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AMS in Granites and Lava Flows: Two End Members of a Continuum?

  • Edgardo Cañón-Tapia
Chapter
Part of the IAGA Special Sopron Book Series book series (IAGA, volume 1)

Abstract

Significant differences between granites and lava flows can require different basic assumptions when interpreting AMS results. Among the differences between both types of rocks, perhaps the earliest in being recognized was the wider range of mineral compositions found in granites. Such difference can result in complex mineral assemblages that, in turn, can complicate the interpretation of AMS results in granites relative to the AMS measured in lava flows. Closely linked to this mineralogic effect is the distinction between “primary” flow fabrics and “secondary” effects. Such distinction is a matter of concern in most granites whereas the AMS of lava flows is usually considered “primary” without further examination. As the increasing evidence obtained from lava flows shows, however, the AMS of lavas is not as simple as the general model of hydrodynamic alignment of particles would suggest and much can be learned from lava flows that can be applied directly to the interpretation of AMS in granites. In this work, the better understanding of the fabric of lava flows that has been obtained in recent years is used as the basis for a reassessment of the basic assumptions needed for the correct interpretation of AMS in both lava flows and granitic rocks.

Keywords

Rock Type Lava Flow Igneous Rock Magnetic Anisotropy Mineral Fabric 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The comments made by two anonymous reviewers helped to clarify many of the ideas presented in the text are greatly appreciated. I also express my thanks to E. Herrero-Bervera for the encouragement that led me to give a more formal expression to some of the ideas presented here and that had been informally discussed several times.

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© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Departamento de GeologíaCICESEEnsenadaMexico
  2. 2.Geology DepartmentCICESESan DiegoUSA

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