A MINERALOGY AND CHLORITE CHEMISTRY CONSTRAINTS ON THE FORMATION CONDITION OF PROPYLITIC ALTERATION IN THE TUJUH BUKIT PORPHYRY DEPOSIT, EAST JAVA, INDONESIA

https://doi.org/10.56139/intan.v8i2.314

Authors

  • Vannak Por Dr.rer nat. Ir. Arifudin Idrus, ST., MT., IPU.
  • Arifudin Idrus Department of Geological Engineering, Faculty of Engineering, Universitas Gadjah Mada, Indonesia
  • Nugroho Imam Setiawan Department of Geological Engineering, Faculty of Engineering, Universitas Gadjah Mada, Indonesia
  • Ryohei Takahashi Department of Earth Resource Science, Faculty of International Resource Sciences, Akita University, Japan
  • Ran Takahashi Department of Earth Resource Science, Faculty of International Resource Sciences, Akita University, Japan
  • Miftahul Abrar Department of Earth Resource Science, Faculty of International Resource Sciences, Akita University, Japan

Keywords:

Chlorite Geothermometer; Oxygen Fugacity; Propylitic Alteration; Sulfur Fugacity

Abstract

Propylitic alteration develops chlorite, epidote, and calcite assemblages commonly found in porphyry copper–gold deposits. This study aims to understand the formation temperature, oxygen, and sulfur fugacity of chlorite, a characteristic central element of propylitic-related minerals such as epidote and calcite, using a combination of qualitative and quantitative experimental methods. The propylitic alteration forming condition was analyzed in detail using a superprobe (JXA-iSP100) and Electron Probe Micro Analysis (EPMA) at a voltage of 15.0 kV. The chlorite composition is relatively homogeneous, and displayed as Mg-rich chlorite (Type-I) within AlIV-Mg-Fe, ripidolite with respect to Si vs Fe/(Fe+Mg). The chlorite geothermometer indicates that the crystallizing temperature ranges from 288.30 to 332.82°C. The oxygen and sulfur fugacity log fO2 and log fS2 of chlorite are low ranges (– 70.4 to – 51.85) and (– 32.55 to – 20.65), respectively. The analyses identify the mineral as true epidote, with spatial variations indicating Fe occurs as Fe³⁺ and Mn as Mn²⁺. However, the examined proportion of moles of the significant elements (Mg, Ca, Fe, Mn) indicates that calcite is present in hydrothermal systems.

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Published

2025-10-31

How to Cite

Por, V., Idrus, A., Setiawan, N. I. ., Takahashi, R. ., Takahashi, R., & Abrar, M. (2025). A MINERALOGY AND CHLORITE CHEMISTRY CONSTRAINTS ON THE FORMATION CONDITION OF PROPYLITIC ALTERATION IN THE TUJUH BUKIT PORPHYRY DEPOSIT, EAST JAVA, INDONESIA. INTAN Jurnal Penelitian Tambang, 8(2), 52–63. https://doi.org/10.56139/intan.v8i2.314

Issue

Vol. 8 No. 2 (2025): INTAN: Jurnal Penelitian Tambang

Section

Articles
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Copyright (c) 2025 Vannak Por, Arifudin Idrus, Nugroho Imam Setiawan, Ryohei Takahashi, Ran Takahashi, Miftahul Abrar

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