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Experimental reassessment of the Shaw paleointensity method using laboratory-induced thermal remanent magnetization

Experimental reassessment of the Shaw paleointensity method ...

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中国科学院地质与地球物理研究所2002学术年会

作者： John Shaw Mimi J.Hill Geomagnetism Laboratory University of LiverpoolLiverpoolUK

Artificial thermoremanent magnetization imposed on natural basalt samples was used to check the reliability of Shaw’s palaeointensity method[Shaw,1974;Kono,1978;Rolph and Shaw,1985] and to give an indication of the accuracy of ***,thermal remanence was induced in all samples(50 in total) in a known field(50±0.1 mT).This remanence was regarded as the"original"natural remanent magnetization("NRM").The samples were divided in to three subsets(A, B,and C) and intensity experiments were *** subset of samples used different thermal remanent magnetization(TRM) acquisition ***-magnetic properties on 14 representative subsamples were also measured both before and after the TRM acquisition steps to monitor possible magnetochemical *** has been demonstrated that intensity estimates by the Shaw method give values close to the expected value(50±5mT) in all three sets of basalt *** modified method with Rolph and Shaw[1985]correction,i.e.,using ratios of anhysteretic remanent magnetization given before the TRM step(ARM1) and after(ARM2),is proved to be a powerful approach to correct the TRM capacity changes that result from agnetochemical *** is especially so for sample set C, where the samples were heated up to 700 and then were held at this temperature for 40 min during TRM *** correction,45%of set C samples gave acceptable ***,some samples with strong magnetochemical alteration sometimes invalidated the ARM1/ARM2 ratio correction and gave wrong intensity *** rock magnetic properties is therefore very important when applying the Shaw method.

关键词： paleointensity thermal remanent magnetization Shaw method rock magnetic checks

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