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Letter. Magnetite-free, yellow lizardite serpentinization of olivine websterite, Canyon Mountain complex, N.E. Oregon
-
Bernard W. Evans
,
Scott M. Kuehner
Published/Copyright:
April 1, 2015
Abstract
We document an example of serpentinization of olivine and orthopyroxene that produced virtually no magnetite, but instead relatively Fe-rich yellow-colored lizardite (XFe = 0.08 to 0.17), and the native Fe-Ni-Co metals, awaruite and wairauite. Lizardite’s identity was confirmed by micro-Raman spectroscopy, although peaks are broad. Electron microprobe analyses of the lizardite yield a continuous compositional trend of formula contents suggestive of the progressive uptake of Fe3+ exclusively on M sites, where it is charge balanced by vacancies. Although these observations are unusual, this secondary mineral assemblage can be explained in terms of the likely intensive variables T, fH₂O, fH₂, and aSiO₂ attending the alteration. The absence of magnetite in serpentinization does not signify a lack of oxidation. By forming the hydrated phase-component ferri-lizardite instead of magnetite from the fayalite and ferrosilite components, the yield of hydrogen is reduced by two-thirds. The usual inverse correlation of rock density with magnetic susceptibility is unlikely to be the case in this kind of serpentinization
Keywords: Serpentinite; ferrian lizardite; olivine-websterite; micro-Raman; hydrogen; magnetic susceptibility
Received: 2009-5-26
Accepted: 2009-7-8
Published Online: 2015-4-1
Published in Print: 2009-11-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Serpentinite;
ferrian lizardite;
olivine-websterite;
micro-Raman;
hydrogen;
magnetic susceptibility
Articles in the same Issue
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- Chemical substitutions, paragenetic relations, and physical conditions of formation of högbomite in the Sittampundi layered anorthosite complex, South India
- Miguelromeroite, the Mn analogue of sainfeldite, and redefinition of villyaellenite as an ordered intermediate in the sainfeldite-miguelromeroite series
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- Effect of SiO2, total FeO, Fe3+/Fe2+, and alkali elements in basaltic glasses on mid-infrared
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