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Petrography, mineral chemistry and shock metamorphism of Yamato 984028 lherzolitic shergottite

上传时间:2016-07-18 18:43

【发表年份】2011

【作  者】HU Sen1,2, FENG Lu1,2 & LIN YangTing1

【提交单位】中科院地质与地球物理研究所

【摘  要】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.

【关键词 】Mars, shergottite, lherzolite, Antarctica, shock metamorphism

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