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Journal of Petrology Advance Access originally published online on January 28, 2005
Journal of Petrology 2005 46(5):945-972; doi:10.1093/petrology/egi006
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

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

CLIFF S. J. SHAW1,*, JIMENA EYZAGUIRRE2, BRIAN FRYER3 and JOEL GAGNON4

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
4 DEPARTMENT OF EARTH SCIENCES AND THE GREAT LAKES INSTITUTE FOR ENVIRONMENTAL RESEARCH, UNIVERSITY OF WINDSOR, WINDSOR, ONTARIO, CANADA, N9B 3P4

RECEIVED JULY 7, 2003; ACCEPTED DECEMBER 3, 2004

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.

KEY WORDS: Eifel; mantle xenoliths; metasomatism; trace elements

* Corresponding author. E-mail: Cshaw{at}unb.ca


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