Skip Navigation



Journal of Petrology Advance Access published online on January 28, 2005
Journal of Petrology, doi:10.1093/petrology/egi006
This Article
Right arrow FREE Full Text (PDF) Freely available
Right arrow All Versions of this Article:
46/5/945    most recent
egi006v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
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 Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by SHAW, C. S. J.
Right arrow Articles by GAGNON, J.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Journal of Petrology © Oxford University Press 2005; all rights reserved
Received July 7, 2003
Accepted December 3, 2004

Article

Regional Variations in the Mineralogy of Metasomatic Assemblages in Mantle Xenoliths from the West Eifel Volcanic Field, Germany

CLIFF S. J. SHAW 1*, JIMENA EYZAGUIRRE 2, BRIAN FRYER 3, and JOEL GAGNON 3

1 DEPARTMENT OF GEOLOGY, UNIVERSITY OF NEW BRUNSWICK, 2 BAILEY DRIVE, FREDERICTON, NEW BRUNSWICK, CANADA, E3B 5A3
2 DEPARTMENT OF EARTH SCIENCES, UNIVERSITY OF WESTERN ONTARIO, LONDON, ONTARIO, CANADA, N6A 5B7
3 DEPARTMENT OF EARTH SCIENCES AND THE GREAT LAKES INSTITUTE FOR ENVIRONMENTAL RESEARCH, UNIVERSITY OF WINDSOR, WINDSOR, ONTARIO, CANADA, N9B 3P4

* To whom correspondence should be addressed.
CLIFF S. J. SHAW, E-mail: Cshaw{at}unb.ca


  Abstract

Xenoliths record two distinct events in the mantle below the Quarternary West Eifel Volcanic Field, Germany. The first, during the Hercynian Orogeny, led to widespread formation of secondary, Ti-poor amphibole, clinopyroxene and phlogopite. The signature of the second event, related to Quaternary volcanism, varies across the field. At Dreiser Weiher and Meerfelder Maar, this event is characterized by amphibole-phlogopite-clinopyroxene veins, hosted in lherzolite and harzburgite xenoliths brought to the surface by sodic olivine nephelinite-basanite suite lavas. These veins formed from crystallization of sodic magma that flowed along fractures in the mantle. At Rockeskyller Kopf, Gees and Baarley, the Quaternary event is characterized by wehrlite xenoliths, many of which have phlogopite-clinopyroxene veins, that were transported by potassic foid suite lavas. Wehrlite formed by reaction of lherzolite-harzburgite, with a large volume of potassic magma that flowed along grain boundaries rather than in fractures. During reaction, orthopyroxene was consumed and secondary clinopyroxene, olivine and phlogopite precipitated. Veins formed in wehrlites only during periodic over-pressure events. The composition of the magmas parental to the veins is similar to the lavas that carried the xenoliths to surface, indicating that the source of foid and olivine nephelinite-basanite suite magma is domainal, as was the flow regime and magma flux.

Keywords: Eifel; mantle xenoliths; metasomatism; trace elements.
Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 J PetrologyHome page
Z. Zajacz, I. Kovacs, C. Szabo, W. Halter, and T. Pettke
Evolution of Mafic Alkaline Melts Crystallized in the Uppermost Lithospheric Mantle: a Melt Inclusion Study of Olivine-Clinopyroxenite Xenoliths, Northern Hungary
J. Petrology, May 1, 2007; 48(5): 853 - 883.
[Abstract] [Full Text] [PDF]


Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.