Lower-crustal intrusion on the North Atlantic continental margin

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doi: 10.1038/nature06687
Authors:White, R. S.; Smith, L. K.; Roberts, A. W.; Christie, P. A. F.; Kusznir, N. J.; Roberts, A. M.; Healy, D.; Spitzer, R.; Chappell, A.; Eccles, J. D.; Fletcher, R.; Hurst, N.; Lunnon, Z.; Parkin, C. J.; Tymms, V. J.
Author Affiliations:Primary:
University of Cambridge, Bullard Laboratories, Cambridge, United Kingdom
Schlumberger Cambridge Research, United Kingdom
University of Liverpool, United Kingdom
Badley Technology, United Kingdom
Corporate Authors:Integrated Seismic Imaging & Modelling of Margins Project (iSIMM) Team
Volume Title:Nature (London)
Source:Nature (London), 452(7186), p.460-464. Publisher: Macmillan Journals, London, United Kingdom. ISSN: 0028-0836
Publication Date:2008
Note:In English. 30 refs.; illus., incl. sects., sketch map
Summary:Results are summarized from two iSIMM (integrated Seismic Imaging and Modelling of Margins) transects that imaged the seismic reflectivity and seismic velocity structure of the continent-ocean transition, Faroe and Hatton Bank volcanic margins, North Atlantic (location map across the North Atlantic rifted margins, seismic velocity profiles across the transects and plots of crustal velocities and thicknesses). The results indicate 360 to 400 km3/km of basalts extruded along strike and 540 to 600 km3 of basalt intruded into the continent-ocean transition forming sills transgressing the continental crustal structures. The continental fabric dips > 10° seaward, while the intersecting sills have variable dips mainly within 5° of the horizontal consistent with lopolithic structures. The onset of mature seafloor spreading is marked by linear magnetic anomalies coinciding with the end of seaward-dipping reflector sequences and submarine rather than subaerial volcanism. The ocean crust is interpreted as consisting entirely of igneous rocks with restricted lateral flow, in contrast to the large distances over which subaerial basalts flowed from the continent-ocean transition rift. [R.K.H.]
Subsections:Igneous petrology
Subjects:Anomalies; Continental crust; Continental margin; Crust; Geophysical methods; Geophysical profiles; Geophysical surveys; Lower crust; Mantle; Mohorovicic discontinuity; Oceanic crust; Plate tectonics; Rifting; Seismic methods; Seismic profiles; Surveys; Tomography; Arctic region; Atlantic Ocean; Atlantic Ocean Islands; East Greenland; Faeroe Islands; Greenland; North Atlantic
Abstract Numbers:08M/1337
Record ID:2008088311
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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