Integrated chronostratigraphy of Proterozoic–Cambrian boundary beds in the western Anabar region, northern Siberia
Abstract
Carbonate-rich sedimentary rocks of the western Anabar region, northern Siberia, preserve an exceptional record of evolutionary and biogeochemical events near the Proterozoic/Cambrian boundary. Sedimentologically, the boundary succession can be divided into three sequences representing successive episodes of late transgressive to early highstand deposition; four parasequences are recognized in the sequence corresponding lithostratigraphically to the Manykai Formation. Small shelly fossils are abundant and include many taxa that also occur in standard sections of southeastern Siberia. Despite this coincidence of faunal elements, biostratigraphic correlations between the two regions have been controversial because numerous species that first appear at or immediately above the basal Tommotian boundary in southeastern sections have first appearances scattered through more than thirty metres of section in the western Anabar. Carbon- and Sr-isotopic data on petrographically and geochemically screened samples collected at one- to two-metre intervals in a section along the Kotuikan River, favour correlation of the Staraya Reckha Formation and most of the overlying Manykai Formation with sub-Tommotian carbonates in southeastern Siberia. In contrast, isotopic data suggest that the uppermost Manykai Formation and the basal 26 m of the unconformably overlying Medvezhya Formation may have no equivalent in the southeast; they appear to provide a sedimentary and palaeontological record of an evolutionarily significant time interval represented in southeastern Siberia only by the sub-Tommotian unconformity. Correlations with radiometrically dated horizons in the Olenek and Kharaulakh regions of northern Siberia suggest that this interval lasted approximately three to six million years, during which essentially all 'basal Tommotian' small shelly fossils evolved.
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The worldwide ECN or N1 negative δ13Ccarb excursion, named BACE, is consistent with the first appearance of small shelly fossils of Anabarites trisulcatus zone, which was calibrated as the beginning of Cambrian.
“The worldwide ECN or N1 negative δ13Ccarb excursion, named the BACE5,45, is consistent with the first appearance of small shelly fossils of Anabarites trisulcatus zone33, which was calibrated as the beginning of Cambrian61.”
From Enhanced weathering as a trigger for the rise of atmospheric O2 level from the late Ediacaran to the early Cambrian (2019) · cites this paper as [61]
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- Authors
- Kaufman, A. J., Knoll, A. H., Semikhatov, M. A., Grotzinger, J. P., Jacobsen, S. B., & Adams, W.
- Affiliations
- Harvard University (US)
- Russian Academy of Sciences (RU)
- Massachusetts Institute of Technology (US)
- Dartmouth College (US)
- Venue
- Geological Magazine
- Publisher
- Cambridge University Press (CUP)
- Published
- 1996-09
- Volume
- 133
- Issue
- 5
- Pages
- 509-533
- ISSN
- 0016-7568 (ISSN-L)
- 1469-5081
- OpenAlex
- W2039544921
- Cited by
- 159
- References
- 4
- Citations by year
- 2026: 4 · 2025: 9 · 2024: 2 · 2023: 5 · 2022: 9 · 2021: 4 · 2020: 8 · 2019: 6 · 2018: 9 · 2017: 1 · 2016: 5 · 2015: 4 · 2014: 4 · 2013: 6 · 2012: 7
- FWCI
- 8.62
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Geological Magazine (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 › Geophysics › Geological and Geochemical Analysis
- Physical Sciences › Earth and Planetary Sciences › Geology › Geological Studies and Exploration
- Keywords
- Tommotian, chronostratigraphy, small shelly fossils, biostratigraphic correlation, carbonate isotopes, strontium isotopes, parasequences
- MeSH terms
- Animals, Carbon Isotopes, Biological Evolution, Fossils, Invertebrates, Paleontology, Siberia, Strontium Isotopes, Geologic Sediments
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