吉林大学学报(地球科学版) ›› 2015, Vol. 45 ›› Issue (3): 820-831.doi: 10.13278/j.cnki.jjuese.201503114

• 地质与资源 • 上一篇    下一篇

秦皇岛柳江地区辉绿岩脉特征及其成因

董福湘1, 曹家鑫2, 于红玉3, 闫攀攀4   

  1. 1. 长春工程学院勘查与测绘工程学院, 长春 130012;
    2. 浙江大学海洋学院, 杭州 310058;
    3. 广东省有色金属地质局九四○队, 广东 清远 511520;
    4. 中国建筑材料工业地质勘查中心浙江总队, 杭州 310022
  • 收稿日期:2014-10-20 发布日期:2015-05-26
  • 作者简介:董福湘(1967),女,教授,博士,主要从事地质教学与研究工作,E-mail:dongfuxiang2007@163.com。
  • 基金资助:

    吉林省科技发展计划项目(20140101214JC);国家级大学生创新创业训练计划项目(201211437032)

Characteristics and Cause of Diabase Dikes in Liujiang Area of Qinhuangdao

Dong Fuxiang1, Cao Jiaxin2, Yu Hongyu3, Yan Panpan4   

  1. 1. School of Prospecting & Surveying Engineering, Changchun Institute of Technology, Changchun 130012, China;
    2. Ocean College, Zhejiang University, Hangzhou 310058, China;
    3. Nonferrous Metals Geological Bureau of Guangdong Province 940 Battalion, Qingyuan 511520, Guangdong, China;
    4. China Construction Materials and Geological Prospecting Centre Zhejiang General Team, Hangzhou 310022, China
  • Received:2014-10-20 Published:2015-05-26

摘要:

秦皇岛柳江地区辉绿岩脉主要分布于碳酸盐岩出露区的亮甲山、石门寨、潮水峪西北、砂锅店东北、揣庄北、石岭西北、鸡冠山等地,且多以脉状,岩墙、岩床等形式产出。对柳江地区辉绿岩常量元素的分析表明:w(SiO2)变化较大,且平均值较低;w(FeO+Fe2O3)平均值比基性岩类略偏高;w(Al2O3)、w(CaO)、w(MgO)、w(K2O+Na2O)的平均值均在基性岩类平均值范围内;w(TiO2)的平均值为1.53%。微量元素富集高场强元素Ta、Nb、Zr、Hf,La/Nb>1,表明岩浆上升过程中受到地壳不同程度的混染;稀土元素球粒陨石标准化分布型图各样品基本一致,呈右倾,稀土元素总量较高,轻稀土较重稀土富集,无明显的Eu异常,反映出岩浆演化过程中分离结晶作用并不明显,样品之间的稀土分馏程度相同。分析结果与研究区辉绿岩的岩相学特征相结合,表明柳江地区辉绿岩属于钾玄岩系列,来自于板内环境。结合研究区大地构造背景,认为研究区辉绿岩脉是钾玄质系列玄武质岩浆沿早期断裂或岩层层面灌入冷凝而形成。

关键词: 辉绿岩脉, 岩石化学特征, 成因, 柳江地区

Abstract:

Diabase dikes in Liujiang of Qinhuangdao mainly distribute along the limerock outcropping zone,such as Mount Liangjia,Shimen Village, Chaoshuiyu (northwest), Shaguodian (northeast), Chuaizhuang Village (north), Shiling Ridge (northwest),Mount Jiguan and other regions as veins, dykes, sills,and other output forms. The constant element analysis of diabase in Liujiang indicates that the content of SiO2 varies greatly with a fairly low average. The average content of FeO+Fe2O3 is higher than the average of basic rocks; the average values of Al2O3,CaO,MgO and K2O+Na2O are within the average of basic rocks;the average value of TiO2 is 1.53%; the enrichment of HFSE Ta,Nb, Zr, Hf,La/Nb value is higher than 1;it shows that magma was contaminated by the crust material in different degree during its ascending. The total REE is high, and LREE are more than HREE. The chondrite normalized REE distribution patterns are consistent, tilted to the right, with no obvious Eu anomaly.This reflects that the fractional crystallization is not obvious in magma,and evolution and REE fractionation degree between samples is the same. The petrographic features of the diabase in Liujiang indicate that the diabase in Liujiang was derived from shoshonitic series in the intra-plate rift environment. According to the tectonic setting of the study area, the author concludes that shoshonitic series basaltic magma moved along the fractures, cooled down,then formed the diabase.

Key words: diabase dikes, chemical characteristics of the rock, cause, Liujiang

中图分类号: 

  • P619.224

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