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TitleLate Ordovician-early Silurian conodonts and their colour alteration index values from carbonate xenoliths in kimberlite CH-06 on Hall Peninsula, Baffin Island, Nunavut
AuthorZhang, S; Pell, J
SourceCanada-Nunavut Geoscience Office, Summary of Activities 2019, 2020 p. 1-10 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesNatural Resources Canada, Contribution Series 20190321
PublisherCanada-Nunavut Geoscience Office
Mediaon-line; digital
File formatpdf
AreaHall Peninsula; Baffin Island; Canada
Lat/Long WENS -68.0000 -64.0000 65.0000 63.0000
Subjectsgeochronology; tectonics; Science and Technology; sedimentology; paleontology; conodonts; kimberlites; xenoliths
Illustrationsstratigraphic charts; location maps; tables
ProgramCanada-Nunavut Geoscience Office, Funding Program
Released2020 05 28
AbstractHall Peninsula, located on southeastern Baffin Island, Nunavut, hosts the Chidliak kimberlite province. Precambrian rocks currently crop out at surface, but these were covered by Ordovician and Silurian sedimentary rocks during the Late Jurassic-Early Cretaceous. The carbonate xenoliths, and the numerous conodont microfossils within them, that were recovered from kimberlite drillcores have proved that all these sedimentary rocks were present at the time of kimberlite emplacement (157.0-139.1 Ma) and have been subsequently removed by erosion. This study is a continuation of the work carried out since 2013 on conodonts recovered from Hall Peninsula kimberlites and their colour alteration index. The results from 5 drillholes in kimberlite CH-06 are summarized in this paper. Of the 17 collected samples, 10 contain conodonts, from which about 230 identifiable conodont specimens, with conodont colour alteration index values ranging between 6 and 7, have been recovered. These provide additional data to help in understanding the kimberlite emplacement processes and cooling history. More importantly, four early Silurian conodont species were previously unknown from Hall Peninsula, two of which are Aeronian and Telychian in age; this provides new evidence for younger strata being present in the region.
Summary(Plain Language Summary, not published)
Kimberlites have been discovered on the Hall Peninsula, Baffin Island, Nunavut. All bed rocks on the peninsula are Precambrian, as the original Paleozoic cover has been removed by erosion. The earlier presence of Paleozoic carbonate rocks is indicated by the presence of carbonate xenoliths, many of which contain numerous conodont microfossils, in the kimberlites. This study is a continuation of work done on conodonts recovered from the Hall Peninsula kimberlites and their Colour Alteration Indices (CAI). This paper summarises the results from 5 drill holes in kimberlite CH-06. Of 17 samples, 10 contain conodonts, from which about 230 conodont specimens (CAI 6-7) were recovered. These provide additional data to understanding kimberlite emplacement processes and cooling history. More importantly, two newly discovered conodont species with an age of Aeronian and Telychian (early Silurian) provide new evidence for the younger strata to be present in the region than those previously confirmed.

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