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All Journal Bulletin of Scientific Contribution : Geology IJOG : Indonesian Journal on Geoscience Jambura Geoscience Review Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri
Wisnu Ismunandar
Universitas Muhammadiyah Kalimantan Timur
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Electrical & Electronics Engineering Energy Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering

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Magma Evolution of Ngebel Volcano, Ponorogo, East Java, Indonesia Dwi Fitri Yudiantoro; Dyah Rini Ratnaningsih; Puji Pratiknyo; Mahreni Mahreni; Dewi Sri Sayudi; Intan Paramita Haty; Hafiz Hamdalah; Mirzam Abdurrachman; Isao Takashima; Wisnu Ismunandar; Richzkey Muhammad; Demi Ganjar Sampurno
Indonesian Journal on Geoscience Vol 10, No 1 (2023)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.10.1.51-62

Abstract

The magma evolution of Ngebel Volcano, both temporally and spatially, is represented by the characteristics of its lava. Ngebel Volcano, located in East Java, is a Quaternary andesitic stratovolcano. This volcano is part of the Wilis Volcanic Complex. The volcanism stage of Ngebel Volcanic Complex can be divided into the Jeding with andesitic basalt (SiO2 49 - 59%), pyroxene andesite Kemlandingan (SiO2 49 - 59%), Manyutan with hornblende andesite (SiO2 49 - 59%), and Ngebel with dacite (SiO2: 49 - 59%). The variation of major elements combined with petrographic features such as plagioclase, pyroxene, hornblende, quartz, and opaque minerals from basaltic andesite to dacite is interesting. The minerals show that the magma differentiation process of Ngebel Volcanic Complex is the results of fractional crystallization of magma. The purpose of this study is to determine the evolution of magma from volcanic rocks of which stratigraphic positions have been determined. The analytical methodology used is petrographic and geochemical analysis. Detailed temporal evolution shows that magma from the Ngebel Volcanic Complex underwent a differentiation process that changed the magma composition from mafic to more felsic.
Magma Evolution of Ngebel Volcano, Ponorogo, East Java, Indonesia Dwi Fitri Yudiantoro; Dyah Rini Ratnaningsih; Puji Pratiknyo; Mahreni Mahreni; Dewi Sri Sayudi; Intan Paramita Haty; Hafiz Hamdalah; Mirzam Abdurrachman; Isao Takashima; Wisnu Ismunandar; Richzkey Muhammad; Demi Ganjar Sampurno
Indonesian Journal on Geoscience Vol. 10 No. 1 (2023)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.10.1.51-62

Abstract

The magma evolution of Ngebel Volcano, both temporally and spatially, is represented by the characteristics of its lava. Ngebel Volcano, located in East Java, is a Quaternary andesitic stratovolcano. This volcano is part of the Wilis Volcanic Complex. The volcanism stage of Ngebel Volcanic Complex can be divided into the Jeding with andesitic basalt (SiO2 49 - 59%), pyroxene andesite Kemlandingan (SiO2 49 - 59%), Manyutan with hornblende andesite (SiO2 49 - 59%), and Ngebel with dacite (SiO2: 49 - 59%). The variation of major elements combined with petrographic features such as plagioclase, pyroxene, hornblende, quartz, and opaque minerals from basaltic andesite to dacite is interesting. The minerals show that the magma differentiation process of Ngebel Volcanic Complex is the results of fractional crystallization of magma. The purpose of this study is to determine the evolution of magma from volcanic rocks of which stratigraphic positions have been determined. The analytical methodology used is petrographic and geochemical analysis. Detailed temporal evolution shows that magma from the Ngebel Volcanic Complex underwent a differentiation process that changed the magma composition from mafic to more felsic.
GIS-BASED LANDSLIDE HAZARD ANALYSIS BASED ON WEIGHTED OVERLAY METHOD IN SAMARINDA, EAST KALIMANTAN Raharjanti, Ni'matul Azizah; Sutan, Syamsidar; Ismunandar, Wisnu; Alam, Fajar; Andhika, Muhammad Wira
Bulletin of Scientific Contribution Vol 21, No 3 (2023): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v21i3.51968

Abstract

Samarinda has experienced a frequent landslide disaster, accounting for 30% from the total disaster occurring in 2019. Based on these data, it is necessary to carry out the analysis on the landslide hazard as the mitigation to minimize the damage that may be caused by the landslides. The research was conducted in GIS based processing, by collecting secondary data supported by field observations and quantitative analysis to produce the landslide hazard map. Slope gradient, geology, soil type, and rainfall are the parameters used to determine the landslide susceptibility zonation in the research area. These parameters are then processed using a weighted overlay method. The zoning results show most of Samarinda is included in the intermediate landslide hazard zone, followed by the high landslide hazard zone, and the low landslide hazard zone which has the narrowest distribution. The high landslide hazard zone has a distribution associated with geological structures identified as fold which are included in the Samarinda anticlinorium and thrust fault in north-south direction. The distribution of the landslide hazard zones indicates that the slope gradient, lithology which consist of sedimentary rock, and fold and fault structures, are the main controlling factors for landslides in Samarinda.
Clay Mineral Identification for the Utilization of the Brick Industry in Samarinda using X-Ray Diffraction (XRD) Analysis Raharjanti, Ni'matul Azizah; Ismunandar, Wisnu; Sutan, Syamsidar; Andhika, Muhammad Wira; Priatama, Muhammad Haykal Bayu
Jambura Geoscience Review Vol 6, No 2 (2024): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v6i2.21524

Abstract

The clay minerals occurrences can be utilized into various products, including bricks. Brick industry often used the materials taken from the local area. The objective of the research is to identify the lithology of the brick material as well as the mineral consist in the soil or material, including clay mineral. The analysis is carried out in field observation and X-Ray Diffraction (XRD) analysis. The analysis resulting the lithology of the research area is predominantly sandstone and the bricks material is taken from the clayey soil part of from the quartz sandstone lithology. The quartz sandstone predominantly composed by quartz (97%) and plagioclase as minor mineral (3%). The analysis of the clay soil sample in quartz sandstone layer which used as the main component of the brick showing that the minerals composition are mainly quartz (95%) and plagioclase as minor mineral (3%), while the clay mineral that detected is kaolinite (2%). The formation of the kaolinite is interpreted as the result of the weathering of plagioclase trough hydrolysis process. From those data, it is identified that the brick in the research area mainly composed by quartz and clay mineral as kaolinite is formed in just minor abundance.
VULKANOSTRATIGRAFI KOMPLEK VULKANIK GUNUNG WILIS BAGIAN BARAT, KABUPATEN PONOROGO, PROVINSI JAWA TIMUR Ismunandar, Wisnu; Raharjati, Ni'matul Azizah; Yudiantoro, Dwi Fitri
Bulletin of Scientific Contribution Vol 22, No 3 (2024): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v22i3.54247

Abstract

Komplek Vulkanik Gunung Wilis Bagian Barat merupakan bagian dari Gunungapi Wilis serta bagian dari gunung api Kuarter aktif yang berada di busur gunung api Sunda. Aktivitas vulkanisme Gunungapi Wilis dapat dipelajari dari aspek vulkanostratigrafinya. Tujuan penelitian ini adalah untuk menjelaskan urutan stratigrafi batuan dan sejarah vulkanisme dari fase pembentukan Komplek Vulkanik Gunung Wilis Bagian Barat. Metodologi penelitian yang digunakan dalam penelitian ini menggunakan pemetaan geologi permukaan, pengukuran stratigrafi, dan analisis petrografi. Berdasarkan deskripsi litologi lapangan, litologi dibedakan menjadi 16 satuan batuan berupa piroklastik jatuhan, piroklastik aliran, aglomerat, dan batuan beku vulkanik yang mewakili masing – masing fase pembentukan gunung api. Adapun dijumpai adanya struktur geologi berupa sesar mendatar kiri yang mengontrol munculnya manifestasi panasbumi berupa mata air panas yang berkembang pada bagian Tenggara daerah penelitian. Satuan vulkanostratigrafi daerah Komplek Vulkanik Gunung Wilis Bagian Barat secara berurutan dari tua ke muda diklasifikasikan kedalam Gumuk Jeding, Gumuk Kemlandingan, Gumuk Manyutan, dan Gumuk Ngebel yang dapat mewakili terkait proses evolusi vulkanisme daerah telitian yang ditandai dengan proses fase destruktif dan konstruktif. Adapun kehadiran pola umum perubahan kandungan mineral hasil analisis petrografi yakni berdasarkan karakteristik batuan piroklastik dan batuan beku vulkanik yang memiliki sifat pola basa hingga menuju asam seiring berkembangnya evolusi vulkanismenya.
Penentuan Area Bahaya Tanah Longsor Menggunakan Pendekatan SIG (Sistem Informasi Geografis) Dengan Metode Weighted Overlay Di Kawasan Ikn Ismunandar, Wisnu; Alam, Fajar; Luthfi, Akmal Faiq
Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri 2022: Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri
Publisher : Universitas Muhammadiyah Surakarta

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

Abstract

Rencana pengembangan pemukiman dan infrastruktur penunjang dalam pembangunan ibu kota negara yang baru hendaklah berbasis tata ruang kebencanaan. Hal ini merujuk kepada fakta bahwa Indonesia merupakan negara dengan potensi kebencanaan yang tinggi. Bencana tanah longsor merupakan salah satu jenis bencana yang paling sering terjadi di Indonesia. Oleh karena itu diperlukan analisis terkait bahaya longsor di kawasan IKN. Penelitian dilakukan dengan menghimpun data primer dan data sekunder yang kemudian dilakukan pendekatan analisis kuantitatif berupa metode Weighted Overlay untuk memetakan potensi bahaya longsor tersebut. Beberapa parameter yang digunakan dalam penentuan potensi bahaya longsor tersebut antara lain adalah kondisi kelerengan, geologi (jenis batuan dan struktur geologi), jenis tanah, dan hidrologi (curah hujan). Hasil zonasi menunjukkan bahwa kawasan IKN sebagian besar termasuk dalam zona bahaya longsor pada tingkat sedang dan rendah. Zona bahaya longsor sedang hingga sangat tinggi memiliki penyebaran yang berasosiasi dengan sebagian struktur geologi berupa patahan dengan arah umum berarah timurlaut – barat daya.
Co-Authors Alam, Fajar Andhika, Muhammad Wira Demi Ganjar Sampurno Dewi Sri Sayudi Dwi Fitri Yudiantoro Dyah Rini Ratnaningsih Intan Paramita Haty Isao Takashima Luthfi, Akmal Faiq Mahreni Mahreni Mirzam Abdurrachman Priatama, Muhammad Haykal Bayu Puji Pratiknyo Raharjanti, Ni'matul Azizah Raharjati, Ni'matul Azizah Richzkey Muhammad Sutan, Syamsidar