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Nurkhamim Nurkhamim
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Earth & Planetary Sciences Energy Engineering Environmental Science

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Journal : Jurnal Ilmiah Geologi pangea

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Hubungan Tekstur Urat Kuarsa dan Kimia Bijih Endapan Emas Epitermal di Daerah Mekarbakti, Kecamatan Bungbulang, Kabupaten Garut, Provinsi Jawa Barat Satriadi Abdullah; Arifudin Idrus; Nurkhamim Nurkhamim; Rangga Bintang Ardaraja
Jurnal Ilmiah Geologi PANGEA Vol 10, No 1 (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.v10i1.9620

Abstract

Gold deposits in the West Java area, especially South Garut, enter the hydrothermal system due to Quaternary volcanic activity (Gaffar, 2017). Quartz is the main component of hydrothermal system deposits. Quartz veins have an important role in texture formation which can be used to determine the formation process and texture correlation with ore minerals (Dong et al, 1995). Quartz texture relationship in the study area is interesting to study because it becomes a reference in determining the prospect zone for the presence of precious metals as well as a reference for further exploration. For this reason, the purpose of this study was to determine the relationship between quartz texture and the presence of precious metals and base metals in the study area. The research area is in the Mekarbakti Village area, Bungbulang District, Garut Regency, West Java Province. The study area is included in the Jampang formation which is not aligned with the younger undecomposed unit (Qtv), the lithology of the study area is andesite lava, andesite breccia, lapilli, tuff, andesite intrusion and volcanic deposits. This study uses 3 methods, namely detailed field observations, ore microscopy analysis on seven samples DER_004, DER_005, DER_031, DER_001, DER_003, DER_014, DER_030 and analysis of Fire Assay Atomic Absorption Spectrophotometry (FA-AAS) and Inductively Coupled Plasma – Optical Emission Spectrometry. (ICP-OES) on seven samples DC_000087, DC_000073, DC_000030, DC_000053, DC_000048, MC_000081, DC_000082. From the results of field activities and laboratory analysis, the texture of the research area is divided into seven textures, namely cockade, lattice bladed, saccharoidal, banded comb, brecciated, colloform. The geochemistry of the ore in the study area has a fairly high grade and is associated with quartz vein textures, including brecciated Au texture 3.21 ppm, Ag 74.7 ppm, collorform Au texture 2.605 ppm, Ag 22.9 ppm, lattice bladed Au texture 1.625 ppm, Ag 2.3 ppm, saccharoidal Au texture 1.465 ppm, Ag 1.2 ppm, banded texture Au 1.257 ppm, Ag 2.3, cockade texture Au 0.079 ppm, Ag 2.7 ppm and comb texture Au 0.021 ppm, Ag 1 ppm, on the texture the presence of precious metals was observed and abundant base metals. The texture of the quartz veins in the study area, when compared with the calcifications of Morison, et al 1990, falls into the crystalline quartz zone and the crusstiform – colloform zone.
Karakteristik Geologi, Alterasi Hidrotermal Dan Mineralisasi Daerah Penyompa, Kecamatan Rantau Pulut, Kabupaten Seruyan, Provinsi Kalimantan Tengah. Satriadi Abdullah; Arifudin Idrus; Nurkhamim Nurkhamim; Kris Ramlan; Arfan Siregar
Jurnal Ilmiah Geologi PANGEA Vol 10, No 1 (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.v10i1.9633

Abstract

The characteristics of the ore deposit will be greatly influenced by the geological conditions of the area. Surface manifestations of an ore deposit can be identified by the presence of alteration and mineralization zones. The study of alteration zones and mineralization will assist in making an exploration plan for an ore deposit. The purpose of this study is to determine the geological conditions in more detail, and the potential for ore deposits in the study area by alteration, mineralization, and rock geochemistry. Field data collection techniques include geological mapping, and laboratory analysis includes geochemical analysis using the Fire Assay Atomic Absorption Spectrophotometry (FA-AAS) method. The study shows that the lithology of the study area is volcanic rocks composed of andesitic intrusive rocks, diorite rocks, granite rocks, and pyroclastic rocks in the form of breccias. Hydrothermal alteration that develops in the study area can be divided into four zones of alteration type, namely: silicification zone (quartz ± kaolin ± pyrite), argillic zone (kaolin ± quartz), inner propylitic zone (quartz ± chlorite ± epidote ± albite ± pyrite), and outer propylitic zone (quartz ± chlorite ± epidote). Based on the lithology and type of alteration found, it is known that the type of deposit in the study area is part of Cu-Au porphyry deposits in the retrograde and post-mineral alteration stages based on the model of Corbett (1854). Mineralization potential in the study area includes pyrite-sulfide potential, hematite potential with paramagnetic properties, and hematite oxide potential. The results of the geochemical analysis showed that the research area had the highest levels of 0.02 ppm Au, 0.8 ppm Ag, 20 ppm Cu, and Fe <100 ppm.
Co-Authors Aji Mawardi Ardiawan Ardiawan Arfan Siregar Arifudin Idrus Arrina Khanifa Cahyadi, Tedy Agung Dwi Herniti Erwedi Erwedi Fadli Fadli Kadek Nando Setiawan Ketut, Gunawan Kris Ramlan Mochamad Nabil Mycelia Paradise Rangga Bintang Ardaraja Rika Ernawati Satriadi Abdullah Shahensah Anand Anggian Rambe Shenny Linggasari Waterman SB