加入收藏 设为首页 联系我们
网站首页 | 期刊介绍 | 投稿指南 | 过刊浏览 | 在线订阅 | 留言板 | 联系我们
王利功,王全明,常云真,毕炳坤,李智,王通,张帅军.豫西崤山老里湾岩体年代学、地球化学特征及其成矿作用[J].地质通报,2017,(7):1242-1250.
豫西崤山老里湾岩体年代学、地球化学特征及其成矿作用    点此下载全文
王利功1  2  王全明1  3  常云真2  毕炳坤2  李智2  王通2  张帅军2
1. 中国地质大学地球科学与资源学院, 北京 100083;
2. 河南省地质矿产勘查开发局第一地质矿产调查院, 河南 洛阳 471000;
3. 中国地质调查局发展研究中心, 北京 100037
基金项目:河南省地质勘查基金(周转金)招标项目《河南省崤山地区1:5万区域矿产调查(2012)》(编号:豫国土资发[2009]93号)
DOI:
摘要:
      豫西崤山老里湾岩体位于华北陆块南缘崤山地区东部,是河南省地矿局地矿一院近年新发现的二长花岗岩体。岩体内部已发现多个矿体,为探寻岩体的形成机制及其与成矿作用的关系,对岩体进行了岩石学、年代学、地球化学及岩体内部矿化特征研究,揭示其形成机制及成矿作用。全岩Rb-Sr定年结果显示,老里湾岩体的侵位时间是149±11Ma。岩体的地球化学特征总体表现为高硅、高铝、富碱、低镁的钾玄质、准铝质-过铝质花岗岩;轻稀土元素富集,重稀土元素亏损,轻、重稀土元素强烈分异;δEu=0.62~0.66,具有中等的负Eu异常,富集Rb、Th、U、K等大离子亲石元素,Nb、Ta、P、Ti等高场强元素亏损;岩体具有中等含量Sr,低Yb、Y,揭示源区除石榴子石外还有斜长石残留;岩体形成于加厚地壳向正常地壳减薄的环境。岩体内部矿化特征具有斑岩型矿床的特征,成矿时代属晚侏罗世,老里湾岩体成矿是豫西地区晚侏罗世成矿事件在崤山东部地区的地质响应。老里湾岩体与成矿作用关系密切,找矿前景较好,岩体周边地区应被视为崤山东部重点找矿靶区之一。
关键词:老里湾岩体  Rb-Sr年代学  地球化学  崤山
Rock mass dating, geochemical characteristics and metallogenic role of Laoliwan granite in Xiaoshan area, west He'nan Province    Download Fulltext
WANG Ligong1  2  WANG Quanming1  3  CHANG Yunzhen2  BI Bingkun2  LI Zhi2  WANG Tong2  ZHANG Shuaijun2
1. Faculty of Geosciences and Resources, China University of Geosciences, Beijing 100083, China;
2. No.1 Institute of Geological and Mineral Resources Survey, Henan Bureau of Geology and Mineral Resources Development, Luoyang 471000, He'nan, China;
3. Development and Research Center of China Geological Survey, Beijing 100037, China
Fund Project:
Abstract:
      Laoliwan granite lies in Xiaoshan area on the southern margin of North China Block. It is a granite body discovered re-cently by Henan Provincial Bureau of Geology and Mineral Resources. This granite mainly consists of adamellite. In this granite body several ore deposits have been found. In order to investigate its formation mechanism and metallogenic role, the authors carried out a study in such aspects as petrology, chronology, geochemistry and mineralization. The formation time of Laoliwan granite is 149 ±11Ma, as shown by Rb-Sr dating. It is highly K calc-alkaline and metaluminous-peraluminous, enriched in silica (SiO2=65.81%~68.52%), aluminum (Al2O3=14.52%~14.75%), alkali (K2O+Na2O=6.52%~7.49%) and depleted in MgO (0.21%~0.73%); LREE is rel-atively enriched while HREE is depleted (ΣLREE/ΣHREE=15.69~16.38), with medium negative Eu anomalies (δEu=0.63~0.66). In addition, it is rich in large ion lithophile elements, such as K, U, and Th, poor in high field elements, such as Nb, Ta, P and Ti, and contains medium Sr (265×10-6~415×10-6, averagely 315×10-6), low Y (14.7×10-6~18.8×10-6, averagely 16.7×10-6) and Yb (1.14×10-6~1.37×10-6,averagely 1.26×10-6), suggesting it was formed during the transition from thickened crust to normal crust, with garnet and plagioclase relics. The inner mineralization is similar to feature of porphyry deposits and its mentallogenic age is Late Jurassic. Its metallogenic role is a geological response to the Late Jurassic mineralization event in Yuxi area. So the Laoliwan granite has a close relationship with mentallization. The ore-searching prospect is good, and the area around Laoliwan granite should be con-sidered to be one of the prospecting targets in the east Xiaoshan region.
Keywords:Laoliwan granite  Rb-Sr dating  geochemistry  Xiaoshan
HTML  查看全文  查看/发表评论  下载PDF阅读器
您是本站第 4300867 位访问者
今日访问 1826 
版权所有@《地质通报》 编辑部
本系统由北京勤云科技发展有限公司设计
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=706818331BAA08CD618B97CBCCD0FD61896807ABB1BB08C5CE6760E81F4403A391B930128ECE92A863E7BD282C17731D3AE644EED8BFCD0ABDC43C22BECBE54179E5A8447043CB3BA6AE90384DC2F9D039D49E9E5B0FAA0A145ABC5FD81D5F94DA15FF3409FF5CD7165DC75D9A8A4427012B262B7CF57C806AAC221A318ACBDD&pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=B6579C86F203B551EAEF6FF655601072&yid=FA004A8A4ED1540B&aid=&vid=&iid=DF92D298D3FF1E6E&sid=D92306F676C2377C&eid=49833082E2634437&fileno=20170713&flag=1&is_more=0"> var my_pcid="E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B"; var my_cid="621CF755B1A341E5"; var my_jid="B6579C86F203B551EAEF6FF655601072"; var my_yid="FA004A8A4ED1540B"; var my_aid="";