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Ikhwannur Adha
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jigpangea@upnyk.ac.id
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Jurusan Teknik Geologi Jl. Padjajaran, Sleman, Yogyakarta, Indonesia. 55283
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INDONESIA
Jurnal Ilmiah Geologi pangea
ISSN : 2356024X     EISSN : 2987100X     DOI : https://doi.org/10.31315
Jurnal Ilmiah Geologi Pangea (JIG Pangea) is an Indonesian scientific journal published by the Geological Engineering Department, Faculty of Mineral and Technology, UPN "Veteran" Yogyakarta. The journal receives Indonesian or English articles. Those articles are selected and reviewed by our professional editors and peer reviewers. The published article in JIG Pangea covers all geoscience and technology fields including Geology, Geophysics, Petroleum, Mining, and Geography. The subject covers a variety of topics including : geodynamics, sedimentology and stratigraphy, volcanology, engineering geology, environmental geology, hydrogeology, geo-hazard and mitigation, mineral resources, energy resources, medical geology, geo-archaeology, applied geophysics and geodesy.
Articles 219 Documents
Identifikasi Potensi Panas Bumi di Kabupaten Tuban, Provinsi Jawa Timur Menggunakan Citra ASTER dengan Metode Land Surface Temperature Samudra, Gusti Tegar; Hidayat, Muhammad Syarif
Jurnal Ilmiah Geologi PANGEA Vol. 11 No. 1 (2024): Jurnal Ilmiah Geologi Pangea
Publisher : PROGRAM STUDI TEKNIK GEOLOGI FAKULTAS TEKNOLOGI MINERAL UPN VETERAN YOGYAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jigp.v11i1.12620

Abstract

Indonesia merupakan salah satu negara dengan Cadangan panas bumi terbesar di dunia, namun sampai saat ini pemanfaatannya belum dilakukan secara maksimal dikarenakan biaya yang diperlukan terbilang mahal. Potensi panas bumi di Indonesia tersebar di berbagai daerah, salah satunya di Kabupaten Tuban, Jawa Timur. Penelitian ini bertujuan untuk mengidentifikasi keberadaan titik panas bumi dengan memanfaatkan teknik penfinderaan jauh menggunakan metode Normalized Difference Vegetation Index (NDVI) dan Land Surface Temperature (LST). Data yang digunakan berupa citra Advanced Spaceborn Thermal Emission and Reflection (ASTER) pada daerah penelitian. Keberadaan potensi panas bumi dapat diketahui dengan mendeteksi suhu permukaan bumi menggunakan peta LST. Peta LST diperoleh dari peta NDVI dan perhitungan nilai emissivitas. Suhu Permukaan bumi di daerah penelitian berdasarkan peta LST berkisar antara 21 – 31 ºC. Terdapat 5 titik pada daerah penelitian yang diperkirakan merupakan manifestasi panas bumi
Simulasi Respon Airtanah terhadap Kegiatan Dewatering pada Lokasi Penggalian Stasiun Bawah Tanah MRT A dan B di Kota Jakarta Pusat Absari, Hirundini Rustica; Widodo, Lilik Eko; Sadisun, Imam Achmad
Jurnal Ilmiah Geologi PANGEA Vol. 11 No. 1 (2024): Jurnal Ilmiah Geologi Pangea
Publisher : PROGRAM STUDI TEKNIK GEOLOGI FAKULTAS TEKNOLOGI MINERAL UPN VETERAN YOGYAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jigp.v11i1.12703

Abstract

Kegiatan penggalian dan dewatering yang dilakukan di kawasan perkotaan menghadapi tantangan akibat keberadaan airtanah. Airtanah yang tidak dikontrol dapat mengganggu kestabilan bangunan-bangunan bersejarah dan penting yang berada di sekitar lokasi penggalian. Lokasi kegiatan penggalian dan dewatering berada di Kota Jakarta Pusat, Provinsi DKI Jakarta, yang dilakukan untuk konstruksi dua stasiun bawah tanah MRT yang berjarak 800 m. Lokasi ini berada di Cekungan Airtanah Jakarta dengan litologi penyusun berupa endapan kipas aluvium dengan material butir berukuran lempung hingga pasir sendang berumur Kuarter. Kegiatan dewatering dilakukan dengan menggunakan sumur pelepasan tekanan (pressure relief well) sebanyak 46 sumur di Stasiun Bawah Tanah A dan 29 sumur di Stasiun Bawah Tanah B dengan kapasitas 4,15 m³/s per sumur . Simulasi airtanah dilakukan menggunakan Softwater Visual Modflow dengan metode numerik beda hingga berdasarkan beberapa asumsi untuk menyederhanakan pembuatan model airtanah. Pemantauan respon airtanah dilakukan dengan pengamatan terhadap perubahan head dan drawdown selama 1186 hari. Pada lokasi Stasiun Bawah Tanah A, terjadi penurunan head (drawdown) sebesar 3,1 m, sedangkan pada Stasiun Bawah Tanah B terjadi drawdown sebesar 5,5 m. Pengaruh dewatering dapat terlihat hingga jarak 550 m dengan drawdown sebesar 1- 8 cm.
Analisis Kestabilan Lereng Berdasarkan Mohr-Coulomb dan Generalized Hoek-Brown pada Tambang Terbuka Batubara, Desa Tegalrejo dan sekitarnya, Kabupaten Muara Enim, Provinsi Sumatra Selatan Siswanda, Faiza Melati; Riswandi, Herry
Jurnal Ilmiah Geologi PANGEA Vol. 11 No. 1 (2024): Jurnal Ilmiah Geologi Pangea
Publisher : PROGRAM STUDI TEKNIK GEOLOGI FAKULTAS TEKNOLOGI MINERAL UPN VETERAN YOGYAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstrak – Pemilihan penggunaan kriteria keruntuhan yang tepat dalam analisis kestabilan lereng dapat mengurangi ketidaktepatan hasil analisis dalam memperoleh nilai Faktor Keamanan (FK) dari desain lereng yang dibuat, sehingga dibutuhkan dasar dalam pemilihan penggunaan kriteria keruntuhan yang tepat. Limit Equilibrium Methods (LEM) dan Morgenstren-Price merupakan metode yang digunakan dalam analisis ini. Klasifikasi massa batuan yang digunakan yaitu Rock Mass Rating (RMR) dan dari hasil analisisnya tergolong sedang hingga baik. Hasil perbandingan kriteria keruntuhan Generalized Hoek-Brown dengan maupun tanpa damage region menunjukkan nilai FK yang lebih kecil dibandingkan pada kriteria keruntuhan Mohr-Coulomb. Nilai FK pada Mohr-Coulomb berkisar dari 1,463-1,830 sedangkan nilai FK pada Generalized Hoek-Brown tanpa damage region sebesar 1,024-1,438 nilai FK pada Generalized Hoek-Brown dengan damage region sebesar 1,110-1,875. Hasil nilai Probabilitas Kelongsoran (PK) menunjukkan nilai yang sama yaitu 0%. Nilai FK Generalized Hoek-Brown dengan maupun tanpa damage region yang lebih kecil dibandingkan Mohr-Coulomb dipengaruhi oleh variabel pada litologi seperti struktur dan kondisi bidang diskontinuitas serta nilai disturbance factor (D) sebagai dampak dari aktivitas penggalian dan peledakan yang mereduksi nilai FK sehingga lebih memvisualisasi kondisi aktual di lapangan sedangkan kriteria keruntuhan Mohr-Coloumb tidak dipengaruhi oleh kondisi tersebut dan secara sederhana hanya melibatkan nilai material properties dari batuan itu sendiri. Kata Kunci: Generalized Hoek-Brown, kestabilan lereng, klasifikasi massa batuan, Mohr-Coulomb, Muara Enim Abstract – Determining the appropriate use of failure criteria in slope stability analysis can reduce the inaccuracy of analysis results in obtaining the Safety Factor (SF) value from the slope design created so that a basis is needed for determining the appropriate use of failure criteria. Limit Equilibrium Methods (LEM) and Morgenstren-Price are the methods used in this analysis. The rock mass classification used is Rock Mass Rating (RMR) and the analysis results are classified as moderate to good. The comparasion result of the Generalized Hoek-Brown failure criteria with and without damage region show a smaller SF value compared to the Mohr-Coulomb failure criteria. The SF value on Mohr-Coulomb ranges from 1,463-1,830 while the SF value on Generalized Hoek-Brown without damage region is 1,024-1,438 and the SF value on Generalized Hoek-Brown with damage region is 1,110-1,875. The results of the Probability of Failure (PoF) value show the same value 0%. The SF value of Generalized Hoek-Brown with and without damage ragion is smaller than the Mohr-Coloumb are influenced by variables in lithology such as the structure and condition of discontinuity as well as the disturbance factor (D) value as the impact of excavation and blasting activities which reduces the SF value and it can better visualizes the actual conditions in the field. Meanwhile, the Mohr-Columb failure criteria are not influenced by those conditions and simply involve the value of the material properties of the rock itself. Keywords: Generalized Hoek-Brown, safety factor, rock mass rating, Mohr-Coulomb, Muara Enim
Persebaran Pola Struktur Geologi Melalui Pendekatan Topografi dan Morfologi Daerah Tancep dan Sekitarnya, Gunungkidul, Yogyakarta Adha, Ikhwannur; Mardiati, Dani; Kurniawan, Oki; Utama, Peter Pratistha; Rachman, Muhammad Gazali; Krisnabudhi, Alfathony
Jurnal Ilmiah Geologi PANGEA Vol. 11 No. 1 (2024): Jurnal Ilmiah Geologi Pangea
Publisher : PROGRAM STUDI TEKNIK GEOLOGI FAKULTAS TEKNOLOGI MINERAL UPN VETERAN YOGYAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jigp.v11i1.12752

Abstract

Tancep merupakan desa yang berada di tenggara Bayat dan perbatasan antara Klaten dan Gunungkidul. Tancep dan sekitarnya memiliki struktur geologi yang cukup kompleks sebagaimana area yang berdekatan dengan Bayat. Penelitian terdahulu menyatakan bahwa struktur geologi yang berkembang pada lokasi ini cukup kompleks terutama sesar yang terbentuk. Namun, dari penelitian terdahulu tersebut kurang menggambarkan bagaimana persebaran pola struktur geologinya. Kajian pendahuluan ini dilakukan untuk menunjukkan persebaran pola struktur geologi yang berkembang di daerah Tancep dan sekitarnya melalui pendekatan topografi dan morfologi. Kajian ini dilakukan dengan harapan dapat memberikan gambaran awal untuk memetakan secara detil struktur geologi di lokasi tersebut. Penelitian dilakukan dengan pendekatan topografi dan morfologi serta interpretasi berdasarkan penelitian terdahulu. Analisis pada penelitian ini dilakukan dengan menggunakan analisis kelurusan topografi dan morfologi baik kelurusan punggungan bukit, kelurusan lembah, maupun kelurusan sungai. Kelurusan tersebut digambarkan dalam peta fault fracture density yang kemudian diinterpretasikan pola persebaran struktur geologi di daerah penelitian. Tancep dan sekitarnya secara umum memiliki tiga arah umum kelurusan topografi dan morfologi yaitu berarah barat daya-timur laut, barat laut-tenggara, dan utara-selatan. Pola kelurusan ini diinterpretasikan sebagai pola struktur geologi yang berkembang dan mengontrol topografi dan morfologi daerah penelitian. Pola struktur geologi berarah barat daya-timur laut merupakan pola utama yang berkembang di daerah penelitian. Sedangkan pola struktur geologi berarah barat laut-tenggara dan utara-selatan merupakan pola struktur geologi penyerta yang terbentuknya dapat terjadi karena beberapa kemungkinan.Kata Kunci: Tancep, Pola Struktur Geologi, Kelurusan.
ANALISIS POTENSI GEOTHERMAL DAERAH SEKITAR GUNUNG CIREME BERDASARKAN CITRA LANDSAT 8 2019 Putera, Gumilang Barata Ayodya Candra; Wijanarko, Alif Habibi; Danisworo, Raditya; Mubarak, Arrijal Hasan
Jurnal Ilmiah Geologi PANGEA Vol. 11 No. 1 (2024): Jurnal Ilmiah Geologi Pangea
Publisher : PROGRAM STUDI TEKNIK GEOLOGI FAKULTAS TEKNOLOGI MINERAL UPN VETERAN YOGYAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jigp.v11i1.12793

Abstract

Analisis Potensi Geothermal Daerah sekitar gunung cireme berdasarkan citra landsat 8 2019 , Sebagai pembangkit Listrik dan pemanfaatan energi panas langsung  , pemanfaatan sulfur hasil dari geothermal dalam segi manfaat energi geothermal juga berdampak pada : ramah lingkungan , pengurangan emisi , pengembangan emisi , poptensi sumber daya , energi berkelanjutan , Pengolahan Envi bertujuan untuk mengetahui tingkat kerepatan vegetasi dan tempertur suatu daerah. Tingkat kerepatan vegetasi dengan menggunakan NDVI dan pengolahan suhu permukaan dengan menggunakan LST (Land Surface Temperature).Tahap awal dari pengolahan adalah melakukan koreksi radiometrik dan memotong daerah pada citra. NDVI (Normalized Difference Vegetation Index) merupakan  indeks ‘kehijauan’ vegetasi atau aktivitas fotosintesis vegetasi. Menggabungkan dan mengkombinasikan tiga gambar dari saluran atau band yang berbeda dari citra penginderaan jauh untuk menciptakan kombinasi warna yang bertujuan untuk menyoroti fitur tertentu dari objek yang sedang diamati. Berdasarkan hasil pengolahan didapat warna merah dalam peta LST yang menunjukkan daerah bersuhu tinggi, hijau bersuhu rendah-sedang, putih menunjukkan daerah bersuhu rendah.
Sediment Transport Mechanism and Provenance of Unconsolidated Sediments in Opak River Channel, Yogyakarta, Indonesia Widada, Sugeng; Putra, Roy Andika; Prahastomi, Mochammad; Rizky, Aga
Jurnal Ilmiah Geologi PANGEA Vol. 11 No. 1 (2024): Jurnal Ilmiah Geologi Pangea
Publisher : PROGRAM STUDI TEKNIK GEOLOGI FAKULTAS TEKNOLOGI MINERAL UPN VETERAN YOGYAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jigp.v11i1.12805

Abstract

This study focuses on the Opak River, which crosses administratively through two regencies, Sleman and Bantul. This research aims to reveal the sedimentation mechanism and provenance of Opak River sediment based on textural and sedimentary composition. Sediment samples were collected from ten points along the river channel, spanning from upstream to downstream. Granulometric and grain morphology analysis were conducted which the followed by QFL analysis wherein the presence of light detrital minerals (quartz, feldspar, lithic) was observed. The sediment texture of Opak River Channel generally consists of coarse-grained sand, poorly sorted, with varying degrees of roundness and sphericity, which are angular to sub-rounded and intermediate to sub-equant, respectively. Opak River sediment predominantly comprises Feldspar (20-48%), Quartz (4-17,9%) and Lithic (13,5-19,6%) which implies arkose-lithic arkose type. The sedimentation process in Opak River is mainly driven by the traction process, which is indicated by a 48-79% traction fraction on the probability log curve. Based on QFL analysis, it is inferred that the Opak River sediment originated tectonically derived from a magmatic arc setting, specifically a transitional arc subtype. The primary sediment source could have been derived from Mount Merapi with a potentially strong influence by the Oyo River, especially in the downstream of Opak River.
Geologi dan Pengaruh Struktur Kekar Terhadap Kestabilan Lereng Desain Pit Pada Tambang Terbuka Batubara Kecamatan Lawang Kidul, Kabupaten Muaraenim, Sumatra Selatan Riswandi, Herry; Fitri, Arnia
Jurnal Ilmiah Geologi PANGEA Vol. 11 No. 2 (2024): Jurnal Ilmiah Geologi Pangea
Publisher : PROGRAM STUDI TEKNIK GEOLOGI FAKULTAS TEKNOLOGI MINERAL UPN VETERAN YOGYAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jigp.v11i2.12939

Abstract

Open pit mining system is one of the systems used to exploitation coal resources by stripping the overburden to produce slopes. Unstable slopes will result in landslides. Fractures are one of the causes of landslides. The purpose of the study was to determine the geological and geotechnical conditions of the area to create an optimal and safe slope design. The research area is administratively located in Tanjung Lalang, Lawang Kidul District, Muara Enim Regency, South Sumatra Province, which is a mining business permit (IUP) area of PT Bukit Asam Tbk. Geographically located at the geographical coordinates 103° 49'0 "BT - 103° 50'20" BT and 3° 50'59" LS - 3° 50'9" LS. The research methods used are literature studies, geological mapping, profiles, Scanlines, data analysis, rock mass rating, RQD, RMR, SMR, GSI, kinematic analysis, and quantitative analysis to determine the FK (Safety Factor) value. The research area is included in the South Sumatra basin which is included in the Muara Enim Formation which consist of Muara Enim mudstone units aged Middle - Late Miocene, and Alluvial units aged Holocene in the form of loose material accumulation. The geological structure that developed in the research area is a left slip fault with SE-NW emphasis and fractures that have NE-SW direction emphasis. At observation location 7 has an RQD value of 22.2543%, RMR 48.4210, SMR 46.81, GSI 40.8654, at observation location 10 has an RQD value of 35.1343%, RMR 52.642 8, SMR 49.17, GSI 48.2671, at observation location 24 has an RQD value of 57.2979, RMR 64.375, SMR 61.27 and GSI 60.836 at observation location 2 has a GSI value of 30 and at observation location 16 has a GSI value of 25. Based on the results of the analysis of the FK value without the influence of fractures on Section A-A' 2.364, section B-B' 1.889 and section C-C' 2.546, the FK value with fractures on section A-A' 2.326, section B-B' 1.172 and section C-C' 1.389 based on the results of linear analysis of the influence of fractures on the decrease in FK value has a determination value of R² = 0.5836 (moderate) and the effect of the number of fractures on the decrease in FK value has a determination value of R² = 0.6948 (Strong). Based on the results of kinematic analysis on sections A-A' and C-C' have a Wedge Landslide Potential type while on section B-B' has a Toppling landslide potential type. Recommendations for increasing slope stability at LP 7 by changing the slope direction N 288ºE and slope 55º, at LP 10 slope direction N 325ºE and slope 62º, LP 24 slope direction N 005ºE and slope 44º. Positive geological potential in the research area is in the form of economical coal mines and PLTU, negative geological potential in the research area is in the form of landslides, acid mine water, air pollution and bare forests.
Pengaruh Mineral Pada Foliasi Terhadap Sifat Fisik dan Mekanik Batuan Metamorf di Daerah Bayat, Klaten, Jawa Tengah Pratama, Gilang Rizki; Ediyanto, Ediyanto
Jurnal Ilmiah Geologi PANGEA Vol. 11 No. 2 (2024): Jurnal Ilmiah Geologi Pangea
Publisher : PROGRAM STUDI TEKNIK GEOLOGI FAKULTAS TEKNOLOGI MINERAL UPN VETERAN YOGYAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jigp.v11i2.13169

Abstract

Bayat area is a place where one of the three oldest rock outcrops in Java is Pre-Tertiary and Paleogene age. Due to its geological conditions and relatively old age, the Bayat area is exposed to many distinctive metamorphic rocks. These rocks include rocks including marble, schist, phyllite, serpentinite, quartzite of Pre-Tertiary age, siltstone, sandstone, limestone, and igneous rocks including gabbro intrusions, basalt, and micro diorite. Foliated metamorphic rocks have a diversity of mineralogical, petrographic characteristics, and engineering properties. The results from 3 types of schist, namely mica schist, green schist, and graphite schist, show that the mechanical strength of the samples is generally the result of various parameters, such as foliation angle, mineral type, mineral size, and degree of weathering. The dominant minerals that comprise these three types of schist are mica, chlorite, quartz, k-feldspar and actinolite. The compressive strength test of the rock used the Point load index test method with the results of the compressive strength of green schist being 10.34 Mpa, mica schist being 4.66 Mpa, and graphite schist being 6.74. Linear regression correlation analysis is used to determine the magnitude of the correlation coefficient between mineral parameters and compressive strength so as to know how big the relationship between the two is and produce certainty of the correlation.
Geologi dan Daya Dukung Tanah Jalan Tambang pada Tambang Terbuka Desa Lok Bahu, Sungai Kunjang, Kalimantan Timur Pratiknyo, Puji; Simanjuntak, Liswan -
Jurnal Ilmiah Geologi PANGEA Vol. 11 No. 2 (2024): Jurnal Ilmiah Geologi Pangea
Publisher : PROGRAM STUDI TEKNIK GEOLOGI FAKULTAS TEKNOLOGI MINERAL UPN VETERAN YOGYAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jigp.v11i2.13458

Abstract

Analisis Multi-Geohazard dengan Metode Multi-Criteria Decision Analysis di Kawasan Ibu Kota Nusantara (IKN), Kalimantan Timur, Indonesia Naufal, Muhammad Adi; Bayuaji, Giri; Absari, Hirundini Rustica; Kurniawan, Fathoni Tri
Jurnal Ilmiah Geologi PANGEA Vol. 11 No. 2 (2024): Jurnal Ilmiah Geologi Pangea
Publisher : PROGRAM STUDI TEKNIK GEOLOGI FAKULTAS TEKNOLOGI MINERAL UPN VETERAN YOGYAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jigp.v11i2.13489

Abstract

The relocation capital city of Indonesia from Jakarta to the Nusantara Capital City is in North Penajam Paser Regency (Sepaku District) and Kutai Kartanegara (Samboja District and parts of Loa Kulu, Loa Janan and Muara Jawa Districts), East Kalimantan Province. The emergence of new centers of activity in the region led to increased vulnerability to geological hazards. Analysis of potential geological hazards is important to identify areas that have a high risk of these threats. This study combines the concept of "multi-hazard" to determine the overall potential of geological hazards in the development area of the Nusantara Capital City using the Multi-Criteria Decision Analysis method. Based on the geological conditions and history of disaster events in Nusantara Capital City, it can be concluded that this area has three geological hazards (multi-geohazard) that have a high potential to become a disaster, namely earthquakes, landslides, and floods. The results of the multi-criteria decision analysis on each geological hazard resulted in the fact that Penajam District has a high level of geological hazard compared to other sub-districts in the Nusantara Capital City area with a hazard threat level of less than 20%. This shows that in the development of the Nusantara Capital City area can be categorized as safe.