摘要
长白山地区新生代火山岩是一套玄武岩、粗面岩和钠闪碱流岩的双峰式火山岩组合。玄武岩类分别属于碱性玄武岩系列和拉斑玄武岩系列。奶头山期玄武岩是幔源原生岩浆直接喷发于地表的产物,其他各期玄武岩是幔源原生岩浆经历了一定程度分异作用的产物。粗面岩和钠闪碱流岩与玄武岩有成因联系,可能是玄武岩浆通过分离结晶作用而形成的。本区新生代火山岩是大陆裂谷构造环境下的产物,是在地幔增温和底辞上升过程中形成的。
The Cenozoic volcanic rocks in the Changbaishan region, an bimodal assemblage of basalt-trachyte-comendite,have the major and trace element geochemical characteristics similar to those of the volcanic rccks in the continental rift. The basalts in this region belong to alkali basaltic and tholeiitic series. Naitoushan basalt represents primary magma and the others evolved magmas with different degrees. Baitoushan volcanic rocks(trachyte and comendite) may have a crystallization relationship with the basalts. The Cenozoic volcanic rocks, bound up with the uplift and heat-increase of the upper mantle, were formed under the continental rift.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
1989年第2期49-64,共16页
Acta Petrologica Sinica
关键词
新生代
火山岩
岩石成因
长白山区
Cenozoic
Basalt
Trachyte
Comendite
Changbaishan
Bimodal
Trace element
Feldspar
Clinopyroxene
