Redox geochemistry of the red ‘orthoceratite limestone’ of Baltoscandia: Possible linkage to mid-Ordovician palaeoceanographic changes
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F21%3A00000085" target="_blank" >RIV/00025798:_____/21:00000085 - isvavai.cz</a>
Alternative codes found
RIV/67985831:_____/21:00542527 RIV/00216224:14310/21:00119061 RIV/61989592:15310/21:73610768
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0037073821000865" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0037073821000865</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.sedgeo.2021.105934" target="_blank" >10.1016/j.sedgeo.2021.105934</a>
Alternative languages
Result language
angličtina
Original language name
Redox geochemistry of the red ‘orthoceratite limestone’ of Baltoscandia: Possible linkage to mid-Ordovician palaeoceanographic changes
Original language description
The orthoceratite limestone of the Ordovician epicontinental sea of Baltoscandia is one of the oldest Phanerozoicexamples of pelagic marine red beds (MRBs). Being enriched in authigenic haematite, MRBs are considered to besensitive palaeoceanographic redox indicators. In this paper, the origin of the reddening of the Ordovician MRBsand its timing and redox conditions were addressed at two sections, and in a drill core in the Kinnekulle area,Sweden, through the application of diffuse reflectance spectroscopy, sedimentary petrology (microfacies andelectron microprobe), bulk-rock and in-situ element geochemistry (laser-ablation ICP-MS) and molybdenumstable isotope systematics. Enrichment in haematite (up to ~0.05 wtprocent) occurred during very early diagenesisunder low sedimentation rates (~5 mm/kyr), which is comparable to several examples of Phanerozoic MRBs.The reddening was associated with the mm-scale, in-situ mobility of Fe, Mn, As, Mo and U, due to Fe–Mnredox cycling between primary and secondary minerals and pore water under oxic and suboxic to anoxic conditions; it was not related to significant changes in seawater chemistry. Stratigraphic red-to-grey transitions likelycoincided with two mid-Darriwilian global regressions (the so-called Täljsten and at the base of the GullhögenFormation), likely due to the effects of changing sedimentation rates and sub-bottom redox potentials. The Ordovician MRBs coincided with a positive delta13C excursion during the middle Darriwilian, which is different to MRBexamples cited from the Devonian to the Cretaceous age, which frequently coincide with shifts to lower valuesof delta13C. Although MRBs are believed to show a time-specific occurrence in greenhouse or transitionalgreenhouse-to-icehouse climatic modes by several authors, our study suggests that causal links between MRBsand global carbon cycle remain unclear
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
<a href="/en/project/GA19-17435S" target="_blank" >GA19-17435S: Palaeoclimatologic significance of Palaeozoic red pelagic carbonates: time specific facies or products of microbial activity?</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Sedimentary Geology
ISSN
0037-0738
e-ISSN
1879-0968
Volume of the periodical
420
Issue of the periodical within the volume
July : 105934
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
16
Pages from-to
nestránkováno
UT code for WoS article
000659165600010
EID of the result in the Scopus database
2-s2.0-85106313858