1 Introduction The howardite,eucrite and diogenite(HED)meteorites are ultramafic and mafic igneous rocks and impact-engendered breccias derived from a thoroughly differentiated asteroid 4 Vesta.Diogenites include duni...1 Introduction The howardite,eucrite and diogenite(HED)meteorites are ultramafic and mafic igneous rocks and impact-engendered breccias derived from a thoroughly differentiated asteroid 4 Vesta.Diogenites include dunites,展开更多
Grove Mountains （GRV） 051523 is a newly identified eucrite, consisting mainly of coarse-grained pyroxene （62.9 vol% ） and plagioclase （34.2 vol% ）, with less abundant opaque minerals （2.7 vol% ）, minor silica ...Grove Mountains （GRV） 051523 is a newly identified eucrite, consisting mainly of coarse-grained pyroxene （62.9 vol% ） and plagioclase （34.2 vol% ）, with less abundant opaque minerals （2.7 vol% ）, minor silica and tiny FeO-rich olivine （FaTs）. Coarse-grained pyroxenes show exsolution of augite lamellae in pigeonite or vice versa. Width of most exsolution lamellae in pyroxenes is 1-3 μm. Opaque minerals are mainly chromite, ilmenite and sulfides. The meteorite was heavily shocked, as indicated by breccias and melt veins. Coarse-grained pyroxenes commonly contain abundant tiny or needle-like chromite inclusions with orientation, probably due to heavy shock events. Pyroxenes in various petrographic occurrences exhibit highly homogeneous compositions, indicating that GRV 051523 experienced intense thermal metamorphism in the parent asteroid 4 Vesta. GRV 051523 is classified as Type 5-6. This new eucrite will have additional constraints on chemical composition, magmatic differentiation, multi-stage shock and thermal history of Vesta.展开更多
基金funded by the National Natural Science Foundation of China (Grant No. 41173077)Chinese science and technology basic conditions platform project of Ministryof Science and Technology (2005DKA21406-9)Science and technology plan projects in guangxi(AD16450001)
文摘1 Introduction The howardite,eucrite and diogenite(HED)meteorites are ultramafic and mafic igneous rocks and impact-engendered breccias derived from a thoroughly differentiated asteroid 4 Vesta.Diogenites include dunites,
基金supported by the Knowledge-Innovation Program(kzcx2-yw-110,KZCX2-YW-Q08)One-Hundred-Talent Program of the Chinese Academy of Sciences
文摘Grove Mountains （GRV） 051523 is a newly identified eucrite, consisting mainly of coarse-grained pyroxene （62.9 vol% ） and plagioclase （34.2 vol% ）, with less abundant opaque minerals （2.7 vol% ）, minor silica and tiny FeO-rich olivine （FaTs）. Coarse-grained pyroxenes show exsolution of augite lamellae in pigeonite or vice versa. Width of most exsolution lamellae in pyroxenes is 1-3 μm. Opaque minerals are mainly chromite, ilmenite and sulfides. The meteorite was heavily shocked, as indicated by breccias and melt veins. Coarse-grained pyroxenes commonly contain abundant tiny or needle-like chromite inclusions with orientation, probably due to heavy shock events. Pyroxenes in various petrographic occurrences exhibit highly homogeneous compositions, indicating that GRV 051523 experienced intense thermal metamorphism in the parent asteroid 4 Vesta. GRV 051523 is classified as Type 5-6. This new eucrite will have additional constraints on chemical composition, magmatic differentiation, multi-stage shock and thermal history of Vesta.
