugamping Formasi Pamutuan. Analisis sampel batugamping menggunakan metode suspensi dan dikeringkan dibawah UV light dan observasi preparate slide nannofosil di bawah mikroskop dengan perbesaran 1000x berdasarkan counting technique. Berdasarkan hasil identifikasi, didapatkan spesies nannofosil antara lain Catinaster coalithus, Calcidiscus macintyrei, Calcidiscus leptoporus, Coccolithus miopelagicus, Coccolithus sp., Cyclicargolithus floridanus, Discoaster quinqueramus, Discoaster sp., Hughesius sp., Helicosphaera carteri, Helicosphaera sp., Reticulofenestra spp. (2-3mm), Reticulofenestra spp. (3-4 mm), Reticulofenestra pseudoumbilicus, Sphenolithus abies Sphenolithus heteromorphus, Sphenolithus moriformis, Sphenolithus sp. dan Umbellosphaera irregularis. Selain itu, penelitian ini juga menyajikan catatan Sphenolithus yang memiliki kelimpahan sangat baik dan memiliki distribusi menerus yang tercatat dari umur Miosen Tengah hingga Miosen Akhir. Sphenolithus adalah salah satu spesies nannofosil yang penting untuk proxy pada kondisi oligotrofik yang mampu beradaptasi dengan peningkatan stratifikasi air laut.

ABSTRACTCimandiri fault formed during stage II orogenesis is the oldest fault at the end of the middle Eocene. The Cimandiri fault is the active fault that developed a paleo high and uplifted the Ciletuh Formation within front arc basin. The stage III orogenesis at the Late Eocene indicated by regional compression in the Java that affected to reactivation fault. This fault known to be the same as the Baribis thrust fault. Finally, the compression tectonic decreased that it created the normal fault on Cimandiri thrust-fold. Therefore, we can define the Cimandiri fault into two regional fault patterns. The first pattern, the thrust fault that indicated by high bedding inclined. The second pattern, the next pattern is the normal fault that revealed by fault scarps inclination more than 50o or even vertical in some locations. Keywords: Cimandiri fault, front arc basin, Ciletuh valley, Cimandiri Valley. ABSTRACKSesar Cimandiri merupakan sesar tua yang terbentuk selama berlangsungnya orogenesa tahap II, yaitu pada waktu Akhir Eosen Tengah. Pada saat itu  batuan sedimen Formasi Ciletuh berumur Eosen Tengah yang terbentuk di dalam Cekungan Depan Busur  sudah terangkat ke permukaan. Sesar ini terus aktif hingga menyebabkan terbentuknya  tinggian purba (paleo-hight) antara Lembah Ciletuh dan Lembah Cimandiri. Pada Akhir Tersier, tektonik kompresi kembali terjadi, menyebabkan untuk ketiga kalinya sesar Cimandiri teraktifkan kembali sebagai sesar naik. Peristiwa ini disimpulkan sebagai orogenesa ke III di Pulau Jawa. Salah satu struktur sesar regional yang terbentuk pada saat itu adalah Sesar Baribis. Setelah tektonik kompresi berkurang terjadi kesetimbangan menyebabkan terbentuknya sesar normal pada jalur lipatan anjakan Cimandiri. Oleh karena itu, Sesar Cimandiri terdiri atas dua sesar regional yang pertama sebagai sesar naik yang dicirikan oleh deformasi lipatan batuannya yang umumnya tegak, dan sebagai sesar normal yang dicirikan dengan terbentuknya gawir sesar dengan kemiringan di atas 50° bahkan di beberapa lokasi mendekati vertical. Kata Kunci: Sesar Cimandiri, Cekungan Depan Busur, Lembah Ciletuh, Lembah Cimandiri.

Characteristics of the river basin in Citanduy landslide prone areas are showing behaviors that canThe study was conducted to investigate the characteristics of the sediment, particularly sediment texture, and the amount and spread of microorganisms (nannoplankton and foraminifera) at the seafloor surface sediments of the northern waters of Madura. Karaktersistik sediment analysis is intended to determine the sediment texture, as for the analysis of microorganisms to determine the abundance, genus and species or the dominant characteristic in this area and its relation to bathymetric position on the line pantai.Analisis dab dilakukanterhadap laboratory 15sampel seabed surface waters of the North Madura, with a depth range between 5-77 m. Based on sediment texture can be seen that the sediment is composed of clay, silt and clay lanauan pasiran, which generally contains shell fragments microorganisms. On the seafloor surface sediments can be determined 20 species of nannoplankton and planktonic foraminifera and 30spesies 16spesies Benton foraminifera, with an abundance of being. Abundance and diversity increased with increasing depth nannoplanktoncenderung and proximity to the shoreline. Abundance and keanekaragamanterendah around the northern coastline of the island of Java and Madura Strait. This is probably due to the influence of antripogenik in this area. Species that were found relatively evenly and always appear in each sample was Emiliania huxleyi and Gephyrocapsa Oceanica. Gephyrocapsa is found predominantly in samples around the shoreline. Planktonic foraminifera abundance and diversity tends to increase with increasing depth and distance to the shoreline. Globigerinoides ruber is very common. Benton foraminifera dominated by Rotalina. The common genus is Ammonia, Quinqueloculina, Spiroloculina, Triloculina, Asterorotalia, Cibicides, Cancris, Elphidium, and Textularia Pseudorotalia, which tend to be more abundant at sites located in the north (away from the beach). Cibicides showed maximum abundance in the relatively distant from the coastline. Ratio of the total abundance of foraminifera plankton foraminifera tend to increase with increasing distance to the shoreline and depth.

This research aims to identify the lithological characteristics as well as the occurrence of larger benthic foraminifera in limestone from the Cikangkung and surrounding area, Sukabumi Regency with coordinates between 106°25'40.707" E to 106°28'23.581" E and 7°19'00.738" S to 7°21'12.833" S. The area is predominantly by rock units belonging to the Cikarang Member of the Jampang Formation and the Cibodas Formation. With focuses on classifying limestone and distinguishing the limestone from those two formations through petrographic characteristics, and microfossil analysis, four types of limestone were identified as tuffaceous limestone, grainstone, packstone, and boundstone. Petrographic analysis shows compositional differences in the tuffaceous limestone, which contains pyroclastic materials such as glass, silica minerals, and mafic minerals, in line with the high volcanic activity. Based on ten species of the larger benthic foraminifera, tuffaceous limestone was deposited during the Early Miocene (Te5),  which led to the age of deposition of carbonate volcaniclastic rocks in the Cikarang Member of Jampang Formation. Meanwhile, the other three limestone types do not contain pyroclastic components, indicating low volcanic activity during their deposition and it was deposited during the Mio-Pliocene. Based on similarities in age, environment, and characteristics of grainstone, packstone, and boundstone types are grouped as part of the Cibodas Formation, which was deposited during the Late Miocene to Pliocene (Tf3–Th). This study contributes to understanding the stratigraphic differences and the geological history of the limestone in this region, highlighting the influence of volcanic and marine processes on limestone formation.Keywords: Limestone, Cikangkung, Cibodas Formation, Cikarang Member of Jampang Formation

Penelitian Stratigrafi rinci mengenai daerah vulkanik masih jarang dilakukan. Hal ini biasanya dikarenakan oleh kondisi lapangan yang sulit ditempuh. Akan tetapi, penelitian fasies vulkanik  ditujukan untuk mengetahui perkembangan gunungapi secara geologi baik dari segi kebencanaan atau potensi. Penelitian ini berlokasi di Sub DAS Cibadak Lereng Timur Gunung Salak untuk mengetahui perubahan litologi baik secara lateral maupun vertikal. Permasalahan dipecahan dengan Observasi lapangan dan karakteristik permukaan. Data lapangan berupa lintasan-lintasan stratigrafi berdasarkan daerah sub DAS Cibadak yang terdiri dari sungai cibadak, cikuda, cipanengah dan cimenteng. Berdasarkan fasies vulknik dari keseluruhan analisis , terdapat 6 kelompok fasies dari muda ke tua yaitu Block and ash flow deposit 2 salak, lava flow 2 salak, block and ash flow deposit 1 salak, lava flow 1 salak, pumice flow deposit salak dan scoria flow deposit pra salak.

Cimandiri Fault is a regional fault that stretching from Pelabuhanratu (Sukabumi) to end up in the complex area of Mt. Tangkubanprahu – Mt. Burangrang (Subang - Northward of Bandung). Regional fault has been widely studied, but there are differences of opinion, especially regarding the type of shift.This study aimed to examine all aspects relating to Cimandiri Fault, especially along the segment Tagokapu-Cibogo (Padalarang-Citatah), so that can be known about the type of the fault. Steps and methods of research, among others, to analyze the landscape through satelite image, make observations, descriptions and measurement of geological structure elements, data processing by program using "dip" and "Paleostress" softwares. Cimandiri fault lines along the segment Tagokapu-Cibogo, can be recognized from various aspects, among others, from the aspect of geomorphology characterized by differences in the shape and elevation of the hills; from stratigraphical aspects there are contact between rock formations of different ages; from fold structure aspects there are found standing upright rock layers; and from the aspect of fault outcrop, there were indications that the fault is generally associated with horizontal fault. From the results of the analysis showed that the lineament of Cimandiri Fault along Tagokapu-Cibogo segment, controlled by a reverse fault and normal faults that formed in different tectonic period.

The research about study on geochemistry igneous rocks of Gunung Pongkor, Bogor, West Java. Basuki, et al., (1994) summarized the geology of the Pongkor areas consists of pyroclastic rocks (breccias and tuff) and lava flows and domes. Some problem to identifications which can in this research shall be as follows : How chemical composition and rocks afinity and also its evolution of exist in Mount Pongkor area have typical marking?.Samples of the Gunung Pongkor were extensively analyzed for major oxides and trace elements. Compositions of geochemical samples have been plotted and are used in drawing petrogenetic inferences. Igneous rocks Gunung Pongkor belong to the medium calc-alkalic to high Calc-alkalice suites (Peccerillo and Taylor; 1976), and have SiO2 contents in the range of 61,34-68,55%, middle and TiO2 and Al2O3 successively high (14,99-19,63%) and lower (< 0,50%); while K2O range from 1,90-2,55%. Other characteristic is the existence of some example of more enriched in Rb content and Ba. This Enrichment is also expressed by K2O content which relative higher. Than Ni element content and low Cr, and also Mg number ([Mg#]) less than 65, designate that its rock is not primitive, or equally experience of larger ones crystal fraksinasi from its mains magma.

Kesuburan alami tanah merah mengandung unsur hara makro seperti nitrogen, fosfor, dan kalium meningkatkan produksi tanaman. Penambangan tanah merah tidaklah semudah yang dibayangkan karena karena belum tahu perkiraan ketebalan tanah merah untuk kearea prospek. Tahapan eksplorasi guna mengetahui persebaran dan estimasi cadangan yang dapat mengurangi resiko dalam upaya penambangan tanah merah. Metode penelitian  yang digunakan berupa pengukuran geolistrik 1D dengan jumlah 15 titik pengukuran dengan luas 30 ha. Tujuan dari penelitian ini yaitu mengetahui pola sebaran dan estimasi cadangan tanah merah pada desa Tanjung kecamatan Surian kabupaten Sumedang.  Hasil penelitian menunjukan tanah merah memiliki niali resistivitas >30 ohm.meter dengan ketebalan  berkisar 3.5-20 meter dengan pola persebaran acak  dengan warna coklat kemerahan, berbutir lempung lanauan. Kemudian pada bagian bawahnya berupa batulanau, dan batupasir dari formasi batuan sedimen.Kata kunci : Resistivitas, Surian, Tanah merah

Ophiolite outcrops offers a unique opportunity to learn directly oceanic lithosphere, as ophiolite represents one of the few outcrops of rock that body can not be reached. Ophiolite is interpreted in the context of plate tectonics, as part of the oceanic lithosphere thrust into the continent during the first phase of orogenesa. Many geologists believe that the definition of ophiolite according to Penrose Field Conference in 1972, which is a typical sequence of rocks composed of, starting from the bottom: the complex ultramafic, gabbro complex, complex sheeted mafic dikes, complex mafic-volcanic and sedimentary pelagos. Ophiolite sequence may be incomplete, torn or termetamorfisme. Group ophiolite in area Ciletuh is an assemblage of mafic rocks (basalt, gabbro and ultramafic (peridotite, serpentinite), which is closely associated with the sedimentary-volcanic and metamorphic rocks. Generally ofiolitnya a sequence ophiolite very incomplete, and the mechanism of the transferor-tempatannya (emplacement ) can be equated with ophiolite "Cordilleran", which is rather a ophiolite (ocean floor, which did not contain fragments of the continent) above the subduction complex.

The geology of the Aceh Baratdaya has been controlled by convergence of the Eurasian and Indian lithospheric plates since the Mesozoic era. Various types of rock—including the metamorphic, meta-sedimentary, volcanic, and plutonic rocks—and the associated economic mineral deposits have been formed by diverse geologic proceses (i.e., sedimentation, lithification, metamorphosis, crystallization, and structural processes) associated with convergent plate interactions.The magnetic iron ores in the study area are interpreted as the crystallization product of hydrothermal solutions. Genetically, the iron ore in the study area is of lateritic type. Most of the ores in the study area are spread in northwest-southeast direction, in harmony with the general trend of faults and folds.

The Cisanggarung area is located in Cimenyan District, Bandung Regency, an area composed of volcanic products that many thick outcrops are found and used as andesite mines managed by local communities. This study examines the characteristics of andesite in the Cisanggarung area using petrology, petrography, XRF, and ICP-MS so that petrogenesis can be interpreted. Andesite rocks in the Cisanggarung area have a sheeting joint structure and microscopically have porphyritic, trachytic, glomeroporphyritic, zoning, embayment, and sieve textures. The composition of this rock was plagioclase, pyroxenes, opaque minerals with the less content of secondary minerals such as chlorite and clay minerals. The magmatic affinity of this rock shows calc-alkaline series, precisely in tholeiitic island arc tectonic setting associated with subduction, which is characterized by TiO2<1.3 wt.%. Magma presumably comes from a continent plate with a depth of 127.87-136.92 km. Magma in this area undergoes a middle-stage differentiation process, namely assimilation and fractionation crystallization. The magmatism process forms two stages of crystallization, starting from the slow cooling stage, followed by relatively fast magma to the surface.

The area of this study include to PT. Energi Mega Persada Tbk work area. The area of this study is located in Jambi Sub - Basin, South Sumatera Basin. This study is emphasized to examine the sequence stratigraphy of Talang Akar Formation. The data that is used in this study include core, mudlog, 3D seismic, well log, and palynomorf fossil. The result of those data analysis and data correlation are lithofacies, electrofacies, depositional environment, and stratigrahys sequences of Talang Akar Formation. From data analysis, the facies’ that develop in Talang Akar Formation are A, B, C, D, E, F, G, H, I, J, K, L, and M. Those facies’are deposited in fluvial – deltaicenvironment at Late Oligocene until Early Miocene. From the well correlation and seismic interpretation, the sediment distribution pattern of Talang Akar Formation become thicker and deeper in the west side and the highland is located relatively in the east of the study area. At the area of study Talang Akar formation is very influenced by structure. From the lithofacies and electrofacies analysis, there are six kinds of stratigraphy sequencesthat develop in the study area. System tracts LST-1 (braided channel) just developed at sequence-1. The other sequences developed TST 1 – 4 (floodplain meandering channel), TST 5 – 6 (marsh delta plain), HST 1 – 4 (crevasse splay meandering channel) and HST 5 – 6 (floodplain delta plain). .  Keywordsi: Sequence stratigraphy, facies,depositional environment, Talang Akar Formation, Jambi Sub - Basin. Daerah penelitian termasuk ke dalam wilayah kerja PT. Energi Mega Persada Tbk. Daerah penelitian berada di Sub – Cekungan Jambi, Cekungan Sumatera Selatan. Studi ini difokuskan untuk membahas sikuen stratigrafi Formasi Talang Akar. Dalam penelitian ini, data yang digunakan adalah core, mudlog, seismik 3 dimensi, well log, dan fosil palinomorf. Hasil dari analisis dan korelasi data tersebut adalah litofasies, elektrofasies, sikuen stratigrafi, dan lingkungan pengendapan dari Formasi Talang Akar. Dari analisis data tersebut didapatkan bahwa fasies yang berkembang pada Formasi Talang Akar adalah fasies A, B, C, D, E, F, G, H, I, J, K, L, dan M. Fasies tersebut diendapkan di lingkungan fluvial – deltaic pada umur Oligosen Akhir sampai Miosen Awal. Berdasarkan korelasi antar sumur dan interpretasi seismik, distribusi sedimen Formasi Talang Akar lebih menebal dan mendalam pada sisi barat dengan tinggian yang berada relatif pada bagian timur daerah penelitian. Pada daerah penelitian Formasi Talang Akar sangat dipengaruhi oleh struktur serta berdasarkan analisis litofasies dan elektrofasies terdapat 6 sikuen yang berkembang pada daerah penelitian. System tracts LST-1 (braided channel) hanya berkembang pada sikuen-1. Pada sikuen lainnya berkembang TST 1 – 4 (floodplain meandering channel), TST 5 – 6 (marsh delta plain), HST 1 – 4 (crevasse splay meandering channel) dan HST 5 – 6 (floodplain delta plain). Kata kunci : Sequence stratigraphy, facies, depositional environment, FormasiTalang Akar, Sub Cekungan Jambi.

Sustainability of production of bottled drinking water is highly dependent and influenced by the condition of the recharge zone. Thus, knowledge and understanding of local conditions and the behavior of groundwater recharge to the springs is required. To get a decent source of water produced and minimize the impact can inflict negative, then P.T. Tirta Investama implemented several stages such as literature study, identifying the area, a preliminary survey, detail survey, EIA studies, the production (construction and installation), and recharge area study at least one year. Protection of water resources taken from the aquifer is not used by people around in general (aquifers) as well as against the source of water which is generally utilized by the population (unconfined aquifer) translated in the construction of a well borehole. Meanwhile, study catchment areas become the crucial factor in the management of groundwater, natural feedback input is one of the factors associated with the process of infiltration.From this study obtained distribution of the origin of groundwater (recharge) to the water that comes out (discharge) and the layers that tend vulnerable to groundwater contamination. Studies recharge area for a minimum of one year is a very important study as sustainable groundwater resource management efforts in order water balance in a region.

Geothermal is a renewable energy resource that is used for various needs, both as heat energy on a local scale to electricity production on an industrial scale. The search for geothermal resources is difficult and costly, thus a survey method is needed that can facilitate the geothermal exploration stage in a large area coverage.  Remote sensing methods can be an adequate tool to guide investigations of geothermal prospect areas through the elaboration of potential hydrothermal resource maps at the level of profitable potential zones for exploitation. The purpose of this study is to identify areas that support geothermal exploration and exploitation in the Ijen Mountains area, East Java. The method used includes processing OLI (Operational Land Imager) and TIRS (Thermal Infrared Sensor) sensor images from the Landsat-8 satellite to obtain the distribution of hydrothermal alteration zones and surface temperature anomalies. Identification of permeable zones based on fracture density in the study area was also carried out by analyzing Digital Elevation Model (DEM) data to obtain the topographical features of the study area. The results of the study show that there is a correlation between the parameters used in several areas which are then interpreted as geothermal prospect zones. The moderate to high prospect zone was found to be associated with most of the known presence of geothermal manifestations.