Timing and geometry of early Gondwana breakup
The Mesozoic opening history of the southern ocean between South America, Africa and Antarctica is one of the largest gaps in knowledge on the evolution of this region. Competing geodynamic models were published during the last two decades to explain the geophysical and geological observations. Here...
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ftawi:oai:epic.awi.de:4483 2024-09-15T17:44:26+00:00 Timing and geometry of early Gondwana breakup Jokat, Wilfried Boebel, T. König, Matthias Meyer, U. 2003 https://epic.awi.de/id/eprint/4483/ https://doi.org/10.1029/2002JB001802 https://hdl.handle.net/10013/epic.15058 unknown Jokat, W. orcid:0000-0002-7793-5854 , Boebel, T. , König, M. and Meyer, U. (2003) Timing and geometry of early Gondwana breakup , Journal of Geophysical ResearchB9), 108 . doi:10.1029/2002JB001802 <https://doi.org/10.1029/2002JB001802> , hdl:10013/epic.15058 EPIC3Journal of Geophysical ResearchB9), 108, 2428 p. Article isiRev 2003 ftawi https://doi.org/10.1029/2002JB001802 2024-06-24T03:54:51Z The Mesozoic opening history of the southern ocean between South America, Africa and Antarctica is one of the largest gaps in knowledge on the evolution of this region. Competing geodynamic models were published during the last two decades to explain the geophysical and geological observations. Here we report on aeromagnetic data collected along the East Antarctic coast during five seasons. These data provide new constraints on the timing and geometry of the early Gondwana break-up. In the Riiser-Larsen Sea/Mozambique Basin, the first oceanic crust between Africa and Antarctica formed around 155 Ma. In the west the Weddell Rift propagated from west to east with a velocity of 63 km/Myr between chrons M19N and M17N. At chron M14N South America and Africa finally were split off the Antarctic continent. Stretching in the area of the South Atlantic started at the latest from 155 Myr onwards. The different spreading velocities and directions of South America and Africa created at chron M9N the first oceanic crust in the South Atlantic. A new model indicates that the Karoo and Dronning Maud Land magmatism occurred well before any new ocean floor was created and, therefore, the first formation of new oceanic crust cannot directly be related to a plume interaction. Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land Riiser-Larsen Sea Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Journal of Geophysical Research: Solid Earth 108 B9 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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description |
The Mesozoic opening history of the southern ocean between South America, Africa and Antarctica is one of the largest gaps in knowledge on the evolution of this region. Competing geodynamic models were published during the last two decades to explain the geophysical and geological observations. Here we report on aeromagnetic data collected along the East Antarctic coast during five seasons. These data provide new constraints on the timing and geometry of the early Gondwana break-up. In the Riiser-Larsen Sea/Mozambique Basin, the first oceanic crust between Africa and Antarctica formed around 155 Ma. In the west the Weddell Rift propagated from west to east with a velocity of 63 km/Myr between chrons M19N and M17N. At chron M14N South America and Africa finally were split off the Antarctic continent. Stretching in the area of the South Atlantic started at the latest from 155 Myr onwards. The different spreading velocities and directions of South America and Africa created at chron M9N the first oceanic crust in the South Atlantic. A new model indicates that the Karoo and Dronning Maud Land magmatism occurred well before any new ocean floor was created and, therefore, the first formation of new oceanic crust cannot directly be related to a plume interaction. |
format |
Article in Journal/Newspaper |
author |
Jokat, Wilfried Boebel, T. König, Matthias Meyer, U. |
spellingShingle |
Jokat, Wilfried Boebel, T. König, Matthias Meyer, U. Timing and geometry of early Gondwana breakup |
author_facet |
Jokat, Wilfried Boebel, T. König, Matthias Meyer, U. |
author_sort |
Jokat, Wilfried |
title |
Timing and geometry of early Gondwana breakup |
title_short |
Timing and geometry of early Gondwana breakup |
title_full |
Timing and geometry of early Gondwana breakup |
title_fullStr |
Timing and geometry of early Gondwana breakup |
title_full_unstemmed |
Timing and geometry of early Gondwana breakup |
title_sort |
timing and geometry of early gondwana breakup |
publishDate |
2003 |
url |
https://epic.awi.de/id/eprint/4483/ https://doi.org/10.1029/2002JB001802 https://hdl.handle.net/10013/epic.15058 |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land Riiser-Larsen Sea Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land Riiser-Larsen Sea Southern Ocean |
op_source |
EPIC3Journal of Geophysical ResearchB9), 108, 2428 p. |
op_relation |
Jokat, W. orcid:0000-0002-7793-5854 , Boebel, T. , König, M. and Meyer, U. (2003) Timing and geometry of early Gondwana breakup , Journal of Geophysical ResearchB9), 108 . doi:10.1029/2002JB001802 <https://doi.org/10.1029/2002JB001802> , hdl:10013/epic.15058 |
op_doi |
https://doi.org/10.1029/2002JB001802 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
108 |
container_issue |
B9 |
_version_ |
1810492022943907840 |