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All Journal IJOG : Indonesian Journal on Geoscience POROS TEKNIK Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir Jurnal Ilmiah Dinamika Rekayasa (DINAREK) Jurnal Ilmu Kebumian Teknologi Mineral (JIK TekMin) Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Eduscience : Jurnal Ilmu Pendidikan JURNAL PENDIDIKAN TAMBUSAI Indonesian Journal on Geoscience Indonesian Journal on Geoscience Journal of Earth and Marine Technology (JEMT) Jurnal Pendidikan dan Penciptaan Seni Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Jurnal Pengabdian Masyarakat Terapan
Fadlin Fadlin
Geological Engineering Department, Jenderal Soedirman University, Purbalingga 53371, Indonesia.
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Geochemical Signatures of Potassic to Sodic Adang Volcanics, Western Sulawesi: Implications for Their Tectonic Setting and Origin Godang Shaban; Fadlin Fadlin; Bambang Priadi
Indonesian Journal on Geoscience Vol 3, No 3 (2016)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.3.3.195-214

Abstract

DOI:10.17014/ijog.3.3.195-214The Adang Volcanics represent a series of (ultra) potassic to sodic lavas and tuffaceous rocks of predominantly trachytic composition, which forms the part of a sequence of Late Cenozoic high-K volcanic and associated intrusive rocks occurring extensively throughout Western Sulawesi. The tectonic setting and origin of these high-K rocks have been the subject of considerable debates. The Adang Volcanics have mafic to mafitic-intermediate characteristics (SiO2: 46 - 56 wt%) and a wide range of high alkaline contents (K2O: 0.80 - 9.08 %; Na2O: 0.90 - 7.21 %) with the Total Alkali of 6.67 - 12.60 %. Al2O3 values are relatively low (10.63 - 13.21 %) and TiO2 values relatively high (1.27 - 1.91 %). Zr and REE concentrations are also relatively high (Zr: 1154 - 2340 ppm; Total REE (TREY = TRE): 899.20 - 1256.50 ppm; TRExOy: 1079.76 - 1507.97 ppm), with an average Zr/TRE ratio of ~ 1.39. The major rock forming minerals are leucite/pseudoleucite, diopside/aegirine, and high temperature phlogopite. Geochemical plots (major oxides and trace elements) using various diagrams suggest the Adang Volcanics formed in a postsubduction, within-plate continental extension/initial rift tectonic setting. It is further suggested magma was generated by minor (< 0.1 %) partial melting of depleted MORB mantle material (garnet-lherzolite) with the silicate melt having undergone strong metasomatism. Melt enrichment is reflected in the alkaline nature of the rocks and geochemical signatures such as Nb/Zr > 0.0627 and (Hf/Sm)PM > 1.23. A comparison with the Vulsini ultrapotassic volcanics from the Roman Province in Italy shows both similarities (spidergram pattern indicating affinity with Group III ultrapotassics volcanics) and differences (nature of mantle metasomatism).
Komatiitic Lamprophyre in West Sulawesi: First Evidence for >1350°C and 3.5 - 3.8 GPa Mantle Melts Shaban Godang; Fadlin Fadlin; Bambang Priadi; Arifudin Idrus; I Gde Sukadana
Indonesian Journal on Geoscience Vol 8, No 1 (2021)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.8.1.39-58

Abstract

DOI: 10.17014/ijog.8.1.39-58The presence of lamprophyric lavas of Late Cenozoic in Talaya Volcanic Formation at the boundary between the subregencies of Mamuju and Tabulahan (Western Sulawesi) associated with the mantle enrichment rocks of the Adang Volcanics is the subject of this study. Petrologically, lamprophyre is composed of orthopyroxene (enstatite), clinopyroxene (augite), biotite, leucite, amphibole, magnetite, and autometasomatism of chlorite in grain minerals and groundmass. The lamprophyre is classified into monchiquite shoshonitic lamprophyre, and it has a komatiitic composition with the ratio of MgO/Al2O3 > 0.7906 (in wt %). The komatiitic monchiquite lamprophyre is characterized by high MgO (10.02 - 12.67 %), relatively low alumina (Al2O3= 10.98 - 11.70 %), SiO2= 46.43 - 47.8 %, TiO2 (0.84 - 1.00 %), FeOt (7.75 - 7.88 %), and relatively high content of alkaline (Na2O: 2.20 - 2.59 %; K2O: 1.58 - 2.45 %; Total alkali: 4.00 - 4.89 %, and CaO (9.29 - 10.71 %). The geochemical trace element plots using various diagrams suggests the geotectonic setting of the lamprophyric rock was formed in suprasubduction alkaline continental-arc, and the proposed source of magmatism comes from the suprasubduction activities from the east. The protolith of magma was originated from partial melting of depleted MORB mantle (DMM), composed of pyroxene-peridotite (garnet-lherzolite). The partial melting conditions are suggested to occur at high pressure (3.5 - 3.8 GPa) and the depth of ~120 km with melting temperature of >1350°C, and the magma is dominantly controlled by olivine fractional crystallization.
Geochemistry Study of Cross-castic Magma Alkalinity Evolution Shaban Godang; Bambang Priadi; Fadlin Fadlin; Theo Van Leeuwen; Arifudin Idrus
Indonesian Journal on Geoscience Vol 8, No 2 (2021)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.8.2.177-196

Abstract

DOI:10.17014/ijog.8.2.177-196The discrimination of magmatic alkalinity is a classic study that has never stopped for the past ninety years. Various methodologies have been developed since Shand’s classification using the method of alumina saturation to approach silica saturation and the methodology without involving alumina and silica such as K2O vs. Na2O and others, while the aim is to find out the evolution of alkalinity during the magmatic differentiation. The classical magmatic alkalinity evolution has been known as a castic magma alkalinity evolution, where the initial magma in the form of magma-X(a) will evolve along the stages of differentiation and remain a derivative of the initial magma {magmaX(a)}. The same philosophy is also explained in the ternary AFM diagram. Is the magmatic differentiation, followed by fractional crystallization, always an evolution of alkalinity based on caste? This question often raises current debates. This study takes the example of cogenetic volcanic and albitites. The application of the cogenetic volcanic using the selected diagram, which is ‘Three in one an overlaid diagram’. The output of the diagram presents the differentiation of magma which based on the evolution of Mg-series and Fe-series in a discontinuous branch of Bowen 1922 that can take place the castic and cross-castic, e.g. (a) from Mg-series to Mg-series {castic}, (b) from Mg-series to Feseries {cross-castic}, (c) from high-Mg tholeiitic basalt to calc-alkaline series {cross-castic}, (d) from Fe-series to Fe-series {castic}. While the evolution of magmatic alkalinity based on the continuous branch and refer to Trapezoid model generally occurring a cross-castic, e.g. (A) from sodic calc-alkaline to sodic alkaline-calcic, (B) from sodic calc-alkaline to shoshonitic alkaline-calcic, (C) from sodic calc-alkaline to potassic calc-alkaline, (D) from potassic calc-alkaline to shoshonitic alkaline-calcic, (E) sodic alkaline-calcic to sodic alkaline/peralkaline, (F) shoshonitic alkaline-calcic to potassic/ultrapotassic alkaline-calcic (cross-castic in subalkaline), (G) shoshonitic/potassic alkalinecalcic to shoshonitic/potassic alkaline/peralkaline. In this study, Fossa delle Felci volcanics (Italy) shows the evolution of magma from Mg-series to Mg-series, but the evolution of alkalinity of magma reveals the cross-caste (from sodic calc-alkaline to shoshonitic alkaline-calcic). Salak volcanics (Western Jawa) shows the evolution of magma from the Mg-series to Fe-series (cross-castic), and also the cross-castic in the evolution of alkalinity from sodic calc-alkaline to alkaline-calcic. Gothara albitites (India) clearly reveal the sodic-rich alkaline, which the magma generates from the evolution of sodic alkaline-calcic to sodic alkaline without the presence of potassic.
Tholeiitic Basalt in Banyumas Basin (Kebasen, Central Java): The Evidence of Sedimentary Recycling Input and the Contribution of Oceanic Slab on Fore-arc Active Continental Margin (ACM) Magmatism fadlin fadlin; Shaban Godang; Nita Ariyanti; Wildan Nur Hamzah; Maulana Rizki Aditama
Indonesian Journal on Geoscience Vol 8, No 2 (2021)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.8.2.233-253

Abstract

DOI:10.17014/ijog.8.2.233-253The study of tholeiitic basalt is a general-classic study from geotectonic MORB, ocean island (OIB), continental rift, volcanic-arcs {IAB or Active Continental Margin (ACM)}. However, the geotectonic study of the tholeiitic volcanic-arcs is still unclear at the moment. In general, the arc tholeiitic is directly pointed to an island-arc volcanic, and the result of google search engine defines no existence of tholeiitic geochemistry which is formed from continental-arc volcanic (ACM). The problem lies in the model of discrimination diagram which is not able to discriminate ACM from the island arc volcanic. The spider diagram shows relatively similar of patterns as well as in the use of the isotope 143Nd/144Nd versus 87Sr/86Sr. Tholeiitic Kebasen pillow lava exhibits a slightly hydrothermal alteration (propyilitic alteration) which consists of plagioclase (labradorite-bytownite), olivine, pyroxene (diopside), hornblende, volcanic glass and other secondary minerals (such as iddingsite, zeolite, carbonate, sericite and opaque minerals). The results of the interpretation using the overlay diagram of Mg# and FeO(t)/MgO, diagram Nb/La vs. La/Yb, the overlaid diagram between the diagram of Zr/Y vs. Zr, newly developed diagram for sedimentary recycling (Th/Ce vs. SiO2) reveal the Kebasen lava is a differentiated tholeiitic rock with relatively low of Mg# (Mg# < 55) which is generated from geotectonic forearc ACM (Active Continental Margin) and involves the sedimentary recycling (Th/Ce > 0.1); furthermore, the trace element constituent is interpreted based upon the melting of oceanic slab (Zr/Y ~ 3). The magmatism of Kebasen lava is potentially formed at temperature of ~ 1240 oC and a pressure of ~ 1.7 GPa at the depth of ~ 56 Km.
Eksplorasi Geokimia untuk Menentukan Daerah Prospek Mineralisasi Emas Tipe Urat Epitermal: Studi Kasus di Daerah Tompaso, Kabupaten Minahasa Selatan, Sulawesi Utara Arifudin Idrus; Fadlin Fadlin; Hill Gendoet Hartono
EKSPLORIUM Vol 42, No 1 (2021): Mei 2021
Publisher : Pusat Teknologi Bahan Galian Nuklir - BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2021.42.1.6230

Abstract

ABSTRAK Sulawesi Utara termasuk daerah Tompaso, Kabupaten Minahasa Selatan merupakan jalur magmatik yang potensial menghasilkan endapan bijih hidrotermal. Penelitian ini bertujuan menentukan daerah prospek mineralisasi emas khususnya tipe urat epitermal berdasarkan eksplorasi geokimia meliputi geokimia batuan dan sedimen sungai, khususnya metode BLEG (Bulk Leach Extractable Gold). Metode penelitian meliputi pemetaan geologi, alterasi dan jalur urat, percontoan (bijih/batuan dan sedimen sungai), dan analisis geokimia. Sampel bijih dianalisis dengan metode FA/AAS untuk emas dan metode AAS untuk unsur lain, sedangkan analisis sampel sedimen sungai dilakukan dengan metode cyanide leach dan AAS. Hasil penelitian menunjukkan batuan induk mineralisasi berupa lava andesit dan intrusi diorit. Batuan ini mengalami alterasi silica-clay, argilik, dan propilitik. Perpaduan antara pemetaan geologi, zona alterasi, dan jalur urat dengan eksplorasigeokimia batuan dapat menentukan daerah prospek mineralisasi yaitu Prospek Asam dan Polangkok. Pada Prospek Asam, sampel bijih memiliki kandungan emas sampai 0,03 ppm dengan anomali emas pada sampel BLEG menunjukkan nilai threshold 13,52 ppb Au. Pada Prospek Polangkok ditemukan 2 jalur urat (P1 dan P2) berarah baratlaut-tenggara dengan lebar sampai 5 m. Urat P1 memiliki kadar Au mencapai 0,31 ppm dan pada urat P2 mencapai 0,16 ppm Au. Mineralisasi pada Prospek Polangkok didukung oleh anomali Ag pada sampel BLEG dengan nilai threshold 67,18 ppb. Kedua daerah prospek tersebut direkomendasikan untuk eksplorasi lanjut (follow-up exploration). ABSTRACT North Sulawesi, including the Tompaso region, South Minahasa district, is a part of the magmatic belts hosting potential hydrothermal ore deposits. This study is aimed to determine the prospect area for epithermal vein-type gold mineralization, based on geochemical exploration including rock and BLEG (Bulk Leach Extractable Gold) stream sediment geochemistry. Mapping of geology, alteration and vein direction, sampling (ore/rock and stream sediment), and geochemical analysis were performed. Gold in rock samples was analyzed by FA/AAS, and other elements were detected by AAS, while BLEG samples were analyzed using the cyanide leach and AAS methods. The study area is occupied by andesitic lava and diorite, which are suffered by silica-clay, argillic and propylitic alteration. An integration of geological mapping, alteration zones and vein direction with lithogeochemical survey enables to determine the prospect areas, which consist of Asam and Polangkok prospects. At the Asam prospect, the ore sample contains gold up to 0.03 ppm, where the gold anomaly in BLEG samples show a threshold of 13.52 ppb Au. At the Polangkok prospect, two NW-SE trending veins (P1 and P2 Veins) were discovered with a width of up to 5 m. Vein P1 and P2 contains of up to 0.31 and 0.16 ppm Au, respectively. Mineralization at the Polangkok prospect coincides with Ag anomaly of BLEG samples with a threshold of 67.18 ppb. The two prospect areas are recommended for follow-up exploration.
Studi Kimia Fisika Fluida Hidrotermal Endapan Emas Organik Daerah Wumbubangka, Kabupaten Bombana, Sulawesi Tenggara Fadlin Fadlin; Arifudin Idrus; I Wayan Warmada
Dinamika Rekayasa Vol 12, No 1 (2016): Jurnal Ilmiah Dinamika Rekayasa Februari 2016
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2016.12.1.141

Abstract

Penelitian ini di latar belakangi oleh karena masih sangat minimnya studi mengenai sifat kimia-fisik fluida hidrotermal pembentuk bijih pada endapan emas yang berasosiasi dengan batuan metamorf khususnya endapan emas orogenik yang ada di indonesia. Tujuan dari penelitian ini untuk mengetahui bagaimana suhu dan tekanan pembentukan endapan, serta karakteristik fluida pembentuk endapan emas pada batuan metamorf tersebut. Penelitian ini menggunakan metoda pemetaan geologi dan dikombinasikan dengan hasil analisis kimia-fisik fluida hidrotermal (inklusi fluida). Ada 3 generasi urat yang ditemukan yaitu generasi pertama, urat yang sejajar foliasi, urat tipe ini terbentuk pada 221,9 oC, dengan nilai salinitas rata-rata 7,17 wt.% NaCl ek. Urat generasi kedua adalah urat kuarsa yang memotong foliasi, urat ini terbentuk pada temperatur 188,4 oC, salinitas rata-rata 3,87 wt.% NaCl ek. Sedangkan urat generasi ke tiga yaitu urat kalsit-kuarsa, merupakan fase akhir dari endapan emas tersebut, terbentuk pada temperatur 138,2 oC dan salinitas rata-rata 1,91 wt.% NaCl ek. Secara umum evolusi fluida hidrotermal pada endapan emas orogenik yang ada dilokasi penelitian ada 2 (dua) fase yaitu fase isothermal mixing with fluids of constracting salinity, kemudian fase kedua menunjukan evolusi fluidanya lebih kearah mixing with cooler, less saline fluids. Kata kunci-Emas orogenik, tekstur urat, inklusi fluida, Bombana, Sulawesi Tenggara.
EKSPLORASI GEOLOGI BIJIH BESI BERDASARKAN DATA GEOLISTRIK INDUKSI POLARISASI DAERAH NGOLONIO NUSA TENGGARA TIMUR Adi Candra; Fadlin Fadlin; Juan Pandu GNR
Jurnal Ilmu Kebumian Teknologi Mineral (JIK TekMin) Vol 1, No 2 (2015)
Publisher : Fakultas Teknologi Mineral

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Abstract

ABSTRACTIron oxides are widespread in nature such as hematite (Fe2O3), magnetite (Fe3O4), ilmenite (TiO2 FeO), Geothite (FeO OH), limonite (FeO OH H2O), siderite (Fe2CO3), and other types. Extraction of iron oxides are used in industrial world of steel/iron which was increased in day to day. Geoelectric survey is one of the methods for studying subsurface conditions which recoreded by electrical properties of rock beneath the earth's surface that using geoelectric method modified induced polarization configuration that was conducted at Ngolonio Area, Nagakeo Regency, East Nusa Tenggara. Magnitude of induced polarization results was formed of a cross-2D and 3D model that pointed out information of iron ore distribution in the western and eastern part. Parameter test of iron ore in research area was resulted 100 to 500 ohm m for resistivity and >10 ms for the induced polarization which used for calcution of hypothetical resources. The number of resources is 14,568,866 m3 of 1,144,275 m2 area were observed to a depth of 113 m or 86.202 million m3 volume observed in western meanwhile in eastern area of 5,040,542 m3 of 366 750 m2 area were observed to a depth of 113 or 27.6285 million m3 by using a density rock 4 g/cm3. Lithological interpretation of magnitude parameters on resistivity and induced polarization was pointed out that geological conditions made sense and it could be used for consideration of iron ore exploration in future. keyword : iron ore, geoelectricity, induced polarization, resources ABSTRAKBesi pada umumnya berbentuk oksida besi seperti hematit (Fe2O3), magnetit (Fe3O4), ilmenit (FeO TiO2), Geotit (FeOOH), Limonit (FeO OH H2O), Siderit (Fe2CO3), dan jenis batuan besi lainnya. Besi digunakan dalam dunia industri baja/besi dimana kebutuhannya semakin setiap tahun. Geolistrik merupakan salah satu metoda penyelidikan kondisi bawah permukaan dengan mempelajari sifat listrik pada batuan di bawah permukaan bumi. Penelitian ini dilakukan di Daerah Ngolonio dan Sekitarnya, Kabupaten Nagakeo, Nusa Tenggara Timur dengan menggunakan metoda geolistrik konfigurasi induksi polarisasi. Hasil pengukuran resistiviti induksi polarisasi berupa penampang 2D dan blok model 3D yang memberikan informasi mengenai sebaran bijih besi pada bagian barat dan timur. Hasil uji parameter untuk bijih besi 100 sampai 500 ohm m untuk resistivitas dan > 10 ms untuk induksi polarisasi. Besarnya sumberdaya untuk daerah bagian barat sebesar 14.568.866 m3 dari 1.144.275 m2 luas area yang diamati hingga kedalaman 113 atau 86.202.000 m3 volume area yang diamati. Sedangkan untuk bagian daerah timur sebesar 5.040.542 m3 dari 366.750 m2 luas area yang diamati hingga kedalaman 113 atau 27.628.500 m3. Interpretasi litologi hasil pengukuran parameter menunjukkan kecocokan dengan kondisi geologi secara umum daerah penelitian dan dapat digunakan untuk bahan pertimbangan tahapan eksplorasi bijih besi lebih lanjut. kata kunci : bijih besi, geolistrik, induksi polarisasi, sumberdaya 
Mineralisasi Dan Prospeksi Urat Polimetalik (Pb-Zn-Cu-Au) Daerah Bukit Pondok (Bekas Tambang Voc Tahun 1902) Tanah Tidung, Kalimantan Timur Fadlin Fadlin; Adi Candra
Jurnal Ilmu Kebumian Teknologi Mineral (JIK TekMin) Vol 2, No 1 (2016)
Publisher : Fakultas Teknologi Mineral

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Abstract

ABSTRAKDaerah penelitian merupakan jalur busur magmatik Kalimantan yang berumur paleosen-Tersier Tengah, yang secara regional merupakan jalur metalogenik (Metallogenic Province) sehingga sangat menarik utnuk dilakukan kajian keberadaan potensi logam. Tujuan penelitian yaitu untuk mempelajari karakteristik mineralisasi endapan logam serta akhirnya memberikan informasi kepada pemerintah setempat mengenai endapan logam yang ada di daerah studi, sehingga pemerintah dapat meningkatkan pendapatan daerah, diantaranya dengan mengoptimalkan sumberdaya mineral yang ada. Metode penelitian yang dilakukan yaitu pemetaan geologi permukaan yang dikonsentrasikan pada pemetaan urat untuk menentukan orientasi serta geometrik urat yang berkembang di daerah penelitian dan juga dilakukan random sampling pada urat maupun batuan samping untuk dilakukan analisis geokimia dengan metode AAS (Fire Assay) di Laboratorium Intertek. Daerah penelitian tersusun oleh satuan tuff klastika yang diterobos oleh intrusi dasit dan andesit. Mineralisasi di daerah ini cukup luas dan sangat intensif, hampir semua dapat ditemukan pada batuan samping. Alterasi hidrotermal pada daerah penelitian dibagi menjadi dua tipe utama meliputi: 1.) argilik alterasi (silika-mineral lempung ”kaolin”) dan 2.) propilitik, sedangkan mineralisasi bijih pada daerah penelitian berupa logam dasar Sfalerit (ZnS), galena (PbS) dan kalkopirit (CuFeS2) yang hadir pada urat quarsa maupun pada batuan samping yang termineralisasi. Urat kuarsa di daerah penelitian ini memiliki ciri-ciri berwarna coklat–putih susu, dengan ketebalan 5–600 cm. Tekstur urat yang berkembang yaitu banded, chalcedonic dan masive cockade breccia. Pola urat kuarsa pada daerah ini relatif berarah barat-timur dengan kedudukan strike berkisar N270°E – N300 dan dip rata-rata > 60o. Hasil analisis geokimia (AAS-Fire Assay) urat kwarsa dan batuan menunjukan kehadiran unsur logam dasar (Pb, Zn dan Cu) serta logam mulia (Au dan Ag) yang cukup menarik terutama pada daerah Bukit Pondok yang pernah dilakukan penambangan oleh Belanda tahun 1902. Kata kunci : Mineralisasi, Polymetallic vein, eksplorasi, logam dasar, Bukit Pondok. ABSTRACTThe research area is one of a trajectories Borneo magmatic arc (Paleocene-Middle tertiary) that is regionally  occupied as Metallogenic Province so that much more fascinating for study of metal occurence. The aim of this reaearch is take up characteristic of mineralization and providing insight for local goverment about the resources of metal that it can be increased a local revenue such as optimalization of existing mineral resources. The method of research based on geological surface mapping in particular vein mapping for determining orientation and geometric of veins that also conducted random sampling in both the veins and wall rock which figure out geochemical characteristics by Atomic Absorption Spectroscopy (AAS) method at Intertek Laboratory. Litology of research area composed by clastical tuff that intruded by dacite and andesite intrusion. Mineralization in this area is ample and intensely that was found on the wallrock. Hydrothermal alteration can be divided into 1) argillic (silica-clay “kaolin”) and 2) prophylitic meanwhile the ore mineralization was formed by Sphalerite (ZnS), Galena (PbS) and Chalcopyrite (CuFeS2) that have presently in both on quartz veins and wallrock mineralization. Quartz characteristics is brown and pale white, 5-600 cm in thickness. Veins texture are banded, chalcedonic and massive cockade breccia. The pattern of quartz vein is relatively directed east-west with strike N270° E - N300°E and dip >60°. The results of geochemical analysis was pointed out both quartz veins and rocks that are shown elements of basic metals (Pb, Zn and Cu) and precious metals (Au and Ag) particularly at Bukit Pondok area that was mined in 1902 by Dutch. Keywords: mineralization, polymetallic vein, exploration, base metal, Bukit Pondok.
The conceptual model of Wae Sano Geothermal field based on geology and geochemistry data Fajar Rizki Widiatmoko; Mochammad Nur Hadi; Dedi Kusnadi; Sachrul Iswahyudi; Fadlin Fadlin
Journal of Earth and Marine Technology (JEMT) Vol 1, No 1 (2020)
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.2020.v1i1.1189

Abstract

Wae Sano volcano is included in the inner Banda arc, Mount Wae Sano is a type C volcano and formed the Sano Nggoang crater lake. The magmatism activity produces geothermal manifestations such as; hot spring, rock alteration, and sulfur deposits, the hottest water temperature is 81 0C, with neutral pH, but the Sano Nggoang Lake water has acid pH. It becomes interesting to examine the characteristics of the geothermal system in that area. The research was conducted by Volcanostratigraphic studies to reconstruct the geological process and Geochemical sampling of hot springs, lake water, ground air, and the soil side to understand the subsurface characterization. The result showing some period of volcano products, with the youngest come from the product of Sano Nggoang 2 that spills its product to on the north-east side of Poco Dedeng volcano. The geochemical analysis shows all manifestations originate from one reservoir, chloride water type, NaCl type of the lake water with a few SO4 influence, presumably, the hot springs supply is influenced by seawater, the estimation of the reservoir has a temperature about ± 230 0C, with dacite and the rich organic sedimentary rock, and located at ± 1456 m from the manifestation, the isothermal section shows the rate of temperature increase at 97.07 m / 10 0C. The hypothetical resource is counted about 1,488.6 kWe.
Magmatisme Tholeitik pada Active Continental Margin (ACM) di Serayu Bagian Utara dan Selatan – Banyumas, Jawa Tengah Fadlin Fadlin; Shaban Godang; Wildan Nur Hamzah
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 1 (2018): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i1.385

Abstract

Abstract - The significant amount of basaltic lava with geological age from Eocene to Miocene is found in Serayu Physiographic, Central Java. The basaltic lava has become a very interesting to observe due to its geological phenomenon and characteristics of the basaltic lava found in various tectonic positions. The objective of this research is to obtain the geological data in the form of petrological data and geochemical data from Ponjen (northern Serayu) and Kalisoka (southern Serayu) that spreading in the physiographic. The survey aimed to deduce the petrogenesis of basalt lava in the research area. The research method is using petrographic analysis and geochemical analysis by X-Ray Fluorescence (XRF), and Inductive Couple Plasma Mass Emission Spectrometry (ICP-MS). The data processing results of basalt lava by using geochemical major oxides for both zones indicating the tholeiitic origin magma and the type of plagioclase in form of labradorite. The magmatism of Ponjen-Kalisoka was formed from the tectonic setting of Active Continental Margin (ACM) with significant anomaly characteristic of Ta (Tantalum; Ta = 0,70 - 1,98 ppm) compares with basalt Gede volcanic (West Java; Ta = 0, 26 - 0.40 ppm) which is calc-alkaline which are both formed from ACM. The tholeiitic basalt of Ponjen-Kalisoka is proposed has contaminated with mantle magma which is possibly in form of intracontinental rifting resulted in Ponjen-Kalisoka's trace element becoming more into the transitional tholeiitic/calc-alkaline. The magmatism of Ponjen-Kalisoka's volcanic is a transitional magmatism (back arc volcanism) from southern volcanism (tholeiitic series) toward a calc-alkaline at northern part volcanism, such as the potassic calc-alkaline of Ungaran volcanic.Keyword: Serayu physiographic, Active Continental Margin (ACM), tholeiitic / transitional tholeiitic / calc-alkaline, magma contamination
Co-Authors Adi Candra Adi Prasetyo, Luthfi Aditama, Maulana Rizki Arifudin Idrus Ariyanti, Nita Asmoro Widagdo, Asmoro Aulia R, Astika Baharuddin Baharuddin Bambang Priadi Candra, Adi Damanik, Ramlan Dedi Kusnadi Dedi Kusnadi Ernowo Ernowo Fajar Rizki Widiatmoko Franklin Franklin Franz Michael Meyer, Franz Michael G. Siagian, Fibri Gentur Waluyo Gibran, Akhmad Khahlil Ginting, Yoe Anto Godang Shaban Godang, Shaban Godang, Shaban Godang, Shaban Godang, Shaban Gulo, Hubari Hadi, Mochammad Nur Hajar Sulystiawan, Isnu Hamzah, Wildan Nur Hamzah, Wildan Nur Herlina Herlina Hill Gendoet Hartono I Gde Sukadana I Wayan Warmada I. Nur Indra Permana Jati Indra Sanjaya Irzal Nur, Irzal Isnu Hajar Sulystiawan Iwan Setiawan Januar Aziz Zaenurrohman Jekmen Sinulingga Juan Pandu GNR Leeuwen, Theo Van Luthfi Adi Prasetyo Manalu, Widiarso Pria Hasoloan Mochammad Nur Hadi Moetamar Moetamar Muhammad Amril Asy’ari, Muhammad Amril Nanda Ajeng Nurwantari Nur Hamzah, Wildan Pasaribu, Andika pranata Prasetya, Yogi Adi Priadi, Bambang Priadi, Bambang Purba, Asriaty R Rohaya Langkoke Rozanna Mulyani Sachrul Iswahyudi Sebayang, Vanesia Amelia Sembiring, Sugihana Shaban Godang Shaban Godang Shaban Godang Shaban Godang Shaban, Godang Shaban, Godang Sibarani, Tomson Simamora, Samaria Sinaga, Ester Sinaga, Warisman Sitopu, Sapna Sufriadin, Sufriadin Sukadana, I Gde Sukmandaru Prihatmoko Tampubolon, Flansius Theo Van Leeuwen Torang Naiborhu Widiatmoko, Fajar Rizki Wildan Nur Hamzah Wildan Nur Hamzah Yohanes Iwan