Li X.,Guangzhou Marine Geological Survey Key Laboratory of Marine Mineral Resources |
Yao Y.,Guangzhou Marine Geological Survey Key Laboratory of Marine Mineral Resources |
Yang C.,Guangzhou Marine Geological Survey Key Laboratory of Marine Mineral Resources |
Chen Z.,Wuhan University |
And 2 more authors.
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2015
It is quite big area, with about 21 × 106km2, in the north of Arctic Circle, and complicated in tectonics. A basal structural map of Arctic area was compiled, based on the published data. It can be suggested that Precambrian base is composed of 3 cratons, such as Laurentia, Siberian and Baltica, and some terrains between them. The main orogenic belts include Baikalides, Caledonides, Hercynides, Verkhoyansk, and New Siberian-Chukotka-Brooks orogenic belts. Based on the tectonic features, the Arctic area should undergo the following main tectonic events in Phanerozoic Eon: 1)Baikalidian movement in Late Neoproterozoic-Early Cambrian, which resulted in the collision of Baltica continent with Svalbard-Kara massif and formation of Baikalides; 2)Caledonian movement in Late Silurian-Early Carbonferous, which resulted in the formation of Caledonides around the Laurentia continent; 3)Hercynidian movement in Late Palaeozoic-Early Mesozoic, which led to the collision between Baltica continent and Siberian continent; 4)Microplate of Alaska-Chukotka split from the north margin of Canada; and the Canadian Ocean started opening as the breakup of Pangea in Jurassic; 5)Alaska-Chukotka microplate shifted forward to the Siberia and collided to the northern Siberia in Early Cretaceous, which resulted in the formation of Verkhoyansk and New Siberian-Chukotka-Brooks orogenic system. In consideration with the limited geological and geophysical survey, further research is needed to discover much more tectonic features in Arctic region. ©, 2015, Jilin University Press. All right reserved.