Early Oligocene ice-sheet expansion on Antarctica: Stable isotope and sedimentological evidence from Kerguelen Plateau, southern Indian Ocean

Geology ◽  
1992 ◽  
Vol 20 (6) ◽  
pp. 569 ◽  
Author(s):  
James C. Zachos ◽  
James R. Breza ◽  
Sherwood W. Wise
2010 ◽  
Vol 82 (3) ◽  
pp. 747-760 ◽  
Author(s):  
Cristianini T. Bergue ◽  
Abiraman Govindan

The Eocene-Pliocene deep sea ostracodes from the ODP site 744A (Kerguelen Plateau) are herein studied under the taxonomic and paleoecologic aspects. 28 species are identified, being the genera Krithe, Cytherella and Dutoitella the most diversified. A faunal threshold was recorded in the Early Oligocene, which is tentatively explained under the knowledge of the paleoceanographical studies carried out not only in the Kerguelen Plateau but also in adjacent areas. The faunal turnover and variations in both richness and abundance possibly reflect the inception of psychrosphere and the influence of hydrological changes in the preservation of carapaces. Moreover, the influence of those changes on carbonate preservation is discussed as the cause of faunal impoverishment in the upper portion of the core.


2020 ◽  
Author(s):  
Thomas Westerhold ◽  
Gabriele Uenzelmann-Neben

<p>Kerguelen Plateau (KP), one of the world’s largest Large Igneous Provinces, is located in a key region in the southern Indian Ocean. Its complex topography has a strong influence on pathways of water masses within the Antarctic Circumpolar Current (ACC) and the Antarctic Bottom Water (AABW). Thick sediment packages deposited on top and around KP are a high-fidelity recorders of significant modifications in pathways and intensities of water masses flowing across the KP during the Cenozoic. Already the previously ODP spot cored sedimentary sequences demonstrated their outstanding potential as a far-field monitor for the evolution of the Antarctic Ice Sheet, for the climate variability in the Warmhouse World of the middle to late Eocene, for changes in ocean circulation, and for migration of the Polar Frontal System. Here we propose to revisited KP and recover a complete, multiple-hole drilled, carbonate rich sedimentary successions from Labuan and Ragatt Basin area by an IODP Expedition. Only high-quality drilled, undisturbed new material will allow studying the interaction of climatic and tectonic changes of the last 66 million years and provide important information on the formation and dynamics of the Antarctic ice sheet due to the unique location of the KP.</p>


Geotectonics ◽  
2018 ◽  
Vol 52 (5) ◽  
pp. 499-515 ◽  
Author(s):  
G. L. Leitchenkov ◽  
E. P. Dubinin ◽  
A. L. Grokholsky ◽  
G. D. Agranov

2016 ◽  
Vol 63 (4) ◽  
pp. 379-392 ◽  
Author(s):  
R. A. Duncan ◽  
T. J. Falloon ◽  
P. G. Quilty ◽  
M. F. Coffin

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