Extraterrestrial materials, including meteorites, interplanetary dust, and spacecraft-returned
asteroidal and cometary samples, provide a record of the starting materials and early …

Organic matter in carbonaceous chondrites is distributed in fine-grained matrix. To
understand pre-and postaccretion history of organic matter and its association with …

We performed an in-depth exploration of the Al–Mg system for presolar graphite, SiC, and Si
3 N 4 grains found to contain large excesses of 26 Mg, indicative of the initial presence of …

Deciphering the origin, age, and composition of deep marine organic carbon remains a
challenge in understanding the dynamics of the marine carbon cycle. In particular, the …

There are growing demands for integrated study of isotopes, trace elements and
crystallography of micron-sized grains observed on polished sections or scattered on …

The D/H ratio imaging of weakly hydrated minerals prepared as focused ion beam (FIB)
sections is developed in order to combine isotopic imaging by nanoscale secondary ion …

We report correlated XANES, TEM, and NanoSIMS measurements of twelve presolar
graphite grains extracted from primitive meteorites and for which isotopic data indicate …

We analyzed seven presolar SiC grains of supernova origin (average diameter: 1–2 μm)
with transmission electron microscopy. Five grains are polycrystalline, whereas two grains …