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A Nitrogen-Rich Metamorphic Fluid and Coexisting Minerals in Slates from North Wales

Published online by Cambridge University Press:  05 July 2018

S. H. Bottrell ,
L. P. Carr  and
J. Dubessy
S. H. Bottrell
Affiliation:
Department of Earth Sciences, University of Leeds, Leeds LS2 9JT
L. P. Carr
Affiliation:
Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA
J. Dubessy
Affiliation:
Centre de Recherches sur la Geologie de l'Uranium, 3 rue du Bois de la Champelle, 54500 Vandœuvre-les-Nancy, France
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Abstract

Volatile species analysis of fluid inclusions in metamorphic quartz veins from the Llanbedr Formation, North Wales, show nitrogen to be an important component. Microthermometric and Laser Raman analysis indicates that the N2 is resident in a generation of very N2-rich inclusions and demonstrates the presence of both N2-rich and aqueous fluids during metamorphism of the Llanbedr Formation. N2-rich fluids do not appear to have been present in adjacent lithologies. Isotopic analysis of N2 in fluid inclusions and in the slates indicates that the N2 in the slates (thought to be present as substituting for K+ in muscovite and for Na+ in ) was probably originally derived from organic matter in the sediment and subsequently released to the fluid phase during metamorphism.

Mineral-fluid and fluid-phase equilibrium calculations show that the mineral assemblage in the slates could be in equilibrium with either N2-rich or aqueous fluid depending on redox conditions. The N2-rich and aqueous fluids in the veins could, therefore, have been trapped at different times under different conditions, though their coexistence as immiscible fluids is a possibility.

Keywords

nitrogen-rich metamorphic fluidcoexisting mineralsslateNorth Wales
Type
Petrology and Geochemistry
Information
Mineralogical Magazine , Volume 52 , Issue 367 , September 1988 , pp. 451 - 457
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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