现代地质2023，Vol.37Issue(6)：1524-1537,14.DOI:10.19657/j.geoscience.1000-8527.2023.022
豫西杨山萤石矿床成因:萤石稀土元素组成和流体包裹体热力学制约
Genesis of Yangshan Fluorite Deposit in Western Henan Province:Fluorite REE Composition and Fluid Inclusion Thermomechanical Constraints
摘要
Abstract
The Yangshan fluorite deposit is located in Luanchuan County,Western Henan Province.The ore-body is developed in the bottom of the Heyu granite,and is mainly controlled by NW-and NE-trending faults.Based on the study of rare earth elements and fluid inclusions of fluorite,the source of ore-forming materials,the ore-fluid properties and the ore genesis at Yangshan are discussed.The ∑REE content of stage Ⅱ fluorite ranges from 22.61 × 10-6 to 287.94 × 10-6,LREE/HREE is of 0.64 to 5.24,and there are negative Eu a-nomalies(δEu=0.50-0.92)and Ce anomalies(δCe=0.88-1.06).With depth increases,∑REE decrea-ses,whereas LREE/HREE and LaN/YbN increase,and δEu and δCe do not change significantly.This indi-cates that the overall metallogenic time sequence is from deep to shallow,and the vertical oxygen fugacity is rel-atively stable.From the purple fluorite to green fluorite,∑REE increases,LREE/HREE and LaN/YbN de-crease,and δEu and δCe increase,indicating that recrystallization evolves from purple fluorite to green fluo-rite.The fluid inclusions of fluorite are mainly gas-liquid two phases.The homogenization temperature and sa-linity of these inclusions are concentrated in the range of 80-155 ℃ and 0.3％-6.3％(NaCleqv).Compre-hensive analysis shows that the ore-forming fluid is mainly mixed with magmatic water and meteoric water,be-longing to a low-temperature,low-salinity and low-density NaCl-H2O system.Thus,Yangshan deposit is a low-temperature and low-salinity hydrothermal deposit.Comprehensive analysis of REEs and fluid inclusion characteristics of fluorite shows that the fluorite precipitation may have been controlled by water-rock reaction.关键词
萤石/成矿地质特征/稀土元素/流体包裹体/杨山矿床Key words
fluorite/metallogenic-geological characteristic/rare earth element/fluid inclusion/Yangshan deposit分类
天文与地球科学引用本文复制引用
王启博,张寿庭,唐利,李军军,盛渊明..豫西杨山萤石矿床成因:萤石稀土元素组成和流体包裹体热力学制约[J].现代地质,2023,37(6):1524-1537,14.基金项目
国家自然科学基金项目(41902193) （41902193）
中央高校基本科研业务费项目(2652019191和2652019047). （2652019191和2652019047）
