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Mixed local and ultra-distal volcanic ash deposition within the Upper Cretaceous Kanguk Formation, Sverdrup Basin, Canadian Arctic Islands

Published online by Cambridge University Press:  18 June 2019

Michael A Pointon Open the ORCID record for Michael A Pointon [Opens in a new window] ,
Michael J Flowerdew Open the ORCID record for Michael J Flowerdew [Opens in a new window] ,
Peter Hülse Open the ORCID record for Peter Hülse [Opens in a new window] ,
Simon Schneider Open the ORCID record for Simon Schneider [Opens in a new window]  and
Martin J Whitehouse Open the ORCID record for Martin J Whitehouse [Opens in a new window]
Michael A Pointon*
Affiliation:
CASP, West Building, Madingley Rise, Madingley Road, Cambridge, CB3 0UD, United Kingdom
Michael J Flowerdew
Affiliation:
CASP, West Building, Madingley Rise, Madingley Road, Cambridge, CB3 0UD, United Kingdom
Peter Hülse
Affiliation:
CASP, West Building, Madingley Rise, Madingley Road, Cambridge, CB3 0UD, United Kingdom
Simon Schneider
Affiliation:
CASP, West Building, Madingley Rise, Madingley Road, Cambridge, CB3 0UD, United Kingdom
Martin J Whitehouse
Affiliation:
Department of Geosciences, Swedish Museum of Natural History, SE-104 05 Stockholm, Sweden
*
Author for correspondence: Michael A Pointon, Email: [email protected]
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Abstract

The Upper Cretaceous Kanguk Formation of the Sverdrup Basin, Canadian Arctic Islands, contains numerous diagenetically altered volcanic ash layers (bentonites). Eleven bentonites were sampled from an outcrop section on Ellesmere Island for U–Pb zircon secondary ion mass spectrometry dating and whole-rock geochemical analysis. Two distinct types of bentonite are identified from the geochemical data. Relatively thick (0.1 to 5 m) peralkaline rhyolitic to trachytic bentonites erupted in an intraplate tectonic setting. These occur throughout the upper Turonian to lower Campanian (c. 92–83 Ma) outcrop section and are likely associated with the alkaline phase of the High Arctic Large Igneous Province. Two thinner (<5 cm) subalkaline dacitic to rhyolitic bentonites of late Turonian to early Coniacian age (c. 90–88 Ma) are also identified. The geochemistry of these bentonites is consistent with derivation from volcanoes within an active continental margin tectonic setting. The lack of nearby potential sources of subalkaline magmatism, together with the thinner bed thickness of the subalkaline bentonites and the small size of zircon phenocrysts therein (typically 50–80 μm in length) are consistent with a more distal source area. The zircon U–Pb age and whole-rock geochemistry of these two subalkaline bentonites correlate with an interval of intense volcanism in the Okhotsk–Chukotka Volcanic Belt, Russia. It is proposed that during late Turonian to early Coniacian times intense volcanism within the Okhotsk–Chukotka Volcanic Belt resulted in widespread volcanic ash dispersal across Arctic Alaska and Canada, reaching as far east as the Sverdrup Basin, more than 3000 km away.

Keywords

bentonitetrace elementgeochemistryHigh Arctic Large Igneous ProvincegeochronologyOkhotsk–Chukotka Volcanic BeltU–Pb secondary ion mass spectrometry dating
Type
Original Article
Information
Geological Magazine , Volume 156 , Issue 12 , December 2019 , pp. 2067 - 2084
Copyright
© Cambridge University Press 2019 

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