A nitrogen-rich metamorphic fluid and coexisting minerals in slates from North Wales

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Authors:Bottrell, S. H.; Carr, L. P.; Debessy, J.
Author Affiliations:Primary:
Univ. Leeds, Dep. Earth Sci., Leeds, United Kingdom
Other:
Open Univ., United Kingdom
Cent. Rech. Geol. Uranium, France
Volume Title:Mineralogical Magazine
Source:Mineralogical Magazine, 52 Part 4(367), p.451-457. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0026-461X
Publication Date:1988
Note:In English. 30 refs.; illus. incl. 3 tables, geol. sketch map
Summary:Volatile species analysis of fluid inclusions in metamorphic quartz veins from the Llanbedr formation in the Harlech Dome show N2 to be an important component. Isotopic analysis of N2 in fluid inclusions and in the slates indicates that the N2 in the slates (thought to be present as NH+4 substituting for K+ in muscovite and for Na+ in albite) was probably originally derived from organic matter in the sediment and subsequently released to the fluid phase during metamorphism. [R.A.H.]
Subjects:Fluid inclusions; Framework silicates; Fugacity; Gases; Geologic thermometry; Inclusions; Interpretation; Metamorphic rocks; Metamorphism; Mineral assemblages; Nitrogen; P-T conditions; Petrology; Phase equilibria; Quartz; Silica minerals; Silicates; Slates; Veins; Europe; Great Britain; Harlech Dome; United Kingdom; Wales; Western Europe; Llanbedr Formation; Northern Wales
Abstract Numbers:89M/0666
Record ID:1989002743
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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