Geochemical measurements of the Tasmanian Gateway from ODP Hole 189-1172A ...
Tectonic changes that produced a deep Tasmanian Gateway between Australia and Antarctica are widely invoked as the major mechanism for Antarctic cryosphere growth and Antarctic Circumpolar Current (ACC) development during the Eocene/Oligocene (E/O) transition (34-33 Ma). Ocean Drilling Program (ODP)...
Main Authors: | , , , , , , , , , |
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Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2004
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Subjects: | |
Online Access: | https://dx.doi.org/10.1594/pangaea.742605 https://doi.pangaea.de/10.1594/PANGAEA.742605 |
Summary: | Tectonic changes that produced a deep Tasmanian Gateway between Australia and Antarctica are widely invoked as the major mechanism for Antarctic cryosphere growth and Antarctic Circumpolar Current (ACC) development during the Eocene/Oligocene (E/O) transition (34-33 Ma). Ocean Drilling Program (ODP) Leg 189 recovered near-continuous marine sedimentary records across the E/O transition interval at four sites around Tasmania. These records are largely barren of calcareous microfossils but contain a rich record of siliceous- and organic-walled marine microfossils. In this study we integrate micropaleontological, sedimentological, geochemical, and paleomagnetic data from Site 1172 (East Tasman Plateau) to identify four distinct phases (A-D) in the E/O Tasmanian Gateway deepening that are correlative among ODP Leg 189 sites. Phase A, prior to 35.5 Ma: minor initial deepening characterized by a shallow marine prodeltaic setting with initial condensation episodes. Phase B, 35.5-33.5 Ma: increased deepening marked ... : Supplement to: Stickley, Catherine E; Brinkhuis, Henk; Schellenberg, Stephen A; Sluijs, Appy; Fuller, Michael D; Grauert, M; Röhl, Ursula; Warnaar, Jeroen; Wiliams, Graham L (2004): Timing and nature of the deepening of the Tasmanian Gateway. Paleoceanography, 19(4), PA4026 ... |
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