A palaeointensity study of lower carboniferous transitional geomagnetic field directions:the Cockermouth lavas, northern England

Oppenheim, Matthew and Piper, John and Rolph, Timothy (1994) A palaeointensity study of lower carboniferous transitional geomagnetic field directions:the Cockermouth lavas, northern England. Physics of the Earth and Planetary Interiors, 82 (1). pp. 65-74.

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Abstract

Palaeomagnetic and palaeointensity results are reported from a thin succession of lavas erupted in Lower Carboniferous times (ca. 355 Ma) in northern England. Characteristic magnetisations were apparently acquired at the time of eruption but the stable (normal) field direction is recovered from only two sites out of seven. The remainder are not compatible with younger overprinting and are interpreted as thermo remanent magnetisations (TRMs) recording transitional fields. Palaeointensity studies employing the Shaw method identify main field intensities averaging 20.8 μT within the range of estimates of the Lower Carboniferous field intensity from studies elsewhere. In contrast, the lavas recording transitional field directions yield palaeointensity estimates which fall mostly between 10 and 20% of this value. Hence it is inferred that Palaeozoic field inversions were, like Recent examples, characterised by a general decline in the intensity of the field.

Item Type:
Journal Article
Journal or Publication Title:
Physics of the Earth and Planetary Interiors
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1912
Subjects:
ID Code:
70676
Deposited By:
Deposited On:
08 Sep 2014 07:46
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jan 2020 08:58