摘要
阜新地区早白垩世义县组火山岩为一套钙碱性系列的基性—中性—中酸性—酸性火山岩组合,是拉张条件下断陷盆地内的火山喷发产物,岩浆来源于地壳.喷发韵律发育,具多期次喷发特点,岩浆演化明显,由基性→中性→酸性演化.由于火山喷发中心的迁移及火山作用时间、方式等因素影响,在各盆地中火山喷发产物具有明显的差异.在阜新-义县盆地内火山喷发产物发育最为完全,它代表了义县组火山岩岩浆演化的全过程.以岩浆演化特征的差异,可划分三个Ⅱ级旋回.
The volcanic rocks in Fuxin area,the calc-alkaline series combination of basic,intermediate,acidic-intermediate and acidic volcanic rocks,are the result of volcanic eruption in the tensional fault basin,with magma derived from the crust.The eruption rhythm is well developed,with characteristics of multi-staged eruption.The magma evolution is obviously from basic through intermediate to acidic.Due to the migration of eruption center,as well as various times and ways of volcanism,the products of eruption in each basin are obviously different.The eruption products in Fuxin-Yixian basin are completely developed,which represent the whole process of the magma evolution of Yixian Formation.The magma evolution can be divided into three cycles of second order by the differences of evolving characteristics.
出处
《地质与资源》
CAS
2014年第A01期21-26,共6页
Geology and Resources
基金
中国地质调查局基础地质调查综合研究项目(编号200113000051)资助
关键词
义县组
钙碱性
断陷盆地
喷发韵律
旋回划分
阜新
辽宁
Yixian Formation
calc-alkaline
fault basin
eruptive rhythm
division of cycles
Fuxin
Liaoning Province
