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Conodonts recovered from the carbonate xenoliths in the kimberlites confirm the Paleozoic cover on the Hall Peninsula, Nunavut.
- Source :
-
Canadian Journal of Earth Sciences . Feb2014, Vol. 51 Issue 2, p142-155. 14p. - Publication Year :
- 2014
-
Abstract
- Hall Peninsula, located on southeastern Baffin Island, Nunavut, hosts the newly discovered Chidliak kimberlite province. Presently, this area lacks Phanerozoic sedimentary cover, except for the unconsolidated glacial deposits; however, Late Ordovician and Early Silurian microfossil conodonts have been recovered from carbonate xenoliths preserved in the Late Jurassic - Early Cretaceous kimberlites. Over 1300 conodont specimens were recovered, among which 32 species representing 23 genera are recognized, with four elements indeterminate. The well-preserved conodont faunas provide reliable evidence on the Hall Peninsula for ( i) reconstructing the Lower Paleozoic stratigraphic units, including the Upper Ordovician Frobisher Bay, Amadjuak, Akpatok, and Foster Bay formations, and the Lower Silurian Severn River Formation, ( ii) estimating a total of 270-305 m in thickness of Lower Paleozoic sedimentary cover prior to the emplacement of the kimberlites, ( iii) tracing the erosion history after the emplacement of the kimberlites, and ( iv) calculating a minimum erosion rate of 2 m/Ma. The conodonts have a wide range of conodont Color Alteration Index (CAI) values between 1.5 and 8, which is the largest range recorded in any known suite of xenoliths entrained in kimberlites. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CONODONTS
*FOSSIL microorganisms
*INCLUSIONS in igneous rocks
*FOSSILS
Subjects
Details
- Language :
- English
- ISSN :
- 00084077
- Volume :
- 51
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Canadian Journal of Earth Sciences
- Publication Type :
- Academic Journal
- Accession number :
- 94494027
- Full Text :
- https://doi.org/10.1139/cjes-2013-0171