Other
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976rspta.280..417m&link_type=abstract
Philosophical Transactions for the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 280, Issue 1298
Other
19
Scientific paper
The apparent polar wander path for Australia between 750 and 400 million years (Ma) shows rapid polar motion averaging 1 degrees /Ma. The data are derived from strati-graphic sequences, mainly in northern, central and southern Australia, that have good age control. This contrasts with other Gondwanic continents where age control is relatively poor. On the Smith-Hallam reconstruction of Gondwanaland, data from all these continents are consistent with the Australian path and suggest Gondwanaland was a unit at least as far back as 750 Ma ago. The common pole path is consistent with the widespread occurrences of Late Precambrian glacial deposits in Australia and Africa, suggesting their timing and location are related to rapid polar migration. The apparent unity of Gondwanaland through the Pan-African Orogeny at 550 ± 100 Ma provides strong support for the view that these orogenic belts were of ensialic origin. Extensive Precambrian palaeomagnetic data are consistent with a common apparent polar wander path for Australia back to at least 2500 Ma ago. The average polar wander rate of 0.3 degrees /Ma is similar to that derived for other continents. The consistency of the data irrespective of craton or the presence of some younger intervening orogenic belts provides some support to the view that these belts were also of ensialic origin.
Embleton Brian J. J.
McElhinny Michael W.
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