EarthRef.org Reference Database (ERR) -- Brasier & Shields 2000

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Brasier & Shields 2000

Brasier, M.D. and Shields, G. (2000). Neoproterozoic chemostratigraphy and correlation of the Port Askaig glaciation, Dalradian Supergroup of Scotland. Journal of the Geological Society of London 157: 909-914.

The delta(13)C of preglacial carbonates beneath the glaciogenic Port Askaig Formation falls from +5 parts per thousand to negative values, while least-altered Sr-87/Sr-86 values are close to 0.7067. Postglacial 'cap carbonates' of the Bonahaven Formation begin with negative delta(13)C(carb) values, jumping sharply to +11.7 parts per thousand near the top, which we correlate with excursions above the Elbobreen-Wilsonbreen glaciations of Svalbard and putative Sturtian (not Varanger) glaciations elsewhere, dated at c. 720 Ma. Much of the succeeding Terminal Neoproterozoic is missing in NE Svalbard and East Greenland, raising doubts about their use for global Sr and C isotope curves in the Neoproterozoic.

BACKGROUND DATA FILES

	Abstract

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	Samples

Keywords
neoproterozoic, dalradian, glaciation, chemostratigraphy, early animal evolution, east greenland, sedimentation, calibration, diamictites, carbonate, isotopes, svalbard, earth

Journal
Journal of the Geological Society of London
http://www.geolsoc.org.uk/template.cfm?name=geopub_instr

Publisher
The Geological Society
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