Seismic imaging and crustal architecture across the Lachlan Transverse Zone, a possible early cross‐cutting feature of eastern Australia

Autor: D. M. Finlayson, D. W. Johnstone, Richard Glen, J. H. Leven, R. J. Korsch
Rok vydání: 2002
Předmět:
Zdroj: Australian Journal of Earth Sciences. 49:311-321
ISSN: 1440-0952
0812-0099
DOI: 10.1046/j.1440-0952.2002.00917.x
Popis: A 2‐D crustal velocity model has been derived from a 1997 364 km north‐south wide‐angle seismic profile that passed from Ordovician volcanic and volcaniclastic rocks (Molong Volcanic Belt of the Macquarie Arc) in the north, across the Lachlan Transverse Zone into Ordovician turbidites and Early Devonian intrusive granitoids in the south. The Lachlan Transverse Zone is a proposed west‐northwest to east‐southeast structural feature in the Eastern Lachlan Orogen and is considered to be a possible early lithospheric feature controlling structural evolution in eastern Australia; its true nature, however, is still contentious. The velocity model highlights significant north to south lateral variations in subsurface crustal architecture in the upper and middle crust. In particular, a higher P‐wave velocity (6.24–6.32 km/s) layer identified as metamorphosed arc rocks (sensu lato) in the upper crust under the arc at 5–15 km depth is juxtaposed against Ordovician craton‐derived turbidites by an inferred south‐dippi...
Databáze: OpenAIRE
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