none 10.1144/sjg11010037 Geological Society of London Geological Society of London 1881 40774662 94125 2024111903365700311 10.1144 2024-11-19T11:56:42Z 2010-01-14T19:29:39Z 8 Scottish Journal of Geology SJG 0036-9276 2041-4951 11 10 2009 05 1975 11 1 J. S. Buckley U.C.N.W. Marine Science Laboratories, Menai Bridge, Anglesey R. J. Bailey U.C.N.W. Marine Science Laboratories, Menai Bridge, Anglesey Synopsis A magnetic and seismic reflection survey of the Hebrides Terrace Seamount (56°28′N., 10°17′W.) is supplemented by gravity data obtained by the Ministry of Defence (Hydrographic Office). The Seamount has a guyot-like morphology, and is supposed to be a volcanic feature. Seismic reflection profiles suggest that it ante-dates a succession of sediments on the continental slope to which a tentative Eocene–Recentage is assigned; and there are indications that its flat summit may represent an erosional bevel coeval with a (?Palaeocene) phase of erosion of the adjacent continental shelf margin. The associated magnetic anomaly is complex and cannot be simply modelled, but its general character is consistent with the presence of basic igneous rocks emplaced during an epoch of reversed polarity. The gravity profile is consistent with a model invoking a deep-rooted cylindrical core of density 3.0 gm cm −3 , flanked by pyroclastics and sediments of density 2.4 gm cm −3 . Thus the assembled data tend to confirm that the Seamount is an early Cenozoic volcanic feature. 06 07 2022 05 1975 37 45 10.1144/sjg11010037 1 10.1144/crossmark-policy www.lyellcollection.org true 1974-05-29 1974-04-09 2022-06-07 https://doi.org/10.15223/policy-002 10.1144/sjg11010037 https://www.lyellcollection.org/doi/10.1144/sjg11010037 https://www.lyellcollection.org/doi/pdf/10.1144/sjg11010037 https://geoscienceworld.org/sjg/article-lookup?doi=10.1144/sjg11010037 10.1111/j.1365-246X.1964.tb06315.x BACON M. 1971. Total field magnetic anomaly due to a 3D input as square prisms. Report No. CP 11 Inst. geol. Sci. (Geophysical Division Marine Geophysics Unit). 10.1144/gsjgs.130.1.0055 BARRACLOUGH D. R. MALIN S. R. C. 1971. Synthesis of International Geomagnetic Reference Field values. Report No. 71/1 Inst. geol. Sci. 10.1130/0016-7606(1972)83[289:SAEOHG]2.0.CO;2 Proc. geol. Soc. Lond ROBERTS D. G. 87 1662 1970 Recent geophysical studies on the Rockall Plateau and adjacent areas ROBERTS D. G. 1970. Recent geophysical studies on the Rockall Plateau and adjacent areas. Proc. geol. Soc. Lond. 1662, 87–92. Deep Sea Res ROBERTS D. G. 353 18 1971 New geophysical evidence on the origins of the Rockall Plateau and Trough ROBERTS D. G. 1971. New geophysical evidence on the origins of the Rockall Plateau and Trough. Deep Sea Res. 18, 353–60. 10.1111/j.1365-246X.1971.tb01846.x 10.1111/j.1365-246X.1972.tb06092.x 10.1190/1.1438687 10.1111/j.1365-246X.1970.tb06744.x 10.1080/00288306.1970.10428208