Petrography,mineral chemistry and shock metamorphism of Yamato 984028 lherzolitic shergottite |
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Authors: | Sen Hu Lu Feng YangTing Lin |
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Institution: | [1]Key Laboratory of the Earth's Deep Interior, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract: | Y984028 is a new lherzolitic shergottite, consisting of poikilitic and non-poikilitic lithologies. The mafic silicates are
FeO-poor, and the chromite is TiO2-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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Keywords: | Mars shergottite lherzolite Antarctica shock metamorphism |
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