EVIDENCE FOR LATE RIFTING OF THE CORDILLERAN MARGIN OUTLINED BY STRATIGRAPHIC DIVISION OF THE LOWER CAMBRIAN GOG GROUP, ROCKY-MOUNTAIN MAINRANGES, BRITISH-COLUMBIA AND ALBERTA

Citation
Wh. Lickorish et Ps. Simony, EVIDENCE FOR LATE RIFTING OF THE CORDILLERAN MARGIN OUTLINED BY STRATIGRAPHIC DIVISION OF THE LOWER CAMBRIAN GOG GROUP, ROCKY-MOUNTAIN MAINRANGES, BRITISH-COLUMBIA AND ALBERTA, Canadian journal of earth sciences, 32(7), 1995, pp. 860-874
Citations number
27
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary
Journal title
ISSN journal
0008-4077
Volume
32
Issue
7
Year of publication
1995
Pages
860 - 874
Database
ISI
SICI code
0008-4077(1995)32:7<860:EFLROT>2.0.ZU;2-3
Abstract
The Lower Cambrian McNaughton Formation of the Gog Group occupies a st ratigraphic position transitional between the rift-related rocks of th e underlying Upper Proterozoic Miette Group, and the overlying Paleozo ic passive margin succession. A major regional unconformity, overlain by a distinctive orthoquartzite marker, has been traced within the McN aughton Formation. This unconformity has been shown to truncate normal faults active during the deposition of the lower McNaughton Formation . The lower McNaughton Formation consists of mature, coarse-grained fl uvial sediments accumulated in hanging-wall half-grabens of active nor mal faults. These faults represent the final stage of rifting on the c ontinental margin. The unconformity on the footwall blocks of these fa ults can be traced into the hanging wall, and is overlain by the shore face sediments of the transgressive upper McNaughton Formation. Formal subdivision of the McNaughton Formation into four lithostratigraphic members is proposed, in order to describe this geometry.