Rock magnetic properties and palaeointensity determinations on Santorini historical lava flows (original) (raw)

Abstract

A detailed rock magnetic study of eight historical dacitic lava flows from Santorini, covering the time interval between 46 AD and 1950 AD, is presented along with palaeointensity determinations encompassing different experimental approaches such as: the classical Thellier-Thellier method (Thellier and Thellier 1959), Coe's version of the Thellier-Thellier method (Coe 1967), Shaw's alternating field method (Shaw 1974), the Microwave Thellier-Thellier approach (Walton et al. 1992, 1993) and the continuous high temperature magnetisation measurement method recently developed by Le Goff and Gallet (2004). The obtained palaeointensity results are compared with the Greek data base and the International Geomagnetic Reference Field (IGRF). Eventually, non-dipole field variations at Athens during the past 2000 years are discussed and compared with those at Paris. Thermomagnetic and isothermal magnetisation curve measurements reveal the presence of two physically distinct magnetic min...

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