Contribution à l'étude de quelques paléosols du Nord de l'Écosse

Godard, Alain; Paquet, Hélène; Millot, Georges

doi:10.3406/sgeol.1961.1231

Cited by 5 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Published information on styles of alteration is limited but indicates that the saprolites are almost all of gruss type. Analysis of eleven weathering profiles from the N Highlands and Outer Hebrides showed generally low clay contents and clay mineralogies dominated by illite (Godard et al 1961). Halloysite dominates the limited clay fractions in weathered schists from the Gaick Forest (Hall & Mellor 1988).…”

Section: Deep Weatheringmentioning

confidence: 96%

“…More advanced alteration is rare. Early Tertiary inter-basaltic weathering in Morvern represents the early stages of bauxitisation (Bain et al 1980) and is matched elsewhere in the igneous province (Godard et al 1961). Highly kaolinitic alteration occurs within narrow structurally-controlled zones in Shetland (May & Phemister 1968).…”

Section: Deep Weatheringmentioning

confidence: 99%

“…Highly kaolinitic alteration occurs within narrow structurally-controlled zones in Shetland (May & Phemister 1968). Finally, the Cambrian limestones of the NW Highlands contain pockets of red clay silts, comprising mainly quartz, illite and kaolinite, which have been interpreted as terra rossa-like karst accumulations of Pliocene age (Godard et al 1961;Le Coeur 1984).…”

Section: Deep Weatheringmentioning

confidence: 99%

See 2 more Smart Citations

Pre-Quaternary landscape evolution in the Scottish Highlands

Hall

1991

Transactions of the Royal Society of Edinburgh: Earth Sciences

View full text Add to dashboard Cite

The development of the relief of the Scottish Highlands is traced over the last 400 Ma. Evidence from Late Palaeozoic and Mesozoic sediments and near-surface volcanic and igneous rocks shows that post-Devonian erosion of basement has been < 1–2 km and that the main morphotectonic units of the Highlands were already established by the end of the Palaeozoic. During the Mesozoic, the Highlands experienced several major erosional cycles, beginning with uplift, reactivation of relief and stripping of cover rocks, followed by progressive reduction of relief through etchplanation and culminating in extensive marine transgressions in the Late Triassic, Late Jurassic and Late Cretaceous. In the Early Tertiary major uplift affected the Highlands, with downwarping and block movements along basin margins, but levels of uplift and denudation around the Tertiary igneous centres cannot be extrapolated to other areas. Buchan and Caithness remained relatively stable and Mesozoic relief elements were maintained during gradual surface lowering. Earth movements of lesser magnitude continued episodically until at least the end of the Tertiary. After 50 Ma the Highland terrain evolved by dynamic etching, with deep weathering of varied geology under warm to temperate humid environments leading to a progressive differentiation of relief, with formation of basins, valleys, scarps and inselbergs often closely adjusted to lithostructural controls.

show abstract

Section: Deep Weatheringmentioning

confidence: 96%

Section: Deep Weatheringmentioning

confidence: 99%

Section: Deep Weatheringmentioning

confidence: 99%

See 1 more Smart Citation

Pre-Quaternary landscape evolution in the Scottish Highlands

Hall

1991

Transactions of the Royal Society of Edinburgh: Earth Sciences

View full text Add to dashboard Cite

show abstract

Niveaux intercalaires dans les strates de basalte des plateaux de l'archipel de kerguelen

et al. 1966

View full text Add to dashboard Cite

ZusammenfassungEs wurden rote den Basaltlagen der Kerguelen Hochebene regelm~iBig eingesdmltete Zonen geochemisch untersucht. Das Hauptergebnis dieser Studien ist die Kenntnis der geochemischen Evolution der verschiedenen chemischen'Elemente unter dem Einflul3 hydrothermaler T~itigkeit, wiihrend folgender Basaltextrusionen. Von den unveriinderten Basaltlagen kommend en'eicht diese Evolution ein Maximum an der roten, zwischenliegenden Zone, die eine glasige Struktur und Textur zeigt. Die Leichtigkeit, mit der Eisen-und Alum~inm-oxyde freiwerden, der petrographische Befund und die rein morphologischen Beziehungen zwischen der roten Lage und der folgenden Basaltlage erlanben es, die rote Lage als pyroklastische Lage oder Aschenlage zu bezeichnen, die reich an Glas ist und sich yon den angrenzenden Basalten unterscheidet.Mineralogische, chemische, pollenanalytische und mikromorphologische Untersuchungen widerlegen die Annahme, dab die RStung unter lateristis&en Bedingungen entstanden sei. AbstractWe studied with geochemistric methods red levels regularly inserted beetween basaltic layers of the Kerguelen Plateau. The main result of these observations is to show the geochemistrie evolution of the elements under the influence of the hydrothermal action, developed during the coming of the upper basalt flow. Coming from safe zones of basalts this evolution reaches a maximum in the intermediary layer, in union with the vitrous structure and its texture. Easiness of the liberation of iron and aluminittm oxyds, petrographic study and clean morphological relations of the red layer with the adjacent one allow to consider the red layer as a pyroclastic or ashic formation, rich in glass and distinct from the adjacent basalts.Chemical studies of pollens, mineralogical and micro-morphological analysis of this formation permit to exclude the hypothesis of a ferralitic action to explain the rubifaetion.

show abstract