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TitleClumped isotope geothermometry of an Ordovician carbonate mound, Hudson Bay Basin
Associated Data
AuthorJautzy, J JORCID logo; Savard, M MORCID logo; Lavoie, DORCID logo; Ardakani, O HORCID logo; Dhillon, R S; Defliese, W F; Castagner, A
SourceJournal of the Geological Society vol. 178, issue 1, jgs2020-102, 2020 p. 1-11,
Alt SeriesNatural Resources Canada, Contribution Series 20200066
PublisherThe Geological Society of London
Mediapaper; on-line; digital
File formatpdf; html
ProvinceOntario; Nunavut; Manitoba
NTS25N; 32M; 33E; 33L; 33M; 33N; 34C; 34F; 34K; 34L; 34M; 34N; 35C; 35D; 35E; 35F; 35K; 35M; 35N; 42I; 42J; 42K; 42L; 42M; 42N; 42O; 42P; 43; 53H; 53I; 53J; 53K; 53N; 53O; 53P; 54A; 54B; 54C; 54F; 54K
AreaHudson Bay; James Bay; Hudson Strait; Foxe Basin
Lat/Long WENS -96.0000 -63.0000 66.0000 48.0000
Subjectssedimentology; geochemistry; Science and Technology; Nature and Environment; petroleum resources; petroleum exploration; hydrocarbon potential; hydrocarbons; oil; gas; petroleum occurrence; sedimentary basins; thermal history; burial history; geothermometry; isotopic studies; bedrock geology; lithology; sedimentary rocks; carbonate mounds; fluid inclusions; thermal maturation; oil slicks; exploration wells; calcite; temperature; Hudson Bay Basin; Methodology; Phanerozoic; Paleozoic; Ordovician
Illustrationslocation maps; geoscientific sketch maps; stratigraphic columns; photomicrographs; tables; plots; models
ProgramGEM2: Geo-mapping for Energy and Minerals Hudson/Ungava Region
Released2020 10 08
AbstractThe Hudson Bay sedimentary basin was overlooked geologically until two decades ago. Recent efforts to understand the palaeogeothermal history of this basin have led to the evaluation of fluid inclusion microthermometry, apatite fission track, organic matter reflectance and Rock-Eval analyses. Although apatite fission track and organic maturity indicators tend to show relatively low maximum burial temperatures (60-80°C), evidence of potential oil slicks on the sea surface and oil and gas shows in offshore wells have been reported across Hudson Bay. Fluid inclusion microthermometry in a carbonate mound sequence suggests homogenization temperatures of 118 ± 25 and 93 ± 10°C for recrystallized synsedimentary marine calcite and late pore-filling burial calcite, respectively. This sequence provides an interesting geological framework to test the application of clumped isotope thermometry against independent geothermometers. Here, we present clumped isotope data acquired on the late calcite cements and diagenetically altered early marine phases. The integration of clumped isotopic data with other thermal indicators allows the reconstruction and refinement of the thermal-diagenetic history of these carbonates by confirming an episode of heating, probably of hydrothermal origin and prior to normal burial diagenesis, that reset both fluid inclusions and the clumped isotope indicators without recrystallization.
Summary(Plain Language Summary, not published)
In this contribution, we present data from a new geothermometer (i.e. measurement of clumped isotope) obtained in different carbonate phases of a reef dating from about 450 Ma in the Hudson Bay sedimentary basin. These new data, compared to those of more conventional geothermometers, allow us to reconstruct the burial and heating history of this reef. For example, the comparison of the "clumped isotope" geothermometer with the fluid inclusion geothermometer allowed us to determine the existence of a short heating event probably due to hydrothermal activity at the very beginning of the reef's burial history. These data provide new information for the study of hydrocarbon generation in the Hudson Bay sedimentary basin.

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