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TitleDescriptions of Paleozoic cores and thin sections from the Gudrid H-55, Roberval K-92, Indian Harbour M-52, and Freydis B-87 wells, offshore Labrador (Newfoundland and Labrador)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorBingham-Koslowski, NORCID logo
SourceGeological Survey of Canada, Open File 8543, 2019, 142 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
File formatpdf
ProvinceNewfoundland and Labrador; Eastern offshore region; Northern offshore region
AreaLabrador Sea; Labrador
Lat/Long WENS -55.8833 -54.7000 54.9167 53.9333
Subjectsregional geology; sedimentology; paleontology; fossil fuels; continental margins; continental shelf; sedimentary basins; core samples; core descriptions; thin section microscopy; depositional environment; sedimentary structures; bedrock geology; lithology; sedimentary rocks; carbonate rocks; dolostones; limestones; sandstones; siltstones; mudstones; igneous rocks; mafic rocks; diagenesis; alteration; fossils; trace fossils; petroleum resources; hydrocarbon potential; petroleum occurrence; reservoir rocks; porosity; Labrador Margin; Hopedale Basin; Gudrid H-55 Well; Roberval K-92 Well; Indian Harbour M-52 Well; Freydis B-87 Well; Phanerozoic; Paleozoic
Illustrationstables; location maps; photographs; photomicrographs; charts
ProgramGEM2: Geo-mapping for Energy and Minerals Baffin Region Atlas
Released2019 02 06
AbstractThe Paleozoic of offshore Labrador has received minimal attention due to its limited geographic extent and the lack of reliable biostratigraphic data, preventing correlation of these strata on a regional to global scale. Paleozoic strata are encountered in seven wells in the Hopedale Basin, of which, only four wells have cores associated with the pre-Mesozoic interval (Gudrid H-55, Roberval K-92, Indian Harbour M-52, and Freydis B-87). Six cores from the four wells, along with their associated 43 thin sections, are described here in an attempt to document lithological similarities between the wells that might provide insight into the timing and depositional environments of these rocks. Five of the six cores are composed of carbonate rocks with compositions ranging from dolostone (Gudrid H-55, Roberval K-92), to limestone and dolostone (Indian Harbour M-52), to primarily limestone with minimal diagenetic alteration (Freydis B-87 Core #2). Fossil material is rare to absent in pervasively dolomitized cores. Small, taxonomically indeterminate fossil fragments are common in the cores from Indian Harbour M-52 and Freydis B-87, along with shell fragments, articulated bivalve and brachiopod shells, echinoderms (crinoids), gastropods, sponge spicules, bryozoans, dasycladacean green algae, trilobites, ostracods, and calcimicrobes (Girvanella). Core #1 from the Freydis B-87 well, the only siliciclastic Paleozoic core, is composed of sandstones, siltstones, and mudstones. Roberval K-92 Core #6 contains two, mafic igneous intervals and hydrocarbon-charged porosity is observed in both cores from this well. Correlation of these Paleozoic strata, although consistent with similarities in the quantity and nature of fossil content, must await rigorous biostratigraphic assessment.
Summary(Plain Language Summary, not published)
Paleozoic strata is penetrated by seven wells in the Hopedale Basin, offshore Labrador. Of these seven wells, only 4 of the wells (Gudrid H-55, Roberval K-92, Indian Harbour M-52, and Freydis B-87) contain core and thin sections associated with the Paleozoic interval. Well history summaries along with core and thin section descriptions are presented in an attempt to decipher whether the Paleozoic rocks in these wells are relatable. Detailed core descriptions, photographs of the cores as well as a photomicrograph plate for each thin section accompany summaries of lithological and paleontological observations made for each core.

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