By Neville F. Exon, James P. Kennett, Mitchell J. Malone
ISBN-10: 0875904165
ISBN-13: 9780875904160
ISBN-10: 1118666216
ISBN-13: 9781118666210
Published by means of the yank Geophysical Union as a part of the Geophysical Monograph sequence, quantity 151.
Ocean movement and therefore worldwide weather are nowhere extra strongly replaced than in the course of the beginning or final of gateways or seaways that hyperlink significant oceans. The break-up of Gondwana, and the northward flight of its continental fragments from Antarctica, is a working example. Profound climatic effects resulted from shifts in ocean and atmospheric move because of drastic alterations in worldwide geography.
throughout the Cenozoic, the northward flight of southern continents ended in the hole of gateways at southern excessive latitudes whereas gradually proscribing and shutting gateways within the low latitudes. huge prior learn has handled the outlet and enlargement of the 2 Cenozoic gateways—the Tasmanian Gateway south of Australia and the Drake Passage south of America—which allowed the Antarctic Circumpolar present (ACC) to increase and steadily isolate Antarctica thermally. it really is more often than not approved that complete commencing of the Tasmanian Gateway happened just before that of Drake Passage, even though the time of commencing of Drake Passage is still debatable. It has lengthy been proposed climatic threshold resulting in significant preliminary Antarctic ice sheet accumulation happened through the Eocene-Oligocene transition because the Tasmanian Gateway opened, triggering ACC formation and resultant thermal isolation of the Antarctic continent (Gateway Hypothesis). South of Australia, Paleogene rifting slowly opened the Australo-Antarctic Gulf, however the Indian and Pacific Oceans remained separated through the Tasmanian land bridge until eventually the most recent Eocene, fighting previous improvement of the ACC; waters derived from low latitudes successfully transported warmth in the direction of the Antarctic continent, contributing to the upkeep of worldwide greenhouse stipulations. Early ocean drilling within the Tasmanian Gateway among Australia and Antarctica supplied a easy framework of paleoenvironmental alterations linked to the outlet, yet stratigraphic solution used to be too restricted to completely try strength interrelationships of plate tectonics, circum-polar circulate and international weather. So, till lately, the timing of occasions has been inadequately constrained.
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Extra info for The Cenozoic Southern Ocean: Tectonics, Sedimentation, and Climate Change Between Australia and Antarctica
Example text
K. Macphail, and A. C. , 42(1), 405-433, 2002. Bryan, S. , A. E. Constantine, C. J. Stephens, A. Ewart, R. W. Schoen, and J. Parianos, Early Cretaceous volcano-sedimentary successions along the eastern Australian continental margin; implications for the break-up of eastern Gondwana, Earth Planet. Sci. , 153, 85-102, 1997. Cande, S. C , J. M. Stock, R. D. Muller, and T. Ishihara, Cenozoic motion between east and west Antarctica, Nature, 404, 145-150, 2000. Colwell, J. , M. , Rig Seismic research cruise 13: northeast Gippsland Basin and southern New South Wales margin - initial report, Bur.
The episode is seen as a strong unconformity at Site 1172 on the ETP, as the end of folding at Site 1171 on the STR [Exon et al, 2001b], and as early Eocene inversion and canyoncutting in the Gippsland Basin [Johnstone et al, 2001]. The Eocene and younger deposits on the continental slope are patchy, typically 0-500 m thick, and show evidence in places of erosion, current deposition and slumping. Sampling indicates that Neogene carbonates, often bryozoal calcarenites, are a major constituent of the upper slope [Quilty, 1985; Quilty and Telfer, 1994; Exon et al, 2002a].
Stuart-Smith, K. Romine, T. Loutit, M. Etheridge, Z. Shi, C. Foss, J. Vizy, P. Henley, and D. Kyan, Otway and Sorell Basins SEEBASE Project. SRK Consulting report, February 2002, 53 pp, 2002. Tikku, A. , and S. C. Cande, The oldest magnetic anomalies in the Australian-Antarctic basin: are they isochrons? /. Geophys. , 104, 661-677, 1999. Willcox, J. , N. F. Exon, C. S. Lee, and B. Thomas, West Tasmanian continental margin, in The Geology of Western Tasmania and Its Continental Margin - with Particular Reference to Petroleum Potential, Field excursion handout, 1989 APEA Conference, Hobart.
The Cenozoic Southern Ocean: Tectonics, Sedimentation, and Climate Change Between Australia and Antarctica by Neville F. Exon, James P. Kennett, Mitchell J. Malone
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