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<p>This study presents the first comprehensive geochemical and mineralogical investigation of Cretaceous-age S- and I-type granitoids from the Meratus Mountains, South Kalimantan, Indonesia, aimed at evaluating their potential for hard-rock lithium mineralization. Whole-rock geochemical analysis of 17 samples using ICP-MS revealed low bulk lithium concentrations (0.05–3.00 ppm). Despite these low concentrations, X-ray diffraction (XRD) analyses identified discrete lithium-bearing minerals. The granites predominantly host α-spodumene, whereas the associated granodiorites contain a more diverse assemblage comprising γ-eucryptite, α-spodumene, and petalite. Harker diagrams delineate a clear magmatic differentiation trend governed by fractional crystallization, while Principal Component Analysis (PCA) distinguishes between magmatic evolution processes and identifies a distinct elemental association for lithium, indicative of late-stage magmatic-hydrothermal enrichment. The presence of lithium minerals within rocks of low bulk lithium content highlights a critical exploration insight: significant localized mineralization may occur within parental granites and remain undetected by regional geochemical surveys alone. These findings provide the initial mineralogical evidence of lithium prospectivity in the Meratus Mountains and establish a foundation for future exploration targeting discrete, high-grade pegmatitic bodies in Indonesia.</p>

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Geochemistry and mineralogy of S- and I-type granitoids from the Meratus mountains, Indonesia: a new frontier for hard-rock lithium exploration

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月27日

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  • Ariyo Suharyanto,
  • Fariza Eka Yunita,
  • Januar Irawan,
  • Lia Andriyah,
  • Tri Arini,
  • Eko Sulistiyono,
  • Iwan Setiawan,
  • Florentinus Firdiyono,
  • Albertus Deny Heri Setyawan,
  • Latifa Hanum Lalasari,
  • Mohammad Zaki Mubarok,
  • Adip Mustofa,
  • Riswan Riswan,
  • Nurhakim Nurhakim

摘要

This study presents the first comprehensive geochemical and mineralogical investigation of Cretaceous-age S- and I-type granitoids from the Meratus Mountains, South Kalimantan, Indonesia, aimed at evaluating their potential for hard-rock lithium mineralization. Whole-rock geochemical analysis of 17 samples using ICP-MS revealed low bulk lithium concentrations (0.05–3.00 ppm). Despite these low concentrations, X-ray diffraction (XRD) analyses identified discrete lithium-bearing minerals. The granites predominantly host α-spodumene, whereas the associated granodiorites contain a more diverse assemblage comprising γ-eucryptite, α-spodumene, and petalite. Harker diagrams delineate a clear magmatic differentiation trend governed by fractional crystallization, while Principal Component Analysis (PCA) distinguishes between magmatic evolution processes and identifies a distinct elemental association for lithium, indicative of late-stage magmatic-hydrothermal enrichment. The presence of lithium minerals within rocks of low bulk lithium content highlights a critical exploration insight: significant localized mineralization may occur within parental granites and remain undetected by regional geochemical surveys alone. These findings provide the initial mineralogical evidence of lithium prospectivity in the Meratus Mountains and establish a foundation for future exploration targeting discrete, high-grade pegmatitic bodies in Indonesia.