石油与天然气地质 ›› 1997, Vol. 18 ›› Issue (4): 309-313.doi: 10.11743/ogg19970409

• 论文 • 上一篇    下一篇

张强凹陷及邻区火山岩特征与构造属性

陈全茂1, 张光亚1, 梁晓东1, 陈昭年1, 周绍强2, 王占忠2   

  1. 1. 中国地质大学石油系 湖北武汉 430074;
    2. 辽河石油勘探局 辽宁盘锦 124010
  • 收稿日期:1996-02-08 修回日期:1996-05-06 出版日期:1997-12-25 发布日期:2012-01-18

PROPERTIES OF VOLCANIC ROCKS AND STRUCTURAL ATTRIBUTES IN ZHANGQIANG DEPRESSION AND ITS NEIGHBOURING AREA

Chen Quanmao1, Zhang Guangya1, Liang Xiaodong1, Chen Zhaonian1, Zhou Shaoqiang2, Wang Zhanzhong2   

  1. 1. China University of Geosciences, Wuhan, Hubei;
    2. Liaohe Bureau of Petroleum Exploration, Panjin, Liaoning
  • Received:1996-02-08 Revised:1996-05-06 Online:1997-12-25 Published:2012-01-18

PDF (PC)

812

被引次数

7

摘要：

火山岩地球化学特征与构造背景关系十分密切。经分析,张强凹陷及邻区大洼昌图凹陷的火山岩具有以下特征:(1)火山岩都为中酸性,以碱性玄武岩系列为主;(2)张强凹陷火山岩属既有钾质也有钠质的碱性玄武岩,另外还有钙碱性和大陆型拉斑玄武岩,邻区大洼昌图凹陷火山岩全部为钠质碱性玄武岩;(3)张强凹陷和邻区大洼昌图凹陷火山岩的球粒陨石标准化稀土元素分配曲线向右倾斜,轻稀土富集;(4)微量元素Zr-Ce,Zr-La图解上,张强凹陷与大洼昌图凹陷差别明显。这些特征表明,张强凹陷及邻区大洼昌图凹陷的火山岩均为大陆裂谷活动的产物,但张强凹陷发育时间稍早;张强凹陷与大洼昌图凹陷火山岩的岩浆来源不同,应分属不同的构造单元。

关键词: 张强凹陷, 构造属性, 形成环境, 玄武岩, 火山岩系列, 稀土元素, 微量元素

Abstract:

The geochemical properties of volcanic rocks bear close relations with structural background.It has been proved by analysis result that volcanic rocks in Zhangqiang and its neighbouning Dawa Changtu Depressions have following characteristics:(1)the volcanic rocks are neutral acid,and most of them are alkaline basalt;(2)the volcanic rocks are sodium alkaline basalts in Dawa Changtu Depression,but sodium and potassium alkaline basalts as well as calc alkali and continental tholeiitic basalts in Zhangqiang Depression;(3)the standard rare earth element distribution curves of chondrite in the volcanic rocks tilted rightwards and light rare earth element are rich in the rocks.(4)Zr-Ce and Zr-La diagrams show distinct differences between the two depressions.It is suggested that the volcanic rocks in the two depressions are all resulted from continental rift,the magma sources are different and should belong to different tectonic units.