Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (3): 820-831.doi: 10.13278/j.cnki.jjuese.201503114

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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

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

CLC Number: 

  • P619.224

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