| Title | Clumped isotope geothermometry of an Ordovician carbonate mound, Hudson Bay Basin |
| Associated Data | https://doi.org/10.26022/IEDA/111560 |
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| Author | Jautzy, J J ;
Savard, M M; Lavoie, D; Ardakani, O H; Dhillon, R S; Defliese, W F; Castagner, A |
| Source | Journal of the Geological Society vol. 178, issue 1, jgs2020-102, 2020 p. 1-11, https://doi.org/10.1144/jgs2020-102 |
| Image |  |
| Year | 2020 |
| Alt Series | Natural Resources Canada, Contribution Series 20200066 |
| Publisher | The Geological Society of London |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf; html |
| Province | Ontario; Nunavut; Manitoba |
| NTS | 25N; 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 |
| Area | Hudson Bay; James Bay; Hudson Strait; Foxe Basin |
| Lat/Long WENS | -96.0000 -63.0000 66.0000 48.0000 |
| Subjects | sedimentology; 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 |
| Illustrations | location maps; geoscientific sketch maps; stratigraphic columns; photomicrographs; tables; plots; models |
| Program | GEM2: Geo-mapping for Energy and Minerals Hudson/Ungava Region |
| Released | 2020 10 08 |
| Abstract | The 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. |
| GEOSCAN ID | 326122 |
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