Contributions to Mineralogy and Petrology

, Volume 55, Issue 2, pp 139–145 | Cite as

Flowage differentiation: Limitation of the “Bagnold effect” to the narrow intrusions

  • Michel Barrière
Article
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Accepted:

Abstract

The “Bagnold effect”, the most important in the flowage differentiation, is practically inoperative in porphyritic rocks in the case of large dykes and pipes with a width or a diameter over 100 meters. For these large channels, the magmatic differentiation between the core and the walls is not related to the forced magmatic flow, but should be ascribed to other mechanisms: crystal settling, natural convection, synchronous injection of already differentiated materials.

Keywords

Convection Mineral Resource Settling Natural Convection Flowage Differentiation 
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Copyright information

© Springer-Verlag 1976

Authors and Affiliations

  • Michel Barrière
    • 1
  1. 1.Département de GéologieUniversité de Bretagne occidentaleBrest-CedexFrance

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