Tekstur Dan Zonasi Endapan Urat Epitermal Daerah Cihonje, Kecamatan Gumelar, Kabupaten Banyumas, Jawa Tengah

Isyqi, Isyqi; Aziz, Mochammad; Idrus, Arifudin

doi:10.14203/risetgeotam2016.v26.258

Cited by 3 publications

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“…Masing-masing tekstur tersebut secara megaskopis dapat dikenali baik sebab memiliki karakteristik tersendiri. Tekstur yang teramati antara lain: Tekstur Saccharoidal Menurut (Morrison, Guoyi and Jaireth, 1990;Isyqi, Aziz and Idrus, 2016) tekstur saccharoidal merupakan salah satu tekstur primer yang dicirikan adanya kristal mineral yang menyerupai gula dan berbentuk kotak (Gambar 1a). Tekstur saccharoidal yang teramati pada sampel urat memiliki dua komposisi berbeda yaitu berkomposisi kalsit dan kuarsa.…”

Section: Hasil Penelitian Tekstur Urat Yang Teramati Pada Pengamatan Megaskopisunclassified

Karakteristik Mineralisasi Endapan Epitermal Pada Prospek Arinem Di Kabupaten Garut, Jawa Barat

Arif¹,

Syafrizal

Indriati

2021

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Prospek Arinem yang merupakan dari busur magmatic Sunda (Sunda Arc) yang terletak di wilayah kepulauan Indonesia di sisi selatan dari Sundaland dan lempeng Eurasia Dalam kegiatan eksplorasi endapan mineral bijih, penting adanya pemahaman tentang mineral. Penelitian ini bertujuan untuk mengidentifikasi karakteristik mineralisasi endapan epitermal prospek Arinem berupa tekstur, morfologi, ukuran dan kehadiran mineral bijih yang nantinya dapat membantu untuk interpretasi paragenesanya. Studi dilakukan dengan mengamati sampel singkapan permukaan serta dari lubang bor DH-0055 level 170-210 meter. Sebanyak 16 sampel singkapan permukaan dan 12 sampel pemboran inti dianalisis secara megaskopis dan mikroskopis polarisasi refraksi-refleksi serta 4 dari 12 sampel pemboran inti yang terpilih, digerus menjadi fraksi berukuran lempung dan dianalisis dengan menggunakan metode difraksi sinar-x untuk mendeteksi mineral-mineral lempung dan asosiasi mineral ubahan lainnya. Tekstur kuarsa yang hadir pada lokasi penelitian berdasarkan pengamatan megaskopis, umumnya didominasi oleh tekstur saccharoidal, colloform, comb, lattice bladed, dan banded. Mineral bijih yang teridentifikasi umumnya didominasi oleh mineral base metal dengan paragenesa secara berurutan adalah pirit, kalkopirit, galena, sfalerit, limonit, jarosit dan malasit. Alterasi pada pada lokasi penelitian dicirikan oleh keberadaan kuarsa-kloritepidot-kalsit sebagai ciri zona propilitik, serta kuarsa-kaolinit-illit yang mencirikan zona argilik. Hasil penelitian disimpulkan bahwa tipe mineralisasi pada prospek Arinem merupakan tipe epitermal sulfidasi rendah.

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Section: Hasil Penelitian Tekstur Urat Yang Teramati Pada Pengamatan Megaskopisunclassified

Karakteristik Mineralisasi Endapan Epitermal Pada Prospek Arinem Di Kabupaten Garut, Jawa Barat

Arif¹,

Syafrizal

Indriati

2021

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“…These zones are directly compared with lowsulfidation epithermal system model of Buchanan (1981) to define the position within the system of the vein in the study area. For instance, two vein texture zones occurred in Cihonje Banyumas epithermal veins are identified namely CC zone, associated with the precious metal horizon (Au-Ag) and X-zone, associated with base metal horizon (Cu-Pb-Zn) (Isyqi, Aziz and Idrus, 2016). In Soripesa Prospect, Sumbawa, quartz vein is found with various vein textures such as comb, crustiform, colloform, cockade and crystalline which are the key textures of low sulfidation epithermal deposit (Khant et al, 2012).…”

Section: Daerah Senepo Merupakan Salah Satu Daerah Prospek DI Pegununmentioning

confidence: 99%

Geology and characteristics of low sulphidation epithermal vein in Senepo area, East Java

Idrus

Handayani²

2017

IMJ

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Senepo area is one of several epithermal mineralization prospects in Southern Mountains of Java Island. This study is aimed to investigate the geological framework and hydrothermal alteration of the prospect as well as to characterize the low sulphidation (LS) epithermal vein including vein textures, ore mineral, ore chemistry and hydrothermal fluid that are responsible for the formation of the quartz vein. Detailed field mapping was completed to understand the geological framework and hydrothermal alteration zones. Petrographic, ore microscopic, XRD and AAS analyses were applied to characterize the quartz vein. The study area is occupied by pebbly sandstone, andesite breccia, andesite units and alluvial deposit. Ore mineralization is mainly hosted by andesite of Oligo-Miocene of Watupatok Formation. The host-rock has been suffered by overprinted hydrothermal alteration and weathering. The epithermal veins are found as N-S-trending quartz veins with a thickness of 1-2 meters. These veins show massive texture, crustiform, cockade, druzy, comb, and disseminated sulphides, which is included in Crystalline Quartz Zonation (X). Optical microscopy and XRD analysis indicate that these veins contain several ore minerals such as chalcopyrite, sphalerite, galena, pyrite, hematite, covellite and malachite, associated with gangue mineral including quartz, felspar, chlorite and clay minerals. AAS analysis displays variable chemical composition of precious and base metals such as Au (17-37 ppb), Ag (8.1-32.6 ppm), Cu (122.1-81,450 ppm), Pb (35.4-883.6 ppm) and Zn (18.3-2,628 ppm). Gold and silver are relatively low compared to the base metals. Fluid inclusion micro thermometric analysis indicates that ore mineralization originated at temperatures of 187-263 o C and salinity of 0.18-0.53 % wt. NaCl eq. This salinity corresponds with a minimum hydrostatic pressure of about 10-55.1 bars. Based on those characteristic data, mineralized quartz veins in the study area are classified into a base metal horizon of LS epithermal system. , Ag (8,6 ppm), Cu (122, Pb (35,6 ppm)

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Indication of ore mineralization in Bora Area, Sigi Regency, Central Sulawesi

Marliani

Asrafil

2021

J. Phys.: Conf. Ser.

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Bora area have a mineralization system associated with geothermal activity, characterized by the presence of veins in the rock. This study aims to determine the indication of ore mineral. The method that used in this research is geological field survey and mineragraphic analysis. The results showed that the vein texture in the study area was in the form of crustiform-colloform, moss, and zoned crystal textures. Mineragraphic analysis results show the mineral content of ore associated with veins in the rock including pyrite, chalcopyrite and covelite. This proves that indication ore mineral in bora area is associated with the veins formed in the rock.

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Tekstur Dan Zonasi Endapan Urat Epitermal Daerah Cihonje, Kecamatan Gumelar, Kabupaten Banyumas, Jawa Tengah

Cited by 3 publications

References 0 publications

Karakteristik Mineralisasi Endapan Epitermal Pada Prospek Arinem Di Kabupaten Garut, Jawa Barat

Karakteristik Mineralisasi Endapan Epitermal Pada Prospek Arinem Di Kabupaten Garut, Jawa Barat

Geology and characteristics of low sulphidation epithermal vein in Senepo area, East Java

Indication of ore mineralization in Bora Area, Sigi Regency, Central Sulawesi

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