A novel organic-rich meteoritic clast from the outer solar system.

ABSTRACT: The Zag meteorite which is a thermally-metamorphosed H ordinary chondrite contains a primitive xenolithic clast that was accreted to the parent asteroid after metamorphism. The cm-sized clast contains abundant large organic grains or aggregates up to 20 μm in phyllosilicate-rich matrix. Here we report organic and isotope analyses of a large (~10 μm) OM aggregate in the Zag clast. The X-ray micro-spectroscopic technique revealed that the OM aggregate has sp² dominated hydrocarbon networks with a lower abundance of heteroatoms than in IOM from primitive (CI,CM,CR) carbonaceous chondrites, and thus it is distinguished from most of the OM in carbonaceous meteorites. The OM aggregate has high D/H and ¹⁵N/¹⁴N ratios (δD = 2,370 ± 74‰ and δ¹⁵N = 696 ± 1

SUBMITTER: Kebukawa Y 

PROVIDER: S-EPMC6395772 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature