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Wickham & Peters 1993

Wickham, S.M. and Peters, M.T. (1993). High Delta-C-13 Neoproterozoic Carbonate Rocks in Western North-America. Geology 21(2): 165-168.

C-13-rich marbles from the Neoproterozoic McCoy Creek Group having deltaC-13 values up to + 12 parts per thousand have been discovered at three separate localities in eastern Nevada and western Utah. Detailed isotopic profiles measured across individual amphibolite facies, metre-thick marble layers have extremely uniform C-13/C-12 ratios, which probably represent depositional values. Because individual carbonate horizons have distinctly different but abnormally high values of deltaC-13, the discovery permits the use of C-13/C-12 ratios for stratigraphic correlation within the generally nonfossiliferous Neoproterozoic sedimentary sequences of western North America, even where these rocks have been strongly metamorphosed. The anomalous values add to a growing array of data from western North America and elsewhere delineating a large and geographically widespread Neoproterozoic carbon isotope anomaly.

BACKGROUND DATA FILES

	Abstract

Keywords
upper proterozoic successions, east humboldt range, isotope geochemistry, nevada, mountains, metamorphism, diagenesis, evolution, marbles, oxygen

Journal
Geology
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Publisher
The Geological Society of America
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