摘要
对渤海湾盆地第三系火山岩及其成因进行的研究表明 ,渤海湾盆地火山岩主要为玄武岩 ,其次是辉绿岩 ,局部分布有少量安山岩、玄武安山岩、粗面岩、火山碎屑岩 ;辽河坳陷基本为高钾玄武岩 ;黄骅坳陷火山岩与济阳坳陷相似 ,既有高钾玄武岩 ,也有中钾玄武岩。全盆地范围内玄武岩基本上为碱性玄武岩 ,少量为亚碱性玄武岩。所有喷出相的火山岩 (包括玄武岩和火山碎屑岩 )中铕 (Eu)异常均不明显 ,δEu近于 1,因此岩石形成过程中未曾发生铕的亏损或富集事件。这说明原始玄武岩浆生成后 ,在整个上升和结晶过程中未受到地壳物质的强烈混染 ,各期玄武岩均是幔源原生岩浆固结的产物。而侵入相的辉绿岩中铕的含量则有明显的正异常 ,这可能与岩浆能量较弱、上升速度较慢及发生分离结晶作用有关。
Lithology of volcanic rocks, series and evolvement of magma are studied based on thin section and petrochemical analysis of Bohai Bay basin in Tertiary. Basalts are the primary rocks in Bohai Bay basin. There are almost basalts with high potassium type in Liaohe depression, and those with high to medium types in Huanghua and Jiyang depressions. The most basalts belong to alkali basalts, and the rest are sub\|alkali basalts Magmas of all extrusive rocks came from the mattle, and they were not hybridised. Diapirism of asthenosphere and regional stress field result in the appearance of Bohai Bay basin.
出处
《石油大学学报（自然科学版）》
CSCD
北大核心
2001年第1期22-26,共5页
Journal of the University of Petroleum,China(Edition of Natural Science)
基金
中国石油天然气集团公司"九五"科技攻关项目!(970 2 0 6 -0 2 -0 1-18)
