大兴安岭柴河白音高老组流纹岩锆石U-Pb定年及成因探讨

doi:10.12068/j.issn.1005-3026.2016.03.023

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (3): 412-415.DOI: 10.12068/j.issn.1005-3026.2016.03.023

大兴安岭柴河白音高老组流纹岩锆石U-Pb定年及成因探讨

司秋亮^1,2，崔天日²，王恩德¹，丁姝³

(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；3. 沈阳鼎晟隆丰工程技术咨询有限公司，辽宁沈阳110002)

收稿日期:2014-12-29 修回日期:2014-12-29 出版日期:2016-03-15 发布日期:2016-03-07
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高级工程师；王恩德(1957-)，男，辽宁盖州人，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)；中国地质调查局项目(12120113053800).

Zircon U-Pb Dating and Petrogenesis of the Baiyingaolao Formation Rhyolites in Chaihe Area， Great Xing’an Range

SI Qiu-liang^1,2， CUI Tian-ri²， WANG En-de¹， DING Shu³

1.School of Resources & Civil Engineering， Northeastern University， Shenyang 110819，China; 2.Shenyang Institute of Geology and Mineral Resources， Shenyang 110034， China; 3. Shenyang Dingshenglongfeng Project Technology Consulting Co.， Ltd.，Shenyang 110002，China.

Received:2014-12-29 Revised:2014-12-29 Online:2016-03-15 Published:2016-03-07
Contact: SI Qiu-liang
About author:-
Supported by:
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摘要/Abstract

摘要： 为了研究大兴安岭中段柴河地区白音高老组流纹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，白音高老组流纹岩形成于年龄为129~137Ma的早白垩世.岩石地球化学研究表明，白音高老组流纹岩具有高硅富碱、贫钙镁的特征;稀土丰度总量m(∑REE)=121.35×10^-6~194.92 × 10^-6，轻重稀土分馏明显，m(La)/m(Yb)_N=12.2~21.7， Eu负异常(δ_Eu=0.39~0.61)，微量元素以富集Rb，Ba，Th，K，亏损Nb，Sr，P，Ti为特征;白音高老组流纹岩原始岩浆来源于上地壳岩石的部分熔融.

关键词: 锆石U-Pb年龄, 地球化学, 流纹岩, 白音高老组, 柴河地区, 大兴安岭中段

Abstract: Zircon U-Pb istopic dating and geochemical analysis were used to study the formation age and petrogenesis of the rhyolites in Baiyingaolao Formation. LA-ICP-MS dating results show that the Baiyingaolao formation rhyolites in Chaihe area form in early cretaceous from 129 to 137Ma. The geochemical study results show that the rhyolites have the characteristic of high silicon and rich alkalis， poor calcium and magnesium. The total REE amount ranges from 121.35×10^-6 to 194.92× 10^-6. Fractionation of LREE and HREE is obvious［m(La)/m(Yb)_N=12.2~21.7］， and Eu has negative anomalies(δ_Eu=0.39~0.61). The trace elements are characterized evidently by enrichment of Rb，Ba，Th，K and depletion of Nb，Sr，P，Ti. Original magma of Baiyingaolao formation rhyolites is chiefly derived from partial melting of up crust rocks.

Key words: zircon U-Pb dating, geochemistry, rhyolites, Baiyingaolao formation, Chaihe area, central Great Xing’an Range

中图分类号:

司秋亮，崔天日，王恩德，丁姝. 大兴安岭柴河白音高老组流纹岩锆石U-Pb定年及成因探讨[J]. 东北大学学报:自然科学版, 2016, 37(3): 412-415.

SI Qiu-liang， CUI Tian-ri， WANG En-de， DING Shu. Zircon U-Pb Dating and Petrogenesis of the Baiyingaolao Formation Rhyolites in Chaihe Area， Great Xing’an Range[J]. Journal of Northeastern University Natural Science, 2016, 37(3): 412-415.

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大兴安岭柴河白音高老组流纹岩锆石U-Pb定年及成因探讨

Zircon U-Pb Dating and Petrogenesis of the Baiyingaolao Formation Rhyolites in Chaihe Area， Great Xing’an Range

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