Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.142..173l&link_type=abstract
Geophysical Journal International, Volume 142, Issue 1, pp. 173-180.
Astronomy and Astrophysics
Astronomy
4
Australia, Elgee Formation, Kimberley, Palaeomagnetism, Precambrian
Scientific paper
A palaeomagnetic study of the Elgee Formation red siltstones and shales in the Palaeoproterozoic Kimberley Basin of northwestern Australia has been carried out. All seven sampling sites revealed an extremely stable magnetic remanence carried by haematite. The age of the formation is confined by precise SHRIMP U-Pb ages of early diagenetic xenotime from rocks both above and below it to be 1704+7/-14Ma, but this may represent a minimum age. The youngest detrital zircon grains in the underlying formation provide a maximum age of 1786+/-14Ma for the formation. The extreme stability of the remanence, the dissimilarity of the remanent direction from expected younger palaeomagnetic directions, and the lack of regional overprint in the 1790+/-4Ma Hart Dolerite just north of the study region support a primary origin for the remanence. A marginally positive fold test also supports a primary origin. The mean direction of D=92.2°, I=14.9°, α95=6.4° gives a palaeopole at 4.4°S, 210.0°E with dp=3.3°, dm=6.5°. This pole, a previously reported palaeopole from the Hart Dolerite and ca. 1700Ma overprint poles from the Pilbara Craton all agree with palaeopoles of similar ages from the McArthur Basin of northern Australia. Palaeomagnetic results thus suggest that the North and West Australian cratons were possibly joined together by approximately 1.7Ga.
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