Terrestrial Palaeoecology and Global Change

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Chapter 5. Tectonic factors of global changes 155 Fig. 68. Scotia structures: (Ma) Magallanes Basin, (Na) Navarino, (SG) South Georgia. Shear zones: (B) Bransfield, (M) Magallanes, (S) Shackleton, (SS) South Sandwich. (1) Cratonic block, (2) Volcanic arc (Tobifera), (3) Foredeep, (4) Mesozoic thrust belts (Yahgan – Cumberland), (5) Palaeozoic thrust belt.
156 Valentin A. Krassilov. Terrestrial Palaeoecology Archipelago are bordering the larger crustal blocks of the Norwegian, Barents and the Beaufort – Chukchi seas (Fig. 69). The southern margin of Chukchi block is formed by the Anyuy thrust belt probably extending to the eastern De Long Islands in the Laptev Sea (Sokolov et al., 1997) to join the Lomonosov Rise zone as an annular belt of Caledonian tectonism. The Neocomian basalts of eastern Svalbard, Franz Josef Land and Barrow, Alaska (Parker, 1967; Tarakhovsky & Fishman, 1982) attest to a spreading phase synchronized Fig. 69. Arctic crustal structures interpreted as superposition Palaeozoic and Cretaceous–Eocene patterns of crustal blocks and their bordering thrust belts: (Ba) Barents block, (Bf) Beaufort block, (Ch) Chukchi block, (Ka) Kara block, (Nw) Norwegian block. Thrust belts: (AM) Alpha (Mendeleyev) Ridge, (AB) Anyuy Belt, (BR) Brooks Range, (BINZ) British Isles – Novaya Zemlya belt, (DL) De Longa Rise, (EB) Eureka Sound belt, (GR) Gakkel Ridge, (LB) Lyakhovkiy belt, (LM) Lomonosov Ridge, (WS) West Svalbard belt. Basins: (Md) Mackenzie Delta, (SV) Sverdrup. (1) Caledonian structures, those of Lomonosov Rise and eastern De Longa (thick dashes) supposedly dividing the Palaeozoic blocks, (2) Cretaceous–Tertiary thrust belts, (3) Foredeep basins, (4) Contours of continental shelf and oceanic rises.
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Terrestrial Palaeoecology and Global Change

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