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Artinskian

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Artinskian
290.1 ± 0.26 – 283.5 ± 0.6 Ma
Chronology
Etymology
Name formalityFormal
Usage information
Celestial bodyEarth
Regional usageGlobal (ICS)
Time scale(s) usedICS Time Scale
Definition
Chronological unitAge
Stratigraphic unitStage
Time span formalityFormal
Lower boundary definitionFAD of the Conodont Sweetognathus whitei
Lower boundary GSSPDalny Tulkas section, Southern Ural Mountains, Russia
53°55′29″N 56°30′58″E / 53.9247°N 56.51615°E / 53.9247; 56.51615
Lower GSSP ratifiedFebruary 2022[2]
Upper boundary definitionNot formally defined
Upper boundary definition candidatesNear FAD of the Conodont Neostreptognathodus pnevi
Upper boundary GSSP candidate section(s)Mechetlino, Southern Ural Mountains, Russia

In the geologic timescale, the Artinskian is an age or stage of the Permian. It is a subdivision of the Cisuralian Epoch or Series. The Artinskian likely lasted between 290.1 and 283.5 million years ago (Ma) according to the most recent revision of the International Commission on Stratigraphy (ICS) in 2022.[1] It was preceded by the Sakmarian and followed by the Kungurian.

Stratigraphy

Jimbacrinus bostocki Artinskian of Australia. (Found near Jimba Jimba Station )

The Artinskian is named after the goniatite grits of Artinsk which was introduced by Roderick Murchison, Édouard de Verneuil and count Alexander von Keyserling in their "The Geology of Russia in Europe and the Ural Mountains" (1845).[3] The grits of Artinsk, in turn, get its name from the Artinsky District with center in the Russian smalltown of Arti (formerly Artinsk zavod), situated in the middle Urals, about 170 km southwest of Yekaterinburg. The stage was introduced into scientific literature by Alexander Karpinsky in 1874.[4]

Base of the Artinskian

The base of the Artinskian Stage is defined as the first appearance datum (FAD) of the conodont species Sweetognathus whitei and Mesogondolella bisselli. In order to constrain this age, the ICS subcommission on Permian stratigraphy informally proposed a candidate GSSP in 2002, later followed by a formal proposal in 2013. The proposed GSSP location — the Dal'ny Tulkas roadcut in the Southern Urals, near the town of Krasnousolsky[5] — was eventually ratified in February 2022.[2]

U-Pb radiometric dating found that the base of the Artinskian was approximately 290.1 million years old (Ma), based on the position of the rock layer at the Dal'ny Tulkas roadcut containing the FAD of S. whitei relative to three precisely dated ash beds surrounding it.[6] Earlier radiometric reported a much younger age of 280.3 Ma for the Sakmarian-Artinskian boundary.

Top of the Artinskian

The top of the Artinskian (and the base of the Kungurian) is defined as the place in the stratigraphic record where fossils of conodonts Neostreptognathodus pnevi and Neostreptognathodus exculptus first appear.[4] The proposed GSSP candidate — the Mechetlino section (Southern Urals).[7]

Artinskian Warming Event

Around 287 million years ago occurred an interval of pronounced warming known as the Artinskian Warming Event (AWE). This period of global warming accelerated the deglaciation that had been occurring since the Sakmarian following the end of the most intense glacial phase of the Late Palaeozoic Ice Age.[8] In addition, it is also associated with significant global drying, which had gradually been occurring since the Carboniferous-Permian boundary.[9][10] Major aridification during the AWE is evidenced by a positive δ18O excursion observed in brachiopod fossils,[11] with arid and semi-arid conditions expanding across much of Pangaea as glaciers receded to refugia in the polar regions of Gondwana.[8]

References

  1. ^ a b "Chart/Time Scale". www.stratigraphy.org. International Commission on Stratigraphy.
  2. ^ a b "Ratification of Artinskian GSSP". International Commission on Stratigraphy. Retrieved 23 March 2022.
  3. ^ A. Karpinsky. Artinsk ammonitae of Novaya Zemlya (posthumous edition). Moscow, Leningrad,1949
  4. ^ a b Gradstein, Felix M.; Ogg, James G.; Smith, Alan G. (2004). A Geologic Time Scale 2004. Cambridge University Press. ISBN 9780521786737.
  5. ^ Chuvashov, Boris I.; Chernykh, Valery V.; Shen, Shuzhong; Henderson, Charles M. (2013). "Proposal for the Global Stratotype Section and Point (GSSP) for the base-Artinskian Stage (Lower Permian)". Permophiles. 58: 26–34.
  6. ^ Schmitz, Mark D.; Davydov, Vladimir I. (March–April 2012). "Quantitative radiometric and biostratigraphic calibration of the Pennsylvanian–Early Permian (Cisuralian) time scale and pan-Euramerican chronostratigraphic correlation". Geological Society of America Bulletin. 124 (3/4): 549–577. Bibcode:2012GSAB..124..549S. doi:10.1130/B30385.1.
  7. ^ V. V. Chernykh, G. V. Kotlyar, R. V. Kutygin, T. V. Filimonova, G. M. Sungatullina, G. A. Mizens, R. Kh. Sungatullin, T. N. Isakova, M. S. Boiko, A. O. Ivanov, E. V. Mychko (2018). "The Mechetlino section (Southern Urals). Paleontological Characteristics (in Russian)". Geologichesky Vestnik (1): 119–137. doi:10.31084/2619-0087/2018-1-11. S2CID 188086370.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  8. ^ a b Marchetti, Lorenzo; Forte, Giuseppa; Kustatscher, Evelyn; DiMichele, William A.; Lucas, Spencer G.; Roghi, Guido; Juncal, Manuel A.; Hartkopf-Fröder, Christoph; Krainer, Karl; Morelli, Corrado; Ronchi, Ausonio (March 2022). "The Artinskian Warming Event: an Euramerican change in climate and the terrestrial biota during the early Permian". Earth-Science Reviews. 226: 103922. Bibcode:2022ESRv..22603922M. doi:10.1016/j.earscirev.2022.103922. S2CID 245892961. Retrieved 30 October 2022.
  9. ^ Mujal, Eudald; Fortuny, Josep; Marmi, Josep; Dinarès-Turell, Jaume; Bolet, Arnau; Oms, Oriol (January 2018). "Aridification across the Carboniferous–Permian transition in central equatorial Pangea: The Catalan Pyrenean succession (NE Iberian Peninsula)". Sedimentary Geology. 363: 48–68. Bibcode:2018SedG..363...48M. doi:10.1016/j.sedgeo.2017.11.005. S2CID 133713470. Retrieved 30 October 2022.
  10. ^ Michel, Lauren A.; Tabor, Neil J.; Montañez, Isabel P.; Schmitz, Mark D.; Davydov, Vladimir (15 July 2015). "Chronostratigraphy and Paleoclimatology of the Lodève Basin, France: Evidence for a pan-tropical aridification event across the Carboniferous–Permian boundary". Palaeogeography, Palaeoclimatology, Palaeoecology. 430: 118–131. Bibcode:2015PPP...430..118M. doi:10.1016/j.palaeo.2015.03.020.
  11. ^ Grossman, Ethan L.; Yancey, Thomas E.; Jones, Thomas E.; Bruckschen, Peter; Chuvashov, Boris; Mazzullo, S. J.; Mii, Horng-sheng (24 October 2008). "Glaciation, aridification, and carbon sequestration in the Permo-Carboniferous: The isotopic record from low latitudes". Palaeogeography, Palaeoclimatology, Palaeoecology. 286 (3–4): 222–233. Bibcode:2008PPP...268..222G. doi:10.1016/j.palaeo.2008.03.053. Retrieved 30 October 2022.
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