Mathematics – Logic
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmgp72a0989s&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #GP72A-0989
Mathematics
Logic
1521 Paleointensity, 6240 Meteorites And Tektites
Scientific paper
A preliminary study involving Calcium-Aluminum inclusions (CAI's) found within primitive chondrite meteorites was conducted using standard paleomagnetic methods to illustrate that paleomagnetism can be successfully applied to the study of CAI's, to show that the proposed project is viable. The objective of the project is to determine the strength of the early magnetic field, its development and intensity levels at the time of formation of the meteorite in our early solar system. Key anticipated milestones will be to derive a magnetic signature from CAI's determining the earliest known magnetic field to exist in our solar system, and to better understand the nature of the magnetic fields during the period of planet formation.
Slices of the Allende meteorite (CV3) provided the source of the CAI's. The meteorite has little or no shock features, is considered very fresh, hard and well consolidated. The CAI's have sharp boundaries and are whitish-grey with uniform color. Two are fine-grained with an irregular, contorted shape. The third is roughly spherical and blocky-course grained. The preliminary study involved five samples. Three were CAI's incased in a magnetically inert material and two were blanks used for comparison. The magnetic signatures of the five samples were determined by using the Shaw method (Shaw, J., 1974). This method involves comparing two anhysteretic remanent magnetizations (ARM's) created before and after heating. The comparison allows selection of a coercive force region within which the heating has not changed the magnetic properties. The process produces four tables of AF demagnetization: NRM, ARM1, TRM and ARM2. The results of the analysis show the CAI's found within the Allende meteorite contain a measurable magnetic signature of TRM origin, and therefore the project is viable. The paleofields for two of the specimens are 5.2E-07T (0.0052E-04T) and 5.4E-07T (0.0054E-04T) respectively. The preliminary paleomagnetic and rock magnetic experiments were performed at the Institute of Rock Magnetism. Shaw,J., 1974. A New Method of Determining the Magnitude of the Palaeomagnetic Field; Application to five historic lavas and five archaeological samples. Geophys. J. R. Astr. Soc., V.39, pg 133-141.
Herrero-Bervera Emilio
Smethurst M. T.
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