• 首页
  • 学报简介
  • 编委会
  • 投稿指南
  • 订阅指南
  • 过刊浏览
  • 在线投稿
  • 联系我们
  • 网络预出版
  • English

本文将参加年度优秀论文评选,如果您觉得这篇文章很好,请投下您宝贵的一票,谢谢! 支持(2)   不支持(0)

辽东黑沟地区古元古代碱长花岗岩年代学、地球化学、Hf同位素特征及其对辽吉造山带构造演化的制约
投稿时间:2019-07-21  修订日期:2019-09-21  点此下载全文
引用本文:杨玉伟,余超,王广伟,苏特,杨新宇,张天元.2020.辽东黑沟地区古元古代碱长花岗岩年代学、地球化学、Hf同位素特征及其对辽吉造山带构造演化的制约[J].地质学报,94(8):2212-2226.
YANG Yuwei,YU Chao,WANG Guangwei,SU Te,YANG Xinyu,ZHANG Tianyuan.2020.Chronology, geochemistry and zircon Hf isotopes of the Paleoproterozoic alkali feldspar granite from the Heigou area in the eastern Liaoning Province:constraints on the tectonic evolution of the Liao- Ji orogenic belt[J].Acta Geologica Sinica,94(8):2212-2226.
DOI:10.19762/j.cnki.dizhixuebao.2020020
摘要点击次数: 227
全文下载次数: 169
作者单位E-mail
杨玉伟 1) 辽宁省物测勘查院有限责任公司,沈阳,110031 478033166@qq.com 
余超 2) 辽宁省地质矿产调查院有限责任公司,沈阳,110031 286149526@qq.com 
王广伟 2) 辽宁省地质矿产调查院有限责任公司,沈阳,110031  
苏特 2) 辽宁省地质矿产调查院有限责任公司,沈阳,110031  
杨新宇 2) 辽宁省地质矿产调查院有限责任公司,沈阳,110031  
张天元 2) 辽宁省地质矿产调查院有限责任公司,沈阳,110031  
基金项目:本文为中国地质调查局地质调查项目“辽宁1∶5万响水河子等两幅区域地质调查(编号DD20160049- 9)”资助的成果。
中文摘要:华北克拉通东部造山带内古元古代中期(2. 1~2. 2Ga)岩浆记录了造山带早期重要的地壳演化信息,对探讨辽吉造山带古元古代地质演化过程具有十分重要的意义。本文选择了辽东黑沟地区古元古代碱长花岗岩进行岩石学、地球化学、锆石U- Pb年代学和Hf同位素研究。黑沟碱长花岗岩LA- ICP- MS锆石U- Pb测年结果为2186. 5±6. 5Ma,形成时代为古元古代。岩石为碱性、弱过铝质A型花岗岩,岩石富硅、碱,贫钙、镁、铝,极度富钠贫钾,富集Hf、Zr、Nb、Y等高场强元素,亏损Rb、K、Ba等大离子亲石元素,具有较高的(K 2 O+Na 2 O)/Al 2 O 3 、FeO T /MgO、Ga/Al比值,负的Eu异常,稀土元素配分曲线呈右倾海鸥型配分模式。锆石饱和温度介于857~884℃之间,同时具有非常低Sr高Yb特征,指示岩石形成于低压高温的伸展构造背景。锆石 ε Hf ( t )值为-0. 96~+4. 58, 二阶段模式年龄 t DM 2 =2476~2821Ma,明显大于花岗岩的成岩时代,结合岩石地球化学特征指示黑沟碱长花岗岩岩浆源于太古宙TTG片麻岩在地壳浅部伸展条件下的部分熔融。综合区域已有的岩石学、地球化学和同位素特征等资料,辽吉地区在古元古代早期可能处于大陆弧后盆地构造环境,黑沟碱长花岗岩是弧后盆地伸展环境下的产物。
中文关键词:古元古代  辽吉造山带  Hf同位素  A型花岗岩  弧后盆地
 
Chronology, geochemistry and zircon Hf isotopes of the Paleoproterozoic alkali feldspar granite from the Heigou area in the eastern Liaoning Province:constraints on the tectonic evolution of the Liao- Ji orogenic belt
Author NameAffiliationE-mail
YANG Yuwei 1) Geophysical Measuring Exploration Institute of Liaoning Province, Shenyang, 110031 478033166@qq.com 
YU Chao 2) Liaoning Survey Academy of Geology and Mineral Resources Investigation.Shenyang, 110031 286149526@qq.com 
WANG Guangwei 2) Liaoning Survey Academy of Geology and Mineral Resources Investigation.Shenyang, 110031  
SU Te 2) Liaoning Survey Academy of Geology and Mineral Resources Investigation.Shenyang, 110031  
YANG Xinyu 2) Liaoning Survey Academy of Geology and Mineral Resources Investigation.Shenyang, 110031  
ZHANG Tianyuan 2) Liaoning Survey Academy of Geology and Mineral Resources Investigation.Shenyang, 110031  
Abstract:The middle Paleoproterozoic (2. 1~2. 2 Ga) magma in the eastern orogenic belt of the north China craton recorded important crustal evolution information in the early stage of the orogenic belt, which is of great significance for understanding the Paleoproterozoic geological evolution in the Liaoning- Jilin orogenic belt. In this paper, we have studied petrology, geochemistry, zircon U- Pb chronology and Hf isotope characteristics of Paleoproterozoic alkali feldspar granite in the Heigou area, eastern Liaoning province. The zircon U- Pb dating result of the granite by LA- ICP- MS was 2186. 5±6. 5 Ma, and the formation age was Paleoproterozoic. The rocks belong to the alkaline and weakly peraluminous A- type granites. The rocks are high in Si and rich in alkali, poor in Ca, Mg and Al, extremely rich in sodium and poor in potassium. They are also rich in the HFSEs (such as Hf, Zr, Nb, Y), deficient in the LILEs (such as Rb, K, Ba), have high (K 2O+Na 2O)/Al 2O 3, FeOT/MgO, Ga/Al ratios, and negative Eu anomaly. The rare earth elements distribution curve shows the right- leaning seagull pattern. The saturation temperature of zircon ranges is between 857 ℃ and 884 ℃, and has a very low Sr and high Yb characteristic, indicating that the rock was formed in the extensional tectonic background of low pressure and high temperature. ε Hf ( t ) values of zircons in the granites range from -0. 96~+4. 58, and two- stage Hf model ages ( t DM 2 ) are 2476~2821 Ma, which are significantly older than the zircon U- Pb ages of the granites. Combined with lithogeochemical characteristics, it indicates that the Paleoproterozoic granites were derived from partial melting of Archean TTG gneisses under an extensional environment at shallow crustal level. Based on the data of petrology, geochemistry and isotopic characteristics, the Liaoning- Jilin region was likely to be in the tectonic environment of continental back- arc basin in the early Paleoproterozoic, and the Heigou alkali feldspar granite is the product of the extensional environment of back- arc basin.
keywords:Paleoproterozoic  Liao- Ji orogen  zircon Hf isotopes  A- type granites  back- arc basin
查看全文  查看/发表评论  下载PDF阅读器
您是第17613133位访问者  京ICP备05032737号-7  京公网 安备110102004559
版权所有:《地质学报》中文版
主管单位:中国科学技术协会 主办单位:中国地质学会
地  址: 北京市西城区百万庄大街26号 邮编:100037 电话:010-68312410,010-68999025 E-mail: dizhixuebao@163.com
本系统由北京勤云科技发展有限公司设计 

京公网安备 11010202007916号

WeChat