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Rouchon, V ; Pinti, DL ; Gallien, JP ; Orberger, B ; Daudin, L ; Westall, F

NRA analyses of N and C in hydromuscovite aggregates from a 3.5 Ga chert from Kittys Gap, Pilbara, Australia

Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions With Materials and Atoms 231 536-540

par Administrateur - publié le

Abstract :

Piophile elements nitrogen and carbon were found in hydromuscovite aggregates of an Archean chert from Kittys Gap, W. Australia, hosting probable evidence of life. Their concentrations do not show a linear relationship, as expected,if they where produced by a common organic source. The lack of a linear relationship is related to N and C fractionation at the mineral scale. N occurs in the form of NH4+, tightly retained at the K+ lattice sites, while C could occurs as a dispersed organic phase in hydromuscovite aggregates or in a weakly bounded form.. possibly HCO3-. (c) 2005 Elsevier B.V. All rights reserved.