Chemical state of the nitrogen in rocks

Details Chemical state of the nitrogen in rocks Chemical state of the nitrogen in rocks

Jul 1962

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962gecoa..26..797s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 26, Issue 7, pp.797-809

Physics

6

Scientific paper

A considerable amount of the nitrogen in igneous and sedimentary rocks exists as ammonium ions held within the lattice structures of silicate minerals. In sedimentary rocks, the ammonium is held by secondary silicate minerals; in igneous rocks, the ammonium is contained largely within potassium-bearing primary minerals. Analyses indicated that most of the nitrogen in igneous rocks, and from one-tenth to two-thirds of that in sedimentary rocks (shales) occurred as fixed ammonium. The low C / N ratios reported previously for sedimentary rocks were found to be due to fixed ammonium, a conclusion that emphasizes the fact that the ratio should not be considered a characteristic of indigenous organic matter. Sedimentary rocks analysed in this study had C / N ratios which ranged from 9.4 to 37.2; the C / organic N ratios ranged from 34.8 to 43.4.

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