Paleotemperature record of the Middle Devonian Kačák Episode

Published on Aug 16, 2021in Scientific Reports4.38
· DOI :10.1038/S41598-021-96013-3
Thomas J. Suttner10
Estimated H-index: 10
(ASU: Appalachian State University),
Erika Kido (ASU: Appalachian State University)+ 6 AuthorsMichal Kubajko2
Estimated H-index: 2
Sources
Abstract
The Middle Devonian Epoch, ~ 393-383 million years ago, is known for a peak in diversity and highest latitudinal distribution of coral and stromatoporoid reefs. About 388 million years ago, during the late Eifelian and earliest Givetian, climax conditions were interrupted by the polyphased Kacak Episode, a short-lived period of marine dys-/anoxia associated with climate warming that lasted less than 500 kyr. Reconstruction of the seawater temperature contributes to a better understanding of the climate conditions marine biota were exposed to during the event interval. To date, conodont apatite-based paleotemperatures across the Eifelian-Givetian boundary interval have been published from Belarus, France, Germany and North America (10-36° S paleolatitude). Here we provide new δ18Oapatite data from the Carnic Alps (Austria, Italy) and the Prague Synform (Czech Republic). For better approximation of the paleotemperature record across the Kacak Episode, a latitude-dependent correction for Middle Devonian seawater δ18O is applied. Because δ18Oapatite data from shallow marine sections are influenced by regional salinity variations, calculated mean sea surface temperatures (SST) are restricted to more open marine settings (22-34° S paleolatitude). Water temperatures reach ~ 34 °C in the Prague Synform and ~ 33 °C in the Carnic Alps and suggest that SSTs of the southern hemisphere low latitudes were ~ 6 °C higher than previously assumed for this time interval.
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Paleogeography is the study of the changing surface of Earth through time. Driven by plate tectonics, the configuration of the continents and ocean basins has been in constant flux. Plate tectonics...
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Abstract This study provides a comprehensive and quantitative estimate of how global temperatures have changed during the last 540 million years. It combines paleotemperature measurements determined from oxygen isotopes with broader insights obtained from the changing distribution of lithologic indicators of climate, such as coals, evaporites, calcretes, reefs, and bauxite deposits. The waxing and waning of the Earth’s great polar icecaps have been mapped using the past distribution of tillites,...
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#1Marek NarkiewiczH-Index: 19
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Abstract The uppermost Eifelian Kostyukovichi Formation corresponds to a distinct marine transgressive-regressive cycle in predominantly continental to restricted-marine Middle Devonian succession of the intracratonic Belarusian Basin in a near-equatorial area of SE Euramerica. The presence of the conodont ensensis Zone points to the correlation with the global Kacak Episode whose onset coincided with the eustatic If transgression. The comprehensive study of the Kostyukovichi Fm. in 18boreholes ...
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#1Harihar Rajaram (Johns Hopkins University)H-Index: 37
#2Suzana J. Camargo (LDEO: Lamont–Doherty Earth Observatory)H-Index: 62
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#1Emily J. Judd (SU: Syracuse University)H-Index: 5
#2Tripti Bhattacharya (SU: Syracuse University)H-Index: 11
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The dark pelbiodetrital limestone beds of the ‘upper dark interval’ in the Koněprusy area, Central Bohemia, the Czech Republic, the assumed manifestation of the Kacak Event in this area, yielded a moderately diverse faunule of rhynchonelliform brachiopods and trilobites. In total, 15 species have been recognized (13 brachiopods and 2 trilobites), but the majority of them are only tentatively determined to generic level due to fragmentation, rarity or poor preservation. Brachiopod genera Leptaeno...
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The trilobite assemblage of Calceola-bearing beds in the upper part of Acanthopyge Limestone (Chotec Formation, Eifelian) in the Koněprusy area, the Czech Republic, is described. Together with occurrence of Calceola, it indicates absence of significant palaeogeographic barriers restricting the distribution of the Rhenish-Type faunas in the Middle Devonian. The generic composition of the gathered trilobite assemblage somewhat differs from typical Acanthopyge-Phaetonellus assemblage characteristic...
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