岩石矿物学杂志2025，Vol.44Issue(6)：1267-1284,18.DOI:10.20086/j.cnki.yskw.2025.5020
山东金岭矽卡岩型铁矿磷灰石地球化学特征及地质意义
Geochemical characteristics of apatite and their geological significance in the Jinling skarn-type iron deposit,Shandong Province
摘要
Abstract
The Jinling skarn-type iron deposit,located in the Zibo area of the northern West Shandong Block,exhibits close genetic relationships with the Jinling high-Mg diorite intrusion.Through petrographic observations of diorite intrusions and skarns in the mining area,this study identifies three distinct types of apatite:magmatic Ap1 in diorite,early hydrothermal Ap2 in skarn,and late hydrothermal Ap3.Geochemical investigations of these apatite generations provide critical constraints on the evolution of ore-forming fluids and the controlling mechanisms of iron mineralization.The diorite-hosted Ap1 shows elevated Cl content,while the development of hydrous minerals(e.g.,amphibole and biotite)indicates a water-and Cl-rich magmatic system.Such magma generated iron-enriched fluids through intense hydrothermal exsolution under decompression conditions,establishing the foundation for iron enrichment.Hydrothermal Ap2 displays higher 87Sr/86Sr ratios compared to Ap1,with values approaching those of Ordovician gypsum-bearing carbonate strata,suggesting evaporite-derived materials were incorporated into the mineralization system through fluid-wallrock interactions.From Ap1 to Ap2,the Eu anomaly transitions from negative to positive values,indicating that carbonate assimilation progressively increased oxygen fugacity in the hydrothermal system.This promoted oxidation of Fe2+to Fe3+and subsequent magnetite precipitation.The gradual depletion of Fe,Mn,and rare earth elements from Ap2 to Ap3 reflects significant consumption of these elements during late-stage fluid evolution,coinciding decrease and progressive mineralization processes.关键词
磷灰石/流体演化/成岩成矿/金岭矽卡岩型铁矿Key words
apatite/hydrothermal-fluid evolution/mineralization/Jinling skarn-type iron deposit分类
天文与地球科学引用本文复制引用
王乐,张招崇,谢秋红..山东金岭矽卡岩型铁矿磷灰石地球化学特征及地质意义[J].岩石矿物学杂志,2025,44(6):1267-1284,18.基金项目
国家重点研发计划项目(2022YFC2903700) National Key Research and Development Program of China(2022YFC2903700) （2022YFC2903700）
