Comparisons in the North Atlantic Borders
Published:January 01, 1973
This paper gives an account of present geologic activities in the northernmost part of Sweden and, in particular, of some newer ideas concerning the geologic evolution of the area. From more detailed geologic mapping, as well as several age determinations, the following have been established: (1) the existence of a cratonic nucleus dated at 2,700 m.y., or a little more, with a thick cover of geosynclinal strata (Karelian type); (2) two phases of orogenic activity (marked by folding and emplacement of granite, diorite, and syenite) separated by a phase of acidic volcanic activity at around 1,635 m.y. ago; and (3) post-granitic deformation marked by shearing, brec-ciation, and block faulting.
Figures & Tables
Following the discovery of Prudhoe Bay oil field in 1968, much attention was turned to the Arctic in the search for giant hydrocarbon accumulations. The Soviets had already proved giant reserves in their West Siberian Basin, and exploration was moving ahead quickly in the Canadian Arctic. Plans were drawn up for an AAPG Symposium on Arctic Geology and held in February 1971. Papers were selected from the Symposium for this publication and cover seven topical groupings: Regional Arctic Geology of Canada, Regional Arctic Geology of the Nordic Countries, Regional Arctic Geology of the USSR, Regional Arctic Geology of Alaska, Comparisons in the North Atlantic Borders, Evolution of the Arctic Ocean Basin, and Economics of Petroleum Exploration and Production in the Arctic.