Author: Kidane T. B. Fuller M. Otofuji Y-I.
Publisher: Taylor & Francis Ltd
ISSN: 0812-0099
Source: Australian Journal of Earth Sciences, Vol.57, Iss.2, 2010-03, pp. : 231-241
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Abstract
Ocean Drilling Program Leg 194 was carried out in the Marion Plateau, located to the northeast of Australia. Drilling penetrated few metres of altered olivine basalt flows, underlying the sediments. Shipboard paleomagnetic investigations on these basalts resulted in well-defined paleomagnetic directions. The directions from the archive-half long-core measurements at hole 1193C between 540.97 and 543.97 m below seafloor, together with the archive-half long-core and discrete measurements from the working-half of hole 1198B between 513.85 and 517.25 m below seafloor, yielded an overall mean inclination value of 52.7° (α95 = 4.0°, K = 537, n = 129, N = 4). These give the paleolatitude of the Marion Plateau to be 33.3°S with upper and lower 95% confidence limit 37.3°S and 29.6°S, respectively. Comparison of the corresponding paleo-colatitude result with the Australian apparent polar wander path indicates a possible emplacement time for the basalt of either 130-110 Ma or 190-165 Ma. The latter result is in better agreement with the available 40Ar/39Ar age of 162 ± 0.9 Ma reported for the basalt.
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