Scholarlink

<p>The Cretaceous metavolcanic rocks exposed in the Thalle area, located within the Kohistan‒Ladakh Island Arc (KLIA) near the Shyok Suture Zone or Main Karakoram Thrust (MKT), northeastern Pakistan demonstrate intense alteration and associated sulfide mineralization. This study integrates host and altered-mineralized rocks petrography along with in-situ pyrite geochemical and isotope analyses to reconstruct the source and evolution of sulfide-forming hydrothermal fluids. The alteration-mineralization developed in various phases, marked by fluid evolution from early high-temperature, largely magmatic to later lower-temperature, meteoric water-influenced fluids. Pyrite, with its core, precipitated during the early magmatic-hydrothermal phase at high temperatures, evidenced by elevated Co/Ni ratios and Co-Se contents. Subsequently, the pyrite rim formation occurred at a relatively low temperature, involving the increased meteoric influence shown by the shift in trace elements, particularly As, Se, Co and Ni. The final alteration phase is characterized by the chlorite formation at low temperatures (~ 370&#xa0;°C) relative to pyrite. Sulfur (δ<sup>34</sup>S =  − 3.19‰ to − 0.32‰) and Pb (<sup>206</sup>Pb/<sup>204</sup>Pb = 18.4790–18.9000; <sup>207</sup>Pb/<sup>204</sup>Pb = 15.7150–15.7585; <sup>208</sup>Pb/<sup>204</sup>Pb = 38.8500–39.1000) isotopic data further support a predominantly magmatic fluid source with crustal contribution, presumably via the MKT, which likely facilitated fluid migration and sulfide precipitation. These findings emphasize the evolving nature of magmatic-hydrothermal systems and have implications for alteration-mineralization processes in arc-related suture zone and provide a framework for mineral exploration in similar geological terranes elsewhere.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Mineral chemistry and alteration characteristics of sulfide-bearing metavolcanics in the Thalle area, Kohistan–Ladakh Arc: insights into magmatic-hydrothermal fluid evolution

  • 期刊论文

  • 发表日期：

    2025年12月2日

查看全文
  • Muhammad Farhan,
  • Tehseen Zafar,
  • Mohammad Arif,
  • Chun-Feng Li,
  • Zahid Hussain,
  • Zaheen Ullah,
  • Syed Wajid Hanif Bukhari,
  • Uzair Siddique,
  • Syed Ali Turab,
  • Mubasir Ali

摘要

The Cretaceous metavolcanic rocks exposed in the Thalle area, located within the Kohistan‒Ladakh Island Arc (KLIA) near the Shyok Suture Zone or Main Karakoram Thrust (MKT), northeastern Pakistan demonstrate intense alteration and associated sulfide mineralization. This study integrates host and altered-mineralized rocks petrography along with in-situ pyrite geochemical and isotope analyses to reconstruct the source and evolution of sulfide-forming hydrothermal fluids. The alteration-mineralization developed in various phases, marked by fluid evolution from early high-temperature, largely magmatic to later lower-temperature, meteoric water-influenced fluids. Pyrite, with its core, precipitated during the early magmatic-hydrothermal phase at high temperatures, evidenced by elevated Co/Ni ratios and Co-Se contents. Subsequently, the pyrite rim formation occurred at a relatively low temperature, involving the increased meteoric influence shown by the shift in trace elements, particularly As, Se, Co and Ni. The final alteration phase is characterized by the chlorite formation at low temperatures (~ 370 °C) relative to pyrite. Sulfur (δ34S =  − 3.19‰ to − 0.32‰) and Pb (206Pb/204Pb = 18.4790–18.9000; 207Pb/204Pb = 15.7150–15.7585; 208Pb/204Pb = 38.8500–39.1000) isotopic data further support a predominantly magmatic fluid source with crustal contribution, presumably via the MKT, which likely facilitated fluid migration and sulfide precipitation. These findings emphasize the evolving nature of magmatic-hydrothermal systems and have implications for alteration-mineralization processes in arc-related suture zone and provide a framework for mineral exploration in similar geological terranes elsewhere.