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<p>The Neoproterozoic (ca. 827–820 Ma) Degana Rare Metal Granite (DRMG) in Rajasthan, northwest India, is characterized as a strongly peraluminous granite hosting a vein and greisen-type hydrothermal multi-rare metal deposit. Establishing a genetic model for such deposits requires understanding the temporal and spatial linkages between granites and mineralization, as well as the characteristics of the granites and their alteration processes. Numerous NW–SE, NS trending quartz–wolframite, and quartz–mica veins intruded in DRMG contain economically significant tungsten and lithium. In addition to mineralized quartz–wolframite veins, greisenized granites are also enriched in rare metals and host anomalous W–Sn–Mo–Bi–Li–Rb–Cs–Nb–Ta multi-metal mineralization. The study of DRMG samples from recent drill holes (DH-2, 3, 5, and 28) allowed a holistic approach to understanding the DRMG system. This study provides critical insights into the formation and distribution of rare metals and their sub-surface extent beneath soil cover at the Degana tungsten deposit. Geochemical investigations of recent drill hole samples show strong hydrothermal alteration signals, such as high Rb/Sr and Hf/Zr ratios, low K/Rb, Nb/Ta, and Ba/Rb ratios, and significant depletions in Ba, Hf, Zr, and Sr. These findings highlight the importance of post-magmatic fluid–rock interactions in rare metal enrichment inside DRMGs. The study provides detailed information about the petrographic and geochemical signatures of DMRGs, which can be used in similar geological environments for future exploration and resource assessment efforts.</p>

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Characterization of Degana Rare Metal Granite (DRMG): Geochemical and petrographic perspectives for exploration

  • 期刊论文

  • 发表日期：

    2025年4月29日

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  • Suresh Kumar,
  • Shishir Bhardwaj,
  • Devender Singh,
  • Achman Sharma,
  • Rudra P Singh,
  • Vivek Sharma

摘要

The Neoproterozoic (ca. 827–820 Ma) Degana Rare Metal Granite (DRMG) in Rajasthan, northwest India, is characterized as a strongly peraluminous granite hosting a vein and greisen-type hydrothermal multi-rare metal deposit. Establishing a genetic model for such deposits requires understanding the temporal and spatial linkages between granites and mineralization, as well as the characteristics of the granites and their alteration processes. Numerous NW–SE, NS trending quartz–wolframite, and quartz–mica veins intruded in DRMG contain economically significant tungsten and lithium. In addition to mineralized quartz–wolframite veins, greisenized granites are also enriched in rare metals and host anomalous W–Sn–Mo–Bi–Li–Rb–Cs–Nb–Ta multi-metal mineralization. The study of DRMG samples from recent drill holes (DH-2, 3, 5, and 28) allowed a holistic approach to understanding the DRMG system. This study provides critical insights into the formation and distribution of rare metals and their sub-surface extent beneath soil cover at the Degana tungsten deposit. Geochemical investigations of recent drill hole samples show strong hydrothermal alteration signals, such as high Rb/Sr and Hf/Zr ratios, low K/Rb, Nb/Ta, and Ba/Rb ratios, and significant depletions in Ba, Hf, Zr, and Sr. These findings highlight the importance of post-magmatic fluid–rock interactions in rare metal enrichment inside DRMGs. The study provides detailed information about the petrographic and geochemical signatures of DMRGs, which can be used in similar geological environments for future exploration and resource assessment efforts.