| 唐婷婷,唐佐其,边申武,王安华,跃连红,曾禹人.黔北务川-沿河重晶石-萤石矿床成因:来自微量元素与稀土元素的制约[J].贵州地质,2026,43(1):10-23 |
| 黔北务川-沿河重晶石-萤石矿床成因:来自微量元素与稀土元素的制约 |
| Analysis on Genesis of the Wuchuan-Yanhe Barite-Fluorite Deposit in Northern Guizhou:Constraints from Trace and Rare Earth Elements |
| 投稿时间：2025-11-12 |
| DOI： |
| 中文关键词: 务川-沿河 重晶石-萤石矿床 成矿阶段 地球化学 流体混合 矿床成因 |
| 英文关键词:Wuchuan-Yanhe Barite-fluorite deposit Metallogenic stages Geochemistry Fluid mixing Deposit genesis |
| 基金项目:贵州1∶5万红丝幅矿产地质调查项目、贵州省地矿局科研项目(黔地矿科合〔2024〕3号、黔地矿科合〔2024〕5号) |
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| 中文摘要: |
| 黔北务川-沿河地区是我国重要的重晶石-萤石矿集区。为揭示其成矿机制，本研究开展了系统的矿物学与地球化学分析。结果表明，成矿作用具有多阶段性:主成矿期(重晶石+萤石+方解石)、过渡期(重晶石+萤石+石英)及晚期(萤石)。利用La/Ho等比值有效示踪了流体演化。成矿流体为中低温(主成矿期集中于200℃左右，整体区间为90℃250℃)、低盐度的盆地卤水体系，总体处于氧化环境。成矿物质具多源性:Ba主要源自下寒武统牛蹄塘组，F主要源自震旦系-寒武系富F页岩，Ca则主要来自下奥陶统碳酸盐岩淋滤。综合认为，矿床属燕山期构造驱动下的“盆地卤水混合”成因:深部循环的富Ba-F热卤水与浅部下渗的富Ca流体混合，导致物理化学条件剧变，进而引发成矿物质分阶段沉淀。该成因模型对认识区域上类似的低温热液矿床系统具有指示意义。 |
| 英文摘要: |
| The Wuchuan-Yanhe area in northern Guizhou is an important barite-fluorite ore concentration region in ChinaTo clarify the metallogenic mechanism，this study conducted systematic mineralogical and geochemical analysesThe results indicate that the mineralization process was multi-stage，comprising a main ore-forming stage(barite + fluorite + calcite)，a transitional stage(barite + fluorite + quartz)，and a late stage(fluorite)Ratios such as La/Ho effectively traced fluid evolutionThe ore-forming fluids belonged to a moderate to low-temperature(main stage at 200℃，ranging 90℃250℃)，low-salinity basin brine system，generally in an oxidizing environmentThe ore-forming materials were derived from multiple sources:Ba primarily originated from the Lower Cambrian Niutitang Formation，F mainly from Sinian-Cambrian F-rich shales，and Ca was chiefly leached from Lower Ordovician carbonatesComprehensively，the deposit is attributed to a “basin brine mixing” mechanism driven by Yanshanian tectonism:deep-circulating Ba-F-rich hydrothermal brines mixed with shallow infiltrating Ca-rich fluids within fracture systems，leading to abrupt changes in physicochemical conditions and triggering the staged precipitation of ore-forming materialsThis understanding provides key geochemical evidence for deepening regional metallogenic patterns and guiding exploration |
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