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All Journal Buletin Sumber Daya Geologi Journal of Applied Geology
Sven Sindern
RWTH Aachen University, Germany
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Environmental Science

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Hydrothermal Alteration and Mineralization of the Randu Kuning Porphyry Cu-Au and Intermediate Sulphidation Epithermal Au-Base Metals Deposits in Selogiri, Central Java, Indonesia Sutarto Sutarto; Arifudin Idrus; Agung Harijoko; Lucas Donny Setijadji; Franz Michael Meyer; Sven Sindern; Sapto Putranto
Journal of Applied Geology Vol 1, No 1 (2016)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (23220.401 KB) | DOI: 10.22146/jag.26951

Abstract

The Randu Kuning Porphyry Cu-Au prospect area is situated in the Selogiri district, Wonogiri regency, Central Java, Indonesia, about 40 km to the South-East from Solo city, or approximately 70 km east of Yogyakarta city. The Randu Kuning area and its vicinity is a part of the East Java Southern Mountain Zone, mostly occupied by both plutonic and volcanic igneous rocks, volcaniclastic, silisiclastic and carbonate rocks. Magmatism-volcanism products were indicated by the abundant of igneous and volcaniclastic rocks of Mandalika and Semilir Formation. The Alteration zones distribution are generally controlled by the NE–SW and NW–SE trending structures. At least eight types of hydrothermal alteration at the Randu Kuning area and its vicinity had been identified, i.e. magnetite + biotite ± K-feldspar ± chlorite (potassic), chlorite + sericite + magnetite ± actinolite, chlorite + magnetite ± actinolite ± carbonate (inner propylitic), chlorite + epidote ± carbonate (outer propylitic), sericite + quartz + pyrite (phyllic), illite + kaolinite ± smectite (intermediate argillic), illite + kaolinite ± pyrophyllite ± alunite (advanced argillic) and quatz + chlorite (sillisic) zones. The Randu Kuning mineralization at Selogiri is co existing with the porphyry Cu-Au and intermediate sulphidation epithermal Au-base metals. Mineralization in the porphyry environment is mostly associated with the present of quartz-sulphides veins including AB, C, carbonate-sulphides veins (D vein) as well as disseminated sulphides. While in the epithermal prospect, mineralization is particularly associated with pyrite + sphalerite + chalcopyrite + carbonate ± galena veins as well as hydrothermal breccias. The Randu Kuning porphyry prospect has copper gold grade in range at about 0.66–5.7 gr/t Au and 0.04–1.24 % Cu, whereas in the intermediate sulphidation epithermal contain around 0.1–20.8 gr/t Au, 1.2–28.1 gr/t Ag, 0.05–0.9 % Zn, 0.14–0.59 % Pb and 0.01–0.65 % Cu.
EVOLUSI FLUIDA HIDROTERMAL-MAGMATIK PADA PROSPEK PORFIRI-EPITERMAL Cu-Au RANDU KUNING, SELOGIRI, JAWA TENGAH, INDONESIA:KAJIAN BERDASARKAN STUDI INKLUSI FLUIDA: MAGMATIC-HYDROTHERMAL FLUID EVOLUTION IN THE PORPHYRY-EPITHERMAL CU-AU RANDU KUNING PROSPECT, SELOGIRI, CENTRAL JAVA, INDONESIA: INSIGHTS FROM FLUID INCLUSION STUDIES Sutarto; Arifudin Idrus; Agung Harjoko; Lucas Donny Setijadji; Sven Sindern
Buletin Sumber Daya Geologi Vol 21 No 2 (2026): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v21i2.608

Abstract

The Randu Kuning Prospect, located in the Southern Mountains Zone of East Java, Indonesia, represents a magmatic-hydrothermal mineralization system that evolved from a porphyry environment to a shallow-level epithermal system. The prospect is hosted by volcaniclastic, siliciclastic, and carbonate rocks of the Mandalika and Semilir Formations, which are intruded by numerous dioritic bodies related to Late Eocene–Early Miocene magmatism. This study aims to reconstruct the evolution of ore-forming fluids based on fluid inclusion characteristics and their relationship to hydrothermal alteration and mineralization. Fluid inclusion analyses were conducted on ten vein samples representing both porphyry and epithermal environments using a Linkam heating-freezing stage. To support the interpretation, petrographic, X-ray diffraction (XRD), QEMSCAN, X-ray fluorescence (XRF), and ICP-MS analyses were also performed. The fluid inclusion data indicate that the hydrothermal system evolved through three major stages. The early porphyry stage was characterized by high-temperature and high-salinity fluids, with homogenization temperatures of approximately 600°C and salinities ranging from 16 to 72 wt.% NaCl equivalent. These fluids were associated with A-type and M-type quartz veins and potassic alteration assemblages. During the intermediate porphyry stage, fluid temperatures decreased to approximately 300–350°C, while salinities ranged from 16 to 48 wt.% NaCl equivalent. This stage was associated with sulfide-bearing quartz veins (AB-type and C-type veins) and phyllic as well as chlorite–magnetite–sericite alteration assemblages. The late porphyry to epithermal stage was characterized by lower temperatures (200–350°C) and lower salinities (2.31–36.74 wt.% NaCl equivalent), resulting in the formation of D-type veins, carbonate–pyrite–sphalerite–chalcopyrite veins, and other epithermal-style veins accompanied by propylitic, intermediate argillic, and locally developed advanced argillic alteration. The progressive decrease in temperature and salinity indicates continuous evolution of the hydrothermal fluids from porphyry c to a shallower epithermal environment, thought to be primarily controlled by cooling and mixing processes with meteoric water.
Co-Authors Agung Harijoko Agung Harjoko Arifudin Idrus Franz Michael Meyer Lucas Donny Setijadji Sapto Putranto Sutarto Sutarto Sutarto