Hydrothermal Alteration and Ore Metal Mineralisation at Temon, Pacitan, East Jawa, Indonesia.
DOI:
https://doi.org/10.25299/jgeet.2021.6.1.6368Keywords:
zonation, alteration, hydrothermal, mineralization, ore, Cu-FeAbstract
Pacitan area is known as Tertiary volcanic arc in Java, as the result of subduction zone of the Indian-Australian Plate beneath the Eurasian Plate since Oligocene. It was superimposed volcanism which formed a wide area of hydrothermal alteration zone, resulting potential ore metals mineralization, such at Temon and its vicinities, Pacitan Regency, East Java Province, Indonesia. The aim of study was to analyze hydrothermal alteration and ore metal mineralization zones. 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 sand dunes of Grindulu River, which it 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 sulfide massive, and (zone 3rd) as the chloritized zone with low grade and supergene on the edge of hydrothermal alteration. It was fluid overprinted that very acid to the core of zone 1st (pH2-4) into more netral pH 4-6 (zone 2nd) and (pH5-6) in the edge zone 3rd. The potentials ore metal mineralization are Fe and Cu by pyrite, chalcopyrite, hematite, and covellite. Other potential ore metal mineralization was also from enargite by the supergene alteration.
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Abdullah, C.I., Magetsari, N.A. and Purwanto, H.S., 2003. Analisis dinamik tegasan purba pada satuan batuan Paleogen–Neogen di daerah Pacitan dan sekitarnya, Provinsi Jawa Timur ditinjau dari studi sesar minor dan kekar tektonik. Proceeding ITB Saind & Tek, 35, pp.111-127.
Bronto, S., Mulyaningsih, S., Hartono, G. and Astuti, B., 2009. Waduk Parangjoho dan Songputri: Alternatif Sumber Erupsi Formasi Semilir di daerah Eromoko, Kabupaten Wonogiri, Jawa Tengah. Indonesian Journal on Geoscience, 4(2), pp.77-92.
Bronto, S., 2013. Geologi Gunung Api Purba, cetakan kedua. Badan Geologi, Kementerian ESDM, Bandung, 184pp.
Bronto, S., 2016. Pengembangan dan terapan geologi gunung api. Badan Geologi, Kementerian ESDM, Bandung, 370pp.
Corbett, G.J. and Leach, T.M., 1998. Southwest Pacific Rim gold-copper systems: structure, alteration, and mineralization (No. 6). Littleton, Colorado: Society of Economic Geologists.
Daliran, F., 2008. The carbonate rock-hosted epithermal gold deposit of Agdarreh, Takab geothermal field, NW Iran—hydrothermal alteration and mineralisation. Mineralium Deposita, 43(4), pp.383-404.
Hartono, G., Sudrajat, A. and Syafri, I., 2008. Gumuk gunung api purba bawah laut di Tawangsari-Jomboran, Sukoharjo-Wonogiri, Jawa Tengah. Indonesian Journal on Geoscience, 3(1), pp.37-48.
Hedenquist, J.W., Arribas, A. and Reynolds, T.J., 1998. Evolution of an intrusion-centered hydrothermal system; Far Southeast-Lepanto porphyry and epithermal Cu-Au deposits, Philippines. Economic Geology, 93(4), pp.373-404.
Idrus, A., Warmada, I.W., Setyawan, I., Raditya, B. and Kurnia, M., 2009. Endapan Urat Epitermal Logam Dasar Pb-Zn Daerah Tirtomoyo, Kabupaten Wonogiri, Provinsi Jawa Tengah: Studi Awal mengenai Alterasi Hidrotermal, Mineralisasi Bijih dan Inklusi Fluida. Majalah Geologi Indonesia, Vol. 24 No. 1 April 2009: pp. 13-20.
Ismadji, S., Soetaredjo, F.E. and Ayucitra, A., 2015. The Characterization of Clay Minerals and Adsorption Mechanism onto Clays. In Clay Materials for Environmental Remediation, Springer, Cham. pp. 93-112.
Liu, Z., Mao, X., Deng, H., Li, B., Zhang, S., Lai, J., Bayless, R.C., Pan, M., Li, L. and Shang, Q., 2018. Hydrothermal processes at the Axi epithermal Au deposit, western Tianshan: insights from geochemical effects of alteration, mineralization and trace elements in pyrite. Ore Geology Reviews, 102, pp.368-385.
Mulyaningsih, S., 2016. Volcanostratigraphic Sequences of Kebo-Butak Formation at Bayat Geological Field Complex, Central Java Province and Yogyakarta Special Province, Indonesia. Indonesian Journal on Geoscience, 3(2), pp.77-94.
Mulyaningsih, S., 2015. Vulkanologi. Yogyakarta: Penerbit Ombak, 284pp.
Mulyaningsih, S., Muchlis, M., Heriyadi, N.W. and Kiswiranti, D., 2019. Volcanism in The Pre-Semilir Formation at Giriloyo Region; Allegedly as Source of Kebo-Butak Formation in the Western Southern Mountains. Journal of Geoscience, Engineering, Environment, and Technology, 4(3), pp.217-226.
Prihatmoko, S. and Idrus, A., 2020. Low-sulfidation epithermal gold deposits in Java, Indonesia: Characteristics and linkage to the volcano-tectonic setting. Ore Geology Reviews, 121, p.103490.
Samodra, H., Gafoer, S., & Tjokrosapoetro, S., 1992. Peta geologi lembar Pacitan. Jawa. Sekala 1 : 100.000. Puslitbang Geologi. Bandung.
Soeriaatmadja, R., Sunarya, Y., Sutanto And Hendaryono, 2014. Epithermal gold-copper mineralization, late Neogene calc-alkaline to potassic calc-alkaline magmatism and crustal extension in the Sunda-Banda arc.
Soeriaatmadja, R., Maury, R., Bellon, H., Pringgoprawiro, H., Polvé, M., & Priadi, B., 1994. Tertiary magmatic belts in Java. Journal of Southeast Asian Earth Sciences, 9, 13-27.
Sribudiyani, N.M., Ryacudu, R., Kunto, T., Astono, P., Prasetya, I., Sapiie, B., Asikin, S., Harsolumakso, A.H. and Yulianto, I., 2003. The collision of the East Java Microplate and its implication for hydrocarbon occurrences in the East Java Basin. The Twenty-Ninth Annual Convention & Exhibition, October 2003, Proceedings, Indonesian Petroleum Association, IPA03-G-085.
Sukisman, Y.R.S., 2021. Geologi dan Alterasi Hidrotermal di Daerah Temon dan Sekitarnya, Kecamatan Arjosari, Kabupaten Pacitan, Jawa Timur, Laporan Skripsi S1, Institut Sains & Teknologi AKPRIND Yogyakarta, 236pp.
Suyanto, I. and Rugayya, S., 2019. Identification of hydrothermal deposit mineralized zones using the induced polarization method in Kasihan Area, Pacitan, East Java. In Journal of Physics: Conference Series (Vol. 1242, No. 1, p. 012046). IOP Publishing.
Warren, I., Simmons, S.F. and Mauk, J.L., 2007. Whole-rock geochemical techniques for evaluating hydrothermal alteration, mass changes, and compositional gradients associated with epithermal Au-Ag mineralization. Economic Geology, 102(5), pp.923-948.
White, N.C. and Hedenquist, J.W., 1990. Epithermal environments and styles of mineralization: variations and their causes, and guidelines for exploration. Journal of Geochemical Exploration, 36(1-3), pp.445-474.
Widodo, W. and Simanjuntak, S., 2002. Hasil Kegiatan Eksplorasi Mineral Logam Kerjasaman Teknik Asing Daerah Pegunungan Selatan Jawa Timur (JICA/MMAJ-Jepang) dan Cianjur (KIGAM-Korea). Kolokium Direktorat Inventarisasi Sumber Daya Mineral (DIM) TA.pp: 8.14.
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