Precambrian/Cambrian boundary problem: Carbon isotope correlations for Vendian and Tommotian time between Siberia and Morocco

Magaritz, Mordeckai; Kirschvink, Joseph L.; Latham, A. J. H.; Zhuravlev, Andrey Yu.; Rozanov, A. Yu.

doi:10.1130/0091-7613(1991)019<0847:pcbpci>2.3.co;2

Cited by 103 publications

(75 citation statements)

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“…9; note that the base of the Ust'-Yudoma Formation is not exposed at Dvortsy and the underlying Aim Formation of the Yudoma Group is missing throughout the Aldan region (Semikhatov & Serebryakov, 1983)). The isotopic peak in Manykai Bed III (just above the base of parasequence 2) is here correlated with the peak midway through the U st'-Yudoma section at Dvortsy labelled 'Z' by Brasier, Khomentovsky & Corfield (1993;Magaritz, Holser & Kirschvink, 1986;Kirschvink et al 1991; Fig. 9).…”

Section: Chemo-and Biostratigraphic Correlation With Southeastern Sibmentioning

confidence: 93%

“…The best available C-isotopic record for uppermost Proterozoic and basal Cambrian carbonates comes from the sections along the Aldan and Lena rivers that contain the definitional initial Tommotian boundary, type Tommotian succession and associated fossil assemblages discussed in Section 3 (Magaritz, Holser & Kirschvink, 1986;Magaritz et al 1991;Kirschvink et al 1991;Brasier, Khomentovsky & Corfield, 1993;Brasier et al 1994b; Fig. 9).…”

Section: Chemo-and Biostratigraphic Correlation With Southeastern Sibmentioning

confidence: 99%

“…Indeed, Early Cambrian isotopic peaks comparable in magnitude to that seen in the upper Kotuikan succession have been documented in Morocco (Tucker, 1986;Magaritz et al 1991), India (Aharon, Schidlowski & Singh, 1987), and Iran (Brasier et al 1990)-southeastem Siberia is unusual in lacking a comparable C-isotopic excursion.…”

mentioning

confidence: 99%

“…Palaeomagnetic reversal stratigraphy may also prove important in boundary correlations (e.g. Kirschvink et al 1991 ), but available data are limited.…”

Section: Introductionmentioning

confidence: 99%

“…Chemostratigraphy based on the isotopic compositions of carbon and (to a lesser extent) strontium in marine carbonates has been shown to be effective in the correlation of terminal Proterozoic , and references cited therein) and Early Cambrian (Kirschvink et al 1991;Magaritz et al 1991;Brasier, Khomentovsky & Corfield, 1993;Brasier et al 1994b) carbonate-bearing successions. Given their amplitude and repeated occurrence, C-isotopic excursions, in particular, show great potential for resolving important questions of correlation among successions that document the initial diversification of animals.…”

Section: Introductionmentioning

confidence: 99%

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Integrated chronostratigraphy of Proterozoic–Cambrian boundary beds in the western Anabar region, northern Siberia

et al. 1996

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-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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Section: Chemo-and Biostratigraphic Correlation With Southeastern Sibmentioning

confidence: 93%

Section: Chemo-and Biostratigraphic Correlation With Southeastern Sibmentioning

confidence: 99%

mentioning

confidence: 99%

“…Palaeomagnetic reversal stratigraphy may also prove important in boundary correlations (e.g. Kirschvink et al 1991 ), but available data are limited.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Integrated chronostratigraphy of Proterozoic–Cambrian boundary beds in the western Anabar region, northern Siberia

et al. 1996

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The earliest known West Gondwanan trilobites from the Anti‐Atlas of Morocco, with a revision of the Family Bigotinidae Hupé, 1953

Geyer¹

2019

Fossils and Strata

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Evolution patterns of seawater carbon isotope composition during the Cambrian and their stratigraphic significance

Wang

Jiang

et al. 2020

Geological Journal

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Our current understanding of the Cambrian carbon cycle mostly comes from geologically rapid carbon isotope excursions (CIEs) of marine carbonate. In addition to carbon cycle indicators, stable carbon isotopes of marine carbonates can be used as stratigraphic correlation tools. Previous studies have recognized 10 CIEs in the Cambrian, but only 3 of them appear to have global significance. This limits the application of CIEs in chronostratigraphic correlation of Cambrian successions with the 10 successive stages. Here, we present a continuous carbon isotope record from a stratigraphically complete Cambrian section at Xiaoerbulak, Aksu region in the Tarim Basin, Xinjiang, China. Its comparison with more than 40 sections across the world shows the carbon isotope record of the Cambrian can be divided into 10 units based on the variation patterns. Each pattern has occurrences in at least two Cambrian tectonic plates, suggesting global significance. A generalized curve consisting of the 10 patterns, Carbon Isotope Pattern Curve (CIPC) has been compiled. Based on the fossil records, the 10 patterns are correlated with the 10 stages of the chronostratigraphic system of the Cambrian. The pattern Angularianis correlated with Fortunian Stage and the lower half of Stage 2, Dampingian with the upper part of Stage 2, Boxian with Stage 3, Rabbitian with Stage 4, Chairian with the lower half of Wuliuan, Zigzagian with the upper Wuliuan Stage, Stickian with the Drumian and Guzhangian stages, Towerian with the Paibian Stage and Lower Jiangshan Stage, Shelfian with Upper Jiangshan Stage and the lower half of Stage 10, and Hillian with the upper half of Stage 10.We suggest that the application of CIPC makes the chronostratigraphy of non‐fossiliferous successions realizable.

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Precambrian/Cambrian boundary problem: Carbon isotope correlations for Vendian and Tommotian time between Siberia and Morocco

Cited by 103 publications

References 0 publications

Integrated chronostratigraphy of Proterozoic–Cambrian boundary beds in the western Anabar region, northern Siberia

Integrated chronostratigraphy of Proterozoic–Cambrian boundary beds in the western Anabar region, northern Siberia

The earliest known West Gondwanan trilobites from the Anti‐Atlas of Morocco, with a revision of the Family Bigotinidae Hupé, 1953

Evolution patterns of seawater carbon isotope composition during the Cambrian and their stratigraphic significance

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