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大兴安岭克一河地区满克头鄂博组火山岩形成时代、地球化学特征及地质意义
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  • 英文篇名:Formation age and geochemical characteristics of volcanic rocks from Manketouebo Formation in Keyihe area,Da Higgan Moutains and its tectonic implications
  • 作者:杜洋 ; 刘正宏 ; 崔维龙 ; 王师捷 ; 王阳 ; 杜传业
  • 英文作者:DU Yang;LIU Zheng-hong;CUI Wei-long;WANG Shi-jie;WANG Yang;DU Chuan-ye;College of Earth Sciences,Jilin University;
  • 关键词:大兴安岭北段 ; 满克头鄂博组 ; 火山岩 ; 锆石U-Pb定年
  • 英文关键词:northern Da Hinggan Mountains;;Manketouebo Formation;;volcanic rocks;;zircon U-Pb dating
  • 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:2017-03-25
  • 出版单位:世界地质
  • 年:2017
  • 期:v.36
  • 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:SJDZ201701005
  • 页数:12
  • CN:01
  • ISSN:22-1111/P
  • 分类号:57-68
摘要
大兴安岭北段克一河地区满克头鄂博组岩石主体岩性为流纹质、英安质火山岩,火山岩TAS图解中显示其为流纹岩。LA-ICP-MS锆石U-Pb定年结果显示,其形成于(139±2)Ma。火山岩多为高钾钙碱性系列,具有高SiO_2和全碱含量。稀土元素总量较低(ΣREE=137.34×10~(-6)~191.18×10~(-6)),轻重稀土元素分馏明显((La/Yb)_N=12.57~22.25),具中等负Eu异常(δEu=0.40~0.72)。富集大离子亲石元素Rb、Th、U和轻稀土元素,亏损高场强元素Nb、Ta、P、Ti。岩石Sr平均值为115×10~(-6),Yb的平均值为1.70×10~(-6),Y/Yb平均值为9.46,(Ho/Yb)_N平均值为1.04,且具负的Eu异常,暗示岩浆可能来源于加厚麻粒岩下地壳部分熔融,结合区域特征,推测该火山岩可能形成于蒙古—鄂霍茨克洋闭合碰撞造山所导致的地壳加厚环境。
        Petrographically,the volcanic rocks in Manketouebo Formation from keyihe area northern Da Hinggan Mountains are mainly composed of rhyolitic and dacitic volcanic rocks. The TAS diagram displays that they are rhyolite. LA-ICP-MS zircon U-Pb dating results show that they formed at 139 ± 2Ma. The volcanic rocks,which are rich in SiO_2 and alkalis,belong to high K Calc alkaline series. They are low in total rare earth elements(ΣREE = 137. 34 × 10~(-6)~ 191. 18 × 10~(-6)),whilst highly fractionated LREE from HREE((La/Yb)_N= 12. 57 ~22. 25),with moderately negative Eu anomalies(δEu = 0. 40 ~ 0. 72). They are characterized by the enrichment of large ion lithophile elements( such as Rb,Th and U) and LREE,and deplection of high field strength elements( such as Nb,Ta,P,and Ti). The average value of Sr is 115 × 10~(-6),Yb is 1. 70 × 10~(-6),Y/Yb is 9. 46,(Ho/Yb)_N is 1. 04,with negative Eu indicating that the magmas of these volcanic rocks are derived from partial melting of the granulite fracies of thickened lower crust. Integrating regional geology,it is suggested that the formation of the volcanic rocks were related to the crustal thickening during the closure of Mongol-Okhotsk Ocean.
引文
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