Lyell Collection
Journal of the Geological Society
Lyell Centre  |   Lyell Collection  |   Subscriptions   |   Geological Society  |   Email alerts  |   Online bookshop  |   Help

Keywords:
Author:
Advanced search>>
This Article
Right arrow Full Text (PDF)
Right arrow References
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow Request Permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by FOWLER, M. B.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Journal of the Geological Society; 1992; v. 149; issue.2; p. 209-220;
DOI: 10.1144/gsjgs.149.2.0209
© 1992 Geological Society of London

Article

Elemental and O-Sr-Nd isotope geochemistry of the Glen Dessarry syenite, NW Scotland

M. B. FOWLER

Department of Geology, Oxford Polytechnic, Headington, Oxford. OX3 OBP, UK

Elemental, radiogenic isotope (Sr, Nd) and stable isotope (O) data from samples of the 456 Ma Caledonian Glen Dessarry syenite are all compatible with a two-stage crystal-fractionation model for the evolution of the magmas, locally modified by contamination with a partial melt of the surrounding Moine metasediments. The early-crystallizing phases which controlled melasyenite-leucosyenite evolution were biotite, calcic clinopyroxene plus minor apatite and titanite, whilst in-situ crystal-liquid separation also involved alkali feldspar and amphibole with minor allanite, zirconolite and zircon. The diverse accessory mineral suite controlled significant variations in many of the ‘incompatible’ elements, including inordinate Zr/Hf fractionation. Crustal contamination led to severe disturbance in abundances and inter-element ratios of U, Th; Zr, Hf; Nb, Ta; heavy REEs, Sr and Ba.

The elemental characteristics of the magmas are typical of shoshonitic subduction-related suites, with high LILEs, relatively low HFSEs and pronounced negative Nb-Ta anomalies. Inferred isotopic characteristics of the parent magmas (87Sr/86Sr {approx} 0.7040, {Sigma}Nd = + 2.5 and {delta} l8O {approx} + 7%o) are probably derived from a multicomponent source region involving a substantial input from contemporary depleted mantle.





This article has been cited by other articles:


Home page
 Scottish Journal of GeologyHome page
I. Neill and W. E. Stephens
The Cluanie granodiorite, NW Highlands of Scotland: a late Caledonian pluton of trondhjemitic affinity
Scottish Journal of Geology, 2009; 45: 117 - 130.
[Abstract] [PDF]

Home page
 Journal of the Geological SocietyHome page
M. B. Fowler, M. B. FOWLER, P. J. HENNEY, D. P. F. DARBYSHIRE, and P. B. GREENWOOD
Petrogenesis of high Ba-Sr granites: the Rogart pluton, Sutherland
Journal of the Geological Society, 2001; 158: 521 - 534.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
R. J. Preston, B. R. Bell, and G. Rogers
The Loch Scridain Xenolithic Sill Complex, Isle of Mull, Scotland: Fractional Crystallization, Assimilation, Magma-Mixing and Crustal Anatexis in Subvolcanic Conduits
J. Petrology, 1998; 39: 519 - 550.
[Abstract] [Full Text] [PDF]

Home page
 Scottish Journal of GeologyHome page
A. J. Highton
A re-evaluation of 'metasedimentary xenoliths' in the West Highland Granitic Gneiss of Inverness-shire
Scottish Journal of Geology, 1994; 30: 39 - 49.
[Abstract] [PDF]