Nitrogen isotopic evolution of carbonaceous matter during metamorphism: Methodology and preliminary results

Magali Ader 1 Pierre Cartigny 1 Jean-Paul Boudou 2 Jae-Ho Oh Eddy Petit Marc Javoy 1
1 IPGP - Institut de Physique du Globe de Paris
2 Bioemco - Biogéochimie et écologie des milieux continentaux
Abstract : Nitrogen content and isotopic composition of carbonaceous-rich metasediments were determined by on-line and sealed-tube combustion using ultra-high vacuum line and static mass spectrometer adapted to analyse nitrogen nanomoles. Accurate measurements showed that nitrogen amount released by on-line combustion technique was underestimated to various extents. As a result, the nitrogen isotopic composition was not correctly determined. In contrast, sealed-tube combustion appeared to yield the most reproducible and accurate measurements, except for nitrogen depleted carbonaceous matter (semi-graphite to graphite transition) containing less than around 60 ppm of nitrogen, which were contaminated during their extraction from the rock. In view of that, a preliminary sealed-tube investigation of the organic nitrogen content and isotopic composition in a homogenous series of low-grade metasediments was undertaken: in spite of an important nitrogen loss, the carbonaceous matter nitrogen isotopic composition remains about the same during the meta-anthracite and semi-graphitisation stages. Inferences on the process of organic nitrogen mineralization during carbonaceous matter metamorphism can be drawn and several paleo-biogeochemical implications envisaged.
Keywords : Graphite Carbonaceous matter Kerogen Nitrogen isotopes Metamorphism
Document type :
Journal articles
Complete list of metadatas

Cited literature [116 references]  Display  Hide  Download
https://hal-bioemco.ccsd.cnrs.fr/bioemco-00138268
Contributor : Jean-Paul Boudou <>
Submitted on : Friday, June 22, 2007 - 7:12:27 PM
Last modification on : Sunday, October 20, 2019 - 1:24:41 AM
Long-term archiving on: Wednesday, April 7, 2010 - 12:33:11 AM

File

ADER-HAL.pdf
Files produced by the author(s)

Identifiers

Collections

CNRS | ENS-PARIS | IPGP | INRA | BIOEMCO | INSU | AGROPARISTECH | UPMC | PSL | USPC | SORBONNE-UNIVERSITE | UNIV-PARIS7

Citation

Magali Ader, Pierre Cartigny, Jean-Paul Boudou, Jae-Ho Oh, Eddy Petit, et al.. Nitrogen isotopic evolution of carbonaceous matter during metamorphism: Methodology and preliminary results. Chemical Geology, Elsevier, 2006, 323, pp.152-169. ⟨10.1016/j.chemgeo.2006.02.019⟩. ⟨bioemco-00138268⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

664

Files downloads

937

Contact

Informations

CCSD