GEOSCAN Search Results: Fastlink

GEOSCAN Menu


TitleDevonian to Carboniferous continental scale carbonate turnover in Western Laurentia (North America): Upwelling or climate cooling?
 
AuthorHedhli, M; Dewing, KORCID logo; Grasby, SORCID logo; Beauchamp, B; Meyer, R
SourceFacies vol. 68, 15, 2022 p. 1-31, https://doi.org/10.1007/s10347-022-00653-4 Open Access logo Open Access
Image
Year2022
Alt SeriesNatural Resources Canada, Contribution Series 20210695
PublisherSpringer
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceCanada; British Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut
NTS1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
AreaUnited States of America
Subjectsstratigraphy; carbonate; climate; Laurentia; Devonian; Carboniferous
Illustrationslocation maps; stratigraphic columns; tables; photographs; cross-sections
ProgramEnergy Geoscience Geothermal Energy
Released2022 07 25
AbstractThe Devonian to Carboniferous (DC) transition coincided with a green-to-ice house climatic shift, anoxia, disappearance of lower latitude carbonate banks, and turnover from warm-to-cool water carbonate factories. In western Laurentia, the switch to carbonate factories dominated by cool-water biota was contemporaneous with a tectonically driven palaeogeographic change. To investigate this depositional shift and infer the relative impact of climate vs tectonics, a continentalscale sedimentological and geochemical study was conducted on twelve stratigraphic sections of DC strata from western Canada to southern Nevada (USA). The spatial-temporal distribution of microfacies records the turnover from [i] a Famennian lime mud-rich, shallow warm-water carbonate ramp with low sedimentation rates, mesotrophic conditions and tabular geometry to [ii] Tournaisian to Visean lime mud-depleted and grainstone dominated cool-water carbonate ramp with anomalous high sedimentation rates, oligotrophic conditions and a pronounced slope. Positive excursions of d18Ocarb (+ 2 per mil V-PDB) and ?13Ccarb (+ 4 per mil V-PDB) of Lower Mississippian carbonates likely correspond to the first cooling peak of the Carboniferous-Permian icehouse climate, following carbon withdrawal during black shale deposition during the late Famennian and early Tournaisian. However, late Tournaisian return of photozoan elements and their persistence throughout the Visean suggests that warmer surface water existed, revealing a decoupling of the lower latitude ocean and the atmosphere. Shoaling of the thermocline was likely a result of cold-water upwelling along an open coast, as the Antler orogen no longer provided an oceanic obstruction to the west. This study shows that carbonate platforms are more susceptible to regional changes than global shifts.
Summary(Plain Language Summary, not published)
Studying the depositional environment of Paleozoic rocks of western Canada allow us to understand the characteristics of these rocks as potential reservoir for hot aquifer ( geothermal energy).
GEOSCAN ID329694

 
Date modified: