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Antarctica and Global Paleogeography: From Rodinia, Through Gondwanaland and Pangea, to the Birth of the Southern Ocean and the Opening of Gateways--T. H. Torsvik, C. Gaina, and T. F. Redfield
Pages 125-140

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From page 125... ... This path predicts that EANT Extending from the Ross to the Weddell Seas, the Transwas located at tropical to subtropical southerly latitudes from antarctic Mountains (Figure 1) effectively divide Antarctica ca. Read the entire page →
From page 126... ... , breakup at ~175 Ma with relative plate circuits we are able EANT drifted southward (8-11 cm/yr; latitudinal velocity to construct a Synthetic Apparent Polar Wander (SAPW) calculated from Figure 3b) Read the entire page →
From page 127... ... Jurassic WEST ANTARCTICA AND PALAEOMAGNETIC DATA to Early Cretaceous (between 175 Ma and 140 Ma) paleoIn contrast with the great lumbering elephant of continental magnetic poles from AP differ from the EANT SAPW path EANT, WANT comprises several distinct crustal blocks while Early Cretaceous (110 Ma) Read the entire page →
From page 128... ... WANT West Antarctica WAUS Western Australia, Cratonic Australia west of the Tasman line (now part of AUS) lowed by convergence (Weddell Sea partial subduction) Read the entire page →
From page 129... ... in EANT based on the SAPW path in Figure 3a. However, the last 100 Ma is calculated from a moving hotspot frame. Read the entire page →
From page 130... ... are compared with the EANT SAPW path (yellow A95 ovals) 390 2 138.6 –36.4 348.7 as in Figure 3a for the last 200 Ma, but ﬁtted with small circles that 400 1 –––– –33.9 017.6 have RMS values less than 0.6°. Read the entire page →
From page 131... ... 50 MBL-EANT 18.2 162.1 –1.7 were probably linked to Kalahari (South Africa) during the 50 SAM-SAFR 58.2 –031.2 20.5 Neoproterozoic (Figure 5) Read the entire page →
From page 132... ... , the Maurice Ewing Bank (MEB) , the between the Shackleton Range, the Bunger Hills caused EWM and FB block located near South Africa, and DML by collision with South Africa (including the Kalahari and (Figure 6) Read the entire page →
From page 133... ... White arrows denote absolute plate motion vectors. Mean plate velocities indicated for EANT and Patagonia (P) Read the entire page →
From page 134... ... Oceanic basins: ThO-Neotethys, PPAC = netic and gravity signatures allows us to reconstruct the age Paleo-Paciﬁc oceans, Wsea = Weddell Sea, RLSea = Riiser-Larsen and extent of oceanic crust through time. However, subduc- Sea; MB = Mozambique basin; EB = Enderby Basin; PAP = Perth tion, complex seaﬂoor spreading or massive volcanism can Abyssal Plain. Read the entire page →
From page 135... ... , but interpretation of new geophysical data and thus we assume symmetric seaﬂoor spreading. indicates that Gondwana breakup probably commenced in Late Jurassic and Early Cretaceous motion vectors show the Weddell Sea (Figure 8) Read the entire page →
From page 136... ... is recognized in the SAPW path at around 130 Ma signifying a major change in plate driving forces for EANT. Initial exhumation of the Transantarctic Mountains may have begun at this time in the Scott Glacier region (Fitzgerald and Stump, 1992) Read the entire page →
From page 137... ... The most ancient fragments once the Transantarctic Mountains (TAM) at ~55 Ma is well docu- basked beneath a tropical Precambrian sun, in communion mented (Fitzgerald and Gleadow, 1988; Fitzgerald, 2002) Read the entire page →
From page 138... ... Journal of Geophysical Research Antarctic ice sheet. In The West Antarctic Ice Sheet; Behavior and Envi- 98:13815-13833. Read the entire page →
From page 139... ... 2000. The Cape Fold Belt and Syntaxis and the rotated Geological Society of London Special Publication 108:243-264. Read the entire page →
From page 140... ... 2000. Age and palaeomagnetism of the Mundine Well dyke swarm, Western Australia: Implications for an Australia-Laurentia connection at 755 Ma. Read the entire page →

From page 125...

... This path predicts that EANT Extending from the Ross to the Weddell Seas, the Transwas located at tropical to subtropical southerly latitudes from antarctic Mountains (Figure 1) effectively divide Antarctica ca.

Antarctica and Global Paleogeography: From Rodinia, Through Gondwanaland and Pangea, to the Birth of the Southern Ocean and the Opening of Gateways--T. H. Torsvik, C. Gaina, and T. F. Redfield Pages 125-140

Antarctica and Global Paleogeography: From Rodinia, Through Gondwanaland and Pangea, to the Birth of the Southern Ocean and the Opening of Gateways--T. H. Torsvik, C. Gaina, and T. F. Redfield
Pages 125-140