TY - JOUR

T1 - Glacier dynamics in the southern part of East Siberia (Russia) from the final part of the LGM to the present based on from biogeochemical proxies from bottom sediments of proglacial lakes

AU - Stepanova, O. G.

AU - Trunova, V. A.

AU - Osipov, E. Yu

AU - Kononov, E. E.

AU - Vorobyeva, S. S.

AU - Parkhomchuk, E. V.

AU - Kalinkin, P. N.

AU - Vorobyeva, E. E.

AU - Vershinin, K. E.

AU - Rastigeev, S. A.

AU - Fedotov, A. P.

N1 - Publisher Copyright: © 2019 Elsevier Ltd and INQUA

PY - 2019/7/30

Y1 - 2019/7/30

N2 - In the present study, we have reconstructed glacier dynamics based on the high (1–0.5 mm) resolution X-ray fluorescence spectrometry scanning, the Fourier-transform infrared technique and 14 C-dating used in the analyses of the lake bottom sediments, fluvioglacial deposits and a peat bog situated on East Siberian Mountains (East Sayan, Baikal, Barguzin and Kodar Ridges) between 51.723°N, 100.601°E and 56.885°N, 117.580°E. We have found what the largest glacier deposits on the Baikal shoreline, so-called Tompuda end moraine, formed in two stages. The first stage occurred until ca. 12 cal ka BP; then, there was a short pause. The second stage ended by 9.5 cal ka BP. Azarova glacier (Kodar Ridge) retreated upwards the Kodar Ridge by ca. 11 cal ka BP. It may indicate that the Bølling-Allerød warming was very evident, and it was a trigger for these deglacial events in East Siberia. It is most likely that “remains” of the Late Pleistocene glaciers were cardinally shrunk or fully disappeared during the Holocene Thermal Optimum in the southern part of East Siberia. Climate conditions were suitable for glacier formation after 3 cal ka BP. However, if there were new glaciers in the Middle Holocene, their sizes were likely to be less than 1 km 2 . For this reason, these glaciers should have completely melted during the Roman and Medieval Warm Periods. It is most likely, small glaciers observed at present in the south of East Siberia were mainly formed during the Little Ice Age.

AB - In the present study, we have reconstructed glacier dynamics based on the high (1–0.5 mm) resolution X-ray fluorescence spectrometry scanning, the Fourier-transform infrared technique and 14 C-dating used in the analyses of the lake bottom sediments, fluvioglacial deposits and a peat bog situated on East Siberian Mountains (East Sayan, Baikal, Barguzin and Kodar Ridges) between 51.723°N, 100.601°E and 56.885°N, 117.580°E. We have found what the largest glacier deposits on the Baikal shoreline, so-called Tompuda end moraine, formed in two stages. The first stage occurred until ca. 12 cal ka BP; then, there was a short pause. The second stage ended by 9.5 cal ka BP. Azarova glacier (Kodar Ridge) retreated upwards the Kodar Ridge by ca. 11 cal ka BP. It may indicate that the Bølling-Allerød warming was very evident, and it was a trigger for these deglacial events in East Siberia. It is most likely that “remains” of the Late Pleistocene glaciers were cardinally shrunk or fully disappeared during the Holocene Thermal Optimum in the southern part of East Siberia. Climate conditions were suitable for glacier formation after 3 cal ka BP. However, if there were new glaciers in the Middle Holocene, their sizes were likely to be less than 1 km 2 . For this reason, these glaciers should have completely melted during the Roman and Medieval Warm Periods. It is most likely, small glaciers observed at present in the south of East Siberia were mainly formed during the Little Ice Age.

KW - Baikalsky Ridge

KW - Barguzinsky Ridge

KW - Bottom sediments

KW - East Sayan Ridge

KW - East Siberia

KW - Glaciers

KW - Kodar Ridge

KW - Proglacial lakes

KW - CLIMATE CHANGES

KW - MOUNTAIN GLACIERS

KW - RECONSTRUCTION

KW - RESOLUTION

KW - HOLOCENE

KW - TEMPERATURE VARIABILITY

KW - ALPINE GLACIERS

KW - KODAR MOUNTAINS

KW - BAIKAL

KW - LATE PLEISTOCENE

UR - http://www.scopus.com/inward/record.url?scp=85062642517&partnerID=8YFLogxK

U2 - 10.1016/j.quaint.2019.03.003

DO - 10.1016/j.quaint.2019.03.003

M3 - Article

AN - SCOPUS:85062642517

VL - 524

SP - 4

EP - 12

JO - Quaternary International

JF - Quaternary International

SN - 1040-6182

ER -