赤峰市平庄—元宝山盆地汉诺坝玄武岩的地球化学特征及其构造背景

doi:10.12068/j.issn.1005-3026.2015.04.029

东北大学学报:自然科学版 ›› 2015, Vol. 36 ›› Issue (4): 590-595.DOI: 10.12068/j.issn.1005-3026.2015.04.029

赤峰市平庄—元宝山盆地汉诺坝玄武岩的地球化学特征及其构造背景

彭艳东¹，黄菲²，邢德和³，张志斌³

(1.东北大学秦皇岛分校资源与材料学院，河北秦皇岛066004；2.东北大学资源与土木工程学院，辽宁沈阳110819； 3.沈阳地质矿产研究所，辽宁沈阳110034)

收稿日期:2014-04-23 修回日期:2014-04-23 出版日期:2015-04-15 发布日期:2014-11-07
通讯作者: -
作者简介:彭艳东 (1963-)，男，河北唐山人，东北大学教授；黄菲(1959-)，女，江苏扬州人，东北大学教授.
基金资助:
国家自然科学基金资助项目(41272062)；国土资源大调查项目(1212011120662).

Geochemical Characteristics and Tectonic Setting of Hannuoba Basalts from Pingzhuang—Yuanbaoshan Basin in Chifeng

PENG Yan-dong¹， HUANG Fei²， XING De-he³， ZHANG Zhi-bin³

1.School of Resources and Materials， Northeastern University at Qinhuangdao， Qinhuangdao 066004， China; 2. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China; 3. Shenyang Institute of Geology and Mineral Resources， Shenyang 110034，China.

Received:2014-04-23 Revised:2014-04-23 Online:2015-04-15 Published:2014-11-07
Contact: HUANG Fei
About author:-
Supported by:
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摘要/Abstract

摘要： 对分布于赤峰东部平庄—元宝山盆地的汉诺坝玄武岩进行了岩石学、地球化学研究.结果表明，研究区内火山岩主要岩石类型为玄武岩及少量沉凝灰岩.玄武岩岩石成分较均一，主量元素变化不大，富钛、贫铝，富Na₂O，低K₂O.玄武岩稀土元素总量低，轻稀土元素富集，铕、铈异常不明显.玄武岩富集大离子亲石元素Rb，Ba，Th，K，Ta和LREE，高场强元素U相对亏损，相容元素Cr，Co，Ni含量较低.本区汉诺坝玄武岩属于拉斑玄武岩系列，火山岩的源区是软流圈上地幔，玄武岩形成于大陆裂谷的拉伸环境，是大陆板块内部稳定构造环境的产物.

关键词: 赤峰, 平庄—元宝山盆地, 地球化学, 拉斑玄武岩, 大陆裂谷

Abstract: Petrology， geochemistry characteristics of the Hannuoba basalts distributed in Pingzhuang—Yuanbaoshan basin in eastern of Chifeng， Inner Mongolia were studied. The results showed that the volcanic rocks are dominated by basalts and minor sedimentary tuff. The petrologic compositions of basalts are homogeneous， content of the main elements change rarely， the basalts is characterized by higher titanium， lower aluminum and high Na₂O content，lower K₂O content. The total amounts of REE are lower， LREE is enriched， and there are weak Eu and weak Ce negative anomaly for Hannuoba basalts. The basalts are obviously enriched inlithophile elements (Rb，Ba，Th，K，Ta， LREE etc.)， and depleted in high field-strength element(U，HREE)as well as compatible elements (Co， Ni， Cr etc.). The Hannuoba basalts belong to the tholeiitic basalt series， and the source region of volcano rock is the asthenospheric upper mantle.The Hannuoba basalt formed in a continental rift tensile environment which is the product of continental intraplate stable tectonic environment.

Key words: Chifeng, Pingzhuang—Yuanbaoshan basin, geochemistry, Tholeiitic basalt, continental rift

中图分类号:

P591

彭艳东，黄菲，邢德和，张志斌. 赤峰市平庄—元宝山盆地汉诺坝玄武岩的地球化学特征及其构造背景[J]. 东北大学学报:自然科学版, 2015, 36(4): 590-595.

PENG Yan-dong， HUANG Fei， XING De-he， ZHANG Zhi-bin. Geochemical Characteristics and Tectonic Setting of Hannuoba Basalts from Pingzhuang—Yuanbaoshan Basin in Chifeng[J]. Journal of Northeastern University Natural Science, 2015, 36(4): 590-595.

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赤峰市平庄—元宝山盆地汉诺坝玄武岩的地球化学特征及其构造背景

Geochemical Characteristics and Tectonic Setting of Hannuoba Basalts from Pingzhuang—Yuanbaoshan Basin in Chifeng

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