Zobrazeno 1 - 10
of 22
pro vyhledávání: '"K. M. Storetvedt"'
Publikováno v:
Geologische Rundschau. 87:658-674
A palaeomagnetic study of the 100 to 90 m.y. old alkaline igneous rocks of the French Pyrenees has in part revealed large between-site scatter caused by highly variable declination. Magnetomineralogical evidence suggests that the original titano-magn
Publikováno v:
Scottish Journal of Geology. 29:55-68
Synopsis Previous studies of the Lower Devonian lavas of the Cheviot Hills have shown them to contain an unusually complex remanent magnetization, and many lavas have given Carboniferous K-Ar ages which are not compatible with the geological evidence
Publikováno v:
Journal of African Earth Sciences (and the Middle East). 15:237-249
Palaeomagnetic and whole rock K-Ar data are reported from dolerite dykes from the east coast of Madagascar. The radiometric dates indicate that the dykes were injected 94.5 ± 1.2 Ma ago, during the earliest phase of Cretaceous magmatism on the islan
Publikováno v:
Geophysical Journal International. 102:151-163
SUMMARY The Foyers Sandstone, a constituent of the Old Red Sandstone of northern Scotland, located on the eastern flank of the Great Glen Fault, has yielded a multicomponent palaeomagnetic structure. The principal magnetization (called the B componen
On the British Siluro-Devonian palaeomagnetic field problem: reply to comments by T. H. Torsviket al
Publikováno v:
Geophysical Journal International. 105:475-476
We appreciate this opportunity to clarify our position on a few central issues of this debate. By our rejection of a number of Palaeozoic palaeomagnetic data from Scotland (Storetvedt et al. 1990), Torsvik et al. accuse us of disregarding all classic
Publikováno v:
Geophysical Journal International. 88:241-263
Summary Palaeomagnetic results and K–Ar age data for the Sintra and Sines intrusive complexes (W. Portugal), and further details on the palaeomagnetic structure of the Lisbon volcanics are reported. The Sintra complex consists of two main intrusive
Autor:
K. M. Storetvedt, E. R. Deutsch
Publikováno v:
Geophysical Journal International. 87:1193-1206
Summary. Critical re-evaluation of Scottish Ordovician palaeomagnetism comprising data from the NW Scotland syenites, the Aberdeenshire gabbros, and the pre-tectonic (i.e. pre late Ordovician-Silurian) magnetic overprinting of Dalradian tillites, app
Autor:
K. M. Storetvedt
Publikováno v:
Geological Magazine. 111:23-30
SummaryComparison of Old Red Sandstone palaeomagnetism for NW Scotland and Norway lead to the hypothesis of a 200–300 km sinistral movement along the Great Glen Fault. The displacement is thought to be of late Caledonian (late Devonian) age. The ne
Autor:
K. M. Storetvedt, C. M. Carmichael
Publikováno v:
Geophysical Journal International. 58:769-784
Summary. The John O'Groats Sandstone, on the north-east tip of Scotland, is the uppermost unit of a thick Old Red Sandstone sequence from the uppermost Middle Devonian. Samples from 13 sites have been treated by thermal and acid leaching techniques m
Autor:
K. M. Storetvedt, Reidar Løvlie
Publikováno v:
Geophysical Journal International. 73:197-212
Summary. The remanent magnetization of intrusive/extrusive rocks of the ‘basement’ complex of East Maio constitutes four components that define two different axes of magnetization, at around dec. 328, inc. 12 and dec. 007, inc. 14 respectively. I