[an error occurred while processing this directive] 世界地质 2018, 37(4) 1047-1057,1084 DOI:   10.3969/j.issn.1004-5589.2018.04.005  ISSN: 1004-5589 CN: 22-1111/P

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敦密断裂带
霓辉粗面岩
玄武岩
地球化学
K-Ar年龄
本文作者相关文章
邸新
贾海明
于宏斌
聂立军
PubMed
Article by Di X
Article by Jia H
Article by Yu H
Article by Nie L
吉林东部敦(化)-密(山)断裂带内碱性粗面岩同位素年代学、岩石化学及地质意义
邸新1, 贾海明2, 于宏斌1, 聂立军1
1. 吉林省区域地质矿产调查所, 长春 130022;
2. 吉林省地质调查院, 长春 130102
摘要: 吉林敦化-密山断裂带北段琵河口-黄泥河镇之间新发现有多处的霓辉粗面岩,岩石以普遍富含碱性矿物霓辉石为特点,均呈整合接触覆盖于船底山期碱性玄武岩之上,具高位喷发、低位充填特点,全岩K-Ar年龄测定结果(25.64±0.53 Ma、27.36±0.45 Ma、28.45±0.56 Ma、28.55±0.43 Ma、28.63±0.45 Ma、28.65±0.61 Ma)属渐新世。地球化学数据显示,霓辉粗面岩SiO2质量分数均值为59.05%,富碱、高钾,亏损大离子亲石元素(Sr、Ba、V、Cr),富集高场强元素(Nb、Ta、Hf、Zr)和轻稀土元素(LREE),∑REE含量很高,具有右倾型稀土分配型式,显示明显Eu负异常。研究表明,霓辉粗面岩是由碱性玄武质岩浆经强烈分离结晶作用形成的,揭示该区渐新世处于一种强烈的拉张环境,幔源岩浆经历了由碱性玄武岩-碱性粗面岩的演化过程。
关键词 敦密断裂带   霓辉粗面岩   玄武岩   地球化学   K-Ar年龄  
Geochronology, geochemistry and its geological implications of alkaline trachyte from Dunhua-Mishan fault belt, eastern Jilin
DI Xin1, JIA Hai-ming2, YU Hong-bin1, NIE Li-jun1
1. Survey of Regional Geological & Mineral Resources of Jilin Province, Changchun 130022, China;
2. Geological Survey of Jilin Province, Changchun 130102, China
Abstract: Aegirine trachytes were newly recognized in northern Dunhua-Mishan fault belt, between the Bahekou and Huangnihe towns, Jilin Province. Aegirine trachytes are characterized by enrichment in alkaline minerals represented by aegirine, conformably overlying the alkaline basalt of Chuanfishan Period. Whole-rock K-Ar isotopic dating reveals ages of 25.64±0.53 Ma, 27.36±0.45 Ma, 28.45±0.56 Ma, 28.55±0.43 Ma, 28.63±0.45 Ma and 28.65±0.61 Ma, which belong to Oligocene. The geochemical analysis shows average SiO2 content of 59.05% for the aegirine trachytes, with high alkaline and enriched K2O contents. They are depleted in LILEs(Sr, Ba, V, Cr)and enriched in HFSEs(Nb, Ta, Hf, Zr)and LREE, with high ∑REE abundances, right-inclined REE distribution patterns and obvious negative Eu anomalies.Integrating all the results, it is indicated that the aegirine trachytes were derived from strongly fractioned crystallization of alkaline basaltic magma, under an intensive extensional setting during Oligocene and the mantle-derived magma evolved from alkaline basalt to aegirine trachyte.
Keywords: Dunhua-Mishan fault belt   aegirine trachyte   geochemistry   whole-rock K-Ar isotopic age  
收稿日期 2018-03-16 修回日期 2018-11-05 网络版发布日期  
DOI: 10.3969/j.issn.1004-5589.2018.04.005
基金项目:

中国地质调查局项目(1212011120732).

通讯作者: 贾海明(1970-),男,高级工程师,主要从事区域地质调查及矿产勘查工作.E-mail:18943186653@163.com
作者简介:
作者Email: 18943186653@163.com

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