Sukisman, Yoyok Ragowo Siswomiharjo and Mulyaningsih, Sri and Hidayah, Radhitya Adzan (2021) Zonation Analyses of Hydrothermal Alteration and Ore Metal Mineralisation at Temon, Pacitan, East Jawa, Indonesia. Journal of Geoscience, Engineering, Environment and Technology, 6 NO.1 (10). pp. 24-33. ISSN E-ISSN: 2541-5794, P-ISSN: 2503-216X
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Abstract
Pacitan area is known as the Tertiary volcanic arc in Java, as the result of the subduction zone of the Indian-Australian Plate beneath the Eurasian Plate since Oligocene. It was superimposed volcanism that formed a wide area of hydrothermal alteration zone, resulting in potential ore metals mineralization, such at Temon and its vicinities, Pacitan Regency, East Java Province, Indonesia. The study aimed to analyze hydrothermal alteration and ore metal mineralization zones. The method was surface mapping, thin section analyses, mineragraphic analyses, and X-Ray Diffraction (XRD) analyses. Field study observed denuded and deformed volcanic crater geomorphology. There are ore placer deposits within the dunes of Grindulu River, which consists of andesitic lava and breccia of Early Oligocene Mandalika Formation; Early Miocene lithic and vitric tuffs; and dacitic intrusion. The dikes of dacite as the last of volcanism was the host rock controlling the zonation of alteration and mineralization stages. Oblique normal faults and shear faults were cross over dilating formed fractures, which were as bodies to depositing the ore metals. There are (zone 1st) the argillic clay consists of quartz+alunite+dickite+kaolinite±illite with vuggy structures, (zone 2nd) the argillic clay consists of quartz+montmorillonite±illite zone with quartz vents, brecciated and massive sulfide, and (zone 3rd) as the chloritized zone with low grade and supergene on the edge of hydrothermal alteration. It was fluidly overprinted that very acid to the core of zone 1st (pH2-4) into more neutral pH 4-6 (zone 2nd) and (pH5-6) in the edge zone 3rd. The potentials of ore metal mineralization are Fe and Cu by pyrite, chalcopyrite, hematite, and covellite, and enargite by supergene alteration.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | zonation, alteration, hydrothermal, mineralization, ore, and Cu-Fe |
| Subjects: | Q Science > QE Geology |
| Divisions: | Fakultas Teknologi Mineral > Teknik Geologi (S1) |
| Depositing User: | Novri Aditya Nugroho |
| Date Deposited: | 14 Oct 2021 04:52 |
| Last Modified: | 05 Jul 2022 03:21 |
| URI: | http://eprints.akprind.ac.id/id/eprint/326 |
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