ArticleHigh ammonium contents in the 3800 Ma Isua supracrustal rocks, central West Greenland
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Cited by (32)
Evaluating the biosignature potential of nitrogen concentrations in graphite and associated K-silicates
2023, Chemical GeologyCitation Excerpt :In these graphitic metapelites from Isua, samples with >2 wt% K contain >20 μg/g of nitrogen, suggesting that a significant fraction of the total nitrogen content is hosted in potassic silicate minerals (Stüeken et al., 2021). This phenomenon is well known from other metasedimentary successions in the rock record where TN and K are strongly correlated (reviewed by Busigny and Bebout, 2013), and it is consistent with independent measurements of nitrogen in biotite separates, which contain several tens to hundreds of μg/g (Fig. 7a) (Honma, 1996; Pinti et al., 2001; Papineau et al., 2005). During diagenetic alteration of biomass within sediments, ammonium is released into pore waters, where it can reach concentrations of several millimole per litre (Rosenfeld, 1979; Boudreau and Canfield, 1988).
Reflectance spectroscopy of ammonium-bearing phyllosilicates
2019, IcarusCitation Excerpt :Phyllosilicates of magmatic or metamorphic origin, such as biotite and serpentine, do not show spectral variations due to the presence of ammonium. The presence in nature of micas with ammonium does not exclude that these can be enriched with ammonium under conditions of temperature and pressure higher than those used in this experiment (Vedder, 1965; Itihara and Honma, 1979; Honma, 1996; Busigny et al., 2003; Papineau et al., 2005). When comparing the spectra obtained on the studied ammoniated phyllosilicates to the VIR spectra, the presence of the 3.06 µm band is in good agreement with Ceres’ surface average spectrum, although the presence of water inside the clays tends to mask the NH4+ absorption bands in the 3 µm region.
The nitrogen budget of Earth
2015, Earth-Science ReviewsAmmonium loss and nitrogen isotopic fractionation in biotite as a function of metamorphic grade in metapelites from western Maine, USA
2010, Geochimica et Cosmochimica ActaThe behavior of nitrogen and nitrogen isotopes during metamorphism and mineralization: Evidence from the Otago and Alpine Schists, New Zealand
2005, Earth and Planetary Science LettersNitrogen isotopic composition of ammoniated phyllosilicates: Case studies from Precambrian metamorphosed sedimentary rocks
2005, Chemical GeologyCitation Excerpt :Additional detailed analyses are required to understand this characteristic of the Isua samples. It has been suggested that an igneous or metasedimentary protolith for metamorphosed rocks can be distinguished on the basis of ammonium concentration (especially in biotite; Itihara and Honma, 1979; Honma and Itihara, 1981; Itihara and Suwa, 1985; Duit et al., 1986; Tainosho and Itihara, 1988; Itihara and Tainosho, 1989; Honma, 1996). The elevated [NH4+]biotite values measured in our samples from West Greenland may therefore be viewed as yet another diagnostic for a sedimentary protolith of these rocks.