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AMS‐detection of inverse fabrics without AARM, in ophiolite dikes
Author(s) -
Borradaile Graham J.,
Gauthier David
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2001gl012976
Subject(s) - magnetite , dike , geology , ophiolite , magma , magma chamber , anisotropy , remanence , petrology , silicate , mineralogy , geochemistry , igneous rock , geophysics , magnetic field , volcano , seismology , tectonics , magnetization , optics , chemical engineering , physics , engineering , quantum mechanics , paleontology
“Inverse” fabric contributions from single‐domain (SD) magnetite complicate interpretation of magmatic flow from anisotropy of magnetic susceptibility (AMS) in the S. Troodos ophiolite dike swarm. Flow directions and magma chamber dimensions may only be inferred correctly if magnetic fabrics correspond to the orientation distribution (OD) of minerals. Magnetite shape‐fabrics were isolated by anisotropy of anhysteretic remanence (AARM) but AMS ambiguously merges magnetite and silicate fabrics. However, with the retrospective benefit of AARM, in this area, we recommend avoiding SD complications by excluding magnetite‐rich samples for which the bulk low‐field susceptibility >27,500 µSI. Magma‐flow was steeply upwards to the SW proximal to an axial magma chamber.