The effects of thermal metamorphism on organic matter in the co3 carbonaceous chondrite meteorites

Authors: E. Bonato (Natural History Museum; University of Glasgow) , A. J. King (Natural History Museum) , P. F. Schofield (Natural History Museum) , B. Kaulich (Diamond Light Source) , T. Araki (Diamond Light Source) , M. K. Abyaneh (Diamond Light Source) , M. R. Lee (University of Glasgow) , S. S. Russell (Natural History Museum)
Co-authored by industrial partner: No

Type: Conference Paper
Conference: The Ninth Symposium on Polar Science
Peer Reviewed: No

State: Published (Approved)
Published: December 2018

Abstract: Primitive CO3 carbonaceous chondrite meteorites provide a detailed record of the geological processes and events that have shaped our solar system over the last 4.5 billion years. They contain a fine-grained (≤ 1 μm) matrix (> 50 vol%) of amorphous and crystalline silicates, oxides, sulphides and metals that have remained largely unaltered since the time they accreted into an asteroid. The matrix of CO3 carbonaceous chondrites also contains ~5 wt% carbon in a wide variety of organic materials including soluble molecules, kerogen-like insoluble organic matter (IOM), and carbonaceous nanoglobules. The formation and evolution of the organic materials and their relationship to the mineralogy remains poorly understood mainly because of the fine-grained and heterogeneous nature of the matrix. However, new analytical techniques are now making it possible to study the relationship between organics and minerals in extra-terrestrial materials in-situ at high spatial resolution. Here, we present C K-edge X-ray absorption near edge structure (XANES) analyses of carbonaceous phases in the CO chondrites DOM 08006, NWA 7892 and Moss.

Subject Areas: Earth Science

Instruments: I08-Scanning X-ray Microscopy beamline (SXM)