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Instability of thermoremanence and the problem of estimating the ancient geomagnetic field strength from non-single-domain recorders #MMPMID26305946
Shaar R; Tauxe L
Proc Natl Acad Sci U S A 2015[Sep]; 112 (36): 11187-92 PMID26305946show ga
The evolution of Earth?s magnetic field is one of the greatest riddles of Earth?s past. Despite decades of paleomagnetic research, some fundamental properties of the geomagnetic field, such as the nature of its intensity fluctuation (paleointensity), are still elusive. Paleointensity is recovered from ancient materials that were thermally magnetized in the presence of the ancient field. The paleointensity procedure is based on the assumption that the ancient magnetization is stable with time. Here we show that this assumption is violated for many of the widely used materials, such as, for example, crystalline volcanic rocks. Our results put in question the reliability of much of the available paleointensity information, posing new challenges to our understanding of the ancient Earth.