Characteristics of a low-sulfidation epithermal deposit in the River Reef Zone and the Watuputih Hill, the Poboya gold prospect, Central Sulawesi, Indonesia

Host rocks and hydrothermal alteration

Syafrizal, Tomy Alvin Rivai, Kotaro Yonezu, Damar Kusumanto, Koichiro Watanabe, Arie Naftali Hawu Hede

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Systematic exploration has delineated significant gold mineralization in the River Reef Zone and the presence of a siliceous body at Watuputih Hill, which is a Poboya gold prospect in Central Sulawesi, Indonesia. The mineralization is hosted within the Palu Metamorphic Complex. The host rocks consist of granite, biotite gneiss, and biotite schist, which is intercalated by feldspar porphyroblastic biotite schist and amphibolitic schist. The X-ray fluorescence (XRF) analysis of the granite and biotite gneiss suggests that the granitic rocks can be characterized as magnesian arc calcalkaline rocks, with a weakly peraluminous composition. Alteration minerals were analyzed by a combination of petrographic and X-ray diffraction (XRD). In the River Reef Zone, the hydrothermal alteration zones can be sorted by their proximity to the primary fluid conduit and divided into inner, high-T, and low-T propylitic zones. In Watuputih Hill, the hydrothermal alteration can be divided into advanced argillic and argillic zones. The hydrothermal alteration assemblages indicated that the fluid was at a near-neutral pH in the River Reef Zone, whereas the fluid was acidic within Watuputih Hill. Because the hill is relatively distant from the River Reef Zone, the presence of these zones at Watuputih Hill may be indicative of another mineralization system beneath the hill.

Original languageEnglish
Article number124
JournalMinerals
Volume7
Issue number7
DOIs
Publication statusPublished - Jul 19 2017

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epithermal deposit
Reefs
hydrothermal alteration
host rock
reef
Deposits
gold
Gold
Rivers
Rocks
Granite
river
Fluids
biotite
schist
Feldspar
mineralization
gneiss
fluid
Minerals

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Geology

Cite this

Characteristics of a low-sulfidation epithermal deposit in the River Reef Zone and the Watuputih Hill, the Poboya gold prospect, Central Sulawesi, Indonesia : Host rocks and hydrothermal alteration. / Syafrizal; Rivai, Tomy Alvin; Yonezu, Kotaro; Kusumanto, Damar; Watanabe, Koichiro; Hede, Arie Naftali Hawu.

In: Minerals, Vol. 7, No. 7, 124, 19.07.2017.

Research output: Contribution to journalArticle

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