东北大学学报:自然科学版 ›› 2014, Vol. 35 ›› Issue (3): 443-445.DOI: 10.12068/j.issn.1005-3026.2014.03.031

• 资源与土木工程 • 上一篇    下一篇

大兴安岭柴河流纹质碎斑熔岩锆石U-Pb定年及成因探讨

司秋亮1,崔天日2,王恩德1,门业凯1   

  1. (1. 东北大学 资源与土木工程学院, 辽宁 沈阳110819; 2. 沈阳地质矿产研究所, 辽宁 沈阳110034)
  • 收稿日期:2013-06-12 修回日期:2013-06-12 出版日期:2014-03-15 发布日期:2013-11-22
  • 通讯作者: 司秋亮
  • 作者简介:司秋亮(1982-),男,河南郑州人,东北大学博士研究生,沈阳地质矿产研究所工程师;王恩德(1965-),男,辽宁大连人,东北大学教授,博士生导师.
  • 基金资助:
    教育部高等学校博士学科点专项科研基金资助项目(20110042110032);中国地质调查局基础地质调查成果集成与综合研究项目(1212011121134).

Zircon UPb Dating and Petrogenesis of the Rhyolitic Porphyroclastic Lava in Chaihe Area, Daxinganling Mountains

SI Qiuliang1, CUI Tianri2, WANG Ende1, MEN Yekai1   

  1. 1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China; 2. Shenyang Institute of Geology and Mineral Resources, Shenyang 110034, China.
  • Received:2013-06-12 Revised:2013-06-12 Online:2014-03-15 Published:2013-11-22
  • Contact: SI Qiuliang
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摘要: 为了研究大兴安岭柴河地区流纹质碎斑熔岩的形成时代和岩石成因,进行了锆石U-Pb同位素年龄测试和地球化学分析.LA-ICP-MS锆石U-Pb定年结果显示,柴河流纹质碎斑熔岩形成于年龄为135~138Ma的早白垩世。岩石地球化学研究表明,柴河流纹质碎斑熔岩具有高硅富碱、贫钙镁的特征;稀土丰度总量∑REE介于1501×10-6~1915×10-6,轻重稀土分馏明显,m(La)/m(Yb)N=118~1445,Eu负异常(δEu=059~075);微量元素以富集Rb,Ba,K,亏损Nb,P和Ti为特征,与I型花岗岩相似;碎斑熔岩原始岩浆来源于地壳岩石的部分熔融.

关键词: 流纹质碎斑熔岩, 锆石U-Pb年龄, 地球化学, 大兴安岭, 柴河地区

Abstract: In order to study the formation age and petrogenesis of the rhyolitic porphyroclastic lava in Chaihe area, Daxinganling mountains, ziron UPb isotopic dating and geochemical analysis were used. LAICPMS zircon UPb dating results show that Chaihe rhyolitic porphyroclastic lava formed in early cretaceous from 135 to 138Ma. The geochemical study show that characteristics of the rhyolitic porphyroclastic lava have high silicon and alkalis, poor calcium and magnesium. The total REE abundances ranged from 1501×10-6~1915×10-6, highly fractionated LREE from HREE[m(La)/m(Yb)N=118~1445]and negative Eu anomalies (δEu=059~075). The trace elements are characterized evidently by enrichment of Rb,Ba,K, strong depletion of Nb, P, Ti. The geochemical characteristics show similarity with the Itype granite. The porphyroclastic lava’s original magma is chiefly derived from partial melting of crust.

Key words: rhyolitic porphyroclastic lava, zircon UPb dating, geochemistry, Daxinganling Mountains, Chaihe area

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