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<p>The Qinggouzi stibnite deposit is hosted in Paleoproterozoic metasedimentary rocks of the Laoling Group, comprising quartzite, phyllite, and schist. Petrographic observations and scanning electron microscopy (SEM) analysis reveal a simple mineral assemblage dominated by stibnite, pyrite, and arsenopyrite, accompanied by gangue minerals such as quartz, sericite, biotite, calcite, and minor chlorite. SEM imagery further aided in constraining paragenetic relationships and stratigraphic layering of the mineralized zones. The mineral assemblages and textures indicate low-grade greenschist facies metamorphism under low-temperature and low-pressure conditions. Whole-rock geochemical data show enrichment in SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, and Fe<sub>2</sub>O<sub>3</sub> + FeO, with depletion in CaO, MgO, and MnO, consistent with derivation from a felsic to intermediate continental source. Chondrite-normalized rare earth element (REE) patterns reveal moderate to strong light REE–heavy REE (LREE–HREE) fractionation (La<sub>N</sub>/Yb<sub>N</sub> = 3.14–11.95), moderate negative europium anomalies (Eu/Eu* = 0.58–0.68), LREE enrichment, and a pronounced negative europium anomaly. Chemical index of alteration (CIA) values, ranging from 70.3 to 76.2, indicate moderate to intense chemical weathering, characteristic of deposition under warm, humid conditions. Combined petrographic, geochemical, and microtextural evidence suggests that the Qinggouzi host rocks were largely derived from a post-Archean felsic crustal source, chemically matured through prolonged weathering and sedimentary recycling, and deposited in a tectonically stable passive margin setting.</p>

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Integrated petrography and geochemistry of metasedimentary host rocks from the Qinggouzi stibnite deposit, NE China: Implications for provenance and paleoweathering

  • 期刊论文

  • 发表日期：

    2025年9月30日

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  • Shahzad Bakht,
  • Fengyue Sun,
  • Bilal Ahmed,
  • Chao Hui,
  • Chenghan Xu,
  • Xinran Zhu,
  • Xingsen Chen,
  • Chengxian Liu,
  • Xingzhu Fan

摘要

The Qinggouzi stibnite deposit is hosted in Paleoproterozoic metasedimentary rocks of the Laoling Group, comprising quartzite, phyllite, and schist. Petrographic observations and scanning electron microscopy (SEM) analysis reveal a simple mineral assemblage dominated by stibnite, pyrite, and arsenopyrite, accompanied by gangue minerals such as quartz, sericite, biotite, calcite, and minor chlorite. SEM imagery further aided in constraining paragenetic relationships and stratigraphic layering of the mineralized zones. The mineral assemblages and textures indicate low-grade greenschist facies metamorphism under low-temperature and low-pressure conditions. Whole-rock geochemical data show enrichment in SiO2, Al2O3, and Fe2O3 + FeO, with depletion in CaO, MgO, and MnO, consistent with derivation from a felsic to intermediate continental source. Chondrite-normalized rare earth element (REE) patterns reveal moderate to strong light REE–heavy REE (LREE–HREE) fractionation (LaN/YbN = 3.14–11.95), moderate negative europium anomalies (Eu/Eu* = 0.58–0.68), LREE enrichment, and a pronounced negative europium anomaly. Chemical index of alteration (CIA) values, ranging from 70.3 to 76.2, indicate moderate to intense chemical weathering, characteristic of deposition under warm, humid conditions. Combined petrographic, geochemical, and microtextural evidence suggests that the Qinggouzi host rocks were largely derived from a post-Archean felsic crustal source, chemically matured through prolonged weathering and sedimentary recycling, and deposited in a tectonically stable passive margin setting.