Nitrogen and carbon partitioning in diagenetic and hydrothermal minerals from Paleozoic Black Shales, (Selwyn Basin, Yukon Territories, Canada)

Orberger, B.; Gallien, Jean-Paul; Pinti, Daniele L.; Fialin, Michel; Daudin, L.; Gröcke, Darren R.; Pašava, Jan

doi:10.1016/j.chemgeo.2005.01.012

Cited by 29 publications

(21 citation statements)

References 59 publications

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“…It is also noted that the positive correlation between Ni and Se in Ni-Fe-sulfides and the increasing Ni and Se concentrations from Fe-sulfides to Fe-Ni-sulfides, NiFe-sulfides and Ni-sulfides indicate the influence of Niand Se-bearing hydrothermal fluid on those sulfides. This genetic model of the Ni-Mo-Se sulfide layer is also supported by several researchers who suggested that fractions of Se could be derived from submarine hydrothermal fluids (Steiner et al, 2001;Orberger et al, 2005Orberger et al, , 2007Jiang et al, 2007;Pasava et al, 2008). Selenium contents in hydrothermal sulfide minerals are highly variable, but are universally higher.…”

Section: Distribution Of Se Speciation and Chemical Statementioning

confidence: 70%

Selenium speciation in Lower Cambrian Se-enriched strata in South China and its geological implications

Fan

Wen

et al. 2011

Geochimica et Cosmochimica Acta

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Section: Distribution Of Se Speciation and Chemical Statementioning

confidence: 70%

Selenium speciation in Lower Cambrian Se-enriched strata in South China and its geological implications

Fan

Wen

et al. 2011

Geochimica et Cosmochimica Acta

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“…In situ techniques such as electron microprobe (Beran et al, 1992), ion microprobe (Hashizume et al, 2000) or nuclear reaction analyses (Gallien et al, 2004;Orberger et al, 2005) so far cannot resolve concentrations below few hundreds of ppm. Consequently, in the present work, N speciation is assessed indirectly.…”

Section: Nitrogen Speciation In Alpine Metagabbrosmentioning

confidence: 99%

Nitrogen isotopes in ophiolitic metagabbros: A re-evaluation of modern nitrogen fluxes in subduction zones and implication for the early Earth atmosphere

Busigny

Cartigny

Philippot

2011

Geochimica et Cosmochimica Acta

121

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“…and, more recently, Nishizawa et al [2005] have shown that magnetite from banded iron formations (BIFs) contain significant amounts of N in unknown form [Shen et al, 2006;Cloquet et al, 2006]. Recent data by Orberger et al [2005Orberger et al [ , 2006c indicate that biogenic apatite and sulfides host significant amounts of organic C and N in Paleozoic black shales.…”

Section: Introductionmentioning

confidence: 99%

“…[7] The objective of this study is to investigate in detail the sources and fate of nitrogen and carbon in a Precambrian chert using quantitative micrometric and nanometric scale in situ analyses of N and C by nuclear reaction analysis (NRA hereafter) Rouchon et al, 2005;Orberger et al, 2005] combined with steppedcombustion extraction and isotopic analysis of N by mass spectrometry [Yamamoto et al, 1998;. We focus on the search of geochemical and isotopic ''fingerprints,'' providing signs of ancient life.…”

Section: Introductionmentioning

confidence: 99%

Biogenic nitrogen and carbon in Fe‐Mn‐oxyhydroxides from an Archean chert, Marble Bar, Western Australia

Pinti

Hashizume

Orberger

et al. 2007

Geochem Geophys Geosyst

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[1] To quantify and localize nitrogen (N) and carbon (C) in Archean rocks from the Marble Bar formation, Western Australia, and to gain insights on their origin and potential biogenicity, we conducted nuclear reaction analyses (NRA) and carbon and nitrogen isotope ratio measurements on various samples from the 3460-Myr-old Fe-rich Marble Bar chert. The Marble Bar chert formed during the alteration of basaltic volcanoclastic rocks with Fe-and Si-rich hydrothermal fluids, and the subsequent precipitation of magnetite, carbonates, massive silica, and, locally, sulfides. At a later stage, the magnetite, sulfides, and carbonates were replaced by Fe-Mn-oxyhydroxides. Nuclear reaction analyses indicate that most of the N and C resides within these Fe-Mn-oxyhydroxides, but a minor fraction is found in K-feldspars and Ba-mica dispersed in the silica matrix. The N and C isotopic composition of Fe-oxides suggests the presence of a unique biogenic source with d 15 N AIR values from +6.0 ± 0.5% to 7.3 ± 1.1% and a d 13 C PDB value of À19.9 ± 0.1%. The C and N isotope ratios are similar to those observed in Proterozoic and Phanerozoic organic matter. Diffusion-controlled fractionation of N and C released during high combustion temperatures indicates that these two elements are firmly embedded within the iron oxides, with activation energies of 18.7 ± 3.7 kJ/mol for N and 13.0 ± 3.8 kJ/mol for C. We propose that N and C were chemisorbed on iron and were subsequently embedded in the crystals during iron oxidation and crystal growth. The Fe-isotopic composition of the Marble Bar chert (d 56 Fe = À0.38 ± 0.02%) is similar to that measured in iron oxides formed by direct precipitation of iron from hydrothermal plumes in contact G 3

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Nitrogen and carbon partitioning in diagenetic and hydrothermal minerals from Paleozoic Black Shales, (Selwyn Basin, Yukon Territories, Canada)

Cited by 29 publications

References 59 publications

Selenium speciation in Lower Cambrian Se-enriched strata in South China and its geological implications

Selenium speciation in Lower Cambrian Se-enriched strata in South China and its geological implications

Nitrogen isotopes in ophiolitic metagabbros: A re-evaluation of modern nitrogen fluxes in subduction zones and implication for the early Earth atmosphere

Biogenic nitrogen and carbon in Fe‐Mn‐oxyhydroxides from an Archean chert, Marble Bar, Western Australia

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