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Stratal architecture and evolution of a slope mass-transport complex, Isaac Formation, Neoproterozoic Windermere Supergroup, southern Canadian Cordillera, British Columbia, Canada

Lilian Navarro and R. William C. Arnott
Stratal architecture and evolution of a slope mass-transport complex, Isaac Formation, Neoproterozoic Windermere Supergroup, southern Canadian Cordillera, British Columbia, Canada (in Subaqueous mass movements and their consequences; assessing geohazards, environmental implications and economic significance of subaqueous landslides, D. G. Lintern (editor), David C. Mosher (editor), L. G. Moscardelli (editor), P. T. Bobrowsky (editor), C. Campbell (editor), J. D. Chaytor (editor), J. J. Clague (editor), A. Georgiopoulou (editor), Patrick Lajeunesse (editor), Alexandre Normandeau (editor), David J. W. Piper (editor), M. Scherwath (editor), C. Stacey (editor) and D. Turmel (editor))
Special Publication - Geological Society of London (May 2018) 477 (1): 265-276

Abstract

Detailed sedimentological and stratigraphic analyses of a c. 1500 m thick, siliciclastic-dominated slope succession in the Neoproterozoic Isaac Formation at the Castle Creek study area (southern Canadian Cordillera) reveals the occurrence of four well-preserved mass-transport complexes (MTCs) composed principally of slide/slump and debris-flow deposits. The stratigraphically lowest of these complexes is about 60 m thick and crops out for >2.5 km laterally, consisting of slide and debrite. The slide has an irregular erosive base with ramp-and-flat geometry. This is overlain locally by boulder-sized blocks of slightly to moderately deformed strata, bounded by shear surfaces. The slide is overlain by a debrite that pinches and swells laterally, consisting of matrix-supported conglomerate with common metre-scale clasts of mudstone and coarse-grained sandstone embedded in a mudstone-rich matrix with dispersed, pebble quartz grains. Based on its stratigraphic position at the base of the slope, vertical stacking of slide-debrite, lithological distribution, considerable thickness and lateral extent, this MTC is interpreted to be associated with a major episode of continental slope instability and submarine mass-wasting. The close association between the MTC and underlying/overlying mixed carbonate-siliciclastic strata suggests that sea level most likely exerted a key control on sediment supply, which ultimately led to the emplacement of this MTC.


ISSN: 0305-8719
Coden: GSLSBW
Serial Title: Special Publication - Geological Society of London
Serial Volume: 477
Serial Issue: 1
Title: Stratal architecture and evolution of a slope mass-transport complex, Isaac Formation, Neoproterozoic Windermere Supergroup, southern Canadian Cordillera, British Columbia, Canada
Title: Subaqueous mass movements and their consequences; assessing geohazards, environmental implications and economic significance of subaqueous landslides
Author(s): Navarro, LilianArnott, R. William C.
Author(s): Lintern, D. G.editor
Author(s): Mosher, David C.editor
Author(s): Moscardelli, L. G.editor
Author(s): Bobrowsky, P. T.editor
Author(s): Campbell, C.editor
Author(s): Chaytor, J. D.editor
Author(s): Clague, J. J.editor
Author(s): Georgiopoulou, A.editor
Author(s): Lajeunesse, Patrickeditor
Author(s): Normandeau, Alexandreeditor
Author(s): Piper, David J. W.editor
Author(s): Scherwath, M.editor
Author(s): Stacey, C.editor
Author(s): Turmel, D.editor
Affiliation: University of Ottawa, Department of Earth Sciences, Ottawa, ON, Canada
Pages: 265-276
Published: 20180503
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 50
Accession Number: 2018-052740
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., 1 table, sketch map
N49°00'00" - N60°00'00", W141°00'00" - W120°00'00"
Source Note: Online First
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201828
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