Creation and destruction of Weddell Sea floor in the Jurassic

Research Article| July 01, 1993 Creation and destruction of Weddell Sea floor in the Jurassic A. M. Grunow A. M. Grunow 1Byrd Polar Research Center, Ohio State University, Columbus, Ohio 43210 Search for other works by this author on: GSW Google Scholar Geology (1993) 21 (7): 647–650. https://doi.org/10.1130/0091-7613(1993)021<0647:CADOWS>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation A. M. Grunow; Creation and destruction of Weddell Sea floor in the Jurassic. Geology 1993;; 21 (7): 647–650. doi: https://doi.org/10.1130/0091-7613(1993)021<0647:CADOWS>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract New paleomagnetic data invite reassessment of the breakup history of parts of the Pacific margin of Gondwana due to the Mesozoic opening of the southern ocean basins. These data indicate clockwise rotation of the Antarctic Peninsula relative to East Antarctica between ∼175 and ∼155 Ma that would have created as much as 1000 km of pre-anomaly M25 ocean floor in the Weddell Sea basin. The paleomagnetic data also suggest that between ∼155 and ∼130 Ma, the Antarctic Peninsula rotated counterclockwise relative to East Antarctica, rotation that, along with the southward motion of East Antarctica, would have caused subduction of the newly created Weddell Sea ocean floor beneath the southern Antarctic Peninsula. East-vergent folding and thrusting of Jurassic back-arc basin rocks along the southeastern Antarctic Peninsula, known as the Palmer Land event, probably resulted from deformation along this newly created convergent margin. The presence of Jurassic Weddell Sea floor would have isolated eastern Gondwana (East Antarctica, Australia, and India) from the Antarctic Peninsula and western Gondwana (Africa and South America), encouraging increased marine faunal connections between the Pacific and Weddell Sea- Mozambique-Somali ocean basins during the ∼175 to ∼130 Ma interval. After ∼130 Ma, the Antarctic Peninsula would have been connected to East Antarctica via the other West Antarctic terranes, thereby facilitating land migrations between eastern and western Gondwana. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.