Impact processes, permafrost dynamics, and climate and environmental variability in the terrestrial Arctic as inferred from the unique 3.6 Myr record of Lake El'gygytgyn, Far East Russia – A review
© 2016 Elsevier LtdLake El'gygytgyn in Far East Russia is a 3.6 Myr old impact crater lake. Located in an area that has never been affected by Cenozoic glaciations nor desiccation, the unique sediment record of the lake represents the longest continuous sediment archive of the terrestrial Arcti...
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Format: | Article in Journal/Newspaper |
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2016
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Online Access: | http://dspace.kpfu.ru/xmlui/handle/net/114193 |
id |
ftkazanuniv:oai:dspace.kpfu.ru:net/114193 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Kazan Federal University Digital Repository |
op_collection_id |
ftkazanuniv |
language |
unknown |
topic |
Arctic amplification ICDP Impact history Lake El'gygytgyn Mid-Pliocene warmth Permafrost dynamics Pliocene/Pleistocene transition Super-interglacials |
spellingShingle |
Arctic amplification ICDP Impact history Lake El'gygytgyn Mid-Pliocene warmth Permafrost dynamics Pliocene/Pleistocene transition Super-interglacials Wennrich V. Andreev A. Tarasov P. Fedorov G. Zhao W. Gebhardt C. Meyer-Jacob C. Snyder J. Nowaczyk N. Schwamborn G. Chapligin B. Anderson P. Lozhkin A. Minyuk P. Koeberl C. Melles M. Impact processes, permafrost dynamics, and climate and environmental variability in the terrestrial Arctic as inferred from the unique 3.6 Myr record of Lake El'gygytgyn, Far East Russia – A review |
topic_facet |
Arctic amplification ICDP Impact history Lake El'gygytgyn Mid-Pliocene warmth Permafrost dynamics Pliocene/Pleistocene transition Super-interglacials |
description |
© 2016 Elsevier LtdLake El'gygytgyn in Far East Russia is a 3.6 Myr old impact crater lake. Located in an area that has never been affected by Cenozoic glaciations nor desiccation, the unique sediment record of the lake represents the longest continuous sediment archive of the terrestrial Arctic. The surrounding crater is the only impact structure on Earth developed in mostly acid volcanic rocks. Recent studies on the impactite, permafrost, and sediment sequences recovered within the framework of the ICDP “El'gygytgyn Drilling Project” and multiple pre-site surveys yielded new insight into the bedrock origin and cratering processes as well as permafrost dynamics and the climate and environmental history of the terrestrial Arctic back to the mid-Pliocene. Results from the impact rock section recovered during the deep drilling clearly confirm the impact genesis of the El'gygytgyn crater, but indicate an only very reduced fallback impactite sequence without larger coherent melt bodies. Isotope and element data of impact melt samples indicate a F-type asteroid of mixed composition or an ordinary chondrite as the likely impactor. The impact event caused a long-lasting hydrothermal activity in the crater that is assumed to have persisted for c. 300 kyr. Geochemical and microbial analyses of the permafrost core indicate a subaquatic formation of the lower part during lake-level highstand, but a subaerial genesis of the upper part after a lake-level drop after the Allerød. The isotope signal and ion compositions of ground ice is overprinted by several thaw-freeze cycles due to variations in the talik underneath the lake. Modeling results suggest a modern permafrost thickness in the crater of c. 340 m, and further confirm a pervasive character of the talik below Lake El'gygytgyn. The lake sediment sequences shed new leight into the Pliocene and Pleistocene climate and environmental evolution of the Arctic. During the mid-Pliocene, significantly warmer and wetter climatic conditions in western Beringia than today enabled dense boreal forests to grow around Lake El'gygytgyn and, in combination with a higher nutrient flux into the lake, promoted primary production. The exceptional warmth during the mid-Pliocene is in accordance with other marine and terrestrial records from the Arctic and indicates a period of enhanced “Arctic amplification”. The favourable conditions during the mid-Pliocene were repeatedly interrupted by climate deteriorations, e.g., during Marine Isotope Stage (MIS) M2, when pollen data and sediment proxies indicate a major cooling and the onset of local permafrost around the lake. A gradual vegetation change after c. 3.0 Ma points to the onset of a long-term cooling trend during the Late Pliocene that culminated in major temperature drops, first during MIS G6, and later during MIS 104. These cold events coincide with the onset of an intensified Northern Hemisphere (NH) glaciation and the largest extent of the Cordilleran Ice Sheet, respectively. After the Pliocene/Pleistocene transition, local vegetation and primary production in Lake El'gygtygyn experienced a major change from relatively uniform conditions to a high-amplitude glacial-to-interglacial cyclicity that fluctuated on a dominant 41 kyr obliquity band, but changed to a 100 kyr eccentricity dominance during the Middle Pleistocene transition (MPT) at c. 1.2–0.6 Ma. Periods of exceptional warming in the Pleistocene record of Lake El'gygytgyn with dense boreal forests around and peaks of primary production in the lake are assigned to so-called “super-interglacial” periods. The occurrence of these super-interglacials well corresponds to collapses of the West Antarctic Ice Sheet (WAIS) recorded in ice-free periods in the ANDRILL core, which suggests strong intrahemispheric teleconnections presumably driven by changes in the thermocline ocean circulation. |
format |
Article in Journal/Newspaper |
author |
Wennrich V. Andreev A. Tarasov P. Fedorov G. Zhao W. Gebhardt C. Meyer-Jacob C. Snyder J. Nowaczyk N. Schwamborn G. Chapligin B. Anderson P. Lozhkin A. Minyuk P. Koeberl C. Melles M. |
author_facet |
Wennrich V. Andreev A. Tarasov P. Fedorov G. Zhao W. Gebhardt C. Meyer-Jacob C. Snyder J. Nowaczyk N. Schwamborn G. Chapligin B. Anderson P. Lozhkin A. Minyuk P. Koeberl C. Melles M. |
author_sort |
Wennrich V. |
title |
Impact processes, permafrost dynamics, and climate and environmental variability in the terrestrial Arctic as inferred from the unique 3.6 Myr record of Lake El'gygytgyn, Far East Russia – A review |
title_short |
Impact processes, permafrost dynamics, and climate and environmental variability in the terrestrial Arctic as inferred from the unique 3.6 Myr record of Lake El'gygytgyn, Far East Russia – A review |
title_full |
Impact processes, permafrost dynamics, and climate and environmental variability in the terrestrial Arctic as inferred from the unique 3.6 Myr record of Lake El'gygytgyn, Far East Russia – A review |
title_fullStr |
Impact processes, permafrost dynamics, and climate and environmental variability in the terrestrial Arctic as inferred from the unique 3.6 Myr record of Lake El'gygytgyn, Far East Russia – A review |
title_full_unstemmed |
Impact processes, permafrost dynamics, and climate and environmental variability in the terrestrial Arctic as inferred from the unique 3.6 Myr record of Lake El'gygytgyn, Far East Russia – A review |
title_sort |
impact processes, permafrost dynamics, and climate and environmental variability in the terrestrial arctic as inferred from the unique 3.6 myr record of lake el'gygytgyn, far east russia – a review |
publishDate |
2016 |
url |
http://dspace.kpfu.ru/xmlui/handle/net/114193 |
long_lat |
ENVELOPE(146.601,146.601,59.667,59.667) ENVELOPE(-60.667,-60.667,-62.983,-62.983) |
geographic |
Arctic Antarctic West Antarctic Ice Sheet Talik Crater Lake |
geographic_facet |
Arctic Antarctic West Antarctic Ice Sheet Talik Crater Lake |
genre |
Antarc* Antarctic Arctic Ice Ice Sheet permafrost Beringia |
genre_facet |
Antarc* Antarctic Arctic Ice Ice Sheet permafrost Beringia |
op_source |
SCOPUS02773791-2016-147-SID84962862643 |
op_relation |
Quaternary Science Reviews 221 147 http://dspace.kpfu.ru/xmlui/bitstream/net/114193/1/SCOPUS02773791-2016-147-SID84962862643-p1.pdf 0277-3791 http://dspace.kpfu.ru/xmlui/handle/net/114193 |
_version_ |
1766270148907368448 |
spelling |
ftkazanuniv:oai:dspace.kpfu.ru:net/114193 2023-05-15T14:00:48+02:00 Impact processes, permafrost dynamics, and climate and environmental variability in the terrestrial Arctic as inferred from the unique 3.6 Myr record of Lake El'gygytgyn, Far East Russia – A review Wennrich V. Andreev A. Tarasov P. Fedorov G. Zhao W. Gebhardt C. Meyer-Jacob C. Snyder J. Nowaczyk N. Schwamborn G. Chapligin B. Anderson P. Lozhkin A. Minyuk P. Koeberl C. Melles M. 2016 http://dspace.kpfu.ru/xmlui/handle/net/114193 unknown Quaternary Science Reviews 221 147 http://dspace.kpfu.ru/xmlui/bitstream/net/114193/1/SCOPUS02773791-2016-147-SID84962862643-p1.pdf 0277-3791 http://dspace.kpfu.ru/xmlui/handle/net/114193 SCOPUS02773791-2016-147-SID84962862643 Arctic amplification ICDP Impact history Lake El'gygytgyn Mid-Pliocene warmth Permafrost dynamics Pliocene/Pleistocene transition Super-interglacials Article 2016 ftkazanuniv 2022-01-01T09:39:28Z © 2016 Elsevier LtdLake El'gygytgyn in Far East Russia is a 3.6 Myr old impact crater lake. Located in an area that has never been affected by Cenozoic glaciations nor desiccation, the unique sediment record of the lake represents the longest continuous sediment archive of the terrestrial Arctic. The surrounding crater is the only impact structure on Earth developed in mostly acid volcanic rocks. Recent studies on the impactite, permafrost, and sediment sequences recovered within the framework of the ICDP “El'gygytgyn Drilling Project” and multiple pre-site surveys yielded new insight into the bedrock origin and cratering processes as well as permafrost dynamics and the climate and environmental history of the terrestrial Arctic back to the mid-Pliocene. Results from the impact rock section recovered during the deep drilling clearly confirm the impact genesis of the El'gygytgyn crater, but indicate an only very reduced fallback impactite sequence without larger coherent melt bodies. Isotope and element data of impact melt samples indicate a F-type asteroid of mixed composition or an ordinary chondrite as the likely impactor. The impact event caused a long-lasting hydrothermal activity in the crater that is assumed to have persisted for c. 300 kyr. Geochemical and microbial analyses of the permafrost core indicate a subaquatic formation of the lower part during lake-level highstand, but a subaerial genesis of the upper part after a lake-level drop after the Allerød. The isotope signal and ion compositions of ground ice is overprinted by several thaw-freeze cycles due to variations in the talik underneath the lake. Modeling results suggest a modern permafrost thickness in the crater of c. 340 m, and further confirm a pervasive character of the talik below Lake El'gygytgyn. The lake sediment sequences shed new leight into the Pliocene and Pleistocene climate and environmental evolution of the Arctic. During the mid-Pliocene, significantly warmer and wetter climatic conditions in western Beringia than today enabled dense boreal forests to grow around Lake El'gygytgyn and, in combination with a higher nutrient flux into the lake, promoted primary production. The exceptional warmth during the mid-Pliocene is in accordance with other marine and terrestrial records from the Arctic and indicates a period of enhanced “Arctic amplification”. The favourable conditions during the mid-Pliocene were repeatedly interrupted by climate deteriorations, e.g., during Marine Isotope Stage (MIS) M2, when pollen data and sediment proxies indicate a major cooling and the onset of local permafrost around the lake. A gradual vegetation change after c. 3.0 Ma points to the onset of a long-term cooling trend during the Late Pliocene that culminated in major temperature drops, first during MIS G6, and later during MIS 104. These cold events coincide with the onset of an intensified Northern Hemisphere (NH) glaciation and the largest extent of the Cordilleran Ice Sheet, respectively. After the Pliocene/Pleistocene transition, local vegetation and primary production in Lake El'gygtygyn experienced a major change from relatively uniform conditions to a high-amplitude glacial-to-interglacial cyclicity that fluctuated on a dominant 41 kyr obliquity band, but changed to a 100 kyr eccentricity dominance during the Middle Pleistocene transition (MPT) at c. 1.2–0.6 Ma. Periods of exceptional warming in the Pleistocene record of Lake El'gygytgyn with dense boreal forests around and peaks of primary production in the lake are assigned to so-called “super-interglacial” periods. The occurrence of these super-interglacials well corresponds to collapses of the West Antarctic Ice Sheet (WAIS) recorded in ice-free periods in the ANDRILL core, which suggests strong intrahemispheric teleconnections presumably driven by changes in the thermocline ocean circulation. Article in Journal/Newspaper Antarc* Antarctic Arctic Ice Ice Sheet permafrost Beringia Kazan Federal University Digital Repository Arctic Antarctic West Antarctic Ice Sheet Talik ENVELOPE(146.601,146.601,59.667,59.667) Crater Lake ENVELOPE(-60.667,-60.667,-62.983,-62.983) |