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首页> 中文期刊> 《极地科学进展：英文版》 >Petrology of ureilites from Grove Mountains,Antarctica:Constraints on the origins

Petrology of ureilites from Grove Mountains,Antarctica:Constraints on the origins

         
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摘要

Ureilites are a common group of achondrites with a high abundance of carbon.They probably have a genetic relationship with chondrites,hence provide an insight into origin and evolution of terrestrial planets.A new meteorite-rich region,Grove Mountains(GRV),was found by the Chinese Antarctic Research Expedition,with discovery of 9834 meteorites.Of 2433 meteorites classified,9 ureilites have been identified.In this paper,we report petrography of 6 of these ureilites.Four ureilites contain graphite and exhibit triangle conjunction and common reduced margins of olivine.GRV 052382 probably experienced heavy shock metamorphism followed by fast cooling,as indicated by mosaic texture or fine-grained granular texture of olivine.GRV 022931 was highly reduced of these ureilites,with olivine as isolated grains in abundant carbonaceous matrix.All 9 ureilites are monomict,and are classified into subtype II(with medium FeO content,Fa15-18)and subtype I(with high FeO content,Fa>18)based on compositions of the cores of olivine.The diverse mineral compositions and petrography of these ureilites suggest that they are not paired and reveal a multi-event history of the parent body.Partial melting of the parent body produced carbon-rich magma,followed by crystallization of graphite and silicates.Later,graphite was partially inverted to diamond by shock events.Reburial of the shocked debris experienced various degree of thermal metamorphism.Finally,these rocks were excavated from the parent asteroid and ejected into Earth-cross orbit by another impact event.

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