Introduction: We report Modified gaussian model (MGM) deconvolution analyses [2] of reflectance spectrum of the Yamato (Y) 981031. Petrological characteristics of Y981031 had already reported [1]. Absorption features derived from the MGM deconvo-lution are compared with the petrological characteristics of Y981031, and implication of the absorption features are discussed. Finally, we propose sou...

Introduction: Impact-generated hydrothermal systems are often suggested as suitable habitats for primitive life [1,2], but fossil evidence of such colonization are rarely reported in the literature. Here, we report on the occurrence of putative microfossils in a hydrothermal system of the Dellen impact structure, Sweden. Impact-induced hydrothermal systems: Impacts in water-bearing targets can ...

Ureilites are ultramafic achondrites that exhibit heterogeneity in mg# and oxygen isotope ratios between different meteorites. Polymict ureilites represent near-surface material of the ureilite parent asteroid(s). Electron microprobe analyses of >500 olivine and pyroxene clasts in several polymict ureilites reveal a statistically identical range of compositions to that shown by unbrecciated ure...