By Martin H. P. Bott (auth.), Martin H. P. Bott, Svend Saxov, Manik Talwani, Jörn Thiede (eds.)
A staff of geoscientists from a few NATO international locations met less than NATO sponsorship in Copenhagen on February 27 and 28, 1978, and formulated an offer entitled "EVOLUTION OF THE GREENLAND ICELAND-FAEROE-SCOTLAND RIDGE, A KEY sector IN MARINE GEOSCIENCE". This a part of the North Atlantic Ocean is of specific curiosity due to its anomalously shallow bathymetry which has profoundly prompted many facets of the evolution of the North Atlantic. The proposed investigations hence objective to review the deep crustal constitution together with courting of continental and oceanic crust, historical past of subsidence of the ridge together with its previous position as a land bridge, age of the oceanic basement alongside it and its background of formation, and the impact of the ridge on Tertiary and Quaternary depositional palaeoenvironments. In furtherance of this suggestion, it truly is meant to hold out a chain of seismic and drilling operations at the Ridge in the course of the coming years. those significant marine investigations may be more often than not funded from nationwide assets. an incredible initial degree to the undertaking is the collec tion and synthesis of obtainable info. NATO has already authorized a small price range for this function which has enabled a geoscientist to paintings partially on the division of Geological Sciences of Durham college, united kingdom, and partially at Lamont-Doherty Geological Observatory of Columbia college, Palisades, united states, for roughly six months to bring together the information. crucial map displaying magnetic anomalies and lineations within the zone, is integrated in a pocket in the back of this volume.
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Extra info for Structure and Development of the Greenland-Scotland Ridge: New Methods and Concepts
BJORNSSON 6 e f :1:~ Seismic station Epicenter fissure swarm SOlem e SS' N I ICELAND 65"N Vatna,oku\1 18"W Fig. 12. 14W S-wave propagation across the axial rift zone in NEIceland. S-wave paths are shown with lines connecting epicenters and seismograph stations. Numbers indicate the depth of penetration of the respective ray (From Sanford and Einarsson, 1981). UPPER MANTLE BENEATH ICELAND Electrical Resistivity of the Lower Crust and Mantle Beblo and Bjornsson (1978, 1980) carried out short period magnetotelluric measurements at 19 sites distributed over the northern volcanic zone and the adjoining older Tertiary flood basalt areas.
If a general continuous zone of magma underlies the axial rift zone, the depth to its top is at least 10 km in NE Iceland. This does not preclude the existence of small magma bodies at higher levels. Zones of high S-wave attenuation have been identified at 3 to 7 km depth under the Krafla volcano (Einarsson, 1978), and gaps in the seismic zone on the Reykjanes Peninsula were interpreted as possible indicators of small magma bodies (Klein et al. 1977). On the Peninsula earthquakes occur from the surface down to 9 km depth, indicating a minimum thickness of the brittle crust near the plate boundary.
1981a, Structure and plate tectonic evolution of the marine arctic as revealed by aeromagnetics, Oceanol. Acta, Special Issue (Geology of Oceans):25. Vogt, P. , Feden, R. , 1978, The ocean crust west and north of the Svalbard Archipelago: synthesis and review of new results, Polarforschung, 48:1. , Johnson, G. , 1980, Morphology and magnetic anomalies north of Iceland, J. , 47:67. Vogt, P. , Perry, R. , Feden, R. , Fleming, H. , and Cherkis, N. , 198lb, The Greenland-Norwegian Sea and Iceland environment: geology and geophysics, in: "The ocean basins and margins, vol.