Otway Continental Margin Transect: Crustal architecture from wide‐angle seismic profiling across Australia's southern margin

Autor:	D.M. Finlayson, I. Lukaszyk, E.C. Chudyk, C.D.N. Collins
Rok vydání:	1998
Předmět:	Shore geography geography.geographical_feature_category Structural basin Cretaceous Continental margin Lithosphere Earth and Planetary Sciences (miscellaneous) General Earth and Planetary Sciences Submarine pipeline Sedimentary rock Transect Geomorphology Geology
Zdroj:	Australian Journal of Earth Sciences. 45:717-732
ISSN:	1440-0952 0812-0099
DOI:	10.1080/08120099808728428
Popis:	The Otway Basin in southeastern Australia formed on a triangular‐shaped area of extended continental lithosphere during two extensional episodes in Cretaceous to Miocene times. The extent of the offshore continental margin is highlighted by Seasat/Geosat satellite altimeter data. The crustal architecture and structural features across this southeast Australian margin have been interpreted from offshore‐onshore wide‐angle seismic profiling data along the Otway Continental Margin Transect extending from the onshore Lake Condah High, through the town of Portland, to the deep Southern Ocean. Along the Otway Continental Margin Transect, the onshore half‐graben geometry of Early Cretaceous deposition gives way offshore to a 5 km‐thick slope basin (P‐wave velocity 2.2–4.6 km/s) to at least 60 km from the shoreline. At 120 km from the nearest shore in a water depth of 4220 m, sonobuoy data indicate a 4–5 km sedimentary sequence overlying a 7 km thick basement above the Moho at 15 km depth. Major fault zones affec...
Databáze:	OpenAIRE
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