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All Journal Komunikasi Fisika Indonesia TAMBANG Jurnal Ilmiah MTG Jurnal IPTEK Journal of Geoscience, Engineering, Environment, and Technology Jurnal Penelitian Sains Jurnal Geomine Jurnal Ilmiah Universitas Batanghari Jambi PROMINE Jurnal Mineral, Energi dan Lingkungan Jambura Geoscience Review Jurnal Mineral, Energi dan Lingkungan Journal of Earth and Marine Technology (JEMT) Prosiding Seminar Nasional Teknologi Industri Berkelanjutan Berita Sedimentologi Jurnal Ilmiah Geologi pangea Journal of Geology Sriwijaya

Idarwati Idarwati

Teknik Geologi, Fakultas Teknik, Universitas Sriwijaya, Sumatera Selatan 30862, Indonesia

Author-ID : 3974311

Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Transportation

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MINERALISASI DAN POLA ALTERASI DAERAH LAKEA, KECAMATAN LAKEA KABUPATEN BUOL, PROVINSI SULAWESI TENGAH ., Idarwati, S.T., M.T.
PROMINE Vol 1, No 1 (2013): PROMINE
Publisher : Jurusan Teknik Pertambangan FT UBB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5.687 KB)

The research area is located in the village of Lakea, Lakea subdistrict, Buol district, Central Sulawesi Province. Constituent Lithology within research area consists of three units, these are litodem lava basalt that mainly be composed by lava andesite and lava basalt which partly fractured, volcanic breccia, and tuff; Sandstone Unit mainly composed by sandstone, mudstone, muddy sandstone, and conglomerate; and the last unit is limestone as Coral Limestone Unit. Alteration assemblage is divided into four zones, namely argillic alteration zone (silicon oxide (kuarsa), magnesium aluminum iron silicate hydroxide, potassium aluminum silicate hydroxide dan sodium calcium aluminum silicate (albit), phyllic alteration zone (serisit/muskovit-kuarsa-klorit-feldspar), propylitic alteration zone (Chlorite-serpentine, Illite, Albite, calcian, ordered, Quartz, Muscovite ), and silicified alteration zone (quartz/silica + adularia + calcitÂ± illite). The mineralization is controlled by open space filling with disseminated distribution. Gold mineralization usually associated with pyrite, chalcopyrite, and galena. Mineralization is found fill the major structural pattern with southeast-northwest direction. The fluid inclusion measurement results obtained that microthermometry Th (homogenization temperature when the fluid trapped in the crystals) ranged from 172 ~ 332 Â°C with a measurement range from 180.9 to 211.0 Â°C, and the melting temperature (first ice melting Temperatures / Tm) average ranges -1, 2 to 0.8 oC. By calculations, the depth of the formation rate is 79.4 ~ 1712 m, and under pressure about 8.2 ~ 130.3 bar.Keyword : Lakea, Buol, Alteration

Identifikasi Endapan Batuan Volkanik Berdasarkan Data Sistem Informasi Geografi (SIG) Daerah Danau Ranau, Propinsi Sumatera Selatan ., Idarwati
PROMINE Vol 3, No 1 (2015): PROMINE
Publisher : Jurusan Teknik Pertambangan FT UBB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5.687 KB)

Ranau Lake as the second biggest lake in Sumatra Island. On Plio-Pleistocene Ranau Volcano (Volcano-tectonic) eruption resulted the formation of Ranau Lake. After the great eruption of Ranau Volcano, grow up another volcanoes like Seminung Volcano, and become a Ranau Volcanic Complex. At the foot of Seminung Volcano often showed sulfur gas burst activity which are indicated by the death of organism in Ranau Lake. The increasing of burst gas and locally earthquacke to be the principle one to predict the possibility of volcano eruption for anticipation and decrease the impact of volcano eruption. The research objective was to determain the characteristics of rocks formation surrounding Ranau Lake using Landsat Imagery. Â Â Â Â Â Keywords: Ranau Lake, Volcano, Landsat Imagery.

Impact of Sulphur Content on Coal Quality at Delta Plain Depositional Environment: Case study in Geramat District, Lahat Regency, South Sumatra Sari, Siska Linda; Rahmawati, Mutia Armilia; Triyoga, Alan; Wati, Idar
Journal of Geoscience, Engineering, Environment, and Technology Vol 2 No 3 (2017): JGEET Vol 02 No 03 : September (2017)
Publisher : UIR PRESS

The research was conducted in Geramat District of Lahat Regency, South Sumatra. An evaluation of the geological condition of the research area shown that the coal deposits were found in Muara Enim Formation as a coal-bearing formation. The method used was literature study, field observation and the laboratory work includes proximate and petrography analysis. The aim of this research is to determine the environmental condition of coal based on the change of total sulphur content and to know the relation between ash content to calorific value.  As the result of proximate analysis conducted on five samples of coal, the research area obtained total sulphur (0,21-1,54% adb), ash content (3,16 - 71,11% adb) and gross calorific value (953 - 5676 cal/g. adb). Based on the result of maceral analysis showed the maceral percentage of coal in research area composed by vitrinite (77,8-87,4 %), liptinite (0,6 %), inertinite (8,0 – 17,6 %) and mineral matter concentration in the form of pyrite (1,6-4,6 %). The average reflectance value of vitrinite (Rv) of coal in the research area (0.54%). the results analysis shows that the coal in Muara Enim Formation on the research area is in the transitional lower delta plain depositional environment phase. Any changes in the sedimentary environment affected by sea water will be followed by changes in total sulphur and the higher ash content, on the contrary, the lower calorific value of the coal.

Impact of Sulphur Content on Coal Quality at Delta Plain Depositional Environment: Case study in Geramat District, Lahat Regency, South Sumatra Siska Linda Sari; Mutia Armilia Rahmawati; Alan Triyoga; Idar Wati
Journal of Geoscience, Engineering, Environment, and Technology Vol. 2 No. 3 (2017): JGEET Vol 02 No 03 : September (2017)
Publisher : UIR PRESS

The research was conducted in Geramat District of Lahat Regency, South Sumatra. An evaluation of the geological condition of the research area shown that the coal deposits were found in Muara Enim Formation as a coal-bearing formation. The method used was literature study, field observation and the laboratory work includes proximate and petrography analysis. The aim of this research is to determine the environmental condition of coal based on the change of total sulphur content and to know the relation between ash content to calorific value. As the result of proximate analysis conducted on five samples of coal, the research area obtained total sulphur (0,21-1,54% adb), ash content (3,16 - 71,11% adb) and gross calorific value (953 - 5676 cal/g. adb). Based on the result of maceral analysis showed the maceral percentage of coal in research area composed by vitrinite (77,8-87,4 %), liptinite (0,6 %), inertinite (8,0 – 17,6 %) and mineral matter concentration in the form of pyrite (1,6-4,6 %). The average reflectance value of vitrinite (Rv) of coal in the research area (0.54%). the results analysis shows that the coal in Muara Enim Formation on the research area is in the transitional lower delta plain depositional environment phase. Any changes in the sedimentary environment affected by sea water will be followed by changes in total sulphur and the higher ash content, on the contrary, the lower calorific value of the coal.

Characteristics of Coal and Cleat Attributes in Ulak Lebar and Surroundings Area, Lahat Regency, South Sumatra Mutia Armilia Rahmawati; Siska Linda Sari; Alan Triyoga; Idar wati
Journal of Geoscience, Engineering, Environment, and Technology Vol. 3 No. 2 (2018): JGEET Vol 03 No 02 : June (2018)
Publisher : UIR PRESS

The research conducted in Ulak Lebar Area, Lahat Regency, South Sumatra. The focus of this study is on the Muara Enim Formation as it is known as the main coal-bearing formation in South Sumatra Basin. The research is aimed to determine the characteristics of coal based on its physical properties, also knowing the cleat development at the coal seam in the research area. The methods used such as literature study, field observation and laboratory test. Field observations included the observations of coal megascopic appearance and cleat attributes analysis such as the measurements of cleat orientation, aperture, spacing and length. The analysis result of cleat at LP 2A and LP 2B shows a relatively similar such as spacing value ranged between 6 - 9 cm and 5.5 – 8.6 cm while the aperture value ranged from 0.05 - 0.2 cm, and 0.05 - 0.25 cm, whereas at LP 67 the spacing value ranged from 1.5 to 3.3 cm and the aperture valued between 0.1 - 0.3 cm. A rather significant difference between the cleat spacing values of LP 67 towards both previous observation stations is indicated by the geological processes occurred during the coalification process thus affected the development of cleats in coal, the geology structure control is characterized by a relatively large aperture and smaller spacing values. The laboratory test conducted is maceral analysis, shows the coal in the research area is dominantly composed of vitrinite (74,8%) and the vitrinite reflectance value is 0,40 indicating the coal classified as sub-bituminous rank.

POTENSI SUMBERDAYA BATUBARA DAERAH NYUATAN KABUPATEN KUTAI BARAT PROVINSI KALIMANTAN TIMUR Idarwati Idarwati
Jurnal Ilmiah MTG Vol 4, No 1 (2011)
Publisher : Jurusan Teknik Geologi Fakultas Teknologi Mineral UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (9.277 KB)

Dewasa ini pemerintah tengah meningkatkan pemanfaatan batubara sebagai energi alternatif baik untuk keperluan domestik seperti pada sektor industri dan pembangkit tenaga listrik, maupun untuk keperluan ekspor. Sejalan dengan itu pemerintah telah melibatkan pihak swasta dalam pengusahaan pengembangan batubara.Secara administratif lokasi daerah penelitian terletak pada daerah Nyuatan dan sekitarnya, Kabupaten Kutai Barat, Provinsi Kalimantan Timur dengan geografis lokasi terletak pada koordinat 00.29’.14” – 00.32’.00” Lintang Utara dan 1150.14’.35” – 1150.18’.13” Bujur Timur. Formasi daerah penelitian ditempati oleh Formasi Warukin pada bagian utara yang berumur Miosen Tengah – Miosen Akhir dan pada bagian Selatan ditempati Formasi Pamaluan yang berumur Oligosen Akhir – Miosen Awal, yang membentang dari Baratdaya – Timurlaut dan merupakan Formasi pembawa batubara.

FASIES KUARTER VULKANIK DAERAH PAGAR JATI DAN SEKITARNYA, KAB.BENGKULU TENGAH, BENGKULU Aditya N.P.H; Oke Aflatun; Idarwati Idarwati
Komunikasi Fisika Indonesia Vol 15, No 2 (2018)
Publisher : Universitas Riau

The Jati Fence Area, Bengkulu is the fore arc basin area whose deposition is influenced by the volcanic event. The deposition event took place on a quaternary volcano that has been active in having sedimentation activities that continue. This study aims to carry out mineralogical analysis in the proximal facies deposit area with petrographic data at observation locations (LP) 14, 59, 81,108, and (ST) 14,70 which are sourced from the results of local geological mapping. In LP 81 and 14 with proximal facies have volcanic breccia lithology with compilation components which are dominated by andesitic rocks, pyroclastic matrix composition, packed packing, hard hardness, and mineralogicalcomposition which tend to have many crystals. In LP 59 and 108 proximal facies found andesite lava.

IDENTIFIKASI JENIS FOSIL POLLEN BERDASARKAN MORFOLOGI LINGKUNGAN PENGENDAPAN DAERAH SUKOMORO DAN SEKITARNYA Elisabet D. Mayasari; Idarwati Idarwati; Stevanus Nalendra
Jurnal Geomine Vol 5, No 3 (2017): Edisi Desember
Publisher : Universitas Muslim Indonesia

Daerah Sukomoro merupakan daerah yang termasuk ke dalam Formasi Palembang Tengah pada Cekungan Sumatera Selatan. Formasi ini dikenal dengan batuan yang terbentuk pada proses pasang-surut air laut. Bukti terjadinya pasang-surut air laut dapat dijumpai oleh kehadiran batugamping yang menjadi indikasi lingkungan pengendapan daerah neritik (laut dangkal) serta dijumpai amber (getah pohon) dengan jarak relatif dekat (± 1km). Berdasarkan analisa paleontologi, tidak dijumpai hadirnya fosil foraminifera pada sampel batugamping. Hal ini semakin menguatkan indikasi lingkungan pengendapan transisi pada daerah penelitian. Berdasarkan hasil analisa fosil pollen dijumpai indikasi kehadiran tumbuhan yang bervariasi mulai dari kelompok gymnospermae (tumbuhan berbiji terbuka hadir pada lingkungan darat), angiospermae (tumbuhan berbiji tertutup hadir pada lingkungan darat) dan pteridopytha (tumbuhan paku-pakuan hadir pada lingkungan darat yang berair) hingga mangrove (tumbuhan penciri daerah rawa). Dengan kehadiran variasi fosil-fosil tersebut, maka diinterpretasikan bahwa lingkungan pengendapannya adalah transisi terutama pada lingkungan intertidal (Henrich, 2007 dalam Mayasari, 2016). Lingkungan pengendapan ini dicirikan oleh morfologi dengan kemiringan lereng yang landai.

MINERALISASI DAN POLA ALTERASI DAERAH LAKEA, KECAMATAN LAKEA KABUPATEN BUOL, PROVINSI SULAWESI TENGAH Idarwati Idarwati
PROMINE Vol 1 No 1 (2013): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

The research area is located in the village of Lakea, Lakea subdistrict, Buol district, Central Sulawesi Province. Constituent Lithology within research area consists of three units, these are litodem lava basalt that mainly be composed by lava andesite and lava basalt which partly fractured, volcanic breccia, and tuff; Sandstone Unit mainly composed by sandstone, mudstone, muddy sandstone, and conglomerate; and the last unit is limestone as Coral Limestone Unit. Alteration assemblage is divided into four zones, namely argillic alteration zone (silicon oxide (kuarsa), magnesium aluminum iron silicate hydroxide, potassium aluminum silicate hydroxide dan sodium calcium aluminum silicate (albit), phyllic alteration zone (serisit/muskovit-kuarsa-klorit-feldspar), propylitic alteration zone (Chlorite-serpentine, Illite, Albite, calcian, ordered, Quartz, Muscovite ), and silicified alteration zone (quartz/silica + adularia + calcit± illite). The mineralization is controlled by open space filling with disseminated distribution. Gold mineralization usually associated with pyrite, chalcopyrite, and galena. Mineralization is found fill the major structural pattern with southeast-northwest direction. The fluid inclusion measurement results obtained that microthermometry Th (homogenization temperature when the fluid trapped in the crystals) ranged from 172 ~ 332 °C with a measurement range from 180.9 to 211.0 °C, and the melting temperature (first ice melting Temperatures / Tm) average ranges -1, 2 to 0.8 C. By calculations, the depth of the formation rate is 79.4 ~ 1712 m, and under pressure about 8.2 ~ 130.3 bar.

Endapan Batuan Volkanik Berdasarkan Data Sistem Informasi Geografi (SIG) Daerah Danau Ranau, Propinsi Sumatera Selatan Idarwati Idarwati
PROMINE Vol 3 No 1 (2015): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

Ranau Lake as the second biggest lake in Sumatra Island. On Plio-Pleistocene Ranau Volcano(Volcano-tectonic) eruption resulted the formation of Ranau Lake. After the great eruption of RanauVolcano, grow up another volcanoes like Seminung Volcano, and become a Ranau Volcanic Complex.At the foot of Seminung Volcano often showed sulfur gas burst activity which are indicated by thedeath of organism in Ranau Lake. The increasing of burst gas and locally earthquacke to be theprinciple one to predict the possibility of volcano eruption for anticipation and decrease the impact ofvolcano eruption. The research objective was to determain the characteristics of rocks formationsurrounding Ranau Lake using Landsat Imagery.

Co-Authors Aditya N.P.H Afrilita, Afrilita Afrilta Afrilita Alan Triyoga Alan Triyoga Alan Triyoga, Alan Daryono, Sapto Kis Dian Rahma Yoni, S.T., M.T. Dita Maulia Dyah Hastuti, Endang Wiwik Elisabet D. Mayasari Elisabet Dwi Mayasari Febrian, Muhammad Rizky Harnani Harnani Harnani, Harnani Hibatullah, Muhammad Ariq Intan Paramita Haty M. Ridho Naufalwan Maharani, Widyana Maulia, Dita Mayasari, Elisabet Dwi mega puspita Mifturrahma, Rizkiya Mutia Armilia Rahmawati Mutia Armilia Rahmawati Mutia Armilia Rahmawati, Mutia Armilia Oke Aflatun Pranata, Ridho Prasetya, Dyo Pratomo, Septyo Uji Rahmadani, Gea Fanny Rahmanita, Dwie Saputra, Pirdaus Setia Pambudi Siska Linda Sari Siska Linda Sari Siska Linda Sari, Siska Linda Stevanus Nalendra Stevanus Nalendra Jati Syaharani, Puan Rahima Yogie Zulkurnia Rochmana Yusar, Adri Taufiqurrahman

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