The last glaciation in the headwater area of the Xiaokelanhe River, Chinese Altai: Evidence from Be-10 exposure-ages
The timing and extent of the last glaciation in the Altai Mountains are key to understanding climate change in this critical region. However, robust glacial chronologies are sparse across the Altai Mountains, especially in the Chinese Altai, impeding the correlation of glacial events and examination...
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Online Access: | http://ir.ieecas.cn/handle/361006/12664 https://doi.org/10.1016/j.quageo.2020.101054 |
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ftchinacascieeca:oai:ir.ieecas.cn:361006/12664 2023-06-11T04:13:48+02:00 The last glaciation in the headwater area of the Xiaokelanhe River, Chinese Altai: Evidence from Be-10 exposure-ages Dong, Guocheng Zhou, Weijian Fu, Yunchong Zhang, Li Zhao, Guoqing Li, Ming 2020-03-01 http://ir.ieecas.cn/handle/361006/12664 https://doi.org/10.1016/j.quageo.2020.101054 英语 eng ELSEVIER SCI LTD QUATERNARY GEOCHRONOLOGY http://ir.ieecas.cn/handle/361006/12664 doi:10.1016/j.quageo.2020.101054 Last glaciation Be-10 surface exposure dating Xiaokelanhe river basin Altai mountains LATE PLEISTOCENE GLACIATIONS SURFACE EXPOSURE TIAN-SHAN QUATERNARY GLACIATIONS MIDLATITUDE WESTERLIES TIBETAN PLATEAU SUMMER MONSOON NORTH-ATLANTIC MOUNT JAGGANG LABRADOR SEA Physical Geography Geology Geography Physical Geosciences Multidisciplinary 期刊论文 2020 ftchinacascieeca https://doi.org/10.1016/j.quageo.2020.101054 2023-05-08T13:24:11Z The timing and extent of the last glaciation in the Altai Mountains are key to understanding climate change in this critical region. However, robust glacial chronologies are sparse across the Altai Mountains, especially in the Chinese Altai, impeding the correlation of glacial events and examination of the possible climate forcing mechanisms. Here, we report twenty new Be-10 exposure-ages obtained from two moraines in the headwater area of the Xiaokelanhe River, Chinese Altai. The inner latero-frontal moraine yields exposure-ages ranging from 16.60 +/- 1.00 to 20.41 +/- 1.15 ka (n = 5), reflecting a limited advance during the global Last Glacial Maximum (LGM). The morpho-stratigraphically older moraine remnants have exposure-ages of 14.36 +/- 0.94-38.98 +/- 2.23 ka (n = 15). The tentatively determined moraine age of 34.10 +/- 4.99 ka suggests that the local LGM in the Xiaokelanhe River likely occurred during Marine Isotope Stage (MIS) 3 or earlier. From a compilation of the 20 new, and 79 previously published exposure-ages, we observe at least three distinct glacial events during the last glacial, with the local LGM occurring prior to MIS 2. A comparison between the timing of glacial activities and climate proxies suggests a potential combination of summer solar insolation, North Atlantic climate oscillations, and atmospheric CO2 levels, as triggers for glacial movements during the last glacial cycle. Precipitation delivered by the mid-latitude westerlies may have also contributed to glacial advances during MIS 3. These correlations remain tentative however, due to limited chronological control. Report Labrador Sea North Atlantic Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) Quaternary Geochronology 56 101054 |
institution |
Open Polar |
collection |
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchinacascieeca |
language |
English |
topic |
Last glaciation Be-10 surface exposure dating Xiaokelanhe river basin Altai mountains LATE PLEISTOCENE GLACIATIONS SURFACE EXPOSURE TIAN-SHAN QUATERNARY GLACIATIONS MIDLATITUDE WESTERLIES TIBETAN PLATEAU SUMMER MONSOON NORTH-ATLANTIC MOUNT JAGGANG LABRADOR SEA Physical Geography Geology Geography Physical Geosciences Multidisciplinary |
spellingShingle |
Last glaciation Be-10 surface exposure dating Xiaokelanhe river basin Altai mountains LATE PLEISTOCENE GLACIATIONS SURFACE EXPOSURE TIAN-SHAN QUATERNARY GLACIATIONS MIDLATITUDE WESTERLIES TIBETAN PLATEAU SUMMER MONSOON NORTH-ATLANTIC MOUNT JAGGANG LABRADOR SEA Physical Geography Geology Geography Physical Geosciences Multidisciplinary Dong, Guocheng Zhou, Weijian Fu, Yunchong Zhang, Li Zhao, Guoqing Li, Ming The last glaciation in the headwater area of the Xiaokelanhe River, Chinese Altai: Evidence from Be-10 exposure-ages |
topic_facet |
Last glaciation Be-10 surface exposure dating Xiaokelanhe river basin Altai mountains LATE PLEISTOCENE GLACIATIONS SURFACE EXPOSURE TIAN-SHAN QUATERNARY GLACIATIONS MIDLATITUDE WESTERLIES TIBETAN PLATEAU SUMMER MONSOON NORTH-ATLANTIC MOUNT JAGGANG LABRADOR SEA Physical Geography Geology Geography Physical Geosciences Multidisciplinary |
description |
The timing and extent of the last glaciation in the Altai Mountains are key to understanding climate change in this critical region. However, robust glacial chronologies are sparse across the Altai Mountains, especially in the Chinese Altai, impeding the correlation of glacial events and examination of the possible climate forcing mechanisms. Here, we report twenty new Be-10 exposure-ages obtained from two moraines in the headwater area of the Xiaokelanhe River, Chinese Altai. The inner latero-frontal moraine yields exposure-ages ranging from 16.60 +/- 1.00 to 20.41 +/- 1.15 ka (n = 5), reflecting a limited advance during the global Last Glacial Maximum (LGM). The morpho-stratigraphically older moraine remnants have exposure-ages of 14.36 +/- 0.94-38.98 +/- 2.23 ka (n = 15). The tentatively determined moraine age of 34.10 +/- 4.99 ka suggests that the local LGM in the Xiaokelanhe River likely occurred during Marine Isotope Stage (MIS) 3 or earlier. From a compilation of the 20 new, and 79 previously published exposure-ages, we observe at least three distinct glacial events during the last glacial, with the local LGM occurring prior to MIS 2. A comparison between the timing of glacial activities and climate proxies suggests a potential combination of summer solar insolation, North Atlantic climate oscillations, and atmospheric CO2 levels, as triggers for glacial movements during the last glacial cycle. Precipitation delivered by the mid-latitude westerlies may have also contributed to glacial advances during MIS 3. These correlations remain tentative however, due to limited chronological control. |
format |
Report |
author |
Dong, Guocheng Zhou, Weijian Fu, Yunchong Zhang, Li Zhao, Guoqing Li, Ming |
author_facet |
Dong, Guocheng Zhou, Weijian Fu, Yunchong Zhang, Li Zhao, Guoqing Li, Ming |
author_sort |
Dong, Guocheng |
title |
The last glaciation in the headwater area of the Xiaokelanhe River, Chinese Altai: Evidence from Be-10 exposure-ages |
title_short |
The last glaciation in the headwater area of the Xiaokelanhe River, Chinese Altai: Evidence from Be-10 exposure-ages |
title_full |
The last glaciation in the headwater area of the Xiaokelanhe River, Chinese Altai: Evidence from Be-10 exposure-ages |
title_fullStr |
The last glaciation in the headwater area of the Xiaokelanhe River, Chinese Altai: Evidence from Be-10 exposure-ages |
title_full_unstemmed |
The last glaciation in the headwater area of the Xiaokelanhe River, Chinese Altai: Evidence from Be-10 exposure-ages |
title_sort |
last glaciation in the headwater area of the xiaokelanhe river, chinese altai: evidence from be-10 exposure-ages |
publisher |
ELSEVIER SCI LTD |
publishDate |
2020 |
url |
http://ir.ieecas.cn/handle/361006/12664 https://doi.org/10.1016/j.quageo.2020.101054 |
genre |
Labrador Sea North Atlantic |
genre_facet |
Labrador Sea North Atlantic |
op_relation |
QUATERNARY GEOCHRONOLOGY http://ir.ieecas.cn/handle/361006/12664 doi:10.1016/j.quageo.2020.101054 |
op_doi |
https://doi.org/10.1016/j.quageo.2020.101054 |
container_title |
Quaternary Geochronology |
container_volume |
56 |
container_start_page |
101054 |
_version_ |
1768391140311040000 |