Arctic Alaska-Chukotka terrane
The Arctic Alaska-Chukotka terrane (AAC) is a
The AAC originated on the shores of the
The Proterozoic–Carboniferous histories of Arctic Alaska and Chukotka are similar but their Triassic–Jurassic histories are apparently distinct. Whether or not they were separate blocks before the Mesozoic opening of the Amerasia Basin is disputed.[3] The age of the basement of the AAC remains enigmatic, hence also details about the microcontinent's ancient, tectonic history. It is, nevertheless, clear from Neoproterozoic igneous rocks that the AAC was not originally part of Laurentia, but most likely Baltica. The microcontinent was obviously involved in a series of magmatic events, beginning at c. 1.6–1.4 Ga, and ending in the Avalonia–Cadomian orogeny.[4]
References
Notes
- ^ a b Strauss et al. 2017, Introduction, pp. 649–652
- ^ Till 2016, Arctic Alaska–Chukotka Microplate, p. 220
- ^ Till 2016, Arctic Alaska and Chukotka—One Microplate or Two?, pp. 232–233
- ^ Amato et al. 2014, Abstract
Sources
- Amato, J. M.; Aleinikoff, J. N.; Akinin, V. V.; McClelland, W. C.; Toro, J.; Dumoulin, J. A.; Till, A. B. (2014). "Age, chemistry, and correlations of Neoproterozoic–Devonian igneous rocks of the Arctic Alaska–Chukotka terrane: An overview with new U-Pb ages. Reconstruction of a Late Proterozoic to Devonian Continental Margin Sequence, Northern Alaska, its Paleogeographic Significance, and Contained Base-Metal Sulfide Deposits". Geological Society of America Special Papers. 506: 29–57. .
- Strauss, J. V.; Hoiland, C. W.; Ward, W. P.; Johnson, B. G.; Nelson, L. L.; McClelland, W. C. (2017). "Orogen transplant: Taconic–Caledonian arc magmatism in the central Brooks Range of Alaska" (PDF). GSA Bulletin. 129 (5–6): 649–676. doi:10.1130/b31593.1. Retrieved 19 July 2018.
- Till, A. B. (2016). "A synthesis of Jurassic and Early Cretaceous crustal evolution along the southern margin of the Arctic Alaska–Chukotka microplate and implications for defining tectonic boundaries active during opening of Arctic Ocean basins". Lithosphere. 8 (3): 219–237. doi:10.1130/L471.1.
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