Magnetic property zonation in a thick lava flow

H. Audunsson, S. Levi, F. Hodges

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

In this study, grain size and composition-dependent magnetic properties of titanomagnetite minerals are used as indicators of intraflow structures and magmatic evolution in an extensive and thick (30-60m) basaltic lava flow. The magnetic properties subdivide the flow to three zones. The upper layer has higher magnetic stability due to smaller and more deuterically oxidized titanomagnetite grains, approaching pure magnetite. The central layer has larger, magnetically less stable, and less oxidized grains with relatively uniform magnetic properties. The basal layer has near primary, least oxidized titanomagnetites (Ulv68Mag32). The upper intraflow boundary of the magnetic properties appears to coincide with the transition from entablature (above) to colonnade (below), distinguishing between regions of faster and slower cooling. -from Authors

Original languageEnglish
Pages (from-to)4349-4360
Number of pages12
JournalJournal of Geophysical Research
Volume97
Issue numberB4
DOIs
Publication statusPublished - 1992

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