A carbon isotope reference scale for the Lower Cambrian succession in Siberia: report of IGCP Project 303

Brasier, Martin D.; Rozanov, A. Yu.; Zhuravlev, Andrey Yu.; Corfield, Richard; Derry, Louis A.

doi:10.1017/s0016756800012851

Cited by 90 publications

(84 citation statements)

References 38 publications

(73 reference statements)

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“…The well-constrained biostratigraphic assignment of Pedroche carbonates to the early Ovetian, equivalent to the base of Cambrian Series 2 and the Siberian Atdabanian Stage (Jensen et al, 2010) makes a prediction for their C-isotopic composition. Consistent with this prediction, δ 13 C carb values from Arroyo Pedroche appear to capture the apex of a positive excursion, with absolute values like those of the early Atdabanian Stage IV excursion in Siberia (Brasier et al, 1994;Kouchinsky et al, 2007). Within the Arroyo Pedroche section, these positive δ 13 C carb values precede a plateau of -1.5‰, further consistent with values recorded from expanded sections of early Atdabanian age (Maloof et al, 2005;Kouchinsky et al, 2007).…”

Section: Carbon Isotopic Chemostratigraphysupporting

confidence: 78%

Geobiology of a lower Cambrian carbonate platform, Pedroche Formation, Ossa Morena Zone, Spain

Creveling

Fernández-Remolar

Rodríguez-Martínez

et al. 2013

Palaeogeography, Palaeoclimatology, Palaeoecology

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The Cambrian Pedroche Formation comprises a mixed siliciclastic–carbonate succession recording subtidal deposition on a marine platform. Carbonate carbon isotope chemostratigraphy confirms previous biostratigraphic assignment of the Pedroche Formation to the Atdabanian regional stage of Siberia, correlative to Cambrian Series 2. At the outcrop scale, thrombolitic facies comprise ~60% of carbonate-normalized stratigraphy and coated-grains another ~10%. Petrographic point counts reveal that skeletons contribute at most 20% to thrombolitic inter-reef and reef-flank lithologies; on average, archaeocyath clasts make up 68% of skeletal materials. In contrast, petrographic point counts show that skeletons comprise a negligible volume of biohermal and biostromal thrombolite, associated nodular carbonate facies, and ooid, oncoid and peloid grainstone facies. As such, archaeocyathan reefal bioconstructions represent a specific and limited locus of skeletal carbonate production and deposition. Consistent with data from coeval, globally dispersed lower Cambrian successions, our analysis of the Pedroche Formation supports the view that lower Cambrian carbonates have more in common with earlier, Neoproterozoic deposits than with younger carbonates dominated by skeletal production and accumulatio

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Section: Carbon Isotopic Chemostratigraphysupporting

confidence: 78%

Geobiology of a lower Cambrian carbonate platform, Pedroche Formation, Ossa Morena Zone, Spain

Creveling

Fernández-Remolar

Rodríguez-Martínez

et al. 2013

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…The onset of the crisis on the Siberian Figure 4. First appearances of skeletal fossil groups on the Siberian Platform (S1-S13, see Appendix 1 for details) in the key sections correlated with the δ 13 C chemostratigraphy (after Brasier, Khomentovsky & Corfield, 1993;Brasier et al 1994b;Kouchinsky et al 2001 Platform (Sinsk event), is marked by decreasing δ 13 C values above peak VII of the Siberian reference scale (Brasier et al 1994a,b;Zhuravlev & Wood, 1996;Li et al 2007;Fig. 4).…”

Section: Chronology Of Early Cambrian Biomineralizationmentioning

confidence: 99%

“…The uppermost peak in the rising trend of δ 13 C values within Stage 2 is dated in Morocco to 525.4 ± 0.5 Ma (Maloof et al 2005), later revised to 525.343 ± 0.088 Ma (Maloof et al 2010a,b). The high-resolution successions of δ 13 C peaks in Morocco and Siberia (Brasier et al 1994b;Kouchinsky et al 2007) proved to be very similar, and their correlation resulted in a c. 525 Ma estimate of the age of the Nemakit-DaldynianTommotian boundary dated in Morocco to 524.837 ± 0.092 Ma (Maloof et al 2010a,b). Chemostratigraphic δ 13 C correlation with radiometrically dated sections of Morocco allows dating of the lower boundary of the Atdabanian Stage in Siberia to a maximum age of 520.93 ± 0.14 Ma (Maloof et al 2010a,b) Maloof et al 2010a).…”

Section: Chronology Of Early Cambrian Biomineralizationmentioning

confidence: 99%

Chronology of early Cambrian biomineralization

et al. 2011

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-Data on the first appearances of major animal groups with mineralized skeletons on the Siberian Platform and worldwide are revised and summarized herein with references to an improved carbon isotope stratigraphy and radiometric dating in order to reconstruct the Cambrian radiation (popularly known as the 'Cambrian explosion') with a higher precision and provide a basis for the definition of Cambrian Stages 2 to 4. The Lophotrochozoa and, probably, Chaetognatha were first among protostomians to achieve biomineralization during the Terreneuvian Epoch, mainly the Fortunian Age. Fast evolutionary radiation within the Lophotrochozoa was followed by radiation of the sclerotized and biomineralized Ecdysozoa during Stage 3. The first mineralized skeletons of the Deuterostomia, represented by echinoderms, appeared in the middle of Cambrian Stage 3. The fossil record of sponges and cnidarians suggests that they acquired biomineralized skeletons in the late Neoproterozoic, but diversification of both definite sponges and cnidarians was in parallel to that of bilaterians. The distribution of calcium carbonate skeletal mineralogies from the upper Ediacaran to lower Cambrian reflects fluctuations in the global ocean chemistry and shows that the Cambrian radiation occurred mainly during a time of aragonite and high-magnesium calcite seas.

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“…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%

“…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%

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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A carbon isotope reference scale for the Lower Cambrian succession in Siberia: report of IGCP Project 303

Cited by 90 publications

References 38 publications

Geobiology of a lower Cambrian carbonate platform, Pedroche Formation, Ossa Morena Zone, Spain

Geobiology of a lower Cambrian carbonate platform, Pedroche Formation, Ossa Morena Zone, Spain

Chronology of early Cambrian biomineralization

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

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