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Reply to comment by F. Speranza et al. on “Recent eruptive history of Stromboli (Aeolian Islands, Italy) determined from high‐accuracy archeomagnetic dating”
Author(s) -
Arrighi Simone,
Tanguy JeanClaude,
Courtillot Vincent,
LeGoff Maxime
Publication year - 2005
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 - 10.1029/2005gl023768
Subject(s) - demagnetizing field , geology , paleomagnetism , remanence , natural remanent magnetization , geophysics , seismology , magnetization , physics , magnetic field , quantum mechanics
The contribute of paleomagnetism to the stratigraphy of the middle-late Pleistocene (Brunhes Chron).This manuscript presents an updated summary on the contribute brought by paleomagnetism to the definition of a high-resolutionmagnetic stratigraphy for the middle-late Pleistocene. The middle-late Pleistocene spans a time intervals during which the Earthmagnetic field held predominantly a stable normal polarity and includes the whole normal polarity Brunhes Chron. In absence of fullreversals of the geomagnetic field, magnetic stratigraphy is based upon (a) the record of geomagnetic paleosecular variations (PSV), asdocumented in archaeological or volcanic material and in lacustrine and marine sedimentary sequences for the last few ka,(b) the variation of geomagnetic paleointensity and (c) the occurrence of geomagnetic excursions. With regards to Europe, archeomagnetic PSV curves were reconstructed back to 8 ka (i.e., ca. 6000 BC), whereas continuous PSV records based on paleomagnetism of sediments extend back to the last 10-12 ka. The variation in intensity of the earth magnetic field has been reconstructed in the detail at a global scale for the last 800 ka. Relative paleointensity curves reconstructed in sedimentary sequences provide original correlation and dating tools and are particularly valuable to establish high-resolution age models in sequences that may lack other valuable stratigraphic proxies, such as those deposited in thecarbonate-corrosive waters of peri-Antarctic margins. Finally, the recognition and the dating of geomagnetic excursions, defined as sharp, short-lived and wide geomagnetic variations, during which the earth magnetic field has departed from its usual near-axial configuration but did not give rise to complete reversals, is providing the basis for the establishment of a Geomagnetic Instability Time Scale (GITS) that extends back to the last 2.2 Ma