Sr and C isotopes in Lower Cambrian carbonates from the Siberian craton: A paleoenvironmental record during the ‘Cambrian explosion’

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

doi:10.1016/0012-821x(94)90178-3

Cited by 207 publications

(93 citation statements)

References 36 publications

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“…While we suggest that the major peaks and troughs are correlative, we acknowledge that sequence stratigraphy, biostratigraphic data and radiometric analyses of high-precision will be necessary to verify more detailed correlations. Kotuikan results also support the view that Sr-isotopic data provide important constraints on earliest Cambrian correlation (Derry et al 1994); however, the available data base remains small.…”

supporting

confidence: 64%

“…The (relatively) low 87 Sr/ 86 Sr values documented in the type lower Tommotian carbonates by Derry et al ( 1994) is not seen in the Kotuikan section (Figs 7, 8). Indeed, accepting the stratigraphic interpretation proposed on the basis of C-isotopes, the decrease in 87 Sr/ 86 Sr documented from Manykai Bed V through the top of the Medvezhya limestones projects smoothly into the relatively low values (c. 0.7081) reported by Derry et al (1994) for basal Tommotian limestones in southeastern Siberia (Fig. 8).…”

Section: Sb Upper Manykai and Medvezha Correlationmentioning

confidence: 81%

“…The overall rise in 87 Sr/ 86 Sr inferred for palaeoseawater from basal Vendian to middle Nemakit-Daldynian times (0.7066 to 0.7086) has been attributed to enhanced continental erosion associated with a latter phase of the Pan-African orogeny (Kaufman, Jacobsen & Knoll, 1993;Gorokhov et al 1994). Derry et al (1994) suggested a similar scenario for the subsequent rise in 87 Sr/ 86 Sr (0.7081 to 0.7088) from the base of the Tommotian to early Middle Cambrian times. A corollary to these interpretations is that the drop in palaeoseawater Sr-isotopic values from the Nemakit-Daldynian peak to the basal Tommotian valley represents either a transient decline in continental inputs or a significant hydrothermal event.…”

Section: Sb Upper Manykai and Medvezha Correlationmentioning

confidence: 88%

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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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supporting

confidence: 64%

Section: Sb Upper Manykai and Medvezha Correlationmentioning

confidence: 81%

Section: Sb Upper Manykai and Medvezha Correlationmentioning

confidence: 88%

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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 chemical compositions of carbonate rocks are influenced by diagenesis when their δ 18 O PDB values are less than −11‰ [24]. Derry et al [25] argue that dolomitization is not a precondition of carbonate rocks that are unaffected by diagenesis. The δ 13 C values of carbonate rocks represent carbon isotope contents at the Proto-Oceanic level when their δ 18 O PDB values are more than −10‰ [26].…”

Section: Sample Collection Test and Data Validity Analysismentioning

confidence: 99%

Sedimentary Environment of the Early Ordovician in Danzhai, Guizhou

Pei¹,

He²,

Luo³

et al. 2017

OJOGas

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This study analyzes the variations in trace element contents and ratios, the distribution patterns of rare earth elements, and the sedimentary environment and its evolution in the Early Ordovician. In particular, the analysis is based on measured section of the Qingjiang Village located in Nangao Town, Danzhai County, Guizhou Province. The analysis also considers thin sections and the characteristics of C, O isotopes. The lower part of the Tongzi Formation has a simple lithology and mainly consists of light gray to gray thin-medium bedded muddy dolomite and dolomicrite with a few dolarenites and dolorudites. The upper part of this formation includes gray thin-medium bedded fine crystalline dolomite and gray massive bioclastic limestone. Only a fraction of gray massive fine crystalline limestone, sparry calcarenite, and calcirudite are on top of the upper part. The Honghuayuan Formation is generally composed of light gray to gray medium-thick bedded or massive bioclastic limestone, reef limestone, and calcarenite with a few sandstones at the bottom. The δ 18O PDB values of 18 samples are less than −11‰; in addition, the Pr/Pr* and Ce/Ce* ratios are greater and less than 1, respectively. These data reflect a sedimentary environment. The lower part of the Tongzi Formation might have been formed in an evaporite platform, which was then transformed into a restricted one, which featured a dry climate, a shallow water depth, and an insufficient amount of oxygen. By contrast, the upper part of the formation was deposited in an open platform, which featured a humid climate and relatively increased water depth and reducibility. During the sedimentary period of the Honghuayuan Formation, the water energy further increased, the climate became humid, the water depth increased, and the reducibility increased. Correspondingly, the sedimentary environment, which originally comprised littoral facies that slowly developed into an open platform and into a platform marginal bank, gradually evolved into a platform How to cite this paper:

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“…Data for the Neoproterozoic include the work of Asmerom et al (1991), Kaufman, Jacobsen & Knoll (1993), Derry et al (1994), Nicholas (1996), Misi & Veizer (1998), Jacobsen & Kaufman (1999), Brasier & Shields (2000), Montañez et al (2000) and Melezhik et al (2001). While these studies show a general overall trend of increasing 87 Sr/ 86 Sr, with minor incursions, through the Cryogenian and Ediacaran, there are also significant differences in actual isotopic values for any given point in time between studies.…”

Section: Secular Variation In Isotopic Sr In Seawater Compositionmentioning

confidence: 99%

Early Neoproterozoic limestones from the Gwna Group, Anglesey

Horák

Evans

2010

Geol. Mag.

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-Limestone megaclasts up to hundreds of metres in size are present within the Gwna Group mélange, North Wales, UK. The mélange has been interpreted as part of a Peri-Gondwanan fore-arc accretionary complex although the age of deposition remains contentious, proposals ranging from Neoproterozoic to Early Ordovician. This paper uses strontium isotope chemostratigraphy to establish the age of the limestone blocks and thus provide a maximum age constraint on mélange formation. Results show that, although the carbonates are locally dolomitized, primary 87 Sr/ 86 Sr ratios can be identified and indicate deposition sometime between the late Tonian and earliest Cryogenian. This age is older than that suggested by stromatolites within the limestone and indicates that the limestone did not form as cap carbonate deposits.

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Sr and C isotopes in Lower Cambrian carbonates from the Siberian craton: A paleoenvironmental record during the ‘Cambrian explosion’

Cited by 207 publications

References 36 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

Sedimentary Environment of the Early Ordovician in Danzhai, Guizhou

Early Neoproterozoic limestones from the Gwna Group, Anglesey

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