CAJ | 학술논문

在渤海湾诸盆地中,唯独辽河盆地东部凹陷发育粗面岩,引起了国内地质学界的广泛关注.本文通过岩石学特征、构造运动背景和形成环境的综合分析认为:粗面岩的原始岩浆来源于上地幔的较深部位,与玄武岩等火成岩属同源岩浆,但粗面岩经历了更长时间的结晶分异作用;形成粗面岩的岩浆,在上涌过程中未经历任何地壳混杂作用,外部环境属于水下喷发;构造运动是岩浆活动和火成岩岩性发育及其分布的内因,东部凹陷沙三中段沉积时期所特有构造运动背景造就了粗面岩发育的内外部环境.
재발해만제분지중,유독료하분지동부요함발육조면암,인기료국내지질학계적엄범관주.본문통과암석학특정、구조운동배경화형성배경적종합분석인위:조면암적원시암장래원우상지만적교심부위,여현무암등화성암속동원암장,단조면암경력료경장시간적결정분이작용;형성조면암적암장,재상용과정중미경력임하지각혼잡작용,외부배경속우수하분발;구조운동시암장활동화화성암암성발육급기분포적내인,동부요함사삼중단침적시기소특유구조운동배경조취료조면암발육적내외부배경.
In various basins of the Bohai Bay,only the East Liaohe depression has well-developed trachyte.This phenomenon has long aroused much attention among geologists in China.Based on an integrated analysis of rock characteristics,tectonic movement and formation background,this paper holds that the original trachyte magma Was derived from the deeper part of the upper mantle,the basalt and other igneous rocks were comagmatic rocks,but the traehyte experienced a longer time of crystallization difierentiation.It is also considered that the formation of trachyte magma in the upwelling process did not experience any mixing action,with the external environment being part of the underwater eruption,that the tectonic movement constituted the internal cause for the develop ment and distribution of magmatic activities and igneous rocks,and that the unique characteristics of the three middle sedimentation periods of the eastern sag created the internal and external environment background for the development of trachyte.