Cited by 256Paleontology and Stratigraphy of FossilsGeological and Geochemical AnalysisGeology and Paleoclimatology Research

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A composite reference section for terminal Proterozoic strata of southern Namibia

Saylor, Beverly Z., Kaufman, Alan J., Grotzinger, John P., Urban, Frank·1998·Journal of Sedimentary Research

DOI 10.2110/jsr.68.1223

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Abstract

Integrated sequence stratigraphic and chemostratigraphic data yield a framework for correlations of stratigraphic units in the terminal Proterozoic to Cambrian Witvlei and Nama Groups of Namibia. Coupled with precise U-Pb zircon age constraints, these correlations make it possible to construct a composite reference section for use in calibrating terminal Proterozoic chronostratigraphy. The Namibian reference section starts with two distinct glacial horizons and extends up to within 1 million years of the Proterozoic-Cambrian boundary. The two glacial horizons may represent each of two distinct Varanger-age glaciations better known from the North Atlantic region. From the higher of the two glacial horizons up, the composite stratigraphy preserves one of the thickest and most complete available records of carbon-isotope variability in post-Varanger terminal Proterozoic seawater. Four carbon-isotope chemostratigraphic intervals are recognized: (1) a postglacial negative delta 13C excursion (Npg interval); (2) a rising interval (Pr interval) of increasing positive delta 13C values; (3) a falling interval (Pf interval) characterized by decreasing positive delta 13C and culminating in near zero or negative values; and (4) an interval of moderately positive, relatively invariant delta 13C values (I interval) that extends up to the unconformity that contains the Proterozoic-Cambrian boundary. Each of these chemostratigraphic intervals can be recognized in widely separated correlative sections around the world. By comparing sediment accumulation rate in the radiometrically calibrated Namibian stratigraphy with sediment accumulation rates in correlative sections in Arctic Canada and Oman, a maximum age of 564 Ma is estimated for the end of the younger Varanger glaciation, 25 m.y. younger than previous estimates.

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Authors: Saylor, B. Z., Kaufman, A. J., Grotzinger, J. P., & Urban, F.
Affiliations: Massachusetts Institute of Technology (US)
ORCID: Saylor, Beverly Z.
Kaufman, Alan J.
Grotzinger, John P.
Venue: Journal of Sedimentary Research
Publisher: Society for Sedimentary Geology
Published: 1998-11-01
Volume: 68
Issue: 6
Pages: 1223-1235
ISSN: 0022-4472 (ISSN-L)
1938-3681
1527-1404
DOI: 10.2110/jsr.68.1223
OpenAlex: W2126802403
Cited by: 256
References: 35
Citations by year: 2026: 7 · 2025: 4 · 2024: 9 · 2023: 8 · 2022: 3 · 2021: 9 · 2020: 9 · 2019: 6 · 2018: 13 · 2017: 7 · 2016: 8 · 2015: 7 · 2014: 5 · 2013: 6 · 2012: 4
FWCI: 12.46
Type: journal article
Language: en
Open access: closed
Locations: Journal of Sedimentary Research (publishedVersion)
PubMed (publishedVersion)
CaltechAUTHORS (California Institute of Technology) (submittedVersion)
Topics: Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geological and Geochemical Analysis
Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
Keywords: Nama Group, carbon isotope stratigraphy, zircon U-Pb geochronology, chronostratigraphy, sediment accumulation rates, Namibia, Oman, Canadian Arctic
MeSH terms: Carbon Isotopes, Carbonates, Cold Climate, Fossils, Geology, Ice, Namibia, Seawater, Geologic Sediments, Evolution, Planetary, Geological Phenomena

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A composite reference section for terminal Proterozoic strata of southern Namibia

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