Carbon isotope chemostratigraphy and conodonts of the Middle–Upper Ordovician succession in the Tungus Basin, Siberian Craton

Ainsaar, Leho; Männik, Peep; Dronov, A. V.; Izokh, O. P.; Meidla, Tõnu; Tinn, Oive

doi:10.1016/j.palwor.2015.03.002

Cited by 18 publications

(16 citation statements)

References 26 publications

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“…1). Strata containing the Kalana exceptionally preserved fossils are no older than the middle Aeronian Pribylograptus leptotheca graptolite Zone and are in the middle of the Pranognathus tenuis conodont Zone (Ainsaar et al, 2014; Männik et al, 2016), which places these strata in the middle Aeronian.…”

Section: Geographic and Stratigraphic Occurrencesmentioning

confidence: 99%

“…The majority of gastropod and rhynchonelliformean brachiopod specimens occur in storm-deposited coquina lenses. Although relatively rare, the remainder of the fauna includes tabulate and rugose corals, orthocone and coiled cephalopods, trilobites, and rare vertebrate fossils (Tinn et al, 2009; Ainsaar et al, 2014; Mastik and Tinn, 2015; Männik et al, 2016; Tinn and Märss, 2018). The preservation varies largely from soft-bodied fossils with exquisitely preserved details to decalcified molds of shelly fauna.…”

Section: Preservation Of the Kalana Lagerstättementioning

confidence: 99%

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Kalana Lagerstätte crinoids: Early Silurian (Llandovery) of central Estonia

2019

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The Kalana Lagerstätte of early Aeronian (Llandovery, Silurian) age in central Estonia preserves a diverse shallow marine biota dominated by non-calcified algae. This soft-tissue flora and decalcified and calcified crinoids are preserved in situ, in a lens of microlaminated, dolomitized micrite interbedded in a sequence of dolomitized packstones and wackestones. Although the Lagerstätte is dominated by non-calcified algae, crinoids (together with brachiopods and gastropods) are among the most common organisms that were originally comprised of a carbonate skeleton. Two new crinoids are described from this unit, Kalanacrinus mastikae n. gen. n. sp. (large camerate) and Tartucrinus kalanaensis n. gen. n. sp. (small disparid). Interestingly, these two crinoids display contrasting preservation, with the more common large camerate preserved primarily as a decalcified organic residue, whereas the smaller disparid is preserved primarily in calcite. Preservation was assessed using elemental mapping of C, Ca, S, and Si. Columns have the highest portion of Ca, once living soft tissue is indicated by C, S was dispersed as pyrite or associated with organics, and Si is probably associated with clay minerals in the matrix. This new fauna increases our understanding of the crinoid radiation on Baltica following Late Ordovician extinctions.UUID: http://zoobank.org/fb1f98c4-d35a-43f4-aa0d-75e4f8154a13

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Section: Geographic and Stratigraphic Occurrencesmentioning

confidence: 99%

Section: Preservation Of the Kalana Lagerstättementioning

confidence: 99%

Kalana Lagerstätte crinoids: Early Silurian (Llandovery) of central Estonia

2019

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“…In the Argentine Precordillera, incomplete MDICE records have also been reported (Albanesi et al, 2013). In other areas, such as the Tarim Basin, South Korea, Siberia, and North America, the characteristics of the MDICE vary in each region, but it is dated in all sections in the Y. crassus to E. pseudoplanus biozones (Figure 8) (Ainsaar et al, 2015;Bang & Lee, 2020;Calner et al, 2014;Edwards & Saltzman, 2014;Lehnert, Meinhold, Wu, Calner, & Joachimski, 2014;Leslie et al, 2011;Liu et al, 2016). Globally, the long-term trend of increasing δ 13 C carb values from the Y. crassus Biozone to E. pseudoplanus Biozone also have global correlation significance especially in South China, representing the rising limb of MDICE.…”

Section: Discussionmentioning

confidence: 99%

Middle to Late Ordovician carbon isotope chemostratigraphy of the Lower Yangtze Platform: Implications for global correlation

et al. 2021

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Middle to Late Ordovician carbonates were collected in South China (Anhui Province) from the Kuniutan, Datianba, and Pagoda formations in the Dingxiang and Daling sections and analysed for high-resolution carbon isotope chemostratigraphy. An increase by 0.4‰ in δ 13 C carb is observed in the upper part of the Kuniutan Formation (Eoplacognathus pseudoplanus Biozone), representing the rising limb of the Middle Darriwilian Isotopic Carbon Excursion (MDICE). In the upper part of the Datianba Formation, positive shifts of ca. 1‰ are recorded in the studied section which compare with the carbon shifts reported in North America and Baltoscandia. A pronounced positive δ 13 C carb excursion of ca. 1.5‰ from the lower part of the Pagoda Formation can be correlated with the global Guttenberg Isotopic Carbon Excursion (GICE). The documentation of three carbon isotope shifts in this study provides new evidence for changes in the global carbon cycle from Darriwilian to Early Katian which could have been influenced by changes in global climate and primary productivity.

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“…Although the Siberian dataset is the largest, the Siberia regional stages are problematic to link to Baltican and international stages due to the endemic faunas (Dronov, 2013(Dronov, , 2017Sennikov et al, 2015). The best means to do this independently of the magnetostratigraphy is Palaeo 3 : Pg15 carbon isotope stratigraphy, supported by limited cosmopolitan biostratigraphic data and sequence stratigraphy (Kanygin et al, 2010;Ainsaar et al, 2015). Two biostratigraphic tie points in the Volginian and basal Chertovskian stages allows linkage of the Siberian sections into the late Darriwilian-Sandbian interval (Dronov, 2017).…”

Section: Middle and Upper Ordovician Geomagnetic Polaritymentioning

confidence: 99%