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ALTERASI DAN MINERALISASI PADA BATUAN PORFIRI ANDESIT DAN PORFIRI GRANODIORIT DI DAERAH CIGABER DAN SEKITARNYA, KABUPATEN LEBAK, PROVINSI BANTEN Prakoso, Jodi; Patonah, Aton; Helmi, Faisal
Bulletin of Scientific Contribution Vol 14, No 1 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Geographically, the study area is located in the Cihara Region, Lebak District, Banten Province. The purpose of this research is to determine alteration zone and mineralization of porphyry andesite and porphyry granodiorite. The research method is fieldwork and laboratory analysis (petrography and minegraphy analysis). Result of research area, there are seven alteration zone; such as chlorite-sericite-quartz zone, chlorite-sericite-carbonate zone, chlorite-sericite-carbonate-quartz zone, sericite-quartz zone, chlorite-epidote-sericite zone, chlorite-epidote-sericite-carbonate zone, and chlorite-actinolit-biotite zone. Alteration type in research area is devided into three alteration type philic zone, phropilitic zone, and potasic zone. Ore mineral assemblages of research area are dominated by pyrite and calcopyrite according to type model mineral deposite the research area included of epithermal intermediete sulfidation and porphyry type. Keyword : Alteration, Mineralization, Ephitermal Intermediete Sulfidation, porphyry typeSecara Geografis daerah penelitian termasuk dalam Kecamatan Cihara, Kabupaten Lebak, Provinsi Banten. Penelitian ini dilakukan untuk mengetahui tipe alterasi dan mineralisasi daerah penelitian serta sebarannya. Metode penelitian yang dilakukan adalah pemetaan geologi dan analisis laboratorium (analisis petrografi dan minegrafi). Hasil penelitian lapangan dan analisis laboratorium daerah penelitian terbagi menjadi tujuh zona alterasi yaitu zona klorit-serisit-kuarsa, zona klorit-serisit-karbonat, zona klorit-serisit-karbonat-kuarsa, zona serisit-kuarsa, zona klorit-epidot-serisit, zona klorit-epidot-serisit-karbonat, dan zona klorit-aktinolit-biotit. Tipe alterasi daerah penelitian terbagi menjadi tiga tipe alterasi yaitu tipe alterasi filik, propilitik, dan potasik. Mineral bijih yang berkembang pada daerah penelitian didominasi oleh mineral pirit dan kalkopirit menurut model endapan mineral termasuk kedalam tipe endapan epitermal sulfida menengah dan endapan porfiri. Kata Kunci : Alterasi, Mineralisasi, Epitermal Sulfida Menengah, endapan porfiri

KARAKTERISITIK ENDAPAN POLIMETALIK EMAS DAN LOGAM DASAR DAERAH DOLOK PANGKURUHAN, KECAMATAN PEGAGAN HILIR, KABUPATEN DAIRI, PROVINSI SUMATERA UTARA: CHARACTERISTICS OF POLYMETALLIC GOLD AND BASE METAL DEPOSITS DOLOK PANGKURUHAN AREA, PEGAGAN HILIR DISTRICT, DAIRI REGENCY, NORTH SUMATRA PROVINCE Iwan Nursahan; Juan Aprilio Rafael L P; Prima M Hilman; Aton Patonah
Buletin Sumber Daya Geologi Vol 19 No 1 (2024): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v19i1.480

Several previous investigative activities in the Dolok Pangkuruhan area, Dairi Regency, North Sumatra Province have discovered several locations of gold and base metal mineralization. This article discusses the characteristics of alteration and mineralization of gold and base metals based on the results of investigations in 2023 with the aim of determining the characteristics of alteration and mineralization as well as a deposit type model. The research methods used include semi-detailed geological mapping, alteration and mineralization, XRD analysis, spectral analysis, mineralography, and fluid inclusion analysis. The alteration that develops consists of: argillic, advanced argillic, phyllic-pyrite and phyllic-silicification. There are four types of mineralization: a. Au-galena veins (Dolok Pangkuruhan) which are characterized by the presence of native gold and crystalline and colloform vein textures; b. Galena mineralization, sphalerite (Aek Sulfi), with massive and banded texture characteristics; c. quartz-silicification-sphalerite-galena vein (Sembilin River); d. quartz-bornite-chalcopyrite vein (Sikiring- kiring River). The results of fluid inclusion analysis are interpreted as epithermal deposits with mineralization formation temperatures ranging from 240°C – 346°C. Based on paragenetic sequence analysis, the mineralization characteristics can be interpreted as a model of polymetallic deposits (Au-Pb and Zn-Pb-Cu) of medium - high sulphide epithermal vein type.

KARAKTERISTIK BATUAN SEDIMEN DI HILIR SUNGAI CI GANGSA, KECAMATAN SURADE, KABUPATEN SUKABUMI, JAWA BARAT Maulana, Muhammad Hafidz; Pratiwi, Santi Dwi; Patonah, Aton
Bulletin of Scientific Contribution Vol 23, No 1 (2025): 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.v23i1.62938

Kawasan Ciletuh memiliki keragaman geologi yang kompleks. Keragaman ini merupakan hasil dari berbagai fenomena geologi yang telah terjadi sejak zaman Kapur. Salah satu keragaman geologi yang dimiliki oleh daerah Ciletuh adalah keragaman jenis batuan penyusun Formasi Jampang. Tujuan penelitian ini adalah untuk mengidentifikasi karakteristik batuan sedimen yang terdapat pada Anggota Cikarang dari Formasi Jampang. Metode yang digunakan mencakup observasi lapangan di bagian hilir Sungai Ci Gangsa dan analisis petrografi terhadap beberapa sampel batuan. Hasil penelitian menunjukkan bahwa terdapat tiga jenis batuan, antara lain batupasir (feldspathic wacke), tuf (lithic tuff), serta batugamping (packstone dan wackestone). Komposisi dari tiap batuannya menunjukkan adanya campuran material, meliputi material silisiklastik, vulkanik, dan karbonat. Hal ini dapat mengonfirmasi kondisi ketika pengendapan berlangsung, kemungkinan berupa lingkungan laut yang dipengaruhi oleh aktivitas vulkanik.Kata Kunci : Anggota Cikarang dari Formasi Jampang, Batuan Sedimen, Petrografi, Sungai Ci Gangsa, Ciletuh, Miosen.

STUDI BATUGAMPING BERDASARKAN KANDUNGAN FORAMINIFERA BESAR DI DAERAH CIRACAP, KABUPATEN SUKABUMI, PROVINSI JAWA BARAT, INDONESIA Silalahi, Natha Nuel; Pratiwi, Santi Dwi; Patonah, Aton
Bulletin of Scientific Contribution Vol 23, No 1 (2025): 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.v23i1.62890

Daerah penelitian secara geografis terletak pada koordinat 106°28'0“ BT - 106°30′30” BT dan 7°18'30“ LS - 7°21′0” LS, Kecamatan Ciracap, Kabupaten Sukabumi, Provinsi Jawa Barat. Fokus penelitian ini adalah Batugamping Formasi Cibodas di daerah Ciracap dengan menggunakan analisis foraminifera bentonik besar dengan tujuan untuk menganalisis korelasi antara jenis batugamping dengan kelimpahan foraminifera besar. Metode penelitian yang digunakan adalah observasi lapangan, termasuk pengukuran penampang, dan analisis petrografi. Hasil dari penelitian ini menunjukkan bahwa terdapat dua litologi yang berbeda yang ditemukan pada Formasi Cibodas, yaitu Packstone dan Grainstone. Selain itu, dari hasil pengamatan petrografi, ditemukan 12 spesies foraminifera besar yang dapat diidentifikasi. Setelah dilakukan penarikan umur, didapatkan umur batugamping Formasi Cibodas berada pada kisaran Tf3-Th (Miosen Akhir-Pliosen Awal). Berdasarkan analisis data, dapat disimpulkan bahwa kelimpahan foraminifera secara signifikan lebih tinggi pada batugamping packstone dibandingkan dengan grainstone. Packstone terbentuk di lingkungan yang tenang dan berenergi rendah, dengan kandungan lumpur yang cukup banyak. Lumpur ini kaya akan nutrisi, sehingga mendukung kehidupan dan pelestarian foraminifera besar sedangkan grainstone terbentuk di lingkungan energi tinggi dengan arus dan gelombang kuat yang menghambat akumulasi lumpur serta kurang mendukung untuk pelestarian foraminifera bentonik besar. Lingkungan pengendapan berada di zona terumbu hingga dasar laut.Kata Kunci: Ciracap, Cibodas, Foraminifera Besar, Packstone, Grainstone, Terumbu

KONTROL STRUKTUR TERHADAP ALTERASI DAN MINERALISASI PADA CEBAKAN EPITERMAL PROSPEK SECANG, KECAMATAN CAMPUR DARAT, KABUPATEN TULUNG AGUNG, PROVINSI JAWA TIMUR: STRUCTURAL CONTROL ON ALTERATION AND MINERALIZATION OF EPITHERMAL DEPOSIT SECANG PROSPECT, CAMPUR DARAT SUB DISTRICT, TULUNG AGUNG DISTRICT, EAST JAVA PROVINCE Fadilah, Rizqi; Vanessa, Agata; Patonah, Aton; Haryanto, Iyan
Buletin Sumber Daya Geologi Vol 20 No 2 (2025): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v20i2.519

The study area is located within the administrative district of Campurdarat Subdistrict, Tulungagung Regency, East Java Province. This research aims to analyze the role of geological structures on alteration and mineralization processes using geological and alteration mapping method, joint measurement, petrographic and mineragraphic analysis, and spectral data interpretation. The geological mapping results indicate that the lithostratigraphy of the study area, from youngest to oldest, consists of Alluvial Unit (Sa), Limestone Unit (Sbg), Volcanic Breccia Unit (Sbv), and Andesite Lava Unit (Sla). The geological structures include faults and joints, formed through a wrench fault mechanism, indicating left-lateral movement with the formation of a transpressional pop-up structure. Alteration zones belong to the high-sulfidation epithermal deposit system, consisting of four alteration types, comprising silicifaction, advanced argillic, argillic, and propylitic. Mineralization in the study area is associated with veins and vuggy quartz. Ore minerals present include pyrite, chalcopyrite, sphalerite, marcasite, magnetite, rutile, and covellite. Alteration and mineralization in the study area are controlled by northeast-southwest and northwest-southeast strike-slip faults. Faults in the study area have caused alteration overprinting and fault zones.

KARAKTERISITIK ENDAPAN POLIMETALIK EMAS DAN LOGAM DASAR DAERAH DOLOK PANGKURUHAN, KECAMATAN PEGAGAN HILIR, KABUPATEN DAIRI, PROVINSI SUMATERA UTARA: CHARACTERISTICS OF POLYMETALLIC GOLD AND BASE METAL DEPOSITS DOLOK PANGKURUHAN AREA, PEGAGAN HILIR DISTRICT, DAIRI REGENCY, NORTH SUMATRA PROVINCE Iwan Nursahan; Juan Aprilio Rafael L P; Prima M Hilman; Aton Patonah
Buletin Sumber Daya Geologi Vol 19 No 1 (2024): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v19i1.480

Several previous investigative activities in the Dolok Pangkuruhan area, Dairi Regency, North Sumatra Province have discovered several locations of gold and base metal mineralization. This article discusses the characteristics of alteration and mineralization of gold and base metals based on the results of investigations in 2023 with the aim of determining the characteristics of alteration and mineralization as well as a deposit type model. The research methods used include semi-detailed geological mapping, alteration and mineralization, XRD analysis, spectral analysis, mineralography, and fluid inclusion analysis. The alteration that develops consists of: argillic, advanced argillic, phyllic-pyrite and phyllic-silicification. There are four types of mineralization: a. Au-galena veins (Dolok Pangkuruhan) which are characterized by the presence of native gold and crystalline and colloform vein textures; b. Galena mineralization, sphalerite (Aek Sulfi), with massive and banded texture characteristics; c. quartz-silicification-sphalerite-galena vein (Sembilin River); d. quartz-bornite-chalcopyrite vein (Sikiring- kiring River). The results of fluid inclusion analysis are interpreted as epithermal deposits with mineralization formation temperatures ranging from 240°C – 346°C. Based on paragenetic sequence analysis, the mineralization characteristics can be interpreted as a model of polymetallic deposits (Au-Pb and Zn-Pb-Cu) of medium - high sulphide epithermal vein type.

KARAKTERISTIK FISIK, GEOKIMIA DAN SEBARAN ENDAPAN NIKEL LATERIT DAERAH LOJI BEACH, PULAU OBI, KABUPATEN HALMAHERA SELATAN, PROVINSI MALUKU UTARA: PHYSICAL, GEOCHEMICAL CHARACTERISTICS AND DISTRIBUTION OF NICKEL LATERITE DEPOSITS IN THE LOJI BEACH AREA, OBI ISLAND, SOUTH HALMAHERA DISTRICT, NORTH MALUKU PROVINCE Trisusanti, Eliana; Patonah, Aton; Hardiyono, Adi; Matano, Alan
Buletin Sumber Daya Geologi Vol 20 No 1 (2025): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v20i1.523

Indonesia is one of the largest nickel producing countries in the world. One of the nickel producing areas in Indonesia is in the Loji Beach area. This research area is located on Obi Island, South Halmahera Regency, North Maluku Province. Geologically, the research area is composed of ultramafic rocks. This research aims to determine the characteristics of nickel laterite and its relationship with geological conditions in the research area using petrographic methods of rock samples and XRF (X-Ray Fluorescence) geochemistry of drilling samples. Geochemical data in the form of Ni content from drill data was interpolated using the IDW method using ArcGIS software. Based on research results, Ni-laterite is abundant in the morphology of gentle hills with a slope of 0-7%. The base rock bearing Ni-laterite is thought to be serpentinite from the serpentinization of harzburgite and dunite. Based on petrographic analysis, the bedrock is composed of >85% serpentine, the rest is relict minerals olivine and orthopyroxene, as well as other minerals such as talc, oxide minerals and opaque. The results of geochemical analysis show that in the limonite zone there is an abundance of Fe elements, while in the saprolite zone the Ni element is enriched with levels of 1.5% -2.8%.

Characteristic of Mineral Alteration of Geothermal in Endut Mount Based on Petrography, Spectra, XRD, and MeB methods Patonah, Aton; Ramadhani, Rifqi Fadhil; Nurdin, Nizar M
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 1 (2026): JGEET Vol 11 No 01 : March (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.1.21933

Endut Mount is one of the geothermal prospect locations in Indonesia. In order to optimize the geothermal potential of the research area, it is necessary to conduct research on geothermal characteristics. One such study is the examination of altered minerals in geothermal manifestations. The primary objective of this research is to conduct alteration investigations utilizing coring data obtained from the drilling of Well 1 by petrography, MeB, Spectra, and XRD method approaches. The result of the research shows that the lithology of this Well is a product of Endut Mount activity, with an intensity ranging from medium to strong. The lithology is composed of altered tuff and altered andesite breccia, which are a product of the Pleistocene period, and altered volcanic breccia and altered tuff breccia, which are a product of the Miocene period. This lithology is based on the oldest to the youngest succession. The alteration assemblages in Well 1 are classified into two zones based on the assemblage of alteration minerals: the illite-chlorite±epidote zone, which is located at a depth of 9.7– 40.9 MD, and the smectite-sericite-chlorite-epidote zone, which is located at a depth of 40.9 – 111.15 MD. The type of alteration in Well 1 is propylitic, with a neutral pH and a temperature range of 200oC to 300oC, as indicated by the mineral composition and alteration zone. This alteration zone has the potential to function as a reservoir zone.

KARAKTERISTIK ALTERASI DAN MINERALISASI ENDAPAN EPITERMAL SULFIDASI TINGGI DI DAERAH BAKAN, KABUPATEN BOLAANG MONGONDOW, PROVINSI SULAWESI UTARA: CHARACTERISTICS ALTERATION AND MINERALIZATION OF HIGH SULPHIDATION EPITHERMAL DEPOSITS IN BAKAN AREA, BOLAANG MONGONDOW REGENCY, NORTH SULAWESI PROVINCE Farrel Gibran Hafizha Khansa; Aton Patonah; Cecep Yandri Sunarie; Devito Pradipta
Buletin Sumber Daya Geologi Vol 21 No 2 (2026): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v21i2.520

The Bakan area, Bolaang Mongondow Regency, North Sulawesi Province is one of the regions with gold deposit potential in Indonesia. This study aims to identify the characteristics, alteration, and mineralization in the research area through field observations, petrography, mineralography, analytical spectral devices, fire assay (FA), and Atomic Absorption Spectrophotometry (AAS). Based on the alteration mineral assemblage, the research area is divided into five alteration zones: quartz (vuggy) + alunite, quartz (massive) + alunite, alunite + dickite + kaolinite + quartz, illite + montmorillonite, and chlorite + epidote. The mineralization in the research area consists of oxide and sulfide minerals. Oxide minerals include goethite hematite and jarosite. Sulfide minerals include pyrite, sphalerite, galena, chalcopyrite, and covellite. Integrating all data, the type of hydrothermal deposit in the research area is an epithermal high-sulfide deposit with the precious metal mineralization potential zone located in the central area of the research region. The mineralization zone is associated with the massive silica and vuggy silica alteration zones, which are dominantly controlled by structures oriented Northeast - Southwest.

KARAKTERISTIK PETROGRAFI dan HUBUNGAN GENETIK ANDESIT dan BREKSI VOLKANIK KOMPLEKS KROMONG, DUKUPUNTANG, JAWA BARAT Patonah, Aton
Bulletin of Scientific Contribution Vol 24, No 2 (2026): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v24i2.72053

Penelitian ini mengevaluasi hubungan karakteristik dan hubungan genetik batuan andesit yang merupakan bagian dari Formasi Breksi Kompleks Kromong di Dukupuntang, Jawa Barat. Kajian ini dilakukan melalui metode pemetaan geologi dan analisis petrografi. Hasil penelitian menunjukkan bahwa Andesit memiliki tekstur porfiritik–afanitik, subhedral – anhedral, hipidiomorf, hipokristalin, struktur vesikuler dan struktur sheeting joint. Komposisi mineralnya terdiri atas dominansi mineral plagioklas dengan sebagian kecil hadir mineral Piroksen, gelas vulkanik, dan mineral opak. Mineral sekunder yang hadir adalah klorit dan mineral lempung. Breksi vulkanik bersifat monomiktik, terpilah buruk, berkemas terbuka, dan tersusun atas fragmen andesit menyudut tanggung berukuran kerikil hingga bongkah dalam matriks tuf litik. Kesamaan tekstur, komposisi mineral, serta tipe ubahan antara andesit dan fragmen breksi menunjukkan bahwa fragmen tersebut kemungkinan besar berasal dari tubuh andesit yang sama atau dari produk magmatik yang sangat berkerabat. Tekstur sieve pada plagioklas mencerminkan ketidakseimbangan selama evolusi magma, tetapi penyebab spesifiknya belum dapat ditentukan tanpa kimia mineral dan geokimia batuan utuh. Pseudomorf, klorit, mineral lempung, veinlet lempung, dan rekahan menunjukkan ubahan pasca-emplacement yang dipengaruhi sirkulasi fluida meteorik. Data yang tersedia mendukung model sumber-proksimal bagi breksi vulkanik, tetapi belum cukup untuk membedakan secara tegas fragmentasi eksplosif, runtuhan kubah atau aliran lava, dan proses rombakan ulang. Hasil penelitian memperjelas hubungan litologis andesit–breksi vulkanik serta menetapkan kebutuhan analisis geokimia dan geokronologi untuk menguji petrogenesis.

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