豫西合峪矿集区萤石矿床稀土元素地球化学特征及地质意义  

Geochemical Characteristics and Geological Significance of Rare Earth Elements in Fluorite Deposits of Heyu Ore Concentrated Area, Western Henan Province

作　　者：白德胜[1] 杨东潮[1] 李俊生[1] 刘纪峰[1] 张凯涛 BAI De-sheng;YANG Dong-chao;LI Jun-sheng;LIU Ji-feng;ZHANG Kai-tao(No.2 Institute of Geological&Mineral Resources Survey of Henan,Zhengzhou 450001,China)

机构地区：[1]河南省地质矿产勘查开发局第二地质矿产调查院,河南郑州450001

出　　处：《稀土》2021年第5期75-84,共10页Chinese Rare Earths

基　　金：河南省财政地质勘查项目(豫自然资发[2020]18号);河南省“探矿权、采矿权”项目(2015-05)。

摘　　要：为了探讨合峪矿集区萤石矿床稀土元素地球化学特征及其对成矿环境、成矿物质来源、成矿流体的指示意义,对研究区具有代表性的数个萤石矿床稀土元素进行研究分析。结果表明,研究区萤石与围岩稀土元素均具有轻稀土富集、轻重稀土分馏程度高、轻稀土以及重稀土内部发生分馏作用的特点,萤石与围岩均表现出铕负异常显著、铈异常不明显的特征,说明区内成矿作用发生在还原环境。萤石和围岩稀土元素配分曲线及Y/Ho-La/Ho、La+Y-Y/La、Tb/La-Sm/Nd关系图显示,研究区萤石矿可能为同一成矿流体不同成矿期次的产物,在矿床成因上与燕山晚期花岗岩的侵入关系密切,与合峪、太山庙花岗岩成矿物质来源一致或相近,成矿热液可能有深部流体加入。In order to explore the geochemical characteristics of rare earth elements in Heyu ore concentrated area and their significance for metallogenic environment, ore-forming material source and ore-forming fluid, the rare-earth elements of several typical fluorite deposits in this area were studied and analyzed. The results show that the rare earth elements in fluorite and surrounding rock are characterized by enrichment of light rare earth elements, high fractionation degree of light and heavy rare earth elements, internal fractionations of light REEs and heavy REEs. In addition, fluorite and surrounding rock show obvious negative Eu anomaly and insignificant Ce anomaly. These indicate that the mineralization took place in the reduction environment. The REE distribution curves of fluorite and wall rocks and the Y/Ho-La/Ho, La+Y-Y/La, Tb/La-Sm/Nd diagrams show that the fluorite deposits in the study area may be the products of the same ore-forming fluid in different metallogenic stages. The genesis of the fluorite deposits is closely related to the intrusion of late Yanshanian granite and can be consistent with or similar to the ore-forming material sources of Heyu granite and Taishanmiao granite.And the deepth fluid may have been added into the ore-forming hydrothermal fluid.

关 键 词：稀土元素 地球化学特征 萤石 合峪 豫西 

分 类 号：P595[天文地球—地球化学]