Authors / CoAuthors
Higgins, K.L. | Hashimoto, T. | Fraser, G. | Rollet, N. | Colwell, J.
Abstract
Rock samples recovered during the Australian-French AUSFAIR MD153 Survey in 2006 from the northern Lord Howe Rise (LHR) and the Fairway Ridge provide new constraints on the region's tectonostratigraphic evolution. SHRIMP age dating of these rocks indicates alkali volcanism in the area at 97 Ma and 74 Ma, which was accompanied by the deposition of coarse-grained volcaniclastic sediments. The earlier volcanic activity is probably related to the widespread Upper Cretaceous magmatism along the eastern Gondwana margin, whereas the later activity may have been a precursor to the Tasman Sea opening. The pebbly clasts and shell fossils in some of the volcaniclastic rocks provide evidence both for the existence of landmasses in the northern LHR region and initial marine incursion into the area around the Campanian. The results represent significant new information in a region characterised by a paucity of dated rock samples.
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nonGeographicDataset
eCat Id
69534
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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- External PublicationScientific Journal Paper
- ( Theme )
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- petroleum exploration
- ( Theme )
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- petroleum geology
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
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2009-01-01T00:00:00
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