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TitleBlack shale xenolith in a Jurassic-Cretaceous kimberlite and organic-rich Upper Ordovician shale on Baffin Island, Canada: a comparison of their organic matter
AuthorJiang, CORCID logo; Zhang, S; Reyes, JORCID logo
SourceMarine and Petroleum Geology vol. 103, 2019 p. 202-215,
Alt SeriesNatural Resources Canada, Contribution Series 20180325
PublisherElsevier BV
Mediapaper; on-line; digital
File formatpdf; html
NTS25M; 26A; 26B; 26C
AreaBaffin Island; Hall Peninsula
Lat/Long WENS -70.0000 -65.0000 65.0000 63.7500
Subjectsfossil fuels; geochemistry; geochronology; petroleum resources; hydrocarbon potential; source rocks; bedrock geology; lithology; sedimentary rocks; black shales; shales; igneous rocks; intrusive rocks; kimberlites; xenoliths; organic geochemistry; pyrolysis; thermal maturation; petrographic analyses; core samples; depositional environment; macerals; bulk composition; isotopic studies; carbon isotopes; gas chromatography; mass spectrometer analysis; Lower Silurian; Upper Ordovician; Amadjuak Formation; Phanerozoic; Mesozoic; Cretaceous; Jurassic; Paleozoic; Silurian; Ordovician
Illustrationslocation maps; geoscientific sketch maps; photographs; tables; plots; chromatograms; ternary diagrams; photomicrographs
ProgramCanada-Nunavut Geoscience Office, Funding Program
Released2019 02 27
AbstractRock-Eval pyrolysis and molecular organic geochemical analyses as well as organic petrographic observations were carried out on a rare black shale xenolith core drilled from a Late Jurassic-Early Cretaceous kimberlite on the Hall Peninsula in southern Baffin Island, Canada. The results are compared with those of outcrop shale samples from the Upper Ordovician Amadjuak Formation, the only organic-rich shale deposit discovered so far in the region. The shale xenolith is found to be organic-rich and thermally mature at the stage of peak oil generation, and contain type II organic matter similar to that of the immature Amadjuak shale. Discounting the differing thermal maturation effect, similar depositional environments and original organic inputs are suggested for both the shale xenolith and the Upper Ordovician shale based on their bulk, molecular and isotopic signatures as well as organic maceral assemblages. The present study cannot exclude the possibility of the shale xenolith being originated from an organic-rich Lower Silurian deposit, as suggested by previous Re-Os isotope dating study. It is clear, however, that depending on their areal distribution and thickness, the lithostratigraphic unit from which the organic-rich black shale xenolith is derived would make an excellent petroleum source rock in the study area.
Summary(Plain Language Summary, not published)
Rock-Eval pyrolysis and molecular organic geochemical analyses were carried out on a black shale xenolith core from a Jurassic-Cretaceous aged kimberlite on the Hall Peninsula of southern Baffin Island, Canada. The results are compared with those of organic-rich Upper Ordovician shale outcrops from the same region. The shale xenolith was found to have been deposited in similar depositional environment to the Upper Ordovician shale. However, the shale xenolith is thermally more mature than the Ordovician shale outcrop, and is at peak oil generation whereas the outcrop shale is immature.

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