VEINS SYSTEM AND THEIR MINERALOGICAL AND MICROTHERMOMETRIC CHARACTERISTICS WITHIN THE HUMPA LEU EAST PORPHYRY COPPER-GOLD MINERALIZATION AT HU'U DISTRICT, SUMBAWA ISLAND, INDONESIA

Authors

  • Okki Verdiansyah ᵃDepartment of Geological Engineering, Universitas Gadjah Mada, Indonesia ᵇDepartment of Geological Engineering, Institut Teknologi Nasional Yogyakarta, Indonesia
  • Arifudin Idrus Department of Geological Engineering, Universitas Gadjah Mada, Indonesia https://orcid.org/0000-0003-4083-4811
  • Lucas Donny Setijadji Department of Geological Engineering, Universitas Gadjah Mada, Indonesia
  • Bronto Sutopo Geomin and Technology Development unit, PT. ANTAM Tbk, Indonesia
  • I Gde Sukadana National Nuclear Energy Agency of Indonesia

DOI:

https://doi.org/10.11113/jurnalteknologi.v84.17906

Keywords:

Porphyry, ore fluids, mineralogy, Humpa Leu East, Indonesia

Abstract

The study area, i.e Humpa Leu East is a porphyry prospect located in Hu'u district, Sumbawa Island, Indonesia. This study is aimed to understand the characteristics of veins, the distribution of veins and mineralogy, microthermometric conditions of ore fluids, distribution of elements, and their implications for exploration and deposit model. The Hu'u district is a paleo-volcano member of the Miocene to Plio-pleistocene volcanic rocks, composed of andesite, pyroclastics, diorite, quartz diorite, and a series of tonalitic intrusion. Hydrothermal alteration evolved to get out from the tonalitic body, consists of potassic, propyllitic and overprinted by phyllic and advanced argillic. The mineralization is characterized by copper-sulfides, dominated by chalcopyrite, associated with quartz±anhydrite veins, and hydrothermal breccia. Hydrothermal fluids temperature measured at the value of 109.9 °C - 525.3 °C and  > 550 ° C with an averaging range of Th is 296.5 -329.7 °C, and salinity of 10.9 wt% NaCl eq. Quartz veins occur as a package or series of porphyry type veins designated as EDM-M1-A1, A2-A3-Apsb-anh, A3-A2, M2-Apsb-A2-A3, M1-B-C, C-D-anhydrite, and epithermal veins. Hydrothermal fluids possibly have mixed by high-temperature hyper-saline fluids to medium temperature low saline fluids, except B vein has medium – high temperature and contains more abundant bornite compared to those in A vein. The Humpa Leu East can be identified as a 'push-up porphyry system' that still remains more extensive system underneath or in the side area.     

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Published

2022-07-26

How to Cite

Verdiansyah, O. ., Idrus, A., Setijadji, L. D., Sutopo, B., & Sukadana, I. G. (2022). VEINS SYSTEM AND THEIR MINERALOGICAL AND MICROTHERMOMETRIC CHARACTERISTICS WITHIN THE HUMPA LEU EAST PORPHYRY COPPER-GOLD MINERALIZATION AT HU’U DISTRICT, SUMBAWA ISLAND, INDONESIA. Jurnal Teknologi, 84(5). https://doi.org/10.11113/jurnalteknologi.v84.17906

Issue

Section

Science and Engineering