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Contrasts in mantle structure beneath Australia: relation to Tasman Lines?


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Kennett, BLN, Fishwick, S, Reading, AM and Rawlinson, N 2004 , 'Contrasts in mantle structure beneath Australia: relation to Tasman Lines?' , Australian Journal of Earth Sciences, vol. 51, no. 4 , pp. 563-569 , doi: 10.1111/j.1400-0952.2004.01075.x.

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Surface-wave tomography for the Australian region, using data mostly from portable seismic recorders,
reveals a very strong contrast in seismic shear-wave speed beneath central and western Australia
and the east of the continent. Shear-wave speeds faster than the continental average extend to at
least 200 km depth in the cratonic zone to the west of 140 degrees E. Along an approximately north-south line
there is then an eastward step to thinner lithosphere (~150 km thick) but still with fast shear-wave
speeds. A further more irregular transition to the east marks the transition to lowered shear-wave
speeds. The eastern transition at 75 km depth is in close agreement with the original Tasman Line,
whereas the two more westerly transitions do not bear a simple relation to the more recent group of
Tasman Lines defined from crustal information (outcrop and inferred geophysical trends). The westward
transition to the thickest coherent lithosphere (near 140 degrees E) may well mark the edge of the ancient
core of the continent, but the current mantle structures must bear the scars of the breakups and reassembly
that have created the current Australian continent.

Item Type: Article
Authors/Creators:Kennett, BLN and Fishwick, S and Reading, AM and Rawlinson, N
Keywords: craton, lithosphere, seismology, Tasman Line.
Journal or Publication Title: Australian Journal of Earth Sciences
ISSN: 0812-0099
DOI / ID Number: 10.1111/j.1400-0952.2004.01075.x
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