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All Journal Jurnal Ilmiah MTG Jurnal Ilmiah Dinamika Rekayasa (DINAREK) Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geosains dan Teknologi Jambura Geoscience Review Prosiding Seminar Teknologi Kebumian dan Kelautan (SEMITAN Journal of Earth and Marine Technology (JEMT) Journal of Applied Sciences, Management and Engineering Technology (JASMET) Journal of Applied Geology Jurnal Ilmiah Geologi pangea Jurnal Ilmiah Geomatika Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)

Pratomo, Septyo Uji

Teknik Geologi UPN Veteran Yogyakarta

Author-ID : 1785060

Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics Transportation

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Studi Hidrogeologi dan Distribusi Salinitas Airtanah di Daerah Pesisir Kecamatan Ambal Kabupaten Kebumen Jawa Tengah Ra Mauldy Pabhayita Noval; Septyo Uji Pratomo; Thema Arrisaldi
Jurnal Ilmiah Geologi PANGEA Vol 10, No 2 (2023): 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.v10i2.11182

Abstrak – Air tanah yang telah mengalami peningkatan salinitas dapat dipengaruhi salah satunya oleh kegiatan manusia, terutama di area pesisir. Penurunan ketersediaan air tanah yang disebabkan oleh peningkatan aktivitas manusia di di area pesisir mengakibatkan masuknya air sungai (muara) atau bahkan air laut ke dalamnya sehingga mempengaruhi air tanah yang berubah menjadi asin. Tujuan dari penelitian ini adalah untuk menentukan distribusi salinitas air tanah di wilayah pesisir Kecamatan Ambal, Kabupaten Kebumen yang mencakup 11 desa. Analisis data dilakukan menggunakan data utama, dengan melakukan pengukuran langsung pada sumur penduduk di Kecamatan Ambal, Kabupaten Kebumen. Pengukuran mencakup data suhu, pH, Total Dissolved Solids (TDS), dan konduktivitas listrik (EC) dari 43 sampel air sumur, serta pengujian kadar klorida (Cl-) dari 6 sampel air sumur penduduk. Hasil penelitian menunjukkan bahwa di Kecamatan Ambal, Kabupaten Kebumen, pH berada dalam kisaran 5,00 hingga 6,14, EC berkisar antara 168 µS/cm hingga 1.287,33 µS/cm, TDS berkisar dari 84 ppm hingga 640,33 ppm, dan salinitas air berkisar antara 0,0134458‰ hingga 0,1740686‰. Salinitas air tanah tertinggi terdapat di bagian utara wilayah penelitian, dengan kandungan TDS mencapai 1.287,33 ppm. Berdasarkan analisis dan interpretasi data lapangan, dapat disimpulkan bahwa kondisi salinitas air tanah di area pesisir Kecamatan Ambal berada dalam rentang kadar salinitas air tawar dan tidak dipengaruhi oleh intrusi air laut. Kata Kunci: salinitas, air tanah, Ambal, Kebumen Abstract – Groundwater that has experienced increased salinity can be influenced by human activities, especially in coastal areas. The decreased groundwater availability caused by increased human activity in coastal areas results in the entry of river water (estuaries) or even seawater, causing the groundwater to turn salty. This research aims to determine groundwater salinity distribution in the coastal area of Ambal District, Kebumen Regency, which includes 11 villages. Data analysis was carried out using primary data by taking direct measurements on residents' wells in Ambal District, Kebumen Regency. Measurements include data on temperature, pH, Total Dissolved Solids (TDS), and electrical conductivity (EC) from 43 well water samples, as well as testing chloride (Cl-) levels from 6 resident well water samples. The results showed that in Ambal District, Kebumen Regency, pH was in the range of 5.00 to 6.14, EC ranged from 168 µS/cm to 1,287.33 µS/cm, TDS ranged from 84 ppm to 640.33 ppm, and water salinity ranges from 0,0134458‰ to 0.1740686‰. The highest groundwater salinity is found in the northern part of the research area, with TDS content reaching 1,287.33 ppm. Based on the analysis and interpretation of field data, it can be concluded that the groundwater salinity conditions in the coastal area of Ambal District are within the range of freshwater salinity levels and did not influenced by sea water intrusion. Keywords: salinity, groundwater, Ambal, Kebumen

The Influence of Hydrogeological Conditions on Salt Quality Standards In Ambal District, Kebumen Regency, Central Java Radityo, Daniel; Pratomo, Septyo Uji
Jambura Geoscience Review Vol 6, No 1 (2024): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v6i1.22943

Salt (NaCl), also known as halite, has a vital role as an essential ingredient in human life and industry. Kebumen Regency in Central Java, especially along the south coast in Ambal District, is one of the area in Indonesia that produces salt, originating from elongated dome-shaped salt ponds, which are the primary source of salt production in the region. Salt quality standards are regulated by SNI 3556:2016, which provides limits for metal contamination such as cadmium (Cd) 0.5 mg/kg, lead (Pb) 10 mg/kg, mercury (Hg) 0.1 mg/kg, and arsenic (As) 0.1 mg/kg. The conditions of seawater and groundwater used in the salt production process have a significant impact on the quality of the salt produced, which can be determined from hydrogeological studies. The results of measuring residents' wells at 43 points show that the depth of the groundwater level ranges from 4.4 to 14.75 meter below sea level. The results of salt analysis from 2 different salt ponds showed Cd levels ranging between 0.0949â€”0.1001 mg/kg, Pb between 0.5163â€”0,755 mg/kg, Hg between 0.01198â€”0.06203 mg/kg, and negative As levels; with water content ranging from 14.43-14.92% w/w and NaCl content between 72.3-85.8%. The analysis of well water and seawater from 3 samples showed Cd 0.0009 mg/kg, Pb 0.0011-0.0098 mg/kg, Hg 0.0001 mg/kg, and As 0.001 mg/kg. The results of groundwater level mapping show that hydrogeological conditions influence the quality standards for salt on the southern coast of Kebumen, especially by the significant grain size factor that carries groundwater and the elements dissolved in it. Meanwhile, salt produced from 2 salt ponds in Ambal District did not meets quality standards based on SNI 3556:2016.

Identifikasi Zona Mineralisasi Dan Struktur Pengontrol Skarn Cu Daerah Sulit Air, Kabupaten Solok, Provinsi Sumatera Barat Afrilita, Afrilita; Idrus, Arifudin; Pambudi, Setia; Pratomo, Septyo Uji
Jurnal Ilmiah Geomatika Vol 2, No 2 (2022): Oktober Jurnal Ilmiah Geomatika
Publisher : Program Studi Teknik Geomatika Fakultas Teknologi Mineral Universitas Pembangunan Nasional

Endapan skarn merupakan salah satu dari beberapa endapanhidrotermal yang menghasilkan endapan bijih yang bernilai ekonomis. Mineralisasi skarn Cu pada daerah Sulit Air sudah diketahui sejak lama, namun belum banyak penelitian rinci yang membahas tentang kontrol struktur geologi terhadap penyebaran alterasi dan mineralisasi di daerah ini. Penelitian ini membahas tentang identifikasi zona mineralisasi dan kontrol struktur geologi terhadap pola penyebaran alterasi dan mineralisasi skarn Cu. Metodologi yang digunakan yaitu analisis citra DEM dan pemetaan geologi permukaan. Zona alterasi skarn Cu terbagi kedalam empat zonasi yaitu zona piroksen-K-feldspar-klorit-epidot, zona garnet-piroksen, zona piroksen-kuarsa, dan zona garnet-wollastonit-piroksen. Mineralisasi dominan hadir pada zona alterasi garnet-wollastonit-piroksen dan zona garnet-piroksen. Mineral utama pembawa Cu berupa bornit, kalkosit, malakit, azurit dan kalkopirit. Penyebaran alterasi mengikuti pola intrusi dan sesar-sesar mendatar lokal. Zona alterasi ini mengikuti sesar mendatar kiri yang berarah utara-selatan (N-S) sedangkan zona mineralisasi mengisi rekahan-rekahan pada zona sesar mendatar kiri yang berarah utara-selatan (N-S) dan barat laut-tenggara (NW-SE). Kekar pada zona sesar terisi oleh mineral-mineral kalsit, kuarsa dan azurit yang dominan berarah berarah barat laut-tenggara dan timur laut-barat daya.

Paragenesis Mineral Bijih pada Endapan Epitermal Sulfidasi Tinggi Area Gunung Budheg, Kabupaten Tulungagung, Provinsi Jawa Timur Pratomo, Septyo Uji
Jurnal Geologi dan Sumberdaya Mineral Vol. 25 No. 2 (2024): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v25i2.772

Tujuan dilakukannya penelitian ini adalah untuk mengetahui paragenesis mineral yang membentuk endapan epitermal sulfidasi tinggi. Lokasi penelitian terletak di daerah Gunung Budheg, Kecamatan Campurdarat, Kabupaten Tulungagung, Provinsi Jawa Timur. Metode penelitian yang digunakan antara lain: pengamatan megaskopis pada sampel batuan setangan (hand specimen) dan sampel slab, pengamatan mikroskopi bijih, dan geokimia (FA-AAS). Endapan epitermal sulfidasi tinggi pada area ini dicirikan dengan adanya tekstur vuggy pada zona silisifikasi yang terisi oleh mineral-mineral sulfida dengan tahap paragenesis: tetrahedrit, pirit, kalkopirit, bornit, dan galena, serta kovelit yang terbentuk pada tahap akhir sebagai hasil oksidasi yang berasosisasi dengan hematit. Hasil geokimia pada area ini menunjukkan kadar logam: Au berkisar antara 0,03—2,45 ppm, Ag <0,5—19 ppm, Cu 19—148 ppm, Pb <5—1.520 ppm, dan Zn <5—520 ppm. Kata kunci: epitermal sulfidasi tinggi, paragenesis mineral, Gunung Budheg, Tulungagung

Petrogenesis of Andesite Rocks in Datae Area, Sidenreng Rappang Regency, South Sulawesi Province Hayatuzzahra, Sayidatina; Pratomo, Septyo Uji
Journal of Earth and Marine Technology (JEMT) Vol 4, No 1 (2023)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2023.v4i1.4695

The research area is in the Datae Area, Watangpulu District, Sidenreng Rappang Regency, South Sulawesi Province. This study aims to determine the distribution of volcanic rocks, determine the crystallization phase based on petrographic analysis, and determine the type, magma affinity and tectonic environment based on geochemical data. The method used in this study was field data collection and rock sampling for analysis through petrographic analysis and geochemical analysis using the X-Ray Fluorescence (XRF) method by analysing the main elements, trace elements and rare earth elements (REE). The results of the petrographic analysis show that the rocks found in the field are volcanic breccia and ignimbrite. Volcanic breccia showed coarse-grained texture composed of angular to rounded andesite fragments and pyroclastic material fused together in a matrix. Meanwhile, ignimbrite showed fine grained texture with lapilli to boulder-sized fragments, poor sorting, open-packed and non-layered structure. Based on the Total Alkali Silika (TAS) diagram, AFM diagram, and binary diagram, the results of the geochemical analysis showed that the rocks found in the study area were andesite and trachy-andesite, while the magma affinity area is high-K calc-alkaline and shoshonitic. High-K calc-alkaline magmas are associated with subduction zones and are characterized by elevated levels of potassium and aluminum, while shoshonitic magmas are typically found in intraplate or back-arc settings, characterized by their distinctive potassium, sodium, and barium-rich compositions. The results from ternary diagram and geochemical Spider plots proved that the magma tectonic environment is island arc—continental arc basalt, indicating that the rock was formed in a subduction area. This research supports previous research regarding the tectonics of the western arm of Sulawesi, which stated that this area was formed by subduction.

Depositional Environment Characteristic of The Late Miocene Kerek Formation in Kendeng Basin: A Case from Cipluk Area, Kendal Regency, Central Java Ardine, Joseph Emmanuel; Pratomo, Septyo Uji; Prasetyadi, Carolus; Nugroho, M. Ocky Bayu; Rizky, Aga; Kristanto, Yohanes Citra; Manggala, I Nyoman Agus Dharma
Journal of Earth and Marine Technology (JEMT) Vol 4, No 1 (2023)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2023.v4i1.4830

This study focused on the Late Miocene Kerek Formation in Cipluk, Kendal Regency, Central Java, which belongs to the Kerek Formation, a lithostratigraphy unit characterized by Early Miocene - Late Miocene turbidite deposits. The research aims to comprehensively interpret the depositional environment characteristics of the Late Miocene Kerek Formation based on lithofacies, thin section analysis, and micropaleontological analysis. Gaining insights into facies characteristics and the depositional environment will offer novel perspectives for the exploration and development of oil and gas resources in the Kendeng basin. The methodology consists of data collection, analysis, and synthesis. Results indicate that the study area is dominated by classical turbidite facies, suggesting a distal zone with slow sediment settling. The analysis reveals that the Late Miocene Kerek Formation was deposited in a deep marine environment within the inner bathyal—outer bathyal bathymetry zone, specifically in the lower fan section of a submarine fan system. Based on the characteristics of existing deposits and facies, the deposition environment is identified as a fine-grained, mud-rich complex in an elongated submarine fan. These findings contribute to a better understanding of the Late Miocene depositional environment in the Kendeng Basin, Central Java.

A Hydrogeochemistry Analysis for Quality Determination of Shallow Karstic Groundwater in Western Tuban, Indonesia Pambudi, Setia; Sulistijo, Budi; Iskandar, Irwan; Yudiantoro, Dwi Fitri; Haty, Intan Paramita; Ekasara, Adam Raka; Afrilita; Yoni, Dian Rahma; Pratomo, Septyo Uji
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 04 (2024): JGEET Vol 09 No 04 : December (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.04.15926

Groundwater hydrogeochemistry and water quality assessment have been conducted in western Tuban, Indonesia, which is characterized by its karstic features based on physicochemical parameters (pH, electric conductivity, total dissolved solids, hardness, Ca2+, Mg2+, Fe3+, Mn2+, K+, Na+, Li+, NH4+, HCO3-, Cl-, SO42-, NO2-, and NO3-) from 25 shallow groundwater samples. The Piper diagram implies the groundwater is of HCO3–Ca+Mg type with some Na+K–SO4+Cl type meaning that the groundwater in Western Tuban is influenced by the silicate minerals weathering, the dissolution of carbonate lithology, and seawater intrusion. Durov diagram shows that the evolution of groundwater is influenced by ion exchange with clay minerals and by mixing with seawater. The Gibbs diagram indicates that the change in the chemistry and quality of groundwater is caused by a dominance of rock-water interaction in the Western Tuban. The water quality assessment based on the USSL and Wilcox diagrams indicates a high level of salinity and relatively low sodium, meaning that the suggested crops should have good salt tolerance, and the cultivated soil should still be able to handle the relatively low sodium level for irrigation.

Karakteristik Unsur Nikel berdasarkan Litologi, Mineralogi, dan Analisis Fraksi Butir pada Zona Saprolit di Lapangan “K”, Pulau Gebe, Kabupaten Halmahera Tengah, Provinsi Maluku Utara, Indonesia Imalianda, Nabila Putri; Pratomo, Septyo Uji; Sutarto, Sutarto; Darmawan, Petrus P. Abimanyu
Jurnal Geosains dan Teknologi Vol 7, No 2 (2024): Oktober 2024
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jgt.7.2.2024.111-122

Pulau Gebe, yang terletak di Kabupaten Halmahera Tengah, Provinsi Maluku Utara, merupakan salah satu wilayah dengan potensi endapan nikel laterit yang signifikan akibat proses pelapukan ultramafik yang intensif. Zona saprolit dalam endapan laterit ini menjadi fokus utama eksplorasi karena kandungan nikel yang bernilai ekonomis. Penelitian ini bertujuan untuk mengetahui karakteristik dan distribusi nikel serta unsur-unsur lainnya berdasarkan analisis litologi, mineralogi, dan analisis fraksi butir pada zona saprolit di lapangan “K”, Pulau Gebe, Kabupaten Halmahera Tengah, Indonesia. Metode penelitian yang dilakukan antara lain pemetaan geologi permukaan berskala 1:4.000 dan pengambilan sampel batuan, analisis deskriptif secara megaskopis, serta analisis kuantitatif dengan menggunakan X-ray Fluorescence (XRF). Berdasarkan pemetaan geologi, stratigrafi daerah penelitian terbagi menjadi dua satuan litodem, yaitu satuan litodem Peridotit Gebe dan satuan litodem Serpentinit Gebe dengan interpretasi struktur geologi berupa sesar mendatar menganan berarah baratlaut-tenggara. Hasil analisis laboratorium menunjukkan bahwa kadar nikel, besi, silikon, dan magnesium pada zona saprolit bervariasi tergantung pada ukuran fraksi butir, mineralogi, dan litologi dari bedrock. Pada ukuran butir yang lebih halus, terjadi pengayaan nikel yang signifikan, terutama di lokasi yang mengalami proses laterisasi lebih intensif. Hasil penelitian menunjukkan korelasi langsung antara litologi serta mineralogi bedrock dengan kadar nikel pada zona saprolit, dengan keberadaan garnierit yang meningkatkan kelayakan ekonomis di titik-titik tertentu. Litologi yang dominan di setiap lokasi, seperti peridotit dan serpentinit, serta variabilitas mineralogi, terutama mineral pembawa nikel, secara substansial mempengaruhi distribusi dan konsentrasi nikel.

Grain Maturity and Sedimentary Processes of the Early Miocene Semilir Formation, Ngoro-oro Gunungkidul, Yogyakarta Rizky, Aga; Isnani, Desi Kumala; Widada, Sugeng; Pratomo, Septyo Uji; Tony, Brian
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.v6i2.8185

The texture of sedimentary rocks is a fundamental aspect of sedimentation, reflecting the physical properties of particles and their relationships. Understanding rock texture is essential for interpreting depositional mechanisms and environments. Grain maturity represents a key property within sedimentary textures. The Early Miocene Semilir Formation is characterized by turbidite deposits with tuffaceous lithologies; however, the transport mechanism remains unclear. This study aimed to analyze the sedimentation process of the Semilir Formation by observing grain maturity. Granulometric analysis was conducted on three rock samples from the Ngoro-oro area, Gunungkidul Regency, Yogyakarta. The samples were ground, separated into size fractions, and statistically evaluated to determine quartiles, median diameter, sorting coefficient, skewness, and kurtosis. The results showed that the Semilir Formation consisted of immature grain sedimentary rocks, indicating that the sediments were deposited under moderate to high energy conditions. These findings suggest that the deposits were derived from a nearby source and were strongly influenced by volcanic slopes and underwater volcanic activity.Keywords: Grain maturity; Granulometric analysis; Sedimentary process; Semilir Formation

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

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 Afrilita Afrilita, Afrilita Afrilta Afrilita Aga Rizky Agus Harjanto Anastasia Dewi Titisari Apriliani, Siska Ardine, Joseph Emmanuel Arifudin Idrus Brigita Nadya Eman Budi Sulistijo Darmawan, Petrus P. Abimanyu Dian Rahma Yoni, S.T., M.T. Dwi Fitri Yudiantoro Edy Winarno Ekasara, Adam Raka Eman, Brigita Nadya Ezza Ray Raditya Prasetyo Fahrudin Yusuf Saputro Fatchurohman, Dedi Galih Purnama Parikesit Hayatuzzahra, Sayidatina Heru Sigit Purwanto Huzaely Latief Sunan Huzaely Latief Sunan I Nyoman Agus Dharma Manggala Idarwati Idarwati Idham Khaliq Yudhistira Imalianda, Nabila Putri Intan Paramita Haty Intan Paramita Haty Irwan Irwan Isnani, Desi Kumala Joseph Emmanuel Ardine Kasih Septiani Kristanto, Yohanes Citra Kurniawan, Oki M. Ocky Bayu Nugroho Manggala, I Nyoman Agus Dharma Nugroho, M. Ocky Bayu Pambudi, Setia Prasetyadi, Carolus Prasetyo, Ezza Ray Raditya Puthut Prihartono Ra Mauldy Pabhayita Noval Radityo, Daniel Rizky, Aga Sayidatina Hayatuzzahra Septiani, Kasih Setia Pambudi Siska Apriliani Sugeng Widada Sunan, Huzaely Latief Sutarto Sutarto Thema Arrisaldi Tony, Brian Yohanes Citra Kristanto Yoni, Dian Rahma

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