Tectonically dewatered slates in the Ludlovian of the Lake District, England
作者:
C. Mca. Powell,
期刊:
Geological Journal
(WILEY Available online 1972)
卷期:
Volume 8,
issue 1
页码: 95-110
ISSN:0072-1050
年代: 1972
DOI:10.1002/gj.3350080109
出版商: John Wiley&Sons Ltd
数据来源: WILEY
摘要:
AbstractMultiple siltstone dykes intruded parallel to cleavage in the Ludlovian argillites and graywackes of the Lake District throw new light on the origin of slaty cleavage. Pore pressures equalling lithostatic pressure developed during the Caledonian orogeny and caused tectonic dewatering of the partially lithified sediments. Slaty cleavage was initiated as an essentially planar structure by the intrusion of thin pelitic folia during the escape of the pore water. Cleavage folia and fold axial planes may have a common geometric relationship to the deforming stresses, but are independent of each other in origin. Continued deformation after tectonic dewatering refracted the cleavage by rotation of competent layers. Critical examination of evidence supporting traditional theories of slaty‐cleavage formation shows that all observed relationships are compatible with the tectonic‐dewatering the
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