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Letter. Native aluminum: Does it exist?
-
Vesselin M. Dekov
,
Vasil Arnaudov
Veröffentlicht/Copyright:
1. April 2015
Abstract
Several papers reporting exotic native elements have been published within the last few decades. The “native” occurrences described are rather dubious in view of the lack of solid proof of their relationships with the host-rock minerals. Consequently, the genetic models proposed ranging from bio-reduction to the influence of deep-mantle, strongly reduced fluids, are somewhat speculative. Here we present data for a unique Al0 flake protruding from the phlogopite matrix of a rock specimen collected from a desilicated pegmatite vein. The geologic setting suggests two processes that might have played a key role in the Al0 formation: (1) desilication of pegmatite, resulting in its Al residual enrichment; and (2) serpentinization of an ultramafic body, providing a strongly reduced front (H2 and hydrocarbons) toward the serpentinite/pegmatite contact. These processes have presumably led to the reduction of Al to Al0 at discrete sites of alumina-rich minerals.
Received: 2009-3-9
Accepted: 2009-5-2
Published Online: 2015-4-1
Published in Print: 2009-8-1
© 2015 by Walter de Gruyter Berlin/Boston
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- Spatially heterogeneous burial and high-P/T metamorphism in the Crescent Formation, Olympic Peninsula, Washington
- Quantitative microstructural characterization of natrojarosite scale formed during high-pressure acid leaching of lateritic nickel ore
- Magnetic and microscopic characterization of magnetite nanoparticles adhered to clay surfaces
- Single crystal growth of wadsleyite
- Elastic behavior and phase stability of pollucite, a potential host for nuclear waste
- Crystal structure determination of anandite-2M mica
- Excess heat capacity and entropy of mixing in high structural state plagioclase
- Cannibalization of an amphibole-rich andesitic progenitor induced by caldera-collapse during the Matahina eruption: Evidence from amphibole compositions
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