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Title

Nitrogen determination in micas of metamorphic rocks

AuthorsAger, F. J. CSIC ORCID; Ynsa, M. D.; Respaldiza, M. A. CSIC ORCID
KeywordsMica
Nitrogen
Ammonium
Nuclear microprobe
DIGE
Issue DateAug-2006
PublisherElsevier
CitationNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 249(1-2): 642-645 (2006)
AbstractMicas are minerals that provide large amounts of information regarding geological processes, because of the sensitivity of their chemical composition to temperature, pressure and deformation of rocks in which they form. Rocks under analysis are formed of different minerals with variable grain size. Mica grain size may vary between 5 and 10 μm and approximately correspond to the chemical formula (Si3.2Al0.8)O10(Al1.9Fe0.05Mg0.1)(OH)2(K0.75Na0.05), being distinguishable from other minerals because of their composition and their morphology in secondary electron images and specially backscattered electron (BSE) images. NH4, when present, would partially substitute K in the previous formula. In some cases NH4-rich micas (tobelites) have been described coexisting with the corresponding K-rich micas, but the actual NH4 content of normal K-rich micas is still unknown. Low N content makes necessary to use nuclear reactions such as 14N(d, pγ)15N at 1.4 MeV and its cascade of intense γ-rays. For the quantification and localization of nitrogen on the surface of the samples, PIGE analysis was carried out in the vacuum microprobe line of the CNA, together with simultaneous micro-RBS and micro-PIXE analyses, giving a more comprehensive picture of sample structure and composition.
Description6 pages, 1 table, 1 figure.-- Proceedings of the Seventeenth International Conference on Ion Beam Analysis.-- El pdf del artículo es la versión post-print.-- et al.
Publisher version (URL)http://dx.doi.org/10.1016/j.nimb.2006.03.072
URIhttp://hdl.handle.net/10261/18663
DOI10.1016/j.nimb.2006.03.072
ISSN1359-6462
Appears in Collections:(CNA) Artículos




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