Lower Ordovician reversal asymmetry: An artifact of remagnetization or nondipole field disturbance?

T Torsvik, Allan Trench

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Five stratigraphically linked polarity intervals (R1 → R5 and N1 → N5) from Late Arenig to Early Caradoc (Ordovician) times are recognized within the Gullhogen Limestone section, southern Sweden. A conspicuous reversal asymmetry, in which the remanence directions of the two lowermost normal polarity sections (N1 and N2) depart significantly from otherwise nearly antiparallel and typical Lower Ordovician directions, has been identified. This reversal asymmetry is mainly in declination. Nonzonal nondipole field disturbances, lasting some 1-1.5 m.y. are suggested as a likely source, in order to explain these normal polarity anomalies. -from Authors

Original languageEnglish
Pages (from-to)17885-17898
JournalJournal of Geophysical Research
Volume100
Issue numberB9
DOIs
Publication statusPublished - 1995

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