The Geikie igneous centre, west of Lewis: its structure and influence on Tertiary geologyScottish Journal of Geology - Tập 25 Số 3 - Trang 339-352 - 1989
D. Evans, Douglas A. Abraham, K. Hitchen
Synopsis
The Geikie igneous centre is identified from a large positive gravity anomaly to the west of Lewis. The anomaly is satisfied by a simple two cylinder model with a maximum diameter of 26 km. The centre is covered by Palaeocene basalts which are domed and radially disposed around it. The centre occurs near the apex of a topographic bulge on the slo...... hiện toàn bộ
Garnet pyroxenite xenoliths and pyropic megacrysts in Scottish alkali basaltsScottish Journal of Geology - Tập 39 Số 2 - Trang 169-184 - 2003
B. G. J. Upton, Peder Aspen, R. W. Hinton
Synopsis
Pyropic garnet occurs within garnet pyroxenite xenoliths and as discrete crystals in Carboniferous–Permian alkali basaltic tuffs and hypabyssal intrusions. Eight localities are now known from the Midland Valley together with another in the NW Highlands. The xenoliths are inferred to have been derived from minor pyroxenitic intercalations in spine...... hiện toàn bộ
Torridonian alluvium and quicksandsScottish Journal of Geology - Tập 5 Số 4 - Trang 328-346 - 1969
Richard C. Selley
Synopsis
This paper provides new data on Torridonian alluvium on Raasay, confirming its braided origin and refining its environmental interpretation. Fining-upwards cycles appear to be absent. This may be an important criterion in distinguishing deposits of braided rivers from those due to meandering rivers. A quantitative study reveals a close correlatio...... hiện toàn bộ
Photographic evidence for slope-current activity, Hebrides Slope, NE Atlantic OceanScottish Journal of Geology - Tập 31 Số 2 - Trang 107-115 - 1995
John Howe, J.D. Humphery
Synopsis
Evidence from sea-bed photographs and current-meter data from the Hebrides Slope, indicates that there is a slope-current flowing northward along the bathymetric contours in water depths of 500–1100 m. Structures identified from photographs include: asymmetric linguoid ripples, scours, crag-and-tail structures and current-induced smo...... hiện toàn bộ
A local deep-water sediment failure on the NW slope of the UKScottish Journal of Geology - Tập 27 Số 2 - Trang 107-111 - 1991
P. Strachan, D. Evans
Synopsis
An example is described, from seismic evidence, of a local deep-water sediment failure on the slope to the west of the Isle of Lewis, an area which otherwise appears to be generally stable. The feature is about 4 km long in the downslope direction and lies above an escarpment at an approximate water depth of 1100 m. The loss of layering on the re...... hiện toàn bộ
Magmatism of the British Tertiary Volcanic ProvinceScottish Journal of Geology - Tập 18 Số 1 - Trang 49-107 - 1982
R. N. Thompson
Synopsis
This review concentrates on those aspects of research into the magmatism of the British Tertiary Volcanic Province (BTVP) which have seen rapid accumulation of data and changes of views during the last few years. There seems to be general agreement at present amongst those who have made detailed geochemical studies of the problem that the pervasi...... hiện toàn bộ