桂林理工大学学报2018，Vol.38Issue(4)：674-679,6.DOI:10.3969/j.issn.1674-9057.2018.04.008
3块钙长辉长无球粒陨石中辉石的热变质特征及其成因分析
Thermal metamorphism characteristics and origin of pyroxenes in three eucrites
摘要
Abstract
Eucirtes are the most common HED meteorites. Their prominent characteristics are the widespread development of thermal metamorphism. Pyroxene is the main mineral composition of this type of meteorite. This mineral is most affected by thermal metamorphism, so the mechanism of thermal metamorphism is a research focus. This paper analyzes the petrological characteristics and the mineral composition of pyroxenes of a group of eucirtes by BSE images and EPMA method. Based on the characteristics of petrology,thermal metamorphism and composition of pyroxenes,these meteorites with structures of coarse crystal accumulated gabbro,ophitic and basaltic textures from gabbro,diabase and basalt respectively,the width of the melt belts,the complexity of melt combination,the diameter of recrystallized particles are increasing,while the depth of crystallization from deep to shallow. The compositions of pyroxenes change from hypersthene (Fs34. 1 - 62. 9Wo1. 83 - 4. 96) to pigeonite(Fs44. 1 - 65. 3Wo5. 11 - 22. 3) and augite (Fs14. 2 - 47. 7Wo25. 0 - 45. 0) . These evidences prove that the heat source came from upper covering layer,not from lower rocks. The analysis above shows that the cause of this common metamorphism may result from rapid burial of early basalts by later flows caused by high effusion rates on the mother body.关键词
钙长辉长无球粒陨石/玄武岩/辉石/热变质Key words
eucirte/basalt/pyroxene/thermal metamorphism!分类
天文与地球科学引用本文复制引用
陈宏毅,周剑凯,谢兰芳,缪秉魁..3块钙长辉长无球粒陨石中辉石的热变质特征及其成因分析[J].桂林理工大学学报,2018,38(4):674-679,6.基金项目
国家自然科学基金项目(41866008) （41866008）
广西科技计划项目(桂科AD16450001) （桂科AD16450001）
