Neoproterozoic orogeny along the margin of Rodinia: Valhalla orogen, North Atlantic
MetadataShow full item record
Latest Mesoproterozoic to mid-Neoproterozoic (1030–710 Ma) sedimentation and orogenic activity that developed on the northeast Laurentian substrate around the North Atlantic borderlands and is currently exposed in Scotland, Shetland, East Greenland, Svalbard, and Norway, is herein defined as the Valhalla orogen. The site for the orogen was initiated by ∼95° of clockwise rotation of Baltica with respect to Laurentia at the end of the Mesoproterozoic. This created a triangular ocean basin, the Asgard Sea, which received orogenic detritus from the Grenville-Sveconorwegian-Sunsas orogen.Sedimentary successions within the orogen accumulated during two cycles at 1030–980 Ma and 910–870 Ma, with each cycle terminated and the successions stabilized during tectonothermal episodes involving crustal thickening and igneous activity, some of calc-alkaline affinity, associated with the Renlandian (980–910 Ma) and Knoydartian (830–710 Ma) orogenic events. The Valhalla orogen represents an exterior accretionary orogen that developed along the margin of Laurentia and the Asgard Sea. The early stages of the Valhalla orogen are coeval with the final stages of the Grenville-Sveconorwegian-Sunsas orogen to the south, but are tectonically discrete; they constitute part of an exterior orogen that is entirely distinct from the interior orogen formed between collision of Laurentia, Baltica, and Amazonia.
Showing items related by title, author, creator and subject.
Post-kinematic lithospheric delamination of the Wuyi–Yunkai orogen in South China: Evidence from ca. 435 Ma high-Mg basaltsYao, Weihua; Li, Zheng-Xiang; Li, W.; Wang, Xuan-Ce; Li, X.; Yang, J. (2012)Understanding the processes responsible for the intra-plate early Paleozoic Wuyi–Yunkai orogeny (> 460 Ma to 420–415 Ma) in the South China Block (SCB) is important for deducing the interactions of this block with other ...
Rapid cooling and exhumation in the western part of the Mesoproterozoic Albany-Fraser Orogen, Western AustraliaScibiorski, E.; Tohver, E.; Jourdan, Fred (2014)The Albany-Fraser Orogen of southwestern Australia is an understudied orogenic belt, which is interpreted to record the Mesoproterozoic suturing of the Yilgarn Craton of Western Australia to the Mawson Craton of East ...
Rapid cooling and exhumation in the western part of the Mesoproterozoic Albany-Fraser Orogen, Western AustraliaScibiorski, E.; Tohver, E.; Jourdan, Fred (2015)© 2015 Elsevier B.V. The Albany-Fraser Orogen of southwestern Australia is an understudied orogenic belt, which is interpreted to record the Mesoproterozoic suturing of the Yilgarn Craton of Western Australia to the Mawson ...