Journal
CHINESE SCIENCE BULLETIN
Volume 56, Issue 15, Pages 1579-1587Publisher
SCIENCE PRESS
DOI: 10.1007/s11434-011-4443-x
Keywords
Mars; shergottite; lherzolite; Antarctica; shock metamorphism
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Funding
- Chinese Academy of Sciences [KZCX2-YW-110, KZCX2-YW-Q08]
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Y984028 is a new lherzolitic shergottite, consisting of poikilitic and non-poikilitic lithologies. The mafic silicates are FeO-poor, and the chromite is TiO(2)-poor in the poikilitic lithology compared to the grains in the non-poikilitic lithology. This meteorite shares similar mineral petrography and mineral chemistry with GRV 99027, but is not paired with the latter because of their different shock-induced features. Y984028 was severely shocked and experienced no significant thermal metamorphism after the main impact event. Hence, Y984028 serves as a probe for the study of meteorite impact processes on terrestrial surfaces. The melt veins in Y984028 are characterized by the absence of any high-pressure polymorphs, the presence of abundant small mineral fragments, and the prevailing granulation textures of olivine and chromite. These features are consistent with adiabatic melting during the release of shock-induced high-pressure and quenching at ambient pressure.
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