Cosmic-impact event in lake sediments from Central Europe postdates the Laacher See eruption and marks onset of the Younger Dryas

Kletetschka, Günther; Vondrák, D.; Hrubá, J.; Procházka, V.; Nábělek, Ladislav; Svitavská-Svobodová, Helena; Bobek, Přemysl; Hořická, Zuzana; Kadlec, Jaroslav; Takáč, M.; Stuchlík, Evžen

doi:https://dx.doi.org/10.1086/699869

Number of the records: 1

Cosmic-impact event in lake sediments from Central Europe postdates the Laacher See eruption and marks onset of the Younger Dryas

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SYSNO ASEP	0493827
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Cosmic-impact event in lake sediments from Central Europe postdates the Laacher See eruption and marks onset of the Younger Dryas
Author(s)	Kletetschka, Günther (GLU-S)_{RID, SAI, ORCID} Vondrák, D. (CZ) Hrubá, J. (CZ) Procházka, V. (CZ) Nábělek, Ladislav (GLU-S)_{RID, SAI} Svitavská-Svobodová, Helena (BU-J)_{RID, ORCID} Bobek, Přemysl (BU-J)_{ORCID, SAI} Hořická, Zuzana (BC-A)_RID Kadlec, Jaroslav (GFU-E)_{ORCID, RID} Takáč, M. (CZ) Stuchlík, Evžen (BC-A)_{RID, ORCID}
Source Title	Journal of Geology. - : University of Chicago Press - ISSN 0022-1376 Roč. 126, č. 6 (2018), s. 561-575
Number of pages	15 s.
Publication form	Print - P
Language	eng - English
Country	US - United States
Keywords	biomass-burning episode ; 4 continents ; NE-Germany ; black mat ; boundary ; volcano ; tephra ; hypothesis ; spherules ; climate
Subject RIV	DB - Geology ; Mineralogy
OECD category	Geology
Subject RIV - cooperation	Biology Centre (since 2006) - Hydrology ; Limnology
R&D Projects	GA17-05935S GA ČR - Czech Science Foundation (CSF)
Institutional support	GLU-S - RVO:67985831 ; BU-J - RVO:67985939 ; BC-A - RVO:60077344 ; GFU-E - RVO:67985530
UT WOS	000449866400001
EID SCOPUS	85055477893
DOI	10.1086/699869
Annotation	The Younger Dryas (YD) climate episode (similar to 12,850-11,650 calendar years before present [cal BP]) is an event recorded widely across the Northern Hemisphere. We conducted multiple analyses at high resolution of a YD-age sedimentary sequence from Stara Jimka, a paleolake in the Bohemian Forest, Czech Republic. Age-depth modeling indicates that a central European warming trend was interrupted at similar to 13,020 +/- 110 cal BP by the sudden onset of cooling (<20 y) known as the Gerzensee climate oscillation and marked by the deposition of fine-grained sediment at this location. That cooling episode ended at similar to 13,001 +/- 66 cal BP and was followed by a similar to 121-y-long warming trend. After that, the Laacher See tephra depositional event, dating to similar to 12,820 +/- 20 cal BP, continued an overall warming trend. The composition of Laacher See volcanic tephra in this section likely corresponds to the middle eruption sequence. Finally, the deposition of glassy microspherules marked the onset of the YD climate change at 12,755 +/- 92 cal BP. The sequence across the YD onset is marked by (1) a peak in glassy microspherules (117,000/kg), (2) a peak in framboidal spherules (14,000/kg), (3) significant changes in the lake's weathering proxies, and (4) major changes in fauna and flora, showing a shift to unfavorable environmental conditions (decrease in temperature and lake trophy status). Collectively, this evidence is consistent with the YD impact hypothesis and evidence of one or more cosmic airburst events occurring at this time.
Workplace	Geophysical Institute
Contact	Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028
Year of Publishing	2019

Number of the records: 1