Studi Alterasi, Mineralisasi Dan Inklusi Fluida Prospek Hidrotermal (Pb-Zn-Cu±Au-Ag) Kubah Kulonprogo Bagian Selatan, Jawa Tengah
DOI:
https://doi.org/10.33332/jgsm.geologi.v20i4.432Abstract
Ore potential especially base metals, gold and silver in the Kulonprogo Mountains have been a discussion of Indonesian geologists for a long time, until now its prospects as economic value has not been found, which made it a challenge to conduct an intensive and detailed study. This study is conducted to understand the mineralization-alteration characteristics and the deposit fluid of the study area. The method used in this study is a surface geological mapping, laboratory analysis such as mineragraphy, X-ray diffraction, ore geochemistry (Atomic Absorption Spectrometry-fire assay) and fluid inclusion. Alteration zone of the study area is divided into prophylitic, advanced argilic, argilic and silicification. Vein texture that develop in the study area is a massive quartz, stock work, and vuggy quartz which has NE-SW orientation, while the sulphide mineral abundance which found are enargite, pyrite, chalcopyrite, sphalerite, malachite, and molybdenite, occur in quartz veins or disseminated in gangue rock. Ore geochemistry AAS-fire assay of five vein samples show Au and the highest Ag content shown in sample 3 (Au:3.8. g/t, Ag:10 g/t). Fluid inclusion analysis results show homogenization temperature value (Th) which is 293,4-322,4o C, melting temperature (Tm) is -5,22o C until -6,3o C with average salinity value 10,58-12,89 wt,%NaCl equivalent. Hydrothermal fluid evolution of the study area is at the mixing with cooler phase and less saline fluids. Fluid is estimated from magmatic water that slowly mixed with meteoric water which is shown by the cooling temperature and salinity value. Based on alteration, mineralization, vein texture, ore geochemistry and fluid inclusion data results, therefore the deposit type at the study area is an intermediate epithermal sulphidation (IS).
Keyword: alteration-mineralization, intermediate epithermal sulphidation, fluid inclusion, Kulonprogo Dome.
Downloads
References
Anshori, C., Hastria, D., 2013. Studi Alterasi Mineralisasi Di Sekitar Gunung Agung, Kabupaten Kulonprogo-Purworejo. Buletin Sumberdaya Geologi 8: 75-86.
Atmadja, S., Maury, R.C., Bellon, H., Pringgoprawiro, H., Polve, M., Priadi, B., 1991. The Tertiary Magmatic Belts in Java. Proc Symp. On Dynamics of Subduction and it products. The silver Jubilee Indom. Inst. Of Sci (LIPI) 98-121
Bakker, R.J., 2003. Package FLUIDS 1. Computer programs for analysis of fluid inclusion data and for modelling bulk fluid properties. Chemical Geology 194: 3-23.
Bemmelen, R.W. van, 1949. The Geology of Indonesia. General Geology of Indonesia and Adjacent Archipelagoes, First. ed. Government Printing Office, Hague.
Corbett, G.J., Leach, T.M., 1998. SW Pasific Rim Gold and Cooper System (Structure, Alteration, and Mineralization). CMS New Zealand Ltd, Auckland.
Evans, A.M., 1993. Ore Geology and Industrial Minerals, 3rd ed. Blackwell Scientific Publications, Oxford.
Guilbert, G.M., Park, C.F., 1986. The Geology of Ore Deposits. W.H. Freeman and Company., New York.
Hamilton. W, 1979. Tectonic of the Indonesian Regions. US Geological Survey Proffesion, 18-42.
Hedenquist, J.W., Izawa, E., Arribas, A., White, N.C., 1996. Epithermal Gold Deposits: Styles, Characteristic, and Exploration. Society of Economic Geologists 1: 165-182.
Hedenquist, J.W., Arribas, A., Gonzalez, U.E., 2000. Exploration for Epithermal Gold Deposits. Rev. Economic Geology 13: 245-278.
Hepherd, T.J., Rankin, A.H., Alderton, D.H.M., 1985. A Practical Guide to Fluid Inclusion Studies. Blackie and Sons, Glasgow.
Idrus, A., Warmada, I., Putri, R.I., 2013. Mineralisasi Emas Di Gunung Gupit Jawa Tengah: Sebuah Penemuan Baru Prospek Emas Tipe Epitermal Sulfida Tinggi Pada Rangkaian Pegunungan Kulonprogo. Proceeding Annual Engineering Seminar 2013. Towards Sustainable Engineering. p. D.1-7.
Irjon, R., 2018. Komposisi Kimia Pasir Pantai di Selatan Kulon Progo dan Implikasi terhadap Provenance. Jurnal Geol. dan Sumberdaya Mineral. V 19(1), 31-45.
Katili, J.A., 1975. Volcanism and plate tectonic in Indonesian Island Arc. Tectonophysics 26: 165-188.
Reyes, A.G., 2000. Petrology and Mineral Alteration in Hydrothermal Systems: From Diagenesis to Volcanic Catastrophes. Institute of Geological and Nuclear Sciences, New Zealand.
Sillitoe, R.H., Hedenquist, J.W., 2003. Linkages between volcanotectonic settings, ore fluid composition, and epithermal precious metal deposits. Society of Economic Geologists 10: 315-343.
Sopaheluwakan, J., 1976. Critiques and a new perspective on basement tectonic studies in Indonesia : a review of current results and their significance in geological exploration. Proceedings of the 30th Anniversary Symposium, Research and Development Centre for Geotechnology. Research and development Centre for Geotechnology, pp. 163-175.
Sribudiyani, Muchsin, N., Ryacudu, R., Kunto, T., Astono, P., Prasetyo, I., Sapiie, B., Asikin, S., Harsolumaksono, A.H., Yulianto, I., 2003. The Collision of The East Java Microplate and Its Implication For Hydrocarbon Occurrences in the East Java Basin. Proceedings Indonesian Petroleum Association, pp. 1-12.
Sujanto, F.X., Roskamil, 1975. The Geology and Hydrocarbon Aspects of the South Central Jawa. 4th Annual Convention of the Indonesian Petroleum Association 1974, Bandung.
Wilkinson, J.J., 2001. Fluid Inclusions in Hydrothermal Ore Deposits. Lithos 55: 229-272
Downloads
Published
Issue
Section
License
Authors who publish articles in Jurnal Geologi dan Sumberdaya Mineral (JGSM.Geologi) agree to the following terms:
- Authors retain copyright of the article and grant the journal right of first publication with the work simultaneously licensed under a CC-BY-NC or The Creative Commons Attribution–ShareAlike License.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access)
