Boltysh crater: Difference between revisions
Hemiauchenia (talk | contribs) No edit summary |
→Age: "fern spikes" - changed to "unusually high abundances of ancient fern spores (fern spikes)" with wikilink |
||
| Line 45: | Line 45: | ||
Subsequent [[radiometric dating]] reduced the uncertainty. The concentration of {{chem|U|238|link=uranium-238}} decay products in impact glasses from the crater were used to derive an age of 65.04 ± 1.10 million years. Analysis of [[argon]] radioactive decay products yielded an age of 65.17 ± 0.64 million years.<ref>{{Cite journal|last=Kelley|first=Simon P.|last2=Gurov|first2=Eugene|date=August 2002|title=Boltysh, another end-Cretaceous impact|url=http://dx.doi.org/10.1111/j.1945-5100.2002.tb00875.x|journal=Meteoritics & Planetary Science|volume=37|issue=8|pages=1031–1043|doi=10.1111/j.1945-5100.2002.tb00875.x|issn=1086-9379}}</ref> These ages are similar to that of Chicxulub Crater which argon dating yielded an age of 66.043 ± 0.011 million years. |
Subsequent [[radiometric dating]] reduced the uncertainty. The concentration of {{chem|U|238|link=uranium-238}} decay products in impact glasses from the crater were used to derive an age of 65.04 ± 1.10 million years. Analysis of [[argon]] radioactive decay products yielded an age of 65.17 ± 0.64 million years.<ref>{{Cite journal|last=Kelley|first=Simon P.|last2=Gurov|first2=Eugene|date=August 2002|title=Boltysh, another end-Cretaceous impact|url=http://dx.doi.org/10.1111/j.1945-5100.2002.tb00875.x|journal=Meteoritics & Planetary Science|volume=37|issue=8|pages=1031–1043|doi=10.1111/j.1945-5100.2002.tb00875.x|issn=1086-9379}}</ref> These ages are similar to that of Chicxulub Crater which argon dating yielded an age of 66.043 ± 0.011 million years. |
||
Radiometric dating places the Boltysh crater thousands of years after the Chicxulub crater, but an August 2010 study of ancient [[fern]] |
Radiometric dating places the Boltysh crater thousands of years after the Chicxulub crater, but an August 2010 study of unusually high abundances of ancient fern spores ([[fern spike]]s) suggests the Boltysh impact may have occurred several thousand years before Chicxulub.<ref>{{Cite journal|last=Jolley|first=David|last2=Gilmour|first2=Iain|last3=Gurov|first3=Eugene|last4=Kelley|first4=Simon|last5=Watson|first5=Jonathan|date=September 2010|title=Two large meteorite impacts at the Cretaceous-Paleogene boundary|url=http://pubs.geoscienceworld.org/geology/article/38/9/835/130359/Two-large-meteorite-impacts-at-the|journal=Geology|language=en|volume=38|issue=9|pages=835–838|doi=10.1130/G31034.1|issn=1943-2682}}</ref> |
||
In June 2021, a new study estimated that Boltysh formed about 65.39 ± 0.14/0.16 million years ago, 650,000 years after the Chicxulub catastrophe, contradicting the conclusions of the 2010 study, and suggested that the fern spike was a result of the impact itself. The authors of the paper suggested that the impact may have disrupted recovery after the K/Pg extinction.<ref>{{Cite journal|last=Pickersgill|first=Annemarie E.|last2=Mark|first2=Darren F.|last3=Lee|first3=Martin R.|last4=Kelley|first4=Simon P.|last5=Jolley|first5=David W.|date=2021-06-01|title=The Boltysh impact structure: An early Danian impact event during recovery from the K-Pg mass extinction|url=https://advances.sciencemag.org/content/7/25/eabe6530|journal=Science Advances|language=en|volume=7|issue=25|pages=eabe6530|doi=10.1126/sciadv.abe6530|issn=2375-2548|pmid=34144979}}</ref> |
In June 2021, a new study estimated that Boltysh formed about 65.39 ± 0.14/0.16 million years ago, 650,000 years after the Chicxulub catastrophe, contradicting the conclusions of the 2010 study, and suggested that the fern spike was a result of the impact itself. The authors of the paper suggested that the impact may have disrupted recovery after the K/Pg extinction.<ref>{{Cite journal|last=Pickersgill|first=Annemarie E.|last2=Mark|first2=Darren F.|last3=Lee|first3=Martin R.|last4=Kelley|first4=Simon P.|last5=Jolley|first5=David W.|date=2021-06-01|title=The Boltysh impact structure: An early Danian impact event during recovery from the K-Pg mass extinction|url=https://advances.sciencemag.org/content/7/25/eabe6530|journal=Science Advances|language=en|volume=7|issue=25|pages=eabe6530|doi=10.1126/sciadv.abe6530|issn=2375-2548|pmid=34144979}}</ref> |
||
Revision as of 11:32, 22 June 2021
| Boltysh crater | |
|---|---|
  | |
| Impact crater/structure | |
| Confidence | Confirmed[1] |
| Diameter | 24 kilometres (15 mi) |
| Depth | 550 metres (1,800 ft) |
| Age | 65.39 ± 0.14/0.16 mya, Danian |
| Exposed | No |
| Drilled | Yes |
| Location | |
| Coordinates | 48°45′N 32°10′E / 48.750°N 32.167°E |
| Country | Ukraine |
| Region | Kirovohrad Oblast |
The Boltysh crater or Bovtyshka crater is a buried impact crater in the Kirovohrad Oblast of Ukraine,[1] near the village of Bovtyshka. The crater is 24 kilometres (15 mi) in diameter and its age of 65.39 ± 0.14/0.16 million years, based on argon-argon dating techniques, less than 1 million years younger than Chicxulub crater in Mexico and the Cretaceous–Paleogene boundary (K–Pg boundary). The Chicxulub impact is believed to have caused the mass extinction at the end of the Cretaceous period, which included the extinction of the non-avian dinosaurs. The Boltysh impact likely occurred several thousand years after Chicxulub, suggesting the extinction event may have been driven by multiple meteor strikes over an extended period of time about 65 million years ago.[2] A 2021 study, however, "indicated that the strike crater did not factor into the apocalyptic die-off of the dinosaurs."[3]
Overview
Boltysh crater is located in central Ukraine, in the basin of the Tiasmyn River, a tributary of the Dnieper River. It is 24 kilometres (15 mi) in diameter, and is surrounded by an ejecta blanket of breccia preserved over an area of 6,500 square kilometres (2,500 sq mi). It is estimated that immediately after the impact, ejecta covered an area of 25,000 square kilometres (9,700 sq mi) to a depth of 1 metre (3.3 ft) or greater, and was some 600 metres (2,000 ft) deep at the crater rim.
The crater contains a central uplift about 6 kilometres (3.7 mi) in diameter, rising about 550 metres (1,800 ft) above the base level of the crater. This uplift currently lies beneath about 500 metres (1,600 ft) of sediment deposited since the impact, and was discovered in the 1960s during oil shale deposits exploration.
Age
When first identified, the age of the crater could only be roughly constrained between the age of the impacted rocks (the target) and the age of overlying sediments. The target rocks date from the Cenomanian (98.9 to 93.5 million years ago) and Turonian (93.5 to 89 million years ago) epochs. Bore samples of sediments overlying the crater contain fossils dating from the Paleocene epoch, 66 to 54.8 million years ago. The age of the crater was thus constrained to between 54 and 98 million years.
Subsequent radiometric dating reduced the uncertainty. The concentration of U
238 decay products in impact glasses from the crater were used to derive an age of 65.04 ± 1.10 million years. Analysis of argon radioactive decay products yielded an age of 65.17 ± 0.64 million years.[4] These ages are similar to that of Chicxulub Crater which argon dating yielded an age of 66.043 ± 0.011 million years.
Radiometric dating places the Boltysh crater thousands of years after the Chicxulub crater, but an August 2010 study of unusually high abundances of ancient fern spores (fern spikes) suggests the Boltysh impact may have occurred several thousand years before Chicxulub.[5]
In June 2021, a new study estimated that Boltysh formed about 65.39 ± 0.14/0.16 million years ago, 650,000 years after the Chicxulub catastrophe, contradicting the conclusions of the 2010 study, and suggested that the fern spike was a result of the impact itself. The authors of the paper suggested that the impact may have disrupted recovery after the K/Pg extinction.[6]
References
- ^ a b Boltysh at EID
- ^ "Double meteorite strike 'caused dinosaur extinction". BBC News. 2010-08-27. Retrieved 2010-08-27.
- ^ "A Mysterious Craters Age May Add Clues to the Dinosaur Extinction".
- ^ Kelley, Simon P.; Gurov, Eugene (August 2002). "Boltysh, another end-Cretaceous impact". Meteoritics & Planetary Science. 37 (8): 1031–1043. doi:10.1111/j.1945-5100.2002.tb00875.x. ISSN 1086-9379.
- ^ Jolley, David; Gilmour, Iain; Gurov, Eugene; Kelley, Simon; Watson, Jonathan (September 2010). "Two large meteorite impacts at the Cretaceous-Paleogene boundary". Geology. 38 (9): 835–838. doi:10.1130/G31034.1. ISSN 1943-2682.
- ^ Pickersgill, Annemarie E.; Mark, Darren F.; Lee, Martin R.; Kelley, Simon P.; Jolley, David W. (2021-06-01). "The Boltysh impact structure: An early Danian impact event during recovery from the K-Pg mass extinction". Science Advances. 7 (25): eabe6530. doi:10.1126/sciadv.abe6530. ISSN 2375-2548. PMID 34144979.
Further reading
- Grieve, R. A. F., Reny, G., Gurov, E. P., & Ryabenko, V. A. (1987). The melt rocks of the Boltysh impact crater, Ukraine, USSR. Contributions to Mineralogy and Petrology, 96(1), 56–62.
- Grieve R.A.F., Reny G., Gurov, E.P., Ryabenko V. A. (1985), Impact Melt Rocks of the Boltysh Crater, Meteoritics, v. 20, p. 655
- Gurov, E. P., Kelley, S. P., Koeberl, C., & Dykan, N. I. (2006). Sediments and impact rocks filling the Boltysh impact crater. In Biological processes associated with impact events (pp. 335–358). Springer Berlin Heidelberg.
- Gurov E.P., Gurova H.P. (1985), Boltysh Astrobleme: Impact Crater Pattern with a Central Uplift, Lunar & Planetary Science XVI, pp. 310–311
- Jolley D., Gilmour I., Gurov E., Kelley S., Watson J. (2010) Two large meteorite impacts at the Cretaceous-Paleogene boundary Geology September 2010, v. 38, pp. 835–838, doi:10.1130/G31034.1
- Kashkarov L.L., Nazarov M.A., Lorents K.A., Kalinina G.V., Kononkova N.N. (1999), The Track Age of the Boltysh Impact Structure, Astronomicheskii Vestnik, v. 33, p. 253
- Kelley S.P., Gurov E. (2002), The Boltysh, another end-Cretaceous impact, Meteoritics & Planetary Science, v. 37, pp. 1031–1043
