Abstract

Poster Presentations

Day 2, May 16（Tue.）　　Room P (Foyer, Room 1004-1007)

2P-36　　PDF

High Spatial Resolution DESI Imaging of Methanol-Soluble Organic Matter from Carbonaceous Chondrites

(¹Okayama Univ., ²Nihon Waters)
Christian Potizil¹, Ryoji Tanaka¹, ^oThanai Paxton²

Carbonaceous chondrites represent the largest inventory of primitive solar system material available for study. These hold clues to the formation and evolution of organic material, prior to initiation of the Solar System and throughout its history. For example, insoluble organic matter (IOM) and soluble organic matter (SOM) (e.g. amino acids and nitrogen heterocycles) have been suggested to form in the interstellar medium, protosolar nebular or on the icy planetesimal progenitor of a given asteroid. Understanding the relationships between organic matter and mineral phases offers a way to decipher the complex formation and alteration history affecting meteoritic organic matter. Despite several past studies on IOM-mineral relationships, SOM-mineral associations have been less well investigated partly due to the lack of high spatial resolution techniques for the characterisation of SOM distributions in carbonaceous chondrites. Desorption electrospray ionization-mass spectrometry (DESI-MS) has been used with success, but has been limited by a lack of spatial resolution. Recently, a novel sprayer design was developed and showed a tunable dimension down to 12 µm. This has been coupled with high resolution quadrupole time-of-flight (Q-ToF) mass spectrometry and applied to the carbonaceous chondrites Orgueil, Murchison and Aguas Zarcas, to decipher their mineral-organic relationships and understand the processes responsible.