Dike intrusion under shear stress: Effects on magnetic and vesicle fabrics in dikes from rift zones of Tenerife (Canary Islands) |
| |
| Authors: | Carles Soriano Clemente Elisabet Beamud Amors Miguel Garcs Crespo |
| |
| Institution: | aInstitut de Ciències de la Terra Jaume Almera CSIC, c/Lluís Solé Sabarís s/n, 08028 Barcelona, Spain;bLaboratori de Paleomagnetisme UB-CSIC, c/Lluís Solé Sabarís s/n, 08028 Barcelona, Spain;cFacultat de Geologia, Universitat de Barcelona, c/Martí i Franquès s/n, 08028 Barcelona, Spain |
| |
| Abstract: | A theoretical model predicting how anisotropy of magnetic susceptibility (AMS) and vesicle fabrics are modified by shear stress resolved on the dike walls prior to the final cooling of magma is developed for vertical dikes. The resulting fabrics are asymmetric with respect to initial fabrics assumed to be symmetric. Application of this model together with collected data on magma flow direction, dike propagation direction and mechanism, and shear sense, allow us to interpret dike fabrics in terms of shear resolved on the dike walls during intrusion (en echelon arrangement, offsetting, and dike curvature). The interpretation of AMS and vesicle fabrics of the margins of four dikes shows a reasonable agreement with the proposed theoretical models, suggesting that asymmetric fabrics can be used to infer magma flow and may provide valuable information on the shear resolved on the dike walls during intrusion. |
| |
| Keywords: | Dike segmentation Anisotropy of magnetic susceptibility Asymmetric distribution Magma flow |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
