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All Journal Bulletin of Scientific Contribution : Geology Indonesian Journal of Applied Sciences IJOG : Indonesian Journal on Geoscience Jurnal RISET Geologi dan Pertambangan Journal of Engineering and Technological Sciences Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) BULLETIN OF THE MARINE GEOLOGY Buletin Sumber Daya Geologi Jurnal Geologi Kelautan: Media Hasil Penelitian Geologi Kelautan KURVATEK Indonesian Journal on Geoscience Indonesian Journal on Geoscience Jurnal Locus Penelitian dan Pengabdian Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Journal of Geosciences and Applied Geology

Ildrem Syafri

Faculty Of Geological Engineering, Padjadjaran University, Jatinangor, 45363, West Java, Indonesia

Author-ID : 398579

Aerospace Engineering Automotive Engineering Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Mathematics Physics Social Sciences

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KARAKTERISTIK BATUAN METAMORF BAYAH di DESA CIGABER, KABUPATEN LEBAK, PROVINSI BANTEN Patonah, Aton; Syafri, Ildrem
Bulletin of Scientific Contribution Vol 12, No 2 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Metamorphic rocks in Bayah Complex included by Bayah mountain zone. Purpose of this research is to know characteristic of this rock with using petrography methods, that is, identify texture, structure, mineral contain, and metamorphic facies of the rocks. The result showed that kind of the rock is dominated by biotite schist, some actinolite schist, hornblend schist and chlorite schist. Almost all them have retrograde metamorphism, is characterized by biotite altered to chlorite and muscovite, hornblende to actinolite, and actinolite to chlorite. This proses probably associated by uplift processes in Eocene – Oligocene.

EKLOGIT TERUBAH DAN BATUAN ASOSIASINYA SEBAGAI INDIKATOR SUBDUKSI PURBA SELAMA EOSEN ATAS HINGGA OLIGOSEN BAWAH DI SABUK METAMORFIK SULAWESI TENGAH BAGIAN TIMUR - INDONESIA Syafri, Ildrem
Bulletin of Scientific Contribution Vol 12, No 3 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Eclogite is a metamorphic of rock derived from the continental crust or oceanic crust that can provide important information about the early stages of the orogenic process. In the Sulawesi island, eclogite or eclogite facies known expose in several places (Tectonic Complex of Bantimala, Palu valley and Bongka River Valley). In addition to these locations, eclogite have been also decouvert in the melange complex of Wasuponda. Wasuponda Eclogites shows a different textural and mineralogical composition than Bantimala eclogite or eclogite facies of Palu valley on the response of different processes occured. These rocks formed in a different geological times which provides information about two ancient subduction zones in the western and eastern parts of Central Sulawesi metamorphic belt.This study aims to obtain meaningful information about the chronology of the Sulawesi island in the Cretaceous and post Cretacepous periods. Some selected examples of eclogite and its associated rocks have been observed in petrographic and rock forming minerals of these rocks have been analyzed chemically using Microprobe Camebax and SX 50. The results of chemical analysis allows us to classify minerals appropriately used in the pressure and temperature condition of the rock formation. The maximum pressure and temperature conditions obtained from the application of geotermobarometer is 21.6 kbar for a temperature in 580 °C, while the application Thermocalc program provides pressure with an average of 20.7 ± 2.6 kbar at temperature in 500 ± 29 ° C. The pressure and temperature are very similar to the P-T conditions of eclogite formation of complex tectonic of Bantimala. Taking into account the uncertainty of the values for pressure, then the pressure obtained indicate that the eclogite formation was in depth of 61 to 80 km.Altered eclogite from Wasuponda undergone retromorphose towards the amphibolite - and green schist facies, while in stability field of amphibolite facies, these rocks are associated with garnet quartz, rutile, phengit, epidote schist and garnet, hornblende, quartz, rutile, muscovite, epidote schist and they have emerged to the surface and presented as a component melange of Wasuponda. Pressure and temperature conditions obtained from the study indicates that the direction of the P-T path of Wasuponda eclogite is clockwise. This condition is contrary to the results obtained by Parkinson (1991) of the blue schist and rock associations derived from Melange Peleru.Eclogite from Wasuponda Melange Complex likely originated from the ancient oceanic crust and are classically referred to layer 3 which is expected a gabbroic by composition. Magmatic paragenesis on this rock observed under the microscope are: clinopyroxene, plagioclase and opaque minerals, while eclogitic paragenesis are garnet, omphasite, phengite and rutile. Mineral paragenesis indicating retromorphose stage are calco-sodic amphibole, sphene and plagioclase, and they are present in the matrix.When a rock undergones a retrograde stage (toward the surface), the eclogite experienced an oceanic metamorphism indicated by the presence of edenite, edenitic hornblende, also hematite, quartz and chlorite showing the amphibolitation process, while minerals like zoisite, albite, white mica, calcite and zeolite states sausuritisation process that occured at high temperature and low pressure.

KANDUNGAN MIKROFOSIL DALAM FORMASI PEMBAWA BATUBARA DARI DAERAH PERIAN KECAMATAN MUARA MUNTAI, KABUPATEN KUTAI KERTANEGARA, KALIMANTAN TIMUR -, Winantris; -, Ildrem Syafri; -, Rusman Rinawan
Bulletin of Scientific Contribution Vol 4, No 1 (2006): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The research uses two kinds of microfossils for an aim to produce more precision, which Palinomorph as a main object and foraminifera as the support object. Pollen analysis has the main role in paleo-environment reconstruction, based on ecological characteristics plants association. Using palinomorph and foraminifera together in one research can only be conducted through sediments transition. Coals are included in the category, where coal samples were taken from Sungai Perian near Pulaubalang-Pamaluan formation boundary.From four samples that were analyzed (1R / claystone, 3R / claystone, 5R / claystone carbonaceous, and 7R / claystone) 53 genera and only 5 foraminifera species was founded. Both microfossils have yielded the same interpretation. The relative ages of the pollen indicator are from Middle-Early Miocene, and the relative ages of the foraminifera are from Late-Early Miocene. Based on the palinomorph and foraminifera data the research area was on regressions environment during the geologic period mentioned.

HUBUNGAN ANTARA PHYLLIC ALTERATION DENGAN NILAI KEKUATAN BATUAN DI UNDERCUT LEVEL TAMBANG GRASBERG BLOCK CAVE (GBC) PT. FREEPORT INDONESIA Zakaria, Firman; Zakaria, Zulfialdi; Syafri, Ildrem; Wiguna, Purwa
Bulletin of Scientific Contribution Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRACTThe Grasberg Block Cave (GBC) underground mine consists of multiple intrusion stages become into the Grasberg Intrusion Complex (GIC). The intrusion is consists of three intrusion stages, Dalam Intrusion Complex (DIC), Main Grasberg Intrusion (MGI) and Kali Intrusion (KI). The emplacement of intrusions occurred in a relatively short span between 3.51Ma (Dalam stage), 3.21Ma (Main Grasberg stage) and 3.1Ma (Kali stage). The existence of magmatic activity that occurs is the main control of mineral formation changes that affect the condition of rocks and quality of Cu-Au. Different type of alteration and mineralization on GIC rock can change its physical properties. Variations of mineral alterations that are formed due to the variation of intrusion causes the variation of mineral alteration that affect the value of rock strength. The value of rock strength affects the determination of rock support that will be mined in the Grasberg Block Cave underground mine (GBC). XRD analysis with mineral content dominance quartz 30.07%, sericite 22.72%, k-feldspar 13.38%, fe sulphide 9.80% and CaSulfate 5.72%. XRD analysis results are type of phyllic alteration. Point load analysis in the research area of 347 pieces of rock drill hole found rock strength value is dominated by weak (0.2 – 1 Mpa) - medium (1 – 2 Mpa). Rock Mass Rating (RMR) analysis calculation result value is RMR 20 - 60 (poor - fair). Keywords: Grasberg Block Cave, phyllic alteration, XRD Analysis, Point Load Test analysis, ABSTRAKTambang bawah tanah Grasberg Block Cave (GBC) terdiri dari beberapa tahapan intrusi yang tergabung ke dalam jenis Komplek Batuan Beku Grasberg (GIC). Tahapan intrusi dari tua ke muda adalah Dalam Intrusion Complex (DIC), Main Grasberg Intrusion (MGI) dan Kali Intrusion (KI). Adanya aktifitas magmatik yang terjadi merupakan kontrol utama pembentukan mineral ubahan yang berpengaruh terhadap kondisi batuan. Variasi mineral ubahan yang terbentuk akibat dari adanya variasi intrusi menyebabkan adanya variasi mineral ubahan yang berpengaruh terhadap Tambang bawah tanah Grasberg Block Cave (GBC) terdiri dari beberapa tahapan intrusi yang tergabung ke dalam jenis Komplek Batuan Beku Grasberg (GIC). Tahapan intrusi dari tua ke muda adalah Dalam Intrusion Complex (DIC), Main Grasberg Intrusion (MGI) dan Kali Intrusion (KI). Adanya aktifitas magmatik yang terjadi merupakan kontrol utama pembentukan mineral ubahan yang berpengaruh terhadap kondisi batuan dan kualitas cebakan Cu-Au. Variasi mineral ubahan yang terbentuk akibat dari adanya variasi intrusi menyebabkan adanya variasi mineral ubahan yang berpengaruh terhadap nilai mekanika batuan. Analisa XRD dengan dominasi kandungan mineral quartz 30.07%, sericite 22.72%, k-feldspar 13.38%, fe sulphide 9.80% dan casulfate 5.72%. Hasil analisis XRD tersebut masuk ke dalam tipe phyllic alteration. Analisis uji kuat tekan batuan (Point Load Test) pada daerah penelitian terhadap 347 buah conto batuan lubang pemboran memberikan nilai kekuatan batuan didominasi oleh nilai kekuatan batuan lemah (weak, 0.2 – 1 Mpa) - sedang (medium, 1 – 2 Mpa). Kata kunci: Grasberg Block Cave, phyllic alteration, XRD Analysis, Point Load Test.

KARAKTERISTIK BATUAN SEDIMEN BERDASARKAN ANALISIS PETROGRAFI PADA FORMASI KALIBENG ANGGOTA BANYAK Purasongka, Novianti Wahyuni; Syafri, Ildrem; Jurnaliah, Lia
Bulletin of Scientific Contribution Vol 13, No 1 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Administratively, the research areas included in the district of Semarang, Central Java Province. This research was conducted at Jeragung River with the object of claystone and sandstone. In physiographic, rocks in the study area are in Kendeng Basin, and parts of Anggota Banyak Kalibeng Formation. This study aims to determine the characteristics of sedimentary rocks mainly sandstones, based on petrographic analysis to determine the source of the sediment and diagenesis processes that formed. Based on observations of six sandstone samples from areas of research included in Feldspatic Wacke. Provenance analysis of six samples of sandstone with using Dickinson and Suczek triangles, shows the origin of sediment is arc magmatic. Diagenesis phase which occurs is eogenesis characterized by compacting and leaching, mesogenesis marked by cementation and recrystallization, as well as the replacement and deformation marks telogenesis process.

IDENTIFIKASI PROSPEK ANDESIT MENGGUNAKAN METODE GEOLISTRIK DI KECAMATAN CILAKU, KABUPATEN CIANJUR, JAWA BARAT ilmi, irpan; Taufan, Yoqi Ali; Denis, Mutebi; Nur, Andi Agus; Syafri, Ildrem
Bulletin of Scientific Contribution Vol 16, No 3 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Survei geolistrik ini dilakukan untuk mengetahui sebaran batuan andesit dan perlapisan pasir yang terdapat dibawah permukaan (di dalam bumi). Batuan tersebut memiliki nilai tahanan jenis kelistrikan (resistivitas) yang berbeda antara material-material lainnya dengan memanfaatkan sifat kelistrikan batuan untuk memetakan kondisi geologi di bawah permukaan. Kegiatan survei 2D geolistrik dilakukan selama 4 hari, yaitu dari 14-17 November 2017, di Kecamatan Cilaku, Kabupaten Cianjur, Jawa Barat. Pengukuran geolistrik ini dilakukan dengan menggunakan metoda resistivity konfigurasi Wenner dua dimensi, seta penyelidikan dilakukan sebanyak 21 lintasan pengukuran berarah Utara – Selatan, titik elektroda 0 berawal di utara dan titik elektroda 48 di selatan. Dari hasil pengukuran dan pengolahan data lapangan dapat dibuat model 2D penampang geolistrik untuk setiap lintasan, peta anomali lateran kedalam, dan 3D gabungan dari seluruh lintasan. Anomali sebaran di daerah penyelidikan dapat di bagi dalam beberapa kelompok anomali yaitu : 1. Anomali rendah, dengan kisaran nilai resistivitas 0 Ωm - 30 Ωm yang -menyebar pada kedalaman 0 – 10 m. Anomali ini di tandai dengan warna biru, di duga lapisan zona akuifer pasir terisi air. 2. Anomali sedang, dengan kisaran nilai resistivitas 30 Ωm - 90 Ωm. Anomali yang diduga lapisan pasir, lempung dan anomali ini juga dapat berupa pasir lempungan dengan banyak konkresi yang bersifat gampingan. Pada kedalaman 40-50 m lapisan ini terdapat menyebar di utara daerah penyelidikan. 3. Anomali tinggi dan sangat tinggi, dengan kisaran anomali lebih dari 100 Ωm. Anomali ini terdapat di tenggara daerah penyelidikan. Anomali ini ditandakan warna merah yang merupakan daerah paling menarik untuk untuk dijadikan prospek.Kata kunci : Geolistrik, Andesit, Cilaku, Resistivitas, Model 2D

PENDEKATAN KUANTITATIF DALAM PENENTUAN ASOSIASI FASIES LAUT DALAM FORMASI HALANG PADA SUNGAI KALIGINTUNG, JAWA TENGAH SUBAGJA, MUHAMAD AGAM; Setiadi, Djadjang Jedi; Jurnaliah, Lia; Syafri, Ildrem; Alam, Syaiful; Elfitra, Dhanu
Bulletin of Scientific Contribution Vol 17, No 3 (2019): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Penggunaan metode kuantitatif cukup berkembang pada tahun 1950an dalam bidang sedimentologi dan stratigrafi terutama dalam membantu menjelaskan asosiasi fasies, proses pembentukannya dan lingkungan pengendapan. Lokasi penelitian berada koordinat 07° 30' 00,0" – 07° 30’ 30.0” LS dan 109° 27' 30,0" – 109° 28’ 10,0” BT yang secara administratif berada pada Provinsi Jawa Tengah. Daerah penelitian termasuk ke dalam Formasi Halang. Tujuan dari penelitian ini adalah untuk mengetahui model asosiasi fasies lokal yang terbentuk pada daerah penelitian. Pengambilan data dilakukan dengan metode penampang stratigrafi terukur pada sebagian lintasan Sungai Kaligintung sedangkan pengolahan data dibantu oleh metode kuantitatif berupa analisis Markov Chain dan Binomial Probability untuk mengetahui hubungan antar fasies. Pada daerah penelitian terdapat 13 litofasies yaitu Diorganized gravels (A1.1), Normally-graded Pebbly Sand (A2.7), Thick-bedded disorganized sand (B1.1), Thin-bedded coarse-grained sand (B1.2), Parallel-stratified sand (B2.1), Thick-bedded sand-mud couplet (C2.1), Medium-bedded sand-mud couplet (C2.2), Thin-bedded sand-mud couplet (C2.3), Mud-dominated sand-mud couplet (C2.4), Mottled muddy sand (C1.2), Structureless silt (D1.1), Structureless mud (E1.1) dan Contorted strata (F2.1). Adapun asosiasi fasies pada daerah penelitian terdiri atas Channel fill deposit, Levee deposit, Lobe deposit dan Interchannel deposit. Kata kunci : Binomial Probability, Formasi Halang, Litofasies, Markov Chain.

MINERALISASI PADA BREKSI HIDROTERMAL, DAERAH TEPU, TAMBANG EMAS TERBUKA KELIAN, KECAMATAN LINGGANG BIGUNG, KABUPATEN KUTAI BARAT, PROPINSI KALIMANTAN TIMUR -, Antonius Bambang Yuniarto; -, Ildrem Syafri
Bulletin of Scientific Contribution Vol 7, No 2 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

This research was carried out at the southern pit wall in the open gold mining area of PT. Kelian Equatorial Mining, located at 00 00 '32, 56 "S - 00 05 '09, 14" South Latitude and 1150 23’ 29,02" - 1150 28' 04,73" East Longitude. Administratively, it located in the Tepu area, Subdistrict of Linggang Bigung, West Kutai, East Kalimantan province. Physiographically that area is a part of Central Kalimantan volcanic arc.Rocks exposed in this area can be divided into 4 (four) rock units, i.e. The Eocene Sandstone Unit; The Lower Miocene Andesitic Pluton Unit; The Middle Miocene Hydrothermal Breccia Unit; and The Early Miocene Diatreme Breccia Unit.Geological structures that developped in this area were joints and faults. The faults are dilational structures types, in the form of sinistral- and dextral normal faults. These geological structures facilitated the penetration of andesite, followed by the appearence of hydrothermal fluids which produced the formation of hydrothermal breccia, and diatreme breccia. Hydrothermal breccia fragment consisting of andesite and sandstone, usually in jigsaw textured which are arranged in a matrix rock flour (Sillitoe, 1985), i.e. very fine grained material that came from milling process of breccia fragments. The carbonate minerals in the form of bladed texture are dominat minerals that filled the interfragments and matrix cavities. Partially, apart of carbonate minerals, the bladed silica was also present in cavity filling. The cavity filling minerals are associated with the appearence of metallic minerals.The alteration zones in the research area can be grouped into three zones, namely: 1.) Zone containing chlorite + clay + sericite + adularia + carbonate 2.) Zone containing sericite + carbonate + clay + adularia ± quartz and 3.) Zone containing carbonate + clay + sericite + adularia + quartz / silica. These alterations are classified as subpropylitic - until phyllic zones (Corbett & Leach, 1996). Metal mineralization such as sphalerite, galena, pyrite, covellite, arsenopyrite and chalcopyrite are associated with carbonate alteration ± adularia ± quartz ± sericite ± clay were primarily formed as a cavity filling and veins in hydrothermal breccia. The analysis results of Au and Ag contents in some rocks samples of hydrothermal breccia ranged from 0.04 grams / ton to 8.96 grams / ton Ag and 0.55 to 11.8 grams / ton, while the recovery of Au ranged between 16.08% up to 85.12%. The highest content and % recovery value of Au was founded in hydrothermal breccia.The mineralization stages can be divided into three stages: 1). The pre-brecciation stage that associated with the occurence of chlorite, sericite, adularia, clay and pyrite dissemination as well as the formation of carbonate veinlets and quartzs in direction of the Northwest - Southeast, 2) The syn-brecciation stage, it related to the formation of hydrothermal breccia, i.e. the occurence of carbonate and silica enrichment and the alteration minerals such as sericite, adularia, clay that related to the deposition of base metals as cavity filling and as veinlets in the direction of Southwest-Northeast. 3) Post-breccia stage was related to the occurence of carbonate veinlets ± base metals which associated with the clay minerals. Those cut the fragments, rock flour matrix, cavities filling minerals in hydrothermal breccia after the their formation in the direction of Southwest-Northeast.Mineralization in the area of study occured as ore deposits in hydrothermal breccia and in the veins as well as the veinlets. Hydrothermal breccia formed by two processes, i.e.; structural control and high-pressure hydrothermal fluids, at the temperature more than 200° - 250° C, with the acidity condition of (pH) 6, 6-8, 3. This condition is classified as a system of low sulphidation that related to porphiry with gold-carbonate base metal deposits (Corbett & Leach, 1996).

SURVEI MAGNETOTELURIK DAERAH PANAS BUMI MARANDA, KABUPATEN POSO, PROVINSI SULAWESI TENGAH Awaludin, Winarno; Hutabarat, Johanes; Syafri, Ildrem; Sugianto, Asep
Bulletin of Scientific Contribution Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRAKSurvei Magnetotelurik (MT) telah dilakukan di daerah panas bumi Maranda yang terletak di Kabupaten Poso, Sulawesi Tengah. Pola struktur geologi di daerah Maranda didominasi oleh arah utara-selatan yang berasosiasi dengan arah sesar naik Poso yang berada di bagian baratnya dan pola struktur berarah relatif barat-timur sebagai antitetiknya. Hasil perhitungan dengan geotermometer silika baik pada kondisi conductive cooling maupun adiabatic cooling menunjukkan nilai yang hampir sama dimana suhu reservoir berdasarkan geotermometer kelompok mata air panas Maranda berkisar antara 125-184°C. Tujuan survei ini adalah untuk mengetahui struktur tahanan jenis bawah permukaan yang berkorelasi dengan sistem panas bumi. Pengukuran MT di daerah panas bumi Maranda telah dilakukan pada 42 titik ukur yang tersebar membentuk 8 buah lintasan berarah baratdaya-timurlaut dengan jarak antar titik ukur sekitar 1000 m. Peta tahanan jenis (MT) memperlihatkan adanya pola kelurusan berarah baratlaut-tenggara dengan sebaran tahanan jenis tinggi di sebelah baratdaya dan sebaran tahanan jenis rendah di sebelah timurlaut. Batuan penudung yang dicirikan dengan nilai tahanan jenis rendah berada di sebelah timurlaut di antara mata air panas Maranda dan mata air panas Kawende dengan pola yang membuka ke arah timurlaut. Batuan penudung ini diperkirakan berada di dekat permukaan hingga kedalaman 750 meter dengan ketebalan 500-750 meter. Kata kunci: magnetotelurik, panas bumi, Maranda, Sulawesi Tengah ABSTRACTMagnetotelluric (MT) surveys have been conducted in the Maranda geothermal area located in Poso District, Central Sulawesi. The geological structure pattern in the Maranda region is dominated by the north-south direction associated with the Poso thrust fault in the west and the structures pattern of relative east-west trending as their antithetes. The results of calculations with silica geotherm meter in both conductive cooling and adiabatic cooling conditions show almost the same value that the reservoir temperature based on the geothermometric of the Maranda hot springs ranges from 125-184 ° C. The purpose of this survey is to knowing the structure of the subsurface resistivity that correlates with the geothermal system. Measurements of MT in geothermal Maranda have been done on 42 scattered points forming 8 trajectory direction southwest-northeast with the distance between the measuring point about 1000 m. The type resistance maps (MTs) show an alignment pattern in northwest-southeast direction with high resistance range in the south-west and low-end resistance range to the northeast. The cap rocks that are characterized by low-end resistance values are northeast of Maranda's hot springs and Kawende's hot springs with a pattern that opens to the northeast. The cap rocks are estimated to be near the surface to a depth of 750 meters with a thickness of 500-750 meters. Keywords: magnetotelluric, geothermal, Maranda, Central Sulawesi

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

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

Co-Authors A. Sudradjat A. Sudradjat A. Sudradjat Abdurrokhim ⠀ Abdurrokhim, . Achmad Noerkhaerin Putra Adi Hardiyono, Adi Adjat Sudradjat Adjat Sudradjat Adjat Sudradjat Adjat Sudradjat Adjat Sudradjat Adjat Sudrajat Adjat Sudrajat Agus Didit Haryanto Agus Didit Haryanto -, Agus Didit Haryanto Agus Nur, Andi Agustiany, Irfani Agustina Djafar Agustinus, Eko Tri Sumarnadi Ahadi Ahmat Lamburu Ahmad Luthfi Aini, Hana Nur Almun Madi Amitama, Emilia Bunga Andi Agus Nur Andi Agus Nur, Andi Agus Antonius Bambang Yuniarto -, Antonius Bambang Yuniarto Aprillia, Belinda Rizka Ardiansyah, Reza Asep Mohamad Ishaq Shiddiq Aton Patonah Aton Patonah, Aton Awaludin, Winarno Benyamin Benyamin Benyamin Benyamin, Benyamin Benyamin, Benyamin Bonar Tua Halomoan Marbun Brian Christiantoro Budi Muljana Budiadi, E. Christiantoro, Brian Denis, Mutebi Deny Setiady Djadjang Jedi Setiadi Djajang Sukarna E. T. Paripurno E. T. Paripurno Eko Tri Sumarnadi Agustinus Eko Tri Sumarnadi Agustinus Electricia, K.S. Elfitra, Dhanu Embara, Patra Emi Sukiyah Emy Sukiyah Euis Tintin Yuningsih Euis Y. Yuningsih, Euis Y. Evaristus Budiadi F. G, Aiwoy Fachrudin, Kurnia Arfiansyah Fadhly, Ahmad Febri Hirnawan Febriwan Mohamad, Febriwan Febriwan Mohammad, Febriwan Febyani, Siska Firman Herdiansyah, Firman G. Hartono G. Hartono Ginanjar, Asep Hadian, Muhamad Sapari Dwi Hadian, Muhamad Sapari Dwi Hana Morina, Hana Hananto kurnio Hartawi Riskha Hartawi Riskha, Hartawi Hartono, G. Hartono, Udi Haryadi Permana Hastowo Resesiyanto Hendarmawan Hendarmawan Hendarmawan Hendarmawan, Hendarmawan Heri Hermiyanto Zajuli, Heri Hermiyanto Hermes Panggabean Hermes Panggabean Herry -, Herry Hilarius Rodriguez Hilarius Rodriguez, Hilarius Hill Gendoet Hartono Hutabarat, Johannes ilmi, irpan Iqbal Ramadhan, M. Iqbal, M. Irzon, Ronaldo Irzon, Ronaldo Iskandar Zulkarnain Ismawan Ismawan Ismawan Ismawan, Ismawan Iwan Setiawan Johanes Hutabarat Johanes Hutabarat Johannes Hutabarat K, Mohammad Fatahillah Pradana Kapid, Roebiyanto Kurnia Arfiansyah Kurnia Arfiansyah, Kurnia kurnio, Hananto kurnio, Hananto Lia Jurnaliah Lili Fauzielly M. Iqbal M. Iqbal Manwarjit, Manwarjit Marbun, Bonar Tua Halomoan Mayasari, Verna Mega F. Rosana, Mega F. Mega Fatimah Rosana Mega Fatimah Rosana Mega Fatimah Rosana Moeh. Ali Jambak Moeh. Ali Jambak, Moeh. Ali Moh. Heri Hermiyanto Zajuli Moh. Heri Hermiyanto Zajuli Muhamad Sapari Dwi Hadian Muhammad Kurniawan Alfadli Muhammad Zulfikar Muhammad Zulfikar Nana Sulaksana Nana Sulaksana Nana Suwarna Nana Suwarna Nana Suwarna Nanda Natasia Nazar Nurdin Noor Cahyo Dwi Aryanto Noor Cahyo Dwi Aryanto Novianti Wahyuni Purasongka, Novianti Wahyuni Nuarihidayah, Gilang Diesty Nugroho, Sigit Dwi Nuraini , Siti Paripurno, E. T. Petra Wattimury Prabowo, Arief Prasetio, Rasi Prasetio, Rasi Prasetya, Muhammad Nurul Huda Purnama Sendjaja Purnama Sendjaja Puspita, Ramelia Eka Rahmola, Wiryadi Rizkiputra Ralanarko, Dwandari Ramzis, Novaldo Rasi Prasetio Resesiyanto, Hastowo Reza Ardiansyah Reza Ardiansyah Rivaldy, Mohammad Rodriguez, Hilarius Roebyanto Kapid Ronaldo Irzon Ronaldo Irzon Ronaldo Irzon Rosana, Mega Fatimah Rosana, Mega Fatimah Rosana, Mega Fatimah Rusman Rinawan -, Rusman Rinawan Satrio Satrio Satrio, Satrio Satrio, Satrio Sendjaja, Purnama Sendjaja, Purnama Sendjaja, Purnama Shaska Zulivandama Shiddiq, Asep Mohamad Ishaq Siti Nuraini SUBAGJA, MUHAMAD AGAM Suci Sarah Andriany, Suci Sarah Sudarsana, Muhammad Rizki Sudradjat , Adjat Sudradjat, A. Sudradjat, A. Sudradjat, Adjat Sudradjat, Adjat Sudrajat, Adjat Sugianto, Asep Sulaksana, Nana Suwarna, Nana Swasty Aninda Piranti Syaiful Alam Syaiful Bachri Tampubolon, Armin Taufan, Yoqi Ali Udaya Kamiludin Udi Hartono Udi Hartono Vijaya Isnaniawardhani Viqnoriva, S.N. Wahyu Sugiarto Wattimury, Petra Wiguna, Purwa Wilda Aini Nurlathifah Winantris Winantris Winarti Winarti Yan Rizal, Yan Yoga Andriana Sendjaja, Yoga Andriana Yogi Fernando, Yogi Yudi Darlan Yusriyah, Dzakiyah Zakaria, Firman Zarkasyi, Ahmad Zulfialdi Zakaria, Zulfialdi Zulkarnain, Iskandar ⠀, Abdurrokhim ⠀, Winantris

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