闽西南凤山-赤坂场矽卡岩型萤石矿床地球化学特征及成因

闽西南凤山-赤坂场萤石矿主要产于晚侏罗世花岗质侵入岩与中二叠世栖霞组海相碳酸盐岩接触变质带中，通过对萤石及黑云母二长花岗岩围岩开展稀土元素地球化学及包裹体氢氧同位素研究，探讨了矿床的成因及成矿物质、流体来源。萤石稀土元素配分曲线特征和La/Ho-Y/Ho关系图表明凤山-赤坂场萤石矿体的成矿流体来自同一流体体系，成矿物源稳定且单一，为同期成矿。萤石和花岗岩围岩相近的Sm/Nd比值以及均具有δEu和δCe负异常特征，表明萤石成矿和二长花岗岩体有着十分密切的联系。结合萤石包裹体氢氧同位素结果，显示研究区萤石矿床成矿流体来源于岩浆水与大气降水的混合，成矿物质F和Ca元素来源于大气降水对围岩花岗岩和碳酸盐岩的淋滤和萃取，属于构造控制的岩浆期后气化-热液的低温热液充填萤石矿床。

Geochemical characteristics and genesis of the skarn type fluorite deposit in Fengshan-Chibanchang, southwest Fujian Province

The fluorite in Fengshan-Chibanchang mining area in southwestern Fujian mainly occurs in the contact metamorphic zone between Late Jurassic intrusive rocks and Middle Permian marine carbonate rocks of Qixia Formation. It also discusses the genesis, metallogenic materials, and fluid sources of the deposit on the basis of the rare earth elements, Hydrogen and oxygen isotope in fluorite. The REE distribution patterns and La/Ho-Y/Ho relationship diagram of fluorite show that the ore-forming fluid of Fengshan-Chibanchang fluorite ore body comes from the same fluid system, with stable and single source of ore-forming material, which is contemporaneous mineralization. The similar Sm/Nd ratio and negative Eu and Ce anomalies of REE characteristics between fluorite and granitic wall rocks indicate that there is a very close relationship between fluorite mineralization and monzonitic granite body. Combined with the results of hydrogen-oxygen isotopes of fluid inclusions in fluorite, Combined with hydrogen and oxygen isotope results of fluorite inclusions, the study area is a mixture of magmatic water and meteoric precipitation, ore-forming elements F and Ca were mainly derived from Late Jurassic biotite monzonitic granite wall rock and Middle Permian marine carbonate rock of Qixia Formation. It belongs to a low-temperature hydrothermal filling type fluorite deposit controlled by structure during post-magmatic stage.