豫西破山洞矿区碱性岩地球化学及稀土元素矿化特征  

Geochemical charateristics of Longwangzhuang alkaline syenite granite from Yuxi and the rare earth element mineralization

作　　者：尤文卉 李山坡[2] 吕宪河[2] 鲁培庆[2] 胡红雷 杜保峰[2] 潘小娜 宁勇[2] 崔振 YOU Wenhui;LI Shanpo;LYU Xianhe;LU Peiqing;HU Honglei;DU Baofeng;PAN Xiaona;NING Yong;CUI Zhen(Patent Examination Cooperation(Henan)Center of the Patent Office,CNIPA,Zhengzhou 450046,Henan,China;Henan Institute of Geological Survey/Henan key Laboratory of Metallogenic Geological Processes and Resource Utilization,Zhengzhou 450001,Henan,China;Henan Provincial Institute of Natural Resource Sciences,Zhengzhou 450016,Henan,China)

机构地区：[1]国家知识产权局专利局专利审查协作河南中心,河南郑州450046 [2]河南省地质调查院/河南省金属矿产成矿地质过程与资源利用重点实验室,河南郑州450001 [3]河南省自然资源科学研究院,河南郑州450016

出　　处：《矿产勘查》2022年第8期1067-1079,共13页Mineral Exploration

基　　金：河南省自然资源科研项目(豫财招标采购2020-165-3)资助。

摘　　要：破山洞稀土矿位于龙王[石童]岩体的中部,充分认识破山洞矿区碱性岩的地球化学特征及岩浆演化过程,可为在龙王[石童]岩体内寻找稀土矿产提供一定依据。破山洞钠铁闪石正长花岗岩具有高硅、富碱、高Al,贫Ca、Mg和Ti的特征,且属于过铝质碱性岩;岩石稀土元素总量较高,强烈富集轻稀土元素且轻、重稀土元素分馏明显。岩石中Dy与Er、Cr与Ni间的正相关关系,明显的P、Ti负异常及中等δEu负异常,均表明破山洞岩体在形成过程中发生了持续的结晶分异作用,暗示岩浆演化程度较高。同时,岩体中晶洞和伟晶岩脉的出现也说明岩浆富含挥发分且已经演化到岩浆-热液过渡阶段,此时稀土元素可在岩浆中高度富集并成矿。因此,龙王[石童]岩体内高演化程度的相带可能是本区稀土元素找矿的有利靶区。Poshandong RRE mine is located in the central part of Longwangzhuang rock body.Fully understanding of geochemical characteristics and magma evolution process of alkaline rock of Poshandong mine,can provide certain basis for prospecting rare earth elements in Longwangzhuang rock body.With the characteristics of high silicon,rich alkali,high Al,poor Ca,Mg and Ti,sodium iron amphibole syenitic granite of Poshandong mine belongs to peraluminous alkaline rock.The total amount of rare earth elements in the rock is high,and the light rare earth elements are strongly enriched,and it is very obvious to fractionate the light and heavy rare earth elements.The positive correlations between Dy and Er,Cr and Ni,the obvious negative anomalies of P and Ti,and the moderate negative anomalies ofδEu indicates that continuous crystallization and differentiation occurred during the formation of the Poshandong rock body,suggesting a high degree of magma evolution.At the same time,the occurrence of geodes and pegmatite veins in the rock mass also indicates that the magma is rich in volatiles and has evolved to the magmatic-hydrothermal transition stage,it is the time that rare earth elements were highly enriched in the magma and mineralized.As a result,the facies with a high evolution degree in Longwangzhuang rock body could be the favorable target areas for prospecting rare earth elements in this area.

关 键 词：破山洞 碱性岩 岩石地球化学 稀土矿床 岩浆演化 

分 类 号：P611[天文地球—矿床学]