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All Journal Jurnal Ilmiah MTG Techno LPPM Journal of Geoscience, Engineering, Environment, and Technology Angkasa: Jurnal Ilmiah Bidang Teknologi Prosiding Seminar Teknologi Kebumian dan Kelautan (SEMITAN Journal of Applied Sciences, Management and Engineering Technology (JASMET) Tanah Goyang: Jurnal Geosains Tanah Goyang : Journal of Geoscience Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Agus Harjanto
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Aerospace Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics

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KONSERVASI LERENG BARAT LAUT GUNUNG SLAMET DAN IDENTIFIKASI MANIFESTASI AIR PANAS DAERAH GUCI, TEGAL, JAWA TENGAH Arhananta, Arhananta; Rkt, Anggita Mahyudani; Barizi, Antu Ridha Falkhan; Ahmad, Oscarino; Kurniawan, Riko Dwi; Harjanto, Agus
Prosiding Seminar Teknologi Kebumian dan Kelautan Vol 1, No 1 (2019)
Publisher : Prosiding Seminar Teknologi Kebumian dan Kelautan

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Abstract

Penelitian mengenai panas bumi Gunung Slamet dalam rentang tahun 2006-2019 membahas tentang survey 3G (Geologi, Geofisika, Geokimia), tetapi belum ada yang membahas mengenai identifikasi manifestasi panas bumi daerah Guci, Tegal, Jawa Tengah serta kaitannya dengan konservasi airtanah. Metode penelitian terdiri atas interpretasi citra, data geofisika sekunder meliputi data magnetotellurik, kemudian dilanjutkan dengan fieldcheck dan pengambilan conto batuan. Terakhir dilakukan pembuatan model geologi tiga dimensi, dan peta zonasi konservasi. Lereng Barat Laut gunung Slamet termasuk dalam DAS Pemali yang memiliki kelerengan datar sampai landai pada daerah imbuhan (recharge area) Slamet 0,36 km3. Luasan itu digunakan untuk zonasi konservasi airtanah pembuatan sumur resapan.  Berdasarkan pengamatan citra manifestasi terletak pada Gunungapi Slamet Tua membentuk morfologi lereng dan kaki gunungapi dengan tekstur kasar, dan terdapat pola patahan tertentu yang berarah baratlaut-tenggara yang memotong tubuh Gunung Slamet Tua.. Prospek guci bagian utara berasosiasi dengan produk G.Mingkrik, diperkirakan sebagai kaldera besar yang terpotong dengan arah sesar barat laut – tenggara yang kemudian ditutupi oleh produk lava muda dari gunung slamet. . Kelurusan dari struktur berarah barat laut - tenggara umumnya mengendalikan aktivitas Gunung tua Slamet atau Kompleks Mingkrik Berdasarkan interpretasi data sekunder Radon diinterpretasikan bahwa area Guci memiliki permeabilitas tinggi, Konsentrasi gas Radon tinggi mengindikasikan adanya media migrasi gas Radon ke permukaan. Manifestasi air panas di Guci terletak pada kelurusan struktur berarah barat laut-tenggara menurut resistivitas dan magnetotellurik yang diinterpretasikan sebagai sesar normal.
KARAKTERISTIK MANGAN (Mn) DI DAERAH SIPUL DAN SEKITARNYA, KECAMATAN NIKI-NIKI KABUPATEN SOE, PROPINSI NUSA TENGGARA TIMUR Agus Harjanto; C. Danisworo
Jurnal Ilmiah MTG Vol 6, No 1 (2013)
Publisher : Magister Teknik Geologi Program Pascasarjana UPN ”Veteran” Yogyakarta

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Daerah penelitian terletak di daerah Sipul dan sekitarnya, Kecamatan Niki-Niki, Kabupaten Soe. Secara administrasi terletak ke dalam UTM WGS 84 zona 51 L dengan koordinat x = 610000 – 628500 dan y = 8896500 – 8918000. Luas daerah penelitian sekitar 18,5 km x 21,5 km = 397,75 km2.Geologi daerah penelitian didominasi oleh batuan sedimen berumur antara Kapur Akhir - Miosen. Batuan sedimen tersebut termasuk dalam Formasi Ofu yang terdiri dari kalsilutit, rijang, kalsedon, metasidimen dan terdapat mineralisasi mangan berupa berlapis (platten). Pada daerah telitian terdapat 6 satuan batuan yaitu Satuan Alluvium, Satuan Batuan Konglomerat – Krakal, Satuan Batuan Napal, Satuan Batuan kalsilutit tuffan, Satuan Batuan Batugamping koglomeratan dan satuan Batugamping Kalsilutit.Karakteristik mangan di daerah Sipul termasuk dalam jenis mangan pirolusit dan psilomelan. Selain itu mangannya berupa lapisan-lapisan tipis pada Formasi Ofu dan berhubungan dengan proses sistem hydrothermal di daerah penelitian.Kata kunci : mangan, Formasi Ofu, system hidrotermal
PETROLOGI DAN GEOKIMIA BATUAN VOLKANIK DI DAERAH KULONPROGO DAN SEKITARNYA DAERAH ISTIMEWA YOGYAKARTA Agus Harjanto
Jurnal Ilmiah MTG Vol 4, No 1 (2011)
Publisher : Jurusan Teknik Geologi Fakultas Teknologi Mineral UPN "Veteran" Yogyakarta

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Abstract

Daerah penelitian secara administrasi terletak di Kabupaten Kulon Progo, Propinsi Daerah Istimewa Yogyakarta dan Kabupaten Purworejo, Propinsi Jawa Tengah. Secara geografis daerah penelitian berada pada 110°00’00” BT - 110°15’02” BT dan 7°35’00” LS – 7°50’30” LS, dengan luas 32 x 32 km2.Geologi daerah penelitian didominasi oleh batuan volkanik berumur antara Oligosen-Miosen. Batuan volkanik tersebut termasuk dalam Formasi Andesit tua yang terdiri dari breksi volkanik, tuff, andesit, dasit dan diorit. Selain itu batuan volkanik juga termasuk dalam Busur magmatik Sunda-Banda.Batuan volkanik ini mempunyai komposisi kimia antara andesit basaltik sampai dasit dan termasuk seri batuan kalk alkali. Fenokris batuan terdiri dari piroksen, hornblende, plagioklas, felspar alkali dan kuarsa. Busur magmatik yang dihasilkan secara umum berarah timurlaut-baratdaya, berafinitas kalk - alkali dan berhubungan dengan lingkungan tektonik tansisional antara Busur Kepulauan dengan Tepian Benua AktifKata kunci : busur magmatik, formasi andesit tua, afinitas, busur kepulauan
VULKANOSTRATIGRAFI DI DAERAH KULON PROGO DAN SEKITARNYA, DAERAH ISTIMEWA YOGYAKARTA Agus Harjanto
Jurnal Ilmiah MTG Vol 4, No 2 (2011)
Publisher : Jurusan Teknik Geologi Fakultas Teknologi Mineral UPN "Veteran" Yogyakarta

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Abstract

Daerah penelitian secara administrasi merupakan perbatasan antara Kabupaten Kulon Progo, Propinsi Daerah Istimewa Yogyakarta dan Kabupaten Purworejo, Propinsi Jawa Tengah. Secara geografis daerah penelitian adalah 110°00’30” BT - 110°23’00” BT dan 7°35’00” LS – 7°55’30” LS. Sedangkan luas daerah telitian 32 x 32 km2.Aktifitas volkanisme di daerah Kulon Progo terjadi dua kali periode. Pertama magmatisme yang mempunyai kisaran umur 29,63-22,64 juta tahun yang lalu (Oligosen Akhir-Miosen Awal) (Soeria-Atmadja dkk.,1994). Kedua magmatisme terjadi antara 8,10–1,19 juta tahun yang lalu (Miosen Akhir–Kuarter) berupa intrusi mikro diorit Telu dan dasit Curug.Hasil analisis dari pengamatan citra satelit, peta topografi, deliniasi punggungan dan pengecekan di lapangan, didapatkan empat bekas pusat erupsi yang ditandai oleh penampakan leher volkanik dan satu bekas kaldera dimana reliknya sebagai akibat proses erosi intensif yang berlangsung lama. Kelima pusat erupsi tersebut dikelompokkan menjadi tiga pusat erupsi utama yaitu Khuluk Ijo, Khuluk Jonggrangan dan Khuluk Sigabug serta dua pusat erupsiparasiter yang dimasukkan dalam satuan Gumuk gunung api yaitu Gumuk Kukusan dan Gumuk Pencu. Selain itu terdapat dua intrusi yaitu intrusi dasit Curug dan intrusi mikro diorit Telu.Kata kunci : busur magmatik, formasi andesit tua, khuluk, gumuk
Geochemical Correlation of Volcanic Rocks and Groundwater Quality in the Todoko-Ranu Complex, Sahu District, West Halmahera, North Maluku, Indonesia Laratmase, Lotong; Kusumayudha, Sari Bahagiarti; Harjanto, Agus
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 3 (2024): JGEET Vol 09 No 03 : September (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.3.15295

Abstract

The research area is located in the Mount Todoko-ranu complex and its surroundings, Sahu District, West Halmahera Regency, North Maluku, Indonesia. This area geologically consists of Quaternary volcanic rocks with various petrochemical composition. On the other hand, natural water found in the research area generally physically appears turbid, while people who take water from this sites actually need clean water. As it is known, groundwater quality is influenced by the geochemistry of the aquifer through which it flows, therefore it is important to conduct a study on the geochemical correlation of volcanic rocks and groundwater quality in the research area. Thus, the aim of this research is to examine the geochemical characteristics of Mount Todoko-Ranu complex volcanic rocks, to analyze groundwater quality, and to study the correlation between the geochemical characteristics of rocks and the quality of groundwater in this volcanic complex. Methodology applied in this study was geological mapping, rock samples testing to determine the mineralogy chemical composition, groundwater, and surface water samples testing to identify their quality, and then correlation analysis. The results show that andesitic and basaltic-andesite of calc-alcaline volcanic rock complex is correlative to no dominant cation, but bicarbonate anion, or mixing type of natural water.
Fasies gunungapi, dan evolusi magmatik berdasarkan analisis geokimia Kompleks Todoko-Ranu, Kecamatan Sahu, Halmahera, Maluku Utara Kusumayudha, Sari Bahagiarti; Laratmase, Lotong; harjanto, Agus
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 17, No 1 (2025): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v17i1.2637

Abstract

The Todoko-Ranu volcanic complex is situated in the Sahu District, West Halmahera Regency, North Maluku. Geomorphologically, this area shows various volcanic landforms, reflecting the development and changes in the characteristics of eruptive activities. Eruption characteristic of a volcano is influenced by the physical and chemical properties of magma. Todoko-Ranu volcanic complex was built by volcanic products, including lava deposits, pyroclastic deposits and lahar deposits, which have different geochemical compositions. Due to the variety compositions of rocks, it is important to carry out studies on magmatic evolution based on geochemical analysis in the area. This study is useful for knowing the characteristics of the eruption at that time. Thus, the aim of this research is to study and analyze the geochemistry of volcanic rocks in order to determine the magmatic evolution of the Todoko-Ranu volcanic complex. The method applied is mapping the distribution of rocks and geological structures, testing rock samples for petrographic analysis and geochemical analysis, then studying magmatic processes. The results of the study show that the volcanic rocks of the Todoko-Ranu complex originate from calc-alcaline and tholeiitic magma which was formed from oceanic plate partial melting in a convergent tectonic environment, then underwent an evolution from alkaline to more acidic due to the process of magma differentiation and assimilation.
Geology And The Effect Of Boulder Size Concretion To Bauxite Laterite Deposit Quality At Djanra Area, Sandai District, Ketapang Regency, West Kalimantan Sutarto, Sutarto; Harjanto, Agus; Kurniawan, Paschalis Pindyka Aji
Journal TECHNO Vol. 8 No. 2 (2022): November
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/journal techno.v8i2.7528

Abstract

The research area is located in Djanra areas Sandai District, Ketapang Regency, West Kalimantan. The research methods used are surface geological mapping, bauxite sample collection, also studio and laboratory analysis. Laboratory analysis includes petrographic analysis, XRF, and wet analysis. The geomorphology of the study area is dominated by denudational and anthropogenic landforms as a result of mining activities. The constituent rocks are Kerabai andesite units which are Middle-Late Cretaceous and are intruded by Sukadana trachyte units which are of Late Cretaceous period. The geological structures found are a shear joint with the main southwest-northeast direction and the normal right slip fault. Bauxite laterite deposits in the research area have varying overburden and ore thicknesses. Distribution of concretion size of boulder to depth in the study area varies. Based on the results of the study, the boulder size concretion can affect the quality of bauxite laterite deposits. Where on DJANRA-1 hill is declared feasible to be taken and mixed with smaller concretions because it meets quality standards.
Geology And Geological Models Of Nickel Laterite Deposit Gag Island, West Waigeo District, Raja Ampat Regency, West Papua Province Harjanto, Agus; Prasongko, Bambang Kuncoro; Santoso, Joko; Hadi, Waluyo; karlina, Nur Alif Yusuf Putra
Journal TECHNO Vol. 8 No. 2 (2022): November
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/journal techno.v8i2.8217

Abstract

The location of the research is on Gag Island, West Waigeo District, Raja Ampat Regency, West Papua Province which is the area of PT. Nickel Gag. Based on the research flow chart, there are 3 main stages, namely data acquisition, data analysis, and synthesis. Physiography Gag Island is part of North Maluku (Northern Moluccas) which is included in the Raja Ampat Group. The drainage pattern found in the study area is the sub-dendritic alteration flow pattern (SDND). Geomorphology in the study area found denudational hills consisting of weak undulating hills D1, strong D2, and strongly eroded valleys D3. Lithology in the study area consists of 3 rock units, namely peridotite unit (Jp), dunite unit (Jd), and serpentinite unit (Js). The geological structure in the study area consists of the left horizontal fault of Gag 1 and 2, the right horizontal fault of Gag, paired joints, and veins. The geological model of Gag Island nickel laterite deposit consists of a bedrock model that affects the quality of nickel laterite deposits with a grade of 2-1.8% in harzburgite and dunite rocks; a slope model that affects laterite thickness with very gentle-slightly steep slopes >22 meters thick on harzburgite lithology; the geological structure model that influences the permeability of the bedrock with the presence of garnierite and chrysoprase mineralization in the fracture and help the leaching process. The exploration model is an application or application of a scientifically based geological model, besides that the exploration model is used as a command in finding exploration targets. Geological clues are used as an approach to search for nickel laterite deposits in the form of indications of flow patterns, geomorphology, lithology, geological structures, magmatogenic, and surrounding relationships.
Geology And The Correlation Between Geological Control And Nickel Quality In Gag Island, Raja Ampat Islands, West Papua Prasongko, Bambang Kuncoro; Harjanto, Agus; Askaria, Muhammad Ghifary
Journal TECHNO Vol. 8 No. 2 (2022): November
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/journal techno.v8i2.8218

Abstract

The geology of Gag Island, Raja Ampat Islands, West Papua Province is composed of volcanic rocks and ultramafic rocks as carriers of laterite nickel deposits (Supriatna, et al. 1995). The research was conducted by surface mapping supported by drill data, and drill geochemical data. Data collection by surface mapping aims to determine the relationship of geological control to the quality of laterite nickel. The characteristics of laterite nickel deposits are influenced by geological factors in the form of lithology, topography, Drainage drainage, tectonics, and geological structures (Elias, 2002), so that geological control of the quality of laterite nickel deposits needs to be studied further.The research area found 3 rock units in the form of peridotite unit (harzburgite), serpentinite unit, and alluvial deposit unit. The data shows that the highest nickel content is in peridotite (harzburgite) units. In addition, the shape of the land based on the geomorphological aspect shows that in the form of weak wavy hills, laterite deposits are quite well developed and thick. The landform is supported by a relatively sloping slope (0-8 o ) with an undulating morphology and a dendritic Drainage pattern with a content of > 1.5% Ni and a thickness of 9-16 meters, while levels of < 1.5% Ni reach a thickness of 5-22 meters. The geological structure in the morphology is only found in the form of paired joints and filled joints. These joints become an important component in the process of garnierite mineralization as a carrier of Ni.
Hydrothermal Alteration and Mineralization in the Grindulu River Segment, Pacitan, East Java: A Study of the Geotourism Potential of the River Area Mineralization Kurniawan, Oki; Purwanto, Heru Sigit; Harjanto, Agus; Winarno, Edy; Fatchurohman, Dedi; Pratomo, Septyo Uji
Journal of Applied Sciences, Management and Engineering Technology Vol 6, No 2 (2025)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jasmet.2025.v6i2.8192

Abstract

The Grindulu River in Pacitan is one of the areas that exhibits manifestations of hydrothermal alteration and metal mineralization. However, the valuable metals found are relatively low, making it less economical to produce. This condition opens up other opportunities by utilizing the area as a natural laboratory for geological education and sustainable geotourism development. This study evaluates the potential for hydrothermal mineralization-based geotourism through geosite assessment. The study area comprises the Watupatok Formation and the Arjosari Formation, which show silicic, argillic, and propylitic alteration zones. The research methods include geological mapping, rock sampling, petrographic analysis, XRD, FA-AAS, and geosite assessment using the Kubalikova method, covering scientific, educational, aesthetic, and value-added aspects. The results show the presence of mineralization in the form of pyrite, chalcopyrite, sphalerite, and galena, with low levels of valuable metals (Au, Ag, Cu, Pb, Zn). Nevertheless, all three segments of the Grindulu River possess significant geosite value for educational and conservation purposes, with segment 2 considered the most ideal due to its superior accessibility and educational value. This study concludes that the Grindulu River is more appropriate for development as a sustainable geotourism destination based on conservation and geological education rather than mining exploitation.
Co-Authors Achmad Subandrio, Achmad Ahmad, Oscarino Arhananta, Arhananta Askaria, Muhammad Ghifary Barizi, Antu Ridha Falkhan C. Danisworo Edy Winarno Fatchurohman, Dedi Hartono, Gia Helmi, Hurien Heru Sigit Purwanto I Gde Basten, I Gde Joko Santoso Joris, Kezia Karlina, Nur Alif Yusuf Putra Kurniawan, Oki Kurniawan, Paschalis Pindyka Aji Kurniawan, Riko Dwi Kusumayudha, Sari Bahagiarti Laratmase, Lotong Muhammad Fauzi Prasongko, Bambang Kuncoro Pratomo, Septyo Uji Rkt, Anggita Mahyudani Rosdiana Rosdiana Salamat, Juanito Saputra, Putu Suasa, I Made Sutanto Sutanto Sutarto Sutarto Waluyo Hadi