Flowage differentiation: Limitation of the “Bagnold effect” to the narrow intrusions |
| |
Authors: | Michel Barrière |
| |
Institution: | (1) Département de Géologie, Université de Bretagne occidentale, F-29283 Brest-Cedex, France |
| |
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: | |
本文献已被 SpringerLink 等数据库收录! |
|