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 chondrule 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 melting 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 plagioclase 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.

Key words: enstatite chondrite, petrology, mineralogy, thermal metamorphism, GRV 13100, NWA 13632