Scholarlink

Abstract <p>The Baihua’ao fluorite deposit is a typical fluorite deposit in central Hunan Province and is closely associated with granite. This paper conducted whole-rock geochemical, zircon U–Pb isotope geochronology, and zircon Hf isotope geochemical tests on the Yanshanian granite in the surrounding rocks to elucidate the relationship between its mineralization process and magmatic activity. The U–Pb isotopic age of zircon is 151.7 ± 1.4 Ma, belonging to the Yanshanian period. The SiO<sub>2</sub>, K<sub>2</sub>O, A/CNK, and (Zr + Nb + Ce + Y)–FeO<sup>T</sup>/MgO, (Zr + Nb + Ce + Y)–(Na<sub>2</sub>O + K<sub>2</sub>O)/CaO–(Al<sub>2</sub>O<sub>3</sub>–(K<sub>2</sub>O + Na<sub>2</sub>O))–(FeO<sup>T</sup> + MgO), and SiO<sub>2</sub> FeO<sup>T</sup>/(FeO<sup>T</sup> + MgO) indicate that the samples are classified as a peraluminous S-type granite. The Zr, Hf, FeO, MgO, and δ Eu levels suggest that the magma has experienced a certain level of crystallization fractionation. The Th, U, CaO/Na<sub>2</sub>O, Rb/Sr, Rb/Ba, εHf(t), and Al<sub>2</sub>O<sub>3</sub> + FeO + MgO + TiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub>/(FeO + MgO + TiO<sub>2</sub>) indicate that the source rock predominantly consists of Paleoproterozoic crust, with a minor contribution of mantle material. The comprehensive analysis of Y–Nb and Y + Nb–Rb diagrams, as well as the regional geological background, indicates that the tectonic setting is characterized by the return under the low-angle subduction of the ancient Pacific Ocean and the upwelling of mantle material. Comprehensive analysis indicates that the Baihua’ao fluorite deposit is a magmatic hydrothermal deposit, in which fluorine-containing minerals in subducting plates decompose to produce fluorine-rich fluids or magmas. Fluorine-saturated fluids ascend from the Earth’s mantle to the crust, resulting in the formation of fluorite deposits.</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

Geochemistry, Zircon U–Pb Geochronology, and Hf Isotope Characteristics of Yanshanian Granite from the Baihua’ao Fluorite Deposit within the Jiangnan Orogenic Belt and Their Geological Significance

  • 期刊论文

  • 发表日期：

    2026年5月28日

查看全文
  • Lei Gao,
  • Jianjun Zhang,
  • Min Shen,
  • Kaoxian Zhou,
  • Ting Chen,
  • Di Chen,
  • Zhiqin Hou

摘要

Abstract

The Baihua’ao fluorite deposit is a typical fluorite deposit in central Hunan Province and is closely associated with granite. This paper conducted whole-rock geochemical, zircon U–Pb isotope geochronology, and zircon Hf isotope geochemical tests on the Yanshanian granite in the surrounding rocks to elucidate the relationship between its mineralization process and magmatic activity. The U–Pb isotopic age of zircon is 151.7 ± 1.4 Ma, belonging to the Yanshanian period. The SiO2, K2O, A/CNK, and (Zr + Nb + Ce + Y)–FeOT/MgO, (Zr + Nb + Ce + Y)–(Na2O + K2O)/CaO–(Al2O3–(K2O + Na2O))–(FeOT + MgO), and SiO2 FeOT/(FeOT + MgO) indicate that the samples are classified as a peraluminous S-type granite. The Zr, Hf, FeO, MgO, and δ Eu levels suggest that the magma has experienced a certain level of crystallization fractionation. The Th, U, CaO/Na2O, Rb/Sr, Rb/Ba, εHf(t), and Al2O3 + FeO + MgO + TiO2–Al2O3/(FeO + MgO + TiO2) indicate that the source rock predominantly consists of Paleoproterozoic crust, with a minor contribution of mantle material. The comprehensive analysis of Y–Nb and Y + Nb–Rb diagrams, as well as the regional geological background, indicates that the tectonic setting is characterized by the return under the low-angle subduction of the ancient Pacific Ocean and the upwelling of mantle material. Comprehensive analysis indicates that the Baihua’ao fluorite deposit is a magmatic hydrothermal deposit, in which fluorine-containing minerals in subducting plates decompose to produce fluorine-rich fluids or magmas. Fluorine-saturated fluids ascend from the Earth’s mantle to the crust, resulting in the formation of fluorite deposits.