极地研究2025，Vol.37Issue(3)：510-521,12.DOI:10.13679/j.jdyj.20240044
顽火辉石球粒陨石GRV 13100两类球粒和NWA 13632热变质历史对比
Comparison of the thermal metamorphic history between two types of chon-drules in GRV 13100 and NWA 13632 enstatite chondrites
摘要
Abstract
The characteristics of petrology and mineralogy for porphyritic olivine pyroxene chondrule and barred pyroxene chondrule in GRV 13100(EH4)and the whole rock in NWA 13632(EH6)enstatite chondrite are reported in this paper,and the comparative study of their thermal metamorphic history are carried out.Two different cathodolumine-scence olivine,thermometers of oldhamite of porphyritic olivine pyroxene chon-drule in GRV 13100 show that the chondrule have undergone incomplete melting of 800～900℃and rapid cooling crystallization.The barred pyroxene chondrule in GRV 13100 underwent complete high-temperature melting higher than 1315℃,and the cooling rate was greater than 1 000℃·h-1.Their thermal metamorphic characteristics conform to the"rubble pile model",and the metamorphic heat source comes from the impact energy.NWA 13632 enstatite chondrite has a high degree of thermal metamorphism(type 6)and weathering(W3),a blurred boundary between chondrule and matrix,a low impact metamorphism(S2),no impact melt-ing phenomenon;The olivine and silica phases are absent in the residual spherules and matrix.Compared with GRV 13100,the Mn content of enstatite and troilite in NWA 13632 is low,and the secondary plagio-clase and pyroxene form an equigranular texture in some areas.So,its thermal metamorphism characteristics are consistent with the"onion model".NWA13632 meteorite may have formed deep within its parent body and was heated by the decay of radioactive elements.关键词
顽火辉石球粒陨石/岩石学/矿物学/热变质/GRV 13100/NWA 13632Key words
enstatite chondrite/petrology/mineralogy/thermal metamorphism/GRV 13100/NWA 13632引用本文复制引用
高旭凯,谢兰芳,陈宏毅,杨姗姗,夏志鹏,殷一曼,赵妍菲..顽火辉石球粒陨石GRV 13100两类球粒和NWA 13632热变质历史对比[J].极地研究,2025,37(3):510-521,12.基金项目
国家自然科学基金(42473051)、广西自然科学基金(2025GXNSFAA069991)、广西科技基地与人才专项(桂科AD23026339)和桂林理工大学科研启动金(RD2400003226)资助 （42473051）
