Structural Geometry of Dalradian Rocks at Loch Leven, Scottish Highlands

Autor:	D. B. McIntyre, L. E. Weiss
Rok vydání:	1957
Předmět:	Dalradian Lineation Metamorphic rock Schist Geology Statistical analysis Fold (geology) Structural geometry Petrology Geomorphology
Zdroj:	The Journal of Geology. 65:575-602
ISSN:	1537-5269 0022-1376
DOI:	10.1086/626465
Popis:	The structural geometry of Dalradian metamorphic rocks in the west Highlands of Scotland is investigated by graphical statistical analysis of the preferred orientation of structural elements such as foliations, lineations, and fold axes. The investigation reveals the presence of large recumbent folds with axes plunging to the northwest, on which are superposed folds of different type with variable plunge and subvertical axial surfaces striking dominantly northeast. It is suggested that the recumbent folds are the earliest structures and were formed by the gliding of sheets of quartzite and schist on a gently dipping surface, possibly under the influence of gravity. The folds with steeply dipping axial surfaces are thought to have been superposed on the recumbent folds by a subhorizontaj squeezing without large-scale translation. Some general aspects of the geometry of superposed folds are briefly discussed.
Databáze:	OpenAIRE
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