中国有色金属学报
中國有色金屬學報
중국유색금속학보
THE CHINESE JOURNAL OF NONFERROUS METALS
2013年
9期
2683-2692
,共10页
凡口式铅锌硫化物矿床%稀土元素%配分模式%Q型聚类分析%两期热液成矿
凡口式鉛鋅硫化物礦床%稀土元素%配分模式%Q型聚類分析%兩期熱液成礦
범구식연자류화물광상%희토원소%배분모식%Q형취류분석%량기열액성광
Fankou-type lead-zinc sulfide deposit%RE element%distribution pattern%Q-mode hierarchical cluster analysis%two hydrothermal stages
为探究曲仁盆地北缘以凡口为代表的铅锌硫化物矿床的矿床成因,对该区矿石及与矿化有关的岩体做稀土元素地球化学特征研究。结果表明:黄铁矿矿石和铅锌黄铁矿矿石稀土元素球粒陨石标准化配分曲线均为富轻稀土右倾型,但大部分铅锌黄铁矿矿石重稀土段曲线右倾程度明显较低,说明黄铁矿矿化和铅锌矿化系具有不同的成矿过程,但存在物源继承关系;Eu在铅锌矿床矿石中呈正异常,在黄铁矿矿床矿石中呈低负异常,推测有偏酸性热液参与铅锌成矿作用;∑REE在燕山期侵入岩中最高,在区域寒武系地层中次之,在铅锌黄铁矿矿石中最低,推断铅锌成矿构造热事件或岩浆热事件引发了稀土元素活化迁移;矿石稀土元素的赋矿围岩灰岩、燕山一期花岗岩和中基性脉岩标准化配分曲线均显示不同程度的平坦化,反映铅锌成矿物质有多个来源;矿石与其他地质体的REEQ型聚类结果表明赋矿碳酸盐岩层是黄铁矿矿化的主要成矿物质来源,虽燕山一期花岗质岩浆为铅锌矿化提供成矿物质,但盆地基底碎屑岩层是主要成矿物质来源,燕山中晚期中基性岩脉则参与了晚期铅锌成矿作用。
為探究麯仁盆地北緣以凡口為代錶的鉛鋅硫化物礦床的礦床成因,對該區礦石及與礦化有關的巖體做稀土元素地毬化學特徵研究。結果錶明:黃鐵礦礦石和鉛鋅黃鐵礦礦石稀土元素毬粒隕石標準化配分麯線均為富輕稀土右傾型,但大部分鉛鋅黃鐵礦礦石重稀土段麯線右傾程度明顯較低,說明黃鐵礦礦化和鉛鋅礦化繫具有不同的成礦過程,但存在物源繼承關繫;Eu在鉛鋅礦床礦石中呈正異常,在黃鐵礦礦床礦石中呈低負異常,推測有偏痠性熱液參與鉛鋅成礦作用;∑REE在燕山期侵入巖中最高,在區域寒武繫地層中次之,在鉛鋅黃鐵礦礦石中最低,推斷鉛鋅成礦構造熱事件或巖漿熱事件引髮瞭稀土元素活化遷移;礦石稀土元素的賦礦圍巖灰巖、燕山一期花崗巖和中基性脈巖標準化配分麯線均顯示不同程度的平坦化,反映鉛鋅成礦物質有多箇來源;礦石與其他地質體的REEQ型聚類結果錶明賦礦碳痠鹽巖層是黃鐵礦礦化的主要成礦物質來源,雖燕山一期花崗質巖漿為鉛鋅礦化提供成礦物質,但盆地基底碎屑巖層是主要成礦物質來源,燕山中晚期中基性巖脈則參與瞭晚期鉛鋅成礦作用。
위탐구곡인분지북연이범구위대표적연자류화물광상적광상성인,대해구광석급여광화유관적암체주희토원소지구화학특정연구。결과표명:황철광광석화연자황철광광석희토원소구립운석표준화배분곡선균위부경희토우경형,단대부분연자황철광광석중희토단곡선우경정도명현교저,설명황철광광화화연자광화계구유불동적성광과정,단존재물원계승관계;Eu재연자광상광석중정정이상,재황철광광상광석중정저부이상,추측유편산성열액삼여연자성광작용;∑REE재연산기침입암중최고,재구역한무계지층중차지,재연자황철광광석중최저,추단연자성광구조열사건혹암장열사건인발료희토원소활화천이;광석희토원소적부광위암회암、연산일기화강암화중기성맥암표준화배분곡선균현시불동정도적평탄화,반영연자성광물질유다개래원;광석여기타지질체적REEQ형취류결과표명부광탄산염암층시황철광광화적주요성광물질래원,수연산일기화강질암장위연자광화제공성광물질,단분지기저쇄설암층시주요성광물질래원,연산중만기중기성암맥칙삼여료만기연자성광작용。
Rare earth elements (REE) characteristics of ores and other geological bodies were investigated to probe the genesis of Fankou-type lead-zinc sulfide deposit in the northern margin of Quren basin. The results show that the chondrite-normalized REE patterns of pyrite ores and lead-zinc pyrite ores both are LREE-enriched right type, but HREE segment curve rightist degree of lead-zinc pyrite ores is lower, meaning that pyrite and lead-zinc mineralization belong to different ore-forming processes and exist provenance inheritance relationship. Eu is positive anomaly in lead-zinc deposit ores and low negative anomaly in pyrite deposit ores, reflecting that the acidic hydrothermal is involved in lead-zinc mineralization.∑REE of Yanshanian granitic intrusive rocks is the highest, that of regional cambrian strata is the next, that of lead-zinc pyrite ores is the lowest, indicating that the migration of REE are triggered by tectonic thermal events and magmatic events in the lead-zinc mineralization. The host strata limestone, early Yanshanian granite and intermediate-basic dike rock-nomalized REE patterns of pyrite which ores all show different degrees of planarization, implies that the multiple sources are concerned with lead-zinc mineralization. REE Q-mode hierarchical cluster analysis on ores and other related geological bodies show that the related substances from ore-bearing carbonate rocks are mainly offered to pyrite metallogenesis, and the ore-forming materials of lead-zinc metallogenesis are mostly provided by basal clastic rocks, only part by early Yanshanian granitic intrusive rocks. Late Yanshanian intermediate-basic intrusive rocks participate in the late stage of lead-zinc mineralization.