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Journal of Petrology | Volume 43 | Number 12 | Pages 2219-2259 | 2002
© Oxford University Press 2002

Mechanisms and Sources of Mantle Metasomatism: Major and Trace Element Compositions of Peridotite Xenoliths from Spitsbergen in the Context of Numerical Modelling

DMITRI A. IONOV1,2,*, JEAN-LOUIS BODINIER3, SAMUEL B. MUKASA4 and ALBERTO ZANETTI5

1DEPARTMENT OF EARTH AND ENVIRONMENTAL SCIENCES, UNIVERSITÉ LIBRE DE BRUXELLES, CP160/02, B-1050 BRUSSELS, BELGIUM
2DEPARTMENT OF GEOLOGY, NIIGATA UNIVERSITY, 2-8050 IKARASHI-NINOCHYO, NIIGATA, 950-2181, JAPAN
3LABORATOIRE DE TECTONOPHYSIQUE (UMR 5568 CNRS), ISTEEM, UNIVERSITÉ MONTPELLIER 2, CASE 049, 34095 MONTPELLIER CEDEX 05, FRANCE
4DEPARTMENT OF GEOLOGICAL SCIENCES, UNIVERSITY OF MICHIGAN, ANN ARBOR, MI 48109-1063, USA
5CNR–ISTITUTO DI GEOSCIENCE & GEORISORSE (IGG), SEEIONE DI PAVIA, 27100 PAVIA, ITALY

Mineral and whole-rock chemical data for peridotite xenoliths in basaltic lavas on Spitsbergen are examined to reassess mechanisms of melt–fluid interaction with peridotites and their relative role versus melt composition in mantle metasomatism. The enrichment patterns in the xenoliths on primitive mantle-normalized diagrams range from Th–La–Ce ‘inflections’ in weakly metasomatized samples (normally without amphibole) to a continuous increase in abundances from Ho to Ce typical for amphibole-bearing xenoliths. Numerical modelling of interaction between depleted peridotites and enriched melts indicates that these patterns do not result from simple mixing of the two end-members but can be explained by chromatographic fractionation during reactive porous melt flow, which produces a variety of enrichment patterns in a single event. Many metasomatized xenoliths have negative high field strength element and Pb anomalies and Sr spikes relative to rare earth elements of similar compatibility, and highly fractionated Nb/Ta and Zr/Hf. Although amphibole precipitation can produce Nb–Ta anomalies, some of these features cannot be attributed to percolation-related fractionation alone and have to be a signature of the initial melt (possibly carbonate rich). In general, chemical and mineralogical fingerprints of a metasomatic medium are strongest near its source (e.g. a vein) whereas element patterns farther in the metasomatic ‘column’ are increasingly controlled by fractionation mechanisms.

KEY WORDS: Spitsbergen; lithospheric mantle; metasomatism; trace elements; theoretical modelling


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