Chronology and Eccentricity Phasing for the Early Turonian Greenhouse (approx. 93-94 Ma): Constraints on Astronomical Control of the Carbon Cycle
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F21%3A10432908" target="_blank" >RIV/00216208:11310/21:10432908 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=_5rc8IP7US" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=_5rc8IP7US</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1029/2020PA004188" target="_blank" >10.1029/2020PA004188</a>
Alternative languages
Result language
angličtina
Original language name
Chronology and Eccentricity Phasing for the Early Turonian Greenhouse (approx. 93-94 Ma): Constraints on Astronomical Control of the Carbon Cycle
Original language description
The Early Turonian interval represents a unique confluence of climatic and oceanographic conditions including peak surface temperatures, high greenhouse-gas concentrations, and maximum Phanerozoic sea level. The susceptibility of this climate mode to astronomical insolation forcing remains poorly understood partly due to a limited time control and unknown phasing of astronomical cycles in this interval. Here, we offer a refined astrochronology of the Early Turonian based on laterally consistent precession signals preserved in offshore strata of the Bohemian Cretaceous Basin (central Europe). Pristine amplitude modulation verified through interference patterns in depth-frequency plots provides a robust indication of approx. 100 and 405-kyr eccentricity phases (maxima and minima) that are pinned to ammonite biozones and new carbon-isotope data from two cores. The Early Turonian is estimated as 885 +/- 41 (2 sigma) thousand years (kyr) in duration, with the Cenomanian/Turonian boundary predating the first Turonian 405-kyr maximum (no. 232 in the Geological Time Scale 2020) by 82 +/- 70 (2 sigma) kyr. The results support a possible link of the recovery from Oceanic Anoxic Event II to increasing magnitude of seasonal insolation extremes due to rising eccentricity on 405-kyr and million-year (Myr) time scales. Superimposed upon this trend are small-scale carbon-isotope anomalies the pacing of which passes from approx. 110 kyr, resembling short eccentricity, to approx. 170 kyr, possibly related to obliquity modulation. This eccentricity-to-obliquity transition, paralleling the rising phase of Myr-scale eccentricity, suggests decoupling of the carbon-cycle perturbations from low-latitude seasonal insolation. Mid-latitude to high-latitude carbon reservoirs became involved toward the Middle Turonian.
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/GA17-10982S" target="_blank" >GA17-10982S: Sea-level change and global carbon cycle in greenhouse climate: trans-Atlantic correlation of Turonian (mid-Cretaceous) sedimentary archives</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
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
Paleoceanography and Paleoclimatology
ISSN
2572-4517
e-ISSN
—
Volume of the periodical
36
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
19
Pages from-to
e2020PA004188
UT code for WoS article
000644566400019
EID of the result in the Scopus database
2-s2.0-85104934266