A strain study of the Strathan Conglomerate, North Sutherland

Autor:	J. R. Mendum
Rok vydání:	1976
Předmět:	Lineation Strain (chemistry) Finite strain theory Red sandstone Mineralogy Metamorphism Geology Geometry Deformation (engineering) Quartz Conglomerate
Zdroj:	Scottish Journal of Geology. 12:135-146
ISSN:	2041-4951 0036-9276
Popis:	Synopsis The Strathan Conglomerate lies in the Lower Moinian of Sutherland and has been strongly deformed by two events, f 1 and f 2 . Minimum finite strain values X:Y:Z, calculated from deformed pebbles, range from 51:44.5:1 to 32:25:1 respectively. The size, shape and composition of the pebbles is compared to the nearby undeformed Watch Hill Conglomerate of Old Red Sandstone age. A simple method for estimating the minimum finite strain is outlined. The f 2 deformation has resulted in folding of the pre-existing flattened pebbles in some areas. During this folding and accompanying lower amphibolite grade metamorphism (M 2 ) quartz migration to low stress areas has occurred, resulting in a strong f 2 lineation and quartz rodding, both parallel to the X axis of the f 2 strain ellipsoid. On Ben Hutig a similar event has occurred; pre-f 2 planar quartz veins form a series of rods when folded by f 2 folds. The consequences of these results are discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8c40a7c5892075e6ecd334346d7bdfc0 https://doi.org/10.1144/sjg12020135 Zobrazit plný text záznamu