Stratigraphy and sedimentology of the Pennsylvanian Grande Anse Formation, Cumberland Basin, eastern Canada: its relationship to salt tectonics and coeval strata of the Joggins World Heritage Site

2020 ◽  
pp. 1-16
Author(s):  
Fadel Bahr ◽  
Dave Keighley
Keyword(s):  
Sedimentary Basins ◽  
World Heritage ◽  
World Heritage Site ◽  
Salt Tectonics ◽  
The South ◽  
Eastern Canada ◽  
Black Point ◽  
The North ◽  
Grande Anse ◽  
Hydrological System

The Cumberland Basin is one of several sedimentary basins composing the late Paleozoic Maritimes Basin complex of eastern Canada. Pennsylvanian salt tectonics in the Cumberland Basin caused two salt mini-basins to evolve on either side of the Minudie Anticline, a salt wall. South of the wall (Athol Syncline), along the Joggins World Heritage shoreline, an ∼3000 m succession of strata (Little River, Joggins, Springhill Mines, and Ragged Reef formations) accumulated conformably on the Boss Point Formation. North of the wall (Black Point sub-basin), the biostratigraphically equivalent, but mostly unstudied, ∼600 m thick succession of Grande Anse Formation lies in angular unconformity on folded and faulted Boss Point and basal Little River formations. Grande Anse Formation sedimentology indicates four lithofacies associations: floodplain (LA1), braided channel (LA2), sheet flood (LA3), and debris flow deposits (LA4). One possible model has the Black Point sub-basin with its own hydrological system, completely separated from the Athol Syncline. A low subsidence rate combined with the low sedimentation rate produced the ∼600 m thick sand- and mud-prone succession that was contemporaneous with the ∼3 km succession to the south. The second model proposes that north of the salt wall was exposed to erosion during accumulation of Joggins and Springhill Mines formation strata to the south. Subsequently, the sediment of the lithologically similar Ragged Reef and Grande Anse formations either (i) onlapped to the north, unconformably on the folded Boss Point; or (ii) unconformably–disconformably on the underlying strata after a period of time indistinguishable in the biostratigraphic record.

Chemostratigraphy of Cumberland Group (Pennsylvanian) strata influenced by salt tectonics, Joggins Fossil Cliffs UNESCO World Heritage Site, eastern Canada

2021 ◽  
Vol 91 (9) ◽  
pp. 969-985
Author(s):  
Fadel Bahr ◽  
Dave Keighley
Keyword(s):  
Chemical Weathering ◽  
World Heritage ◽  
World Heritage Site ◽  
Salt Tectonics ◽  
Unesco World Heritage ◽  
Heritage Site ◽  
Unesco World Heritage Site ◽  
Icp Ms ◽  
Significant Difference ◽  
Grande Anse

ABSTRACT The Pennsylvanian stratigraphy of the western Cumberland Basin has been influenced by salt tectonics, specifically the formation of the Minudie Anticline, a salt wall. South of the Minudie Anticline, along the shoreline of the Joggins Fossil Cliffs UNESCO World Heritage Site, the post–Boss Point Formation succession comprises an ∼ 3 km succession of strata assigned to the Little River, Joggins, Springhill Mines, and Ragged Reef formations. North of the Minudie anticline, the Grande Anse Formation lies in angular unconformity on the Boss Point and basal Little River formations. Biostratigraphic studies have not been able to discern whether the Grande Anse Formation is equivalent to all, or just one, of the Joggins to Ragged Reef units south of the salt wall (the Minudie Anticline). To further investigate the relationship of the Grande Anse Formation with the units along the Joggins shoreline, forty sandstone samples from the post–Boss Point Fm strata were selected for a chemostratigraphic study, using inductively coupled plasma mass spectrometry (ICP-MS) to determine major-element compositions. Transformed ICP-MS data, subjected to a Kruskal-Wallis test and post-hoc tests, show that there is no significant difference between Grande Anse and Ragged Reef formations in the mean values of almost all analyzed elements. In contrast, there are significant differences when comparing these two units and the older Little River, Joggins, and Springhill Mines formations in the case of elements usually encountered in detrital mineral phases (Si, Al, Ti, Na, and Fe). Sandstones of the Grande Anse and Ragged Reef formations show greater compositional maturity than the Little River, Joggins, and Springhill Mines formations. This trend is explained by a gradual overall change in paleoclimate from semiarid conditions during deposition of the Little River Formation to humid conditions during deposition of the Grande Anse and Ragged Reef formations, causing greater chemical weathering of the sediment. These findings indicate that > 2 km of sediment (Little River, Joggins, and Springhill Mines formations) accumulated south of the salt wall during the major episode of salt diapirism, followed by erosion of any topographic high associated with the salt wall, and accumulation of a further > 500 m of sediment (the laterally equivalent Ragged Reef and Grand Anse formations), all within a timespan of only ∼ 2 Myr.

A checklist of marine algae of eastern Canada, second revision

1984 ◽  
Vol 62 (4) ◽  
pp. 680-704 ◽  
Author(s):  
G. Robin South
Keyword(s):  
New Brunswick ◽  
Marine Algae ◽  
The South ◽  
Eastern Canada ◽  
The North ◽  
Fucus Distichus ◽  
Anticosti Island

A revised checklist of 354 species, subspecies, and varieties of benthic marine algae from eastern Canada is given, consisting of 128 Rhodophyceae, 128 Phaeophyceae, 90 Chlorophyceae, 7 species of Vaucheria (Xanthophyceae), and 1 of Phaeosaccion (Chrysophyceae). Records for the entire coastline from Cape Chidley, Labrador, in the north to the New Brunswick – Maine border in the south are included, as well as from Anticosti Island, Magdalen Island, Sable Island, and St. Pierre and Miquelon. Additions include Waerniella lucifuga (Kuck.) Kylin; Phloeospora curta (Fosl.) Jaasund; Striaria attenuata (Grev.) Grev.; Fucus distichus L. subsp. anceps (Harv. et Ward ex Carm.) Powell (Phaeophyta); Pilinia ? rimosa Kütz.; and Tellamia contorta Batt. (Chlorophyta).

The Mud-Dwelling Hydrozoan Boreohydra simplex in the Western North Atlantic

1974 ◽  
Vol 31 (10) ◽  
pp. 1666-1667
Author(s):  
Dale R. Calder
Keyword(s):  
North Atlantic ◽  
South Atlantic ◽  
The South ◽  
Eastern Canada ◽  
South Georgia ◽  
The North ◽  
The North Atlantic

Boreohydra simplex was collected at a depth of 400 m in Cabot Strait, eastern Canada; this solitary, mud-dwelling hydroid is previously unreported from the western North Atlantic. Elsewhere, it has been found along the coasts of Scandinavia, Britain, and Iceland in the North Atlantic, and from South Georgia in the South Atlantic.

scholarly journals Geological structure and petroleum potential of the Kara Sea shelf

2019 ◽  
Vol 489 (3) ◽  
pp. 272-276
Author(s):  
V. A. Kontorovich ◽  
A. E. Kontorovich
Keyword(s):  
Oil And Gas ◽  
Sedimentary Basins ◽  
Geological Structure ◽  
Water Area ◽  
Kara Sea ◽  
Gas Content ◽  
Liquid Hydrocarbons ◽  
The South ◽  
Petroleum Potential ◽  
The North

On the Kara Sea shelf, there are two sedimentary basins separated by the North-Siberian sill. Tectonically the southern part of the Kara Sea covers the South Kara regional depression, which is the northern end of the West Siberian geosyncline. This part of the water area is identified as part of the South Kara oil and gas region, within which the Aptian-Albian-Senomanian sedimentary complex is of greatest interest in terms of gas content, in terms of liquid hydrocarbons - Neocomian and Jurassic deposits. The northern part of the Kara Sea is an independent North Kara province, for the most part of which the prospects of petroleum potential are associated with Paleozoic sedimentary complexes. Oil and gas perspective objects of this basin may be associated with anticlinal, non-structural traps and reef structures.

scholarly journals Possible New Solstitial Sightline in the Stonehenge Landscape

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Clive Ruggles ◽  
Amanda Chadburn ◽  
Matt Leivers ◽  
Andrew Smith
Keyword(s):  
World Heritage ◽  
World Heritage Site ◽  
Early Neolithic ◽  
The North ◽  
Heritage Site ◽  
The World ◽  
June Solstice ◽  
New Discovery ◽  
Neolithic Monuments

The landscape around Stonehenge contains a number of major Early Neolithic monuments dating to the fourth millennium BC, including the Stonehenge Cursus, the Lesser Cursus, Robin Hood’s Ball causewayed enclosure and several long barrows. A previously unsuspected Early Neolithic causewayed enclosure whose northeast rim was uncovered in 2016 on the slopes of Lark Hill, just to the north of the World Heritage Site boundary, represented a major new discovery. About a millennium after the construction of the Lark Hill Enclosure, a line of at least six timber posts was erected crossing from the interior to the exterior of the old enclosure, just to one side of a wide entrance. The line is slightly curved but the last three posts in the line face directly out towards the position of June solstice sunrise. While several short and longer rows of posts are now known to have been built in this vicinity both during the Later Neolithic and at later times, there are several reasons for believing this solstitial alignment to have been intentional and meaningful. It may even have represented the “monumentalisation” of an earlier broadly solstitial alignment of natural features, as has been suggested at Stonehenge itself.

Caledonian nappe geometry in north-central Sweden and basin evolution on the Baltoscandian margin

1989 ◽  
Vol 126 (5) ◽  
pp. 499-513 ◽  
Author(s):  
Rodney A. Gayer ◽  
Reinhard O. Greiling
Keyword(s):  
Cross Sections ◽  
Foreland Basin ◽  
Sedimentary Basins ◽  
The South ◽  
Apparent Lack ◽  
North Central ◽  
The North ◽  
Basin Development ◽  
Basement High ◽  
Sedimentary Fill

AbstractStructural analysis of the Lower Allochthon in the north-central Scandinavian Caledonides has allowed the construction of restorable cross-sections consistent with the development of a foreland-propagating linked thrust system. The internal geometry of an antiformal stack, the Njakafjäll duplex, within the Lower Allochthon demonstrates tectonic shortening of c. 50% and suggests an overall predeformational width for the Lower Allochthon in this area of at least c. 130 km, and possibly considerably greater if the buried trailing edge of the Lower Allochthon lies in a comparable position to that farther south in Tröndelag. These results, combined with a stratigraphic analysis of the imbricates within the Lower Allochthon and of the adjoining Autochthon and Middle Allochthon, indicate the development, from Proterozoic through Cambrian times, of two sedimentary basins on the c. 200 km wide continental margin of Baltica bordering the Iapetus Ocean. The basins were separated by a region of basement relief, the Børgefjell domain, above which a reduced sequence of Vendian to Cambrian rocks accumulated. This Børgefjell basement high, and the similar Njakafjäll basement high to the east, subsequently became the sites of antiformal stack development. It is argued that the frequent incorporation of basement into the thrust sheets, together with the thin sedimentary fill of these basins, compared with the much greater fill in basins to the south in Jämtland and to the north of Finnmark, implies major palaeogeographic changes along the Baltoscandian margin, possibly related to early rift geometries. The apparent lack of subsequent foreland basin development in north-central Scandinavia compared with areas to the south may indicate a deeper level of thrust detachment beneath the Middle Allochthon to the north, such that any foreland basin sediments have been removed in the hangingwall and subsequently eroded. An alternative possibility is a primary absence of foreland basin development that may relate to a differing response to thrust loading by continental lithosphere which had been variably thinned during the earlier rift regime.

Sign in / Sign up

Export Citation Format

Share Document