Magnetic field intensity study of the 1960 Kilauea lava flow, Hawaii, using the microwave palaeointensity technique

Details Magnetic field intensity study of the 1960 Kilauea lava flow, Hawaii, using the microwave palaeointensity technique Magnetic field intensity study of the 1960 Kilauea lava flow, Hawaii, using the microwave palaeointensity technique

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.142..487h&link_type=abstract

Geophysical Journal International, Volume 142, Issue 2, pp. 487-504.

Astronomy and Astrophysics

Astronomy

31

Hawaii, Lava, Microwaves, Palaeointensity

Scientific paper

It is extremely valuable to study historic lava flows where the geomagnetic field at their time of extrusion is well known. In this study, two vertical sections, 16m apart, have been sampled from the approximately 1m thick 1960 Kilauea lava flow, Hawaii. Variations are seen in the rock-magnetic and palaeomagnetic properties between and within the two sections, indicating that there are small-scale lateral and vertical variations in the lava flow. The two sections showed different responses to microwave palaeointensity analysis. Section H6001 generally gave ideal linear behaviour on plots of natural remanent magnetization (NRM) lost against microwave-induced thermoremanent magnetization (TMRM) gained, whilst the majority of samples from H6002 showed anomalous two-slope behaviour. When all plots were interpreted by taking the best-fitting line through all points, the flow mean intensity for H6001 was 31.6+/-3.6μT and that for H6002 was 37.1+/-6.4μT, compared with the expected intensity of 36μT. Additional historic flows need to be studied in order to ascertain whether this behaviour is typical of all lava, and whether it is best to always interpret NRM lost/TMRM gained plots by taking the line of best fit regardless of shape.

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