东北大学学报:自然科学版 ›› 2018, Vol. 39 ›› Issue (12): 1779-1782.DOI: 10.12068/j.issn.1005-3026.2018.12.021

• 资源与土木工程 • 上一篇    下一篇

大兴安岭中段哈达陶勒盖组火山岩U-Pb定年及成因

司秋亮1,2 , 王恩德1, 唐振2, 马永非2   

  1. (1. 东北大学 资源与土木工程学院, 辽宁 沈阳110819; 2. 中国地质调查局 沈阳地质调查中心, 辽宁 沈阳110034)
  • 收稿日期:2017-02-24 修回日期:2017-02-24 出版日期:2018-12-15 发布日期:2018-12-19
  • 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,沈阳地质调查中心高级工程师; 王恩德(1957-),男,辽宁大连人,东北大学教授,博士生导师. 冯明杰(1971-), 男, 河南禹州人, 东北大学副教授; 王恩刚(1962-), 男, 辽宁沈阳人, 东北大学教授,博士生导师.
  • 基金资助:
    大兴安岭成矿带突泉-翁牛特地区地质矿产调查(DD20160048); 内蒙古1∶5万五家户等五幅区域地质调查(DD20160048-03)国家自然科学基金资助项目(51171041).

Zircon U-Pb Dating and Petrogenesis of Volcanic Rocks in Hadataolegai Formation, Middle Great Xing’an Range

SI Qiu-liang1,2, WANG En-de1, TANG Zhen2, MA Yong-fei2   

  1. 1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China; 2. Shenyang Center, China Geological Survey, Shenyang 110034, China.
  • Received:2017-02-24 Revised:2017-02-24 Online:2018-12-15 Published:2018-12-19
  • Contact: SI Qiu-liang
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摘要: 为了研究大兴安岭中段哈达陶勒盖组火山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研究.LA-ICP-MS锆石U-Pb定年结果显示,哈达陶勒盖组火山岩形成于234~244Ma的中三叠世.岩石地球化学研究表明,哈达陶勒盖组火山岩具有低硅富碱、富钙镁的特征;稀土丰度总量w(∑RE)= 122.32×10-6~140.66×10-6,轻、重稀土分馏较明显,m(La)/m (Yb)N=11.99~18.68, 无明显Eu负异常(δ○Eu=0.84~0.98),微量元素以富集Rb,K,Ba,Th,亏损Nb,P,Ti为特征.哈达陶勒盖组火山岩岩浆源区为富集的岩石圈地幔, 并遭受了地壳物质的混染.

关键词: 锆石U-Pb年龄, 地球化学, 哈达陶勒盖组, 火山岩, 大兴安岭中段

Abstract: Zircon U-Pb isotopic dating and geochemical analysis were used to study the formation age and petrogenesis of the volcanic rocks in Hadataolegai Formation, the middle Great Xing’an Range. LA-ICP-MS dating results show that the volcanic rocks in Hadataolegai Formation formed in Middle Triassic from 234Ma to 244Ma. The geochemical study suggests that the volcanic rocks are poor in silicon,rich in alkalis, calcium and magnesium. The total RE amount ranges from 122.32×10-6 to 140.66×10-6. Fractionation of LRE and HRE is obvious[m(La)/m(Yb)N=11.99~18.68] and Eu has no anomalies (δEu=0.84~0.98). The trace element geochemistry are characterized evidently by enrichment of Rb, K, Ba, Th, and depletion of Nb, P, Ti. Original magma of the volcanic in Hadataolegai Formation is chiefly derived from enriched lithospheric mantle, and contaminated by crustal material.

Key words: zircon U-Pb dating, geochemistry, Hadataolegai Formation, volcanic rocks, middle Great Xing’an Range

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