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Contributions to Mineralogy and Petrology

, Volume 155, Issue 1, pp 111–121 | Cite as

Low-pressure, water-assisted anatexis of basic dykes in a contact metamorphic aureole, Fuerteventura (Canary Islands): oxygen isotope evidence for a meteoric fluid origin

  • M. I. HollowayEmail author
  • F. Bussy
  • T. W. Vennemann
Original Paper

Abstract

Migmatites produced by low-pressure anatexis of basic dykes are found in a contact metamorphic aureole around a pyroxenite–gabbro intrusion (PX2), on Fuerteventura. Dykes outside and inside the aureole record interaction with meteoric water, with low or negative δ18O whole-rock values (+0.2 to −3.4‰), decreasing towards the contact. Recrystallised plagioclase, diopside, biotite and oxides, from within the aureole, show a similar evolution with lowest δ18O values (−2.8, −4.2, −4.4 and −7.6‰, respectively) in the migmatite zone, close to the intrusion. Relict clinopyroxene phenocrysts preserved in all dykes, retain typically magmatic δ18O values up to the anatectic zone, where the values are lower and more heterogeneous. Low δ18O values, decreasing towards the intrusion, can be ascribed to the advection of meteoric water during magma emplacement, with increasing fluid/rock ratios (higher dyke intensities towards the intrusion acting as fluid-pathways) and higher temperatures promoting increasing exchange during recrystallisation.

Keywords

Basic dykes Contact aureole Meteoric water Oxygen isotopes Partial melting 

Notes

Acknowledgments

We would like to thank Lukas Baumgartner for helpful discussions, and reviewers (Luigi Dalai and an anonymous reviewer) for their useful comments. Many thanks also to Jean-Claude Lavanchy (CAM, University of Lausanne) for the whole-rock XRF analyses, Sébastien Pilet and Alexey Ulianov for their help on the LA-ICP-MS, Benita Putlitz for her help with the CO2 laser-line in the stable isotope laboratory, and the Cabildo Insular de Fuerteventura for their permission to sample in the studied area. This research was supported by the Swiss National Science Foundation (project no. 200021-100493 and 200020-108033).

Supplementary material

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.Institute of Mineralogy and Geochemistry, AnthropoleUniversity of LausanneLausanneSwitzerland

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