摘要
探讨陕西马元地区楠木树铅锌矿床围岩及容矿岩石对成矿的贡献。通过对矿床及相关地质体的系统采样,并对所采集的矿石及未风化围岩样品进行稀土元素地球化学研究,结果显示:闪锌矿具有稀土总量低、轻重稀土分馏不明显、略富集轻稀土、具有同时存在正Ce异常和明显的正Eu异常特征,且普遍可见内反射,表明矿石是在温度较低、相对还原的条件下形成;石英与矿石稀土配分模式与围岩形似,具有稀土总量低、明显的正Eu异常特征。将矿石与围岩的稀土元素配分模式进行对比表明,矿石与沥青白云岩的稀土配分模式高度一致,且与烃源岩寒武系郭家坝组具有一定的相似性,说明郭家坝组是成矿物质的主要来源之一。
The contribution of country rocks and the ore-hosting rocks to the mineralization in the Nanmushu,northern margin of the Yangtze plate,is discussed.Systematic sampling of ore deposit as well as relevant geological body is carried out in order to study the geochemical characteristics of REE.It shows that the total amount of REE of sphalerite in Nanmushu Pb-Zn deposit is low,with unconspicuous fractionation of light and heavy rare earth elements,and with obvious positive Eu anomaly and positive Ce anomaly,as well as with widespread internal reflection,indicating that the ore was formed at low temperature and at relatively reductive condition.The REE distribution patterns of quartz and ore are similar to those of country rocks,characteristic of low REE,obvious positive Eu anomaly.Comparison of REE distribution pattern of ore with that of country rock reveals that the REE distribution pattern of the ore is consistent with that of the bituminous dolomite,and similar to the strata of the Cambrian Guojiaba Formation of the source rock.Therefore,Guojiaba Formation is likely one of the major sources of sphalerite mineralization.
作者
宋志娇
陈翠华
张燕
尹力
黄小东
黎洪秩
SONG Zhijiao;CHEN Cuihua;ZHANG Yan;YIN Li;HUANG Xiaodong;LI Hongzhi(College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China)
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第6期659-669,共11页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
国家自然科学基金项目(41372093)
关键词
稀土元素
物质来源
楠木树铅锌矿床
陕西马元
rare earth element
material source
Nanmushu Pb-Zn deposit
Mayuan area of Shaanxi
作者简介
宋志娇(1991-),女,博士研究生,研究方向:矿物学、岩石学、矿床学专业,E-mail:986701736@qq.com;[通信作者]陈翠华(1972-),女,博士,教授,研究方向:矿相学、地球化学,E-mail:chencuihua@cdut.edu.cn。
