• 首页|本刊简介|在线投稿|过刊浏览|高级检索|专家风采|学习园地|期刊论坛|联系我们
黔东北大竹园萤石矿床Sm-Nd等时线年龄及其地质意义
Sm-Nd isochron age of the Dazhuyuan fluorite deposit in northeastern Guizhou and its geological significance
投稿时间:2017-12-27  修订日期:2018-07-16
中文关键词:萤石矿  Sm-Nd同位素  大竹园  黔东北
英文关键词:fluorite deposit  Sm-Nd isotope  Dazhuyuan  northeastern Guizhou
基金项目:中国地质调查局地质矿产调查项目(DD20179232,DD20160029)
作者单位
张遵遵 中国地质调查局武汉地质调查中心, 湖北 武汉 430205 
龚银杰 中国地质调查局武汉地质调查中心, 湖北 武汉 430205 
金世超 中国地质调查局武汉地质调查中心, 湖北 武汉 430205 
漆双林 中南冶金地质研究所, 湖北 宜昌 443003 
甘金木 中国地质调查局武汉地质调查中心, 湖北 武汉 430205 
张利国 中国地质调查局武汉地质调查中心, 湖北 武汉 430205 
摘要点击次数: 35
全文下载次数: 33
中文摘要:
      黔东北(沿河)-渝东南(酉阳)一带广泛发育萤石、重晶石及铅锌(汞)矿化,关于其成矿时代,一直缺少直接的同位素年龄证据。黔东北大竹园萤石矿床位于上扬子地块东南缘,矿体赋存于下奥陶统桐梓组和红花园组碳酸盐岩内,受NW向断裂控制,是本区热液脉型萤石矿床的代表。本文以该矿床为研究对象,利用单矿物Sm-Nd等时线方法进行了成矿年龄测定,获得萤石Sm-Nd等时线年龄为436±15 Ma(MSWD=0.85),萤石与共生方解石Sm-Nd等时线年龄为430±13 Ma(MSWD=1.02),两者在误差范围内一致,表明矿床形成于加里东期,该年龄与湘西-黔东MVT铅锌矿床成矿时代(477~410 Ma)一致。本区萤石-重晶石矿床与区内产出的主要铅锌(汞)矿床关系密切,推测它们有相近的物质来源,是在同一构造运动时期形成的一个有亲缘关系的成矿系列。研究结果指示加里东期是区内重要的萤石-重晶石-铅锌(汞)中低温热液成矿期。
英文摘要:
      Fluorite, barite and lead-zinc (mercury) minerals are widely distributed in northeastern Guizhou (Yanhe)-southeastern Chongqing (Youyang) area; nevertheless, there has been no direct isotope age evidence about the mineralization age. The Dazhuyuan fluorite deposit in the northeast of Guizhou is located at the southeast edge of the upper Yangtze block, the orebodies are hosted in the Lower Ordovician carbonate of Tongzi and Honghuayuan formations, controlled by NW-trending faults,and the deposit is the representative in the hydrothermal vein type fluorite deposits of this area. Therefore, the authors selected the deposit to carry out the dating of the mineralization by using the monomineral Sm-Nd isochron method and obtained the Sm-Nd isochron age of fluorite of 436±15 Ma (MSWD=0.85), and the age of associated calcite and fluorite assemblage of 430±13 Ma (MSWD=1.02); the two ages are consistent, indicating that the Dazhuyuan fluorite deposit was formed in Caledonian, and the ages are consistent with the ages (477~410 Ma) of the MVT lead and zinc deposits in west Hunan-east Guizhou area. The fluorite-barite deposits in this area are closely related to the main lead-zinc (mercury) deposits, and therefore the authors infer that they had the similar sources, and constituted a metallogenic series which had genetic relationship and were formed during the same tectonic movement period. All this indicates that Caledonian period was an impor-tant medium-low temperature hydrothermal metallogenic period for the formation of fluorite-barite and lead-zinc (mercury) deposits.
张遵遵,龚银杰,金世超,漆双林,甘金木,张利国,2018,黔东北大竹园萤石矿床Sm-Nd等时线年龄及其地质意义[J].岩石矿物学杂志,(6):949~958.
查看全文  查看/发表评论  下载PDF阅读器
关闭
您是本站第 4993974位访问者  京ICP备05032737号-8
版权所有:《岩石矿物学杂志》编辑部
主管:中国科学技术协会 主办:中国地质学会岩石学专业委员会 中国地质学会矿物学专业委员会 中国地质科学院地质研究所
技术支持:北京勤云科技发展有限公司

京公网安备 11010202007772号

function PdfOpen(url) { var win="toolbar=no,location=no,directories=no,status=yes,menubar=yes,scrollbars=yes,resizable=yes"; window.open(url,"",win); } function openWin(url,w,h){ var win="toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,width=" + w + ",height=" + h; controlWindow=window.open(url,"",win); } &et=FDB667EBE12004E8C244A5C816A5E088CC70D50948CB3F89615164915887F0D10EBF6FEC8EEF53E48A0DBE531EF3A6BE9A15AAD8B0909D3D04F01C3CBD28A6111E46B44ED0D75E56D677E8BE78E27A3DC318B8715EF9D75AD81330400157AC85A38BAAF168FCF8DAF558DD6E95E1BD9E&pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=25F5F0F8F42BD24D151314EDEA002993&yid=EA357AD73C8E13BC&aid=&vid=&iid=B31275AF3241DB2D&sid=BFB3B49B74E638B4&eid=808D6B9EB5A8B4B4&fileno=20180606&flag=1&is_more=0"> var my_pcid="E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B"; var my_cid="621CF755B1A341E5"; var my_jid="25F5F0F8F42BD24D151314EDEA002993"; var my_yid="EA357AD73C8E13BC"; var my_aid="";