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Carbon-isotope stratigraphy of the SPICE event (Upper Cambrian) in eastern Laurentia: implications for global correlation and a potential reference section

Published online by Cambridge University Press:  30 October 2018

Karem Azmy
Karem Azmy*
Affiliation:
Department of Earth Sciences, Memorial University of Newfoundland, St John’s, NL A1B 3X5, Canada
*
Author for correspondence: Karem Azmy, Email: [email protected]
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Abstract

The δ13C profile from the lower interval of the Martin Point section in western Newfoundland (Canada) spans the Upper Cambrian (uppermost Franconian – lowermost Trempealeauan). The investigated interval (∼110 m) is a part of the Green Point Formation of the Cow Head Group and consists of the upper part of the Tucker Cove Member (topmost part of the Shallow Bay Formation) and the lowermost part of the Martin Point Member (bottom of the Green Point Formation). It is formed of rhythmites of marine carbonates alternating with shales and minor conglomeratic interbeds. Multiscreening petrographic and geochemical techniques have been utilized to evaluate the preservation of the investigated lime mudstones. The δ13C and δ18O values of the sampled micrites (−4.8 ‰ to +1.0 ‰ VPDB and −8.2 ‰ to −5.3 ‰ VPDB, respectively) have insignificant correlation (R2 = 0.01), as similarly do the δ13C values with their Sr counterparts (R2 = 0.07), which supports the preservation of at least near-primary δ13C signatures that can be utilized to construct a reliable high-resolution carbon-isotope profile for global correlations. The δ13C profile exhibits two main negative excursions: a lower excursion (∼4 ‰) that reaches its maximum at the bottom of the section and an upper narrow excursion (∼6 ‰) immediately above the boundary of the Tucker Cove/Martin Point members (Shallow Bay Formation – Green Point Formation boundary). The lower excursion may be correlated with the global SPICE event, whereas the upper excursion may match with a post-SPICE event that has been also recognized in profiles of equivalent sections on different palaeocontinents.

Keywords

Furongian (Late Cambrian)SPICE eventhigh-resolution δ13C chemostratigraphyLaurentiaMartin Point (NL, Canada)
Type
Original Article
Information
Geological Magazine , Volume 156 , Issue 8 , August 2019 , pp. 1311 - 1322
Copyright
© Cambridge University Press 2018 

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