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Petrographic Study of Granitoid Rocks of Latuppa Area, Palopo, South Sulawesi, Indonesia: Implications for Mineralization Style

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Abstract:

The research area is located in the Babak River and Siguntu River, Latuppa Area, Palopo which is part of the Palopo Granitoid Rock Formation. This study aims to analyze rock types, alteration types, and ore mineralization using petrographic and mineragraphic methods. The Babak River is composed of quartz diorite and granodiorite as granitoid rocks. The Siguntu River is composed of porphyry quartz monzonite as granitoid rock and porphyry andesite as subvolcanic rock. Alteration mineral zones show alteration overprints between potassic, inner propylitic, phyllic, and adularia. The alteration overprint zones between potassic, inner propylitic, phyllic, and adularia are characterized by secondary biotite, secondary k-feldspar, magnetite, anhydrite, actinolite, epidote, diaspore, sericite, quartz, adularia, and pyrite minerals estimated to have formed at 280- 350°C. The overprint zone of alteration between the inner propylitic, phyllic, adularia are characterized by actinolite, epidote, diaspore, sericite, quartz, chlorite, adularia, and pyrite minerals estimated to have formed at 280-300°C. Ore minerals present consist of bornite, arsenopyrite, chalcopyrite, covellite and sphalerite. The overprint of the alteration zone is due to the recurrence of hydrothermal fluid supply associated with multiphase intrusion.

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Periodical:

Engineering Headway (Volume 39)

Pages:

131-141

DOI:

https://doi.org/10.4028/p-BvHaM2

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Online since:

July 2026

Authors:

Sudirman Sudirman*, Adi Maulana, Hamid Umar

Keywords:

Alteration, Granitoid, Latuppa, Mineralization

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