The magnetic fabric of some dolerite intrusions,northeast Spitsbergen; implications for their mode of emplacement |
| |
Authors: | Erik Halvorsen |
| |
Institution: | Department of Geophysics, University of Bergen, Bergen Norway |
| |
Abstract: | The titanomagnetite fabric of some dolerites from two areas of northeast Spitsbergen, Lomfjorden and the Bastian, and Rønnbeck islands have been studied by means of magnetic susceptibility anisotropy measurements. The shape and orientation of the susceptibility ellipsoids were determined with an a.c. bridge. Both areas showed a dominating magnetic foliation in the horizontal plane. A weakly developed preferred orientation of the maximum (KI) and intermediate (KII) susceptibility axis within the magnetic foliation plane was found, the KI-axis striking predominantly E-W and the KII-axis striking N-S. The magnetic fabric is interpreted as resulting from horizontal movement of magma. It is concluded that the Bastian and Rønnbeck islands are the relics of one or more larger sills. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|