Interpreting inverse magnetic fabric in Miocene dikes from Eastern Iceland

Daniele Trippanera, M. Porreca, S. Urbani, C. Kissel, A. Winkler, L. Sagnotti, S. Nazzareni, V. Acocella

Research output: Contribution to journalArticlepeer-review

Abstract

Anisotropy of Magnetic Susceptibility (AMS) is a valid tool to investigate magma flow direction within dikes. However, geometrically inverse magnetic fabric characterized by maximum magnetic susceptibility axis (kmax) perpendicular to the dike wall, may complicate the interpretation of flow trajectories. To better understand the nature of this fabric, we present a multi-scale study on 19 dikes (383 samples) in the Miocene Alftafjordur volcanic system (Iceland), where 80% of the samples show a geometrically inverse magnetic fabric. We carried out (1) AMS measurements at different magnetic fields and temperatures, along with Anisotropy of Anhystheretic Remanent Magnetization (AARM) analysis; (2) Hysteresis loops and FORC diagrams; (3) thin section analysis; (4) structural fieldwork. A variable Ti-content (10
Original languageEnglish (US)
JournalJournal of Geophysical Research: Solid Earth
DOIs
StatePublished - Oct 29 2020

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