A special unbrecciated granoblastic textured basaltic eucrite meteorite

Generally, we can observe varying degree of ophitic texture or sub-ophitic texture in unbrecciated basaltic eucrites. However, a few unbrecciated basaltic eucrites possess the special characteristic of crystalloblastic texture by high metamorphism, which are called as granoblastic textured basaltic eucrites (Mayne et al. 2009, Mittlefehldt 2015). Up to now, there are only 5 granoblastic textured eucrites having been briefly reported, which have important implications for research on Vesta late thermal metamorphism because of having not completely preserved their original igneous textures. M16341 is the latest confirmation of the unbrecciated granoblastic textured basaltic eucrite, expanded the list of such meteorites, more detailed petrologic characteristics also supplement the previous shortage. It is obvious that the meteorite M16341 have experienced a significant late thermal metamorphism because of rounding and equigranular mineral texture, while the weak shock characteristics indicate that the late thermal metamorphism is related to the magmatic processes. The two-pyroxene thermometer point the thermal equilibrium temperature of meteorite M16341 is ~794 ± 89°C. Additionally, special mineral assemblage of symplectite structure, large size and euhedral zircons and apatites and so on, show that the M16341 meteorite have special and important research value.