Upper Pennsylvanian sediment dispersal and paleochannel orientation in the western part of the Sydney Coalfield, Cape Breton, Nova Scotia

Duff, P. McL. D.; Forgeron, S.; Poll, H. W. van de

doi:10.4138/1389

Cited by 4 publications

(1 citation statement)

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“…2). As palaeoflow direction for all three formations was northerly to northeasterly (Dilles, 1983;Duff et a/., 1982;Giles, 1983;, the WCF cannot be considered a proximal or distal equivalent of the other formations, and may have formed a relatively elevated part of the Morien alluvial plain with a persistently low groundwater level.…”

Section: Regional Settingmentioning

confidence: 99%

Ribbon sandstones in the Pennsylvanian Waddens Cove Formation, Sydney Basin, Atlantic Canada: the influence of siliceous duricrusts on channel‐body geometry

Gibling

Rust

1990

Sedimentology

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Channelized bodies up to 9 m thick in the Pennsylvanian Waddens Cove Formation show low width: thickness ratios (8:1 to 14:1), up to four vertically stacked storeys, and deep incision into associated floodplain strata. The presence of lateral accretion sets up to 6 m thick indicates that the migration of bank‐attached bars was a major channel‐filling process. The progressive rise in elevation of the basal part of the accretion surfaces where the sets adjoin the steeply inclined sides of the channel bodies shows that the channel floor aggraded progressively as the bars approached the channel sides. In planform, the river system probably showed a low‐sinuosity, incised valley within which the channel followed a more sinuous and partially confined course. The alluvium surrounding the channel bodies includes sandstone sheets attributed to crevasse splay and levee accumulation. The upper strata of many sheet's and some channel bodies contain siliceous duricrusts (ganisters) which formed by pedogenic lithification of sandy material commencing shortly after the landforms became inactive. The channel bodies contain duricrust‐bearing slumpblocks and show stepped margins over duricrusts. The stepped nature of the banks suggests that duricrusts were an important factor in confining the reach, and we suggest that channel‐body geometry was influenced, although not necessarily controlled, by the presence of the lithified layers. Alternation in the Waddens Cove Formation of grey, coal‐bearing zones with red, duricrust‐rich zones is attributed to water‐table fluctuation in response to base‐level changes. The low width: thickness ratios and aggradation mode'of the channel bodies may in part reflect channel incision and subsequent aggradation resulting from these allocyclic events.

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Section: Regional Settingmentioning

confidence: 99%

Ribbon sandstones in the Pennsylvanian Waddens Cove Formation, Sydney Basin, Atlantic Canada: the influence of siliceous duricrusts on channel‐body geometry

Gibling

Rust

1990

Sedimentology

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Some geochemical aspects of sedimentary rocks in proximity of coals, sydney coalfield (upper carboniferous), cape breton island, nova scotia, canada

Zodrow¹

1983

International Journal of Coal Geology

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A sedimentological overview of the coal-bearing Morien Group (Pennsylvanian), Sydney Basin, Nova Scotia, Canada

Rust¹,

Gibling²,

Best³

et al. 1987

Can. J. Earth Sci.

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The onshore part of the Sydney Basin, Nova Scotia, contains a 2 km fining-upward coal-bearing succession, the Pennsylvanian Morien Group. Facies analysis indicates an upward change in depositional environment from mid- through distal braid-plain to meandering fluvial plain. This change occurred earliest in the southeast part of the basin, where the meandering channels were incised through penecontemporaneous duricrusts. Northeastward drainage was maintained throughout, and the basin fill records gradually decreasing slopes as source relief was worn down and rate of subsidence declined during a period of increasing tectonic quiescence. The uneconomic coals of the lower Morien Group (South Bar and Waddens Cove formations) are thin and inextensive and formed in well-drained swamps of anabranches from the active braided system or between incised meandering channels. The economic coals of the upper Morien (Sydney Mines Formation) are more extensive and formed in broad, humid swamps of large flood basins between the unconfined channels of large meandering rivers.

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Upper Pennsylvanian sediment dispersal and paleochannel orientation in the western part of the Sydney Coalfield, Cape Breton, Nova Scotia

Cited by 4 publications

References 0 publications

Ribbon sandstones in the Pennsylvanian Waddens Cove Formation, Sydney Basin, Atlantic Canada: the influence of siliceous duricrusts on channel‐body geometry

Ribbon sandstones in the Pennsylvanian Waddens Cove Formation, Sydney Basin, Atlantic Canada: the influence of siliceous duricrusts on channel‐body geometry

Some geochemical aspects of sedimentary rocks in proximity of coals, sydney coalfield (upper carboniferous), cape breton island, nova scotia, canada

A sedimentological overview of the coal-bearing Morien Group (Pennsylvanian), Sydney Basin, Nova Scotia, Canada

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