Title :

Molecular Characterization of Gloecapsomorpha Prisca Microfossils by Mass Spectrometry Down to the Cellular Scale

Author(s) :

Bon, Mathilde [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Universiteit Gent = Ghent University = Université de Gand [UGENT]
Lepot, Kévin [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Institut universitaire de France [IUF]
Carpentier, Yvain [Auteur]
Physique Moléculaire aux Interfaces [PMI]
Bray, Fabrice [Auteur]
Miniaturisation pour la Synthèse, l’Analyse et la Protéomique - UAR 3290 [MSAP]
Riboulleau, Armelle [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Baudin, François [Auteur]
Institut des Sciences de la Terre de Paris [iSTeP]
Nuns, Nicolas [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Rolando, Christian [Auteur]
Miniaturisation pour la Synthèse, l’Analyse et la Protéomique - UAR 3290 [MSAP]
Steemans, Philippe [Auteur]
Paléobotanique, Paléopalynologie, Micropaléontologie (Liège, Belgium)
Vandenbroucke, Thijs R. A. [Auteur]
Universiteit Gent = Ghent University = Université de Gand [UGENT]

Conference title :

31st International Meeting on Organic Geochemistry (IMOG 2023)

City :

Montpellier

Country :

France

Start date of the conference :

2023-09-10

Publisher :

European Association of Geoscientists & Engineers

English keyword(s) :

mass spectrometry
micropaleontology
geobiochemistry
acritarchs
kukersite

HAL domain(s) :

Chimie

English abstract : [en]

Gloeocapsomorpha prisca (Fig. 1) is a microfossil (∼10µm) with an organic wall of uncertain biological affinity, probably a cyanobacterium1,2,4,6. This fossil microorganism constitutes the vast majority of the organic ...
Show more >Gloeocapsomorpha prisca (Fig. 1) is a microfossil (∼10µm) with an organic wall of uncertain biological affinity, probably a cyanobacterium1,2,4,6. This fossil microorganism constitutes the vast majority of the organic matter in “kukersite” rocks. G. prisca has been thoroughly studied by gas chromatography-mass spectrometry (GC-MS), using extractive techniques, chemolysis and pyrolysis1,2,3. Here we perform a pilot study in order to investigate the potential of laser-assisted mass spectrometry to analyze the molecular fingerprint of single microfossils. Bitumen and kerogen of a kukersite sample from a 460-million-year-old deposit of northwestern Russia5, were analyzed after organic solvent extractions and demineralization. We measure bulk thermo-desorption and pyrolysis parameters with Rock-Eval 7S. We use molecular characterization methods that allow analyses down to the scale of a single microfossil. We analyze kerogen by secondary ion time-of-flight mass spectrometry (ToF-SIMS), which combines extreme surface sensitivity with a spatial resolution of ∼1 µm. The kerogen is then analyzed with high resolution (HR-µL2-MS) two-step laser desorption-ionization mass spectrometry with a spatial resolution of 140 µm. We used very-high mass resolution Fourier transform ion cyclotron resonance mass spectrometry by laser desorption/ionization (LDI-FT-ICR-MS) on G. prisca aggregates (e.g., Fig. 1) with laser beams down to less than 20 µm.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL