HUGONIOT PARAMETERS OF SEVERAL MAIN TYPES OF METEORITES

Hugoniot parameters of iron meteorite, EHand ELenstatite chondrites, H-,L-, LL-group ordinary chondrites are determined by using the volume additivitymethod based on their model chemical or mineral compositions. The Hugoniotparameters of several main types of meteorites are evaluated as following: iron meteorite, ρ₀ = 7.78 g/cm³, c₀ = 4.342 km/s, s = 0.489 (P <30GPa); c₀ = 3.610km/s,s = 1.623 (30 GPa ≤ P ≤ 270 GPa); EH-group enstatite chondrite, P₀ = 3.8g/cm³,c₀ = 3.978km/s, s = 1.422 (P ≤50GPa); c₀ = 3.377km/s, s = l.552 (60GPa ≤ P ≤120 GPa); EL-group enstatite chondrite, ρ₀ = 3.6g/cm³, c₀ = 4.821 km/s, s = l.115(P ≤ 50GPa); c₀ = 3.644km/s, s = 1.552 (60GPa ≤ P ≤ 120GPa); H-group ordinary chondrite, ρ₀= 3.5 g/cm³, c₀ = 4.459km/s, s = 1.143 (P ≤ 120GPa); L-groupordinary chondrite, p₀ = 3.2g/cm³, c₀ = 4.418 km/s, s = 1.145 (P ≤ 120GPa); LL group ordinary chondrite, ρ₀ = 3.0 g/cm³, c₀ = 4.012 km/s, s = 1.194 (P ≤ 120 GPa).The above calculated Hugoniot parameters are in agreement with experimentallymeasured data reported for the same types of meteorites. In addition, the residual temperature (corresponding to shock metamorphism temperature) of ordinarychondrites (H-, L-, LL-group) are estimated, and the temperature ranges of shockstages (S1-S6(7)) of ordinary chondrites are scaled. They are: S1 (0-5 GPa):<300 K; S2 (5-10 GPa): <300 K; S3 (10-20GPa): 300We400K; S4 (20-40 GPa):350 (±50)-700 (±100)K; S5 (40-70GPa): 700 (±100)-1400 (±250)K; S6 (70-100 GPa): 1400 (±300)-2100 (±300)K; S7 (>100 GPa): >2100 (±300)K. This temperature calibration are based on the assumption that the initial temperature ofordinary chondrites suffered shock loading is around 173 K.