摘要
中国晚新生代碱性玄武岩中贯穿双晶贵橄榄石穆治国，刘如曦，曹正民，孟广新（北京大学地质学系北京１００８７１）关键词晚新生代，碱性玄武岩，贯穿双晶，贵橄榄石，中国１引言Ｂ８０年代至今，在研究我国北方晚新生代碱性重武岩过程中，首先在内蒙的达里诺尔和黑龙江的...
Some chrysolites with an injected twin ones have been found in volcanic rocks in Keluo and Wudalianchi of Heilongjiang Province, in Dalinor of inner Mongolia Autonomous Region, in Kuandiang of Liaoning Province, in Luotuofeng of Hebei Province, in Kardaxi of Xinjiang Autonomous Region as well as in Gaojiang island of the Xisha islands of Hainan Province in the past few years, respectively. Four star-shaped and six star-shaped crystals were formed by a twining plane (031) while 2V angles ranged from 82±2° to 84±2°, negative. mineral. The results of electron probe analysis are: SiO2 38%-39 %, MgO 43%-44%, CaO 0.2%-0.4% and Fo 82-83. These injected twining chrysolites, as the first found, have some identical characteristics in genesis. They were formed in Late-Cenozoic, hosted in strongalkalinebasaltic rocks, and associated with both central eruption and stress.
出处
《地质科学》
CAS
CSCD
北大核心
1994年第4期399-403,T001,共6页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家自然科学基金
关键词
晚新生代
碱性玄武岩
贯穿双晶
贵橄榄石
China
Late-Cenozoic
Alkaline-basalt
Injected twin
Chrysolite
