The insoluble organic matter in carbonaceous chondrites: Chemical structure,isotopic composition and origin |
| |
| Institution: | 1. Laboratoire de géologie des systèmes volcaniques, UMR CNRS 7154, institut de physique du globe/université Pierre-et-Marie-Curie, 4, place Jussieu, 75005 Paris, France;2. Laboratoire d’étude de la matière extraterrestre, UMS CNRS 2679 NanoAnalyses, Muséum national d’histoire naturelle, 61, rue Buffon, 75005 Paris, France;3. Laboratoire de chimie bioorganique et organique physique, UMR CNRS 7618, École nationale supérieure de chimie de Paris, 11, rue Pierre-et-Marie-Curie, 75005 Paris, France |
| |
| Abstract: | Carbonaceous chondrites are characterized by their enrichment in organic matter, mainly represented by insoluble organic matter (IOM), which consists of small aromatic units linked by short-branched aliphatic chains. Furthermore, IOM contains organic radicals heterogeneously distributed along with diradicaloids. These chemical features discriminate IOM from terrestrial counterparts. Isotopic compositions, especially the D/H isotopic ratio, are also distinct. IOM is highly enriched in D (D/H > 350 × 10?6), and the D/H isotopic ratio is heterogeneous. The isotopic composition is the result of interstellar-like processes that could have taken place during the first ages of the protosolar nebula. Chemical structure and isotopic composition clearly show that IOM is synthesized by an abiotic process and is subsequently affected by aqueous alteration or high-temperature metamorphism on the parent body. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
