Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2019 Feb 28;9:3169. doi: 10.1038/s41598-019-39357-1

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

PMC Copyright notice

Scanning transmission X-ray microscopy (STXM) analyses of a focused ion beam (FIB) section containing the organic matter (OM) aggregate in the Zag clast. (a) Backscattered electron (BSE) image of a polished thin section of the organic aggregate (dark) in the carbonaceous clast in the Zag meteorite. FIB section was subsampled from the yellow region. (b) BSE image of the FIB section. STXM maps (c,d) were obtained from the location indicated by the red dotted line. (c) Carbon-map (at 292 eV) indicates the section is dominated by carbon. The OM aggregate is indicated by the yellow dotted line. (d) Spectral component map derived from C-XANES of OM (red) and matrix (green). The red and green regions correspond to the OM and matrix C-XANES spectra shown in (e). (e) The C-XANES of OM aggregate revealed that it is dominated by sp² carbon (284.8 eV) while in the surrounding matrix carbon is mainly found as carbonates (290.3 eV) with some OM at 286.3 eV that is assigned to ketone (C=O) and 288.5 eV that is assigned to carboxyl/ester [(C=O)O]. (f) The OM aggregate does not show detectable N-XANES features while matrix shows a peak at 401.0 eV which is assigned to amines. The C- and N-XANES obtained from isotope hot spots (HS, see Fig. 3) are also shown.