大兴安岭北段吉源地区白音高老组流纹岩锆石U-Pb年龄及地球化学特征
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  • 英文篇名:Zircon U-Pb and geochemical characteristics of rhyolites in Baiyingaolao Formation from Jiyuan area in northern Da Hinggan Mountains
  • 作者:李湜先 ; 赵庆英 ; 邱士龙 ; 郑泽宇
  • 英文作者:LI Shi-xian;ZHAO Qing-ying;QIU Shi-long;ZHENG Ze-yu;College of Earth Sciences,Jilin University;
  • 关键词:大兴安岭北段 ; 白音高老组 ; 流纹岩 ; 锆石U-Pb定年 ; 地球化学特征
  • 英文关键词:northern Da Hinggan Mountains;;Baiyingaolao Formation;;rhyolites;;zircon U-Pb dating;;geochemical characteristics
  • 中文刊名:SJDZ
  • 英文刊名:Global Geology
  • 机构:吉林大学地球科学学院;
  • 出版日期:2019-03-25
  • 出版单位:世界地质
  • 年:2019
  • 期:v.38
  • 基金:国家自然科学基金项目(41340024);; 中国地质调查局项目(1212011121085)联合资助
  • 语种:中文;
  • 页:SJDZ201901010
  • 页数:11
  • CN:01
  • ISSN:22-1111/P
  • 分类号:110-120
摘要
对大兴安岭北段吉源地区白音高老组流纹岩进行了年代学、地球化学测试,结果表明:LA-ICP-MS锆石U-Pb定年显示结晶年龄为(112. 84±0. 81) Ma,属早白垩世;样品具有高硅SiO_2(75. 74%~82. 87%)、富碱K_2O+Na_2O (6. 65%~8. 71%)、贫镁MgO (0. 01%~0. 03%)的特点;具有轻稀土富集,轻重稀土分馏明显[(La/Yb)N=1. 13~5. 46]及明显的Eu负异常;大离子亲石元素Rb、Th、U相对富集,亏损Ba、Sr、Ti等元素,岩石的Rb/Sr值为20. 29~74. 89,Ti/Y值为2. 52~14. 53,Nb/Ta值为12. 25~14. 7。综合研究表明,吉源地区白音高老组流纹岩成分类似于A型花岗岩,岩浆来源于下地壳基性岩石的部分熔融,可能形成于蒙古—鄂霍茨克洋闭合造山后的伸展环境。
        The testing results of chronology and geochemistry of rhyolites in Baiyingaolao Formation from Jiyuan area in northern Da Hinggan Mountains indicate that the LA-ICP-MS zircon U-Pb crystallization age is( 112. 84 ± 0. 81) Ma,which belongs to Early Cretaceous. The rhyolites are characterized by high Si O_2( 75. 74%~ 82. 87%) and K_2 O + Na_2 O( 6. 65% ~ 8. 71%) and low MgO( 0. 01% ~ 0. 03%). They are enriched in LREE,with high LREE/HREE fraction [( La/Yb)N= 1. 13 ~ 5. 46],obvious negative Eu anomalies. They are characterized by the enrichment of large ion lithophile elements( such as Rb,Th and U),depletion in Ba,Sr and Ti. The value of Rb/Sr is 20. 29 ~ 74. 89,Ti/Y is 2. 52 ~ 14. 53,Nb/Ta is 12. 25 ~ 14. 7. Comprehensive studies show that the rhyolites of Baiyingaolao Formation in Jiyuan area are similar to A-type granite. The magma originates from partial melting of basic rocks in the lower crust in an extensional background after the closure of Mongolia-Okhotsk Ocean.
引文
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