Graphite as Geornarker and Fluid Index in East Gondwana Terrains

Sreeraj, K.; Wada, Hideki; Santosh, M.

doi:10.1016/s1342-937x(05)70766-8

Cited by 2 publications

(2 citation statements)

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“…Once identified, by combining nitrogen content and δ 15 N with more conventional characterization parameters (crystallinity, mineralogy, δ13 C, etc. ), biogenic/metamorphic graphite could be used as a geomarker for tracing Precambrian organic-rich sedimentary basins (Sreeraj et al, 2000;Dissanayake et al, 2000).…”

Section: Implications For the Use Of Metasedimentary Carbonaceous Matmentioning

confidence: 99%

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

Ader¹,

Cartigny²,

Boudou³

et al. 2006

Chemical Geology

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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

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Section: Implications For the Use Of Metasedimentary Carbonaceous Matmentioning

confidence: 99%

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

Ader¹,

Cartigny²,

Boudou³

et al. 2006

Chemical Geology

View full text Add to dashboard Cite

show abstract

“…There is not a clear and official definition of the term, and it has been ambiguously used to refer to different topics, not always following a formal concept. The specific works in which the term geomarker are particularly quoted deal with: i) the use of benzohopanes as geomarkers of sediments and petroleums (14); ii) the characterization of oil shales, using the alkane geomarkers as indicators of the immature character of sediments and the nature and environmental features of the source (15); iii) the utilization of spectroscopic techniques (Raman spectroscopy) for planetary exploration in the near future to search for extinct or extant life signals (16); iv) the use of some minerals (graphite) to carry out paleogeographic reconstractions (17,18); and v) the use of mineralogical textures, crystal-chemical features and isotopic values as geomarkers in methanogenic and hydrothermal chimneys (19,20). When regarding the specific relationship with life, it is important to note that the term ''geosignature'' has been proposed (21,22).…”

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confidence: 99%