# CAS mapped organic matter across nine meteorites using 10-micrometer mass spectrometry

- Published: 2026-11-07 03:46 UTC
- Section: Planet › Earth sciences
- Tags: soluble organic matter, chondrites aqueous alteration, DESI HRMS imaging, phyllosilicates meteorites, Chinese Academy of Sciences
- URL: https://realtech.media/news/rt-bf031c0497910c70b479818b_cas_mapped_organic/

**Researchers tracked soluble organics across nine meteorites in the lab, linking compound preservation directly to water-rock reactions.**

![CAS mapped organic matter across nine meteorites using 10-micrometer mass spectrometry](https://realtech.media/media/2026/11/b9d49a699b25e4e4.jpg)
*NASA/JPL-Caltech/MSSS/LANL/PhotonSys, Wikimedia Commons, Public domain*

Researchers from the Institute of Geology and Geophysics at the Chinese Academy of Sciences analyzed the composition and spatial distribution of soluble organic matter in nine meteorites [1]. The study, published in The Innovation Geoscience, applied desorption electrospray ionization high-resolution mass spectrometry (DESI-HRMS) imaging alongside ultra-high-performance liquid chromatography–high-resolution mass spectrometry (UHPLC-HRMS). The authors analyzed polished meteorite sections at approximately 10-micrometer spatial resolution and resolved about 3,000 organic components in methanol extracts [1].

## Mineral associations and spatial distribution

The analytical imaging revealed that soluble organic matter is not distributed uniformly throughout the samples [1]. Instead, organic compounds preferentially concentrate within phyllosilicates, which are clay-like minerals formed during aqueous alteration, as well as in the fine-grained rims surrounding chondrules [1]. In contrast, carbonate phases produced during the same alteration stages are depleted of soluble organic matter [1]. The authors reported that mineral structure, porosity, and surface chemistry control the selective adsorption and preservation of these organic molecules [1].

## Parent-body aqueous alteration and fluid conditions

Bulk chemical measurements indicated that the total abundance of soluble organics correlates positively with the degree of aqueous alteration in CM2 chondrites [1]. Specifically, the amounts of nitrogen-, oxygen-, and sulfur-bearing compounds increase alongside water-rock reactions [1]. However, highly altered CI1 chondrites deviate from this linear progression [1].

Systematic variations also emerged across different parent bodies [1]. For instance, the Tarda meteorite from a D-type asteroid contains noticeably less-polar organic compounds than carbonaceous chondrites originating from C-type asteroids [1]. According to the authors, the preservation and molecular features of soluble extraterrestrial organics are shaped simultaneously by three factors: original heliocentric distance in the Solar System, parent-body fluid redox conditions, and local microscale mineral phases [1].

## Sources

1. [The Innovation Geoscience](https://doi.org/10.59717/j.xinn-geo.2026.100199)
2. [EurekAlert](https://www.eurekalert.org/news-releases/1150915)

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Source: RealTech, realtech.media — https://realtech.media/news/rt-bf031c0497910c70b479818b_cas_mapped_organic/