Introduction: Two main types of unmelted mi-crometeorite are recognised: (1) fine-grained micro-meteorites (fgMMs), dominated by phyllosilicates, and (2) coarse-grained micrometeorites (cgMMs), dominated by anhydrous silicates and glass with magmatic textures [1]. Fine-grained MMs have close affinities to the matrices of CI, CM2 and CR2 chondrites, however, the other major components of these m...

Introduction: Nakhlites are augite-rich cumulate rocks with variable amounts of olivine and groundmass plus minor Fe, Ti oxides [e.g., 1]. Our previous studies revealed that nakhlites showed correlated petrography and mineralogy that could be explained by different locations (burial depths) in a common cooling cumulate pile [e.g., 2]. We so far analyzed six of the seven currently known nakhlite...

Introduction: We present the first mineralogical and oxygen isotope data for the new eucrite Northwest Africa (NWA) 5073 that has some unique features. This meteorite is a desert find with a total mass of 185 g and represents a non-brecciated unequili-brated eucrite with the coarsest texture ever found among samples of the HED suite. Results: NWA 5073 has a basaltic texture, mainly composed of ...

Abstract Phosphorus X‐ray maps of olivine phenocrysts in many type II (FeO‐rich) porphyritic chondrules LL3.00 Semarkona and CO3.05 Y 81020 reveal multiple sets thin dark/bright (P‐poor/P‐rich) layers that resemble oscillatory zoning. Such discrete are generally not evident BSE images or Fe, Cr, Ca, Al, Mg, Mn because rapid diffusion these cations at high temperatures smoothed out their initial...

Chondrules from unequilibrated ordinary chondrites are among the oldest Solar system materials and preserve mineralogical, chemical isotopic signatures that link them to their primary formation mechanisms environments in early System. Some chondrules record features indicating modifications by high- low-temperature processes throughout residence time protoplanetary disk. were partially modified...

Introduction: Primary igneous plagioclase is found in approximately 10 % of type I chondrules in CO chondrites [1]. The presence of plagioclase has potential to help interpret conditions of chondrule formation, if the conditions of plagioclase nuclea-tion and growth are understood. Because primary plagioclase typically contains a significant albite component, the presence of this mineral is sig...

Carbonation is the water-mediated replacement of silicate minerals, such as olivine, by carbonate, and is commonplace in the Earth's crust. This reaction can remove significant quantities of CO2 from the atmosphere and store it over geological timescales. Here we present the first direct evidence for CO2 sequestration and storage on Mars by mineral carbonation. Electron beam imaging and analysi...