Evaluating the paleoclimatic significance of clay mineral records from a late Pleistocene loess-paleosol section of the Ili Basin, Central Asia
In this study, we present clay mineral records from a late Pleistocene loess-paleosol sequence in the Ili Basin, Central Asia, and assess their significance for paleoclimatic reconstruction. The results show that the clay minerals are mainly illite (average 60%) and chlorite (28%), with minor kaolin...
Published in: | Quaternary Research |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2018
|
Subjects: | |
Online Access: | http://ir.ieecas.cn/handle/361006/5143 https://doi.org/10.1017/qua.2017.58 |
id |
ftchinacascieeca:oai:ir.ieecas.cn:361006/5143 |
---|---|
record_format |
openpolar |
spelling |
ftchinacascieeca:oai:ir.ieecas.cn:361006/5143 2023-06-11T04:12:19+02:00 Evaluating the paleoclimatic significance of clay mineral records from a late Pleistocene loess-paleosol section of the Ili Basin, Central Asia Li, Yue Song, Yougui Zeng, Mengxiu Lin, Weiwei Orozbaev, Rustam Cheng, Liangqing Chen, Xinli Halmurat, Tiliwaldi 2018-05-01 http://ir.ieecas.cn/handle/361006/5143 https://doi.org/10.1017/qua.2017.58 英语 eng QUATERNARY RESEARCH http://ir.ieecas.cn/handle/361006/5143 doi:10.1017/qua.2017.58 Ili Loess Clay Mineral Genesis Paleoclimate Science & Technology Physical Sciences GREENLAND ICE CORE LATE QUATERNARY LOESS GRAIN-SIZE ENVIRONMENTAL SIGNIFICANCE TIANSHAN MOUNTAINS MONSOON EVOLUTION TIBETAN PLATEAU CLIMATIC-CHANGE NORTHERN CHINA MCMURDO SOUND Physical Geography Geology Geography Physical Geosciences Multidisciplinary Article 期刊论文 2018 ftchinacascieeca https://doi.org/10.1017/qua.2017.58 2023-05-08T13:22:40Z In this study, we present clay mineral records from a late Pleistocene loess-paleosol sequence in the Ili Basin, Central Asia, and assess their significance for paleoclimatic reconstruction. The results show that the clay minerals are mainly illite (average 60%) and chlorite (28%), with minor kaolinite (9%) and smectite (3%). Illite was of detrital origin with no obvious modification to its crystal structure. Increases in illite content in the loess are ascribed to wind intensity rather than pedogenesis. High proportions of illite in the clay fraction, and of muscovite in the bulk samples of the paleosol units, may lead to an overestimation of the weathering intensity. Kaolinite was likely inherited from the sedimentary rocks, while chlorite might have been inherited from both sedimentary and metamorphic rocks. The paleoclimatic signals of kaolinite and chlorite were unclear, due to reworking by both fluvial and eolian systems. Smectite was more likely formed by the transformation of biotite and illite, and its variation in the loess sequence was also controlled by wind intensity; this was largely due to aggregation and is unlikely to reflect moisture changes. Although the interpretation of paleoclimate evolution may contain some uncertainties, clay mineralogy does provide the possibility of tracing dust provenance. Article in Journal/Newspaper Greenland Greenland ice core ice core McMurdo Sound Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) McMurdo Sound Greenland Quaternary Research 89 3 660 673 |
institution |
Open Polar |
collection |
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchinacascieeca |
language |
English |
topic |
Ili Loess Clay Mineral Genesis Paleoclimate Science & Technology Physical Sciences GREENLAND ICE CORE LATE QUATERNARY LOESS GRAIN-SIZE ENVIRONMENTAL SIGNIFICANCE TIANSHAN MOUNTAINS MONSOON EVOLUTION TIBETAN PLATEAU CLIMATIC-CHANGE NORTHERN CHINA MCMURDO SOUND Physical Geography Geology Geography Physical Geosciences Multidisciplinary |
spellingShingle |
Ili Loess Clay Mineral Genesis Paleoclimate Science & Technology Physical Sciences GREENLAND ICE CORE LATE QUATERNARY LOESS GRAIN-SIZE ENVIRONMENTAL SIGNIFICANCE TIANSHAN MOUNTAINS MONSOON EVOLUTION TIBETAN PLATEAU CLIMATIC-CHANGE NORTHERN CHINA MCMURDO SOUND Physical Geography Geology Geography Physical Geosciences Multidisciplinary Li, Yue Song, Yougui Zeng, Mengxiu Lin, Weiwei Orozbaev, Rustam Cheng, Liangqing Chen, Xinli Halmurat, Tiliwaldi Evaluating the paleoclimatic significance of clay mineral records from a late Pleistocene loess-paleosol section of the Ili Basin, Central Asia |
topic_facet |
Ili Loess Clay Mineral Genesis Paleoclimate Science & Technology Physical Sciences GREENLAND ICE CORE LATE QUATERNARY LOESS GRAIN-SIZE ENVIRONMENTAL SIGNIFICANCE TIANSHAN MOUNTAINS MONSOON EVOLUTION TIBETAN PLATEAU CLIMATIC-CHANGE NORTHERN CHINA MCMURDO SOUND Physical Geography Geology Geography Physical Geosciences Multidisciplinary |
description |
In this study, we present clay mineral records from a late Pleistocene loess-paleosol sequence in the Ili Basin, Central Asia, and assess their significance for paleoclimatic reconstruction. The results show that the clay minerals are mainly illite (average 60%) and chlorite (28%), with minor kaolinite (9%) and smectite (3%). Illite was of detrital origin with no obvious modification to its crystal structure. Increases in illite content in the loess are ascribed to wind intensity rather than pedogenesis. High proportions of illite in the clay fraction, and of muscovite in the bulk samples of the paleosol units, may lead to an overestimation of the weathering intensity. Kaolinite was likely inherited from the sedimentary rocks, while chlorite might have been inherited from both sedimentary and metamorphic rocks. The paleoclimatic signals of kaolinite and chlorite were unclear, due to reworking by both fluvial and eolian systems. Smectite was more likely formed by the transformation of biotite and illite, and its variation in the loess sequence was also controlled by wind intensity; this was largely due to aggregation and is unlikely to reflect moisture changes. Although the interpretation of paleoclimate evolution may contain some uncertainties, clay mineralogy does provide the possibility of tracing dust provenance. |
format |
Article in Journal/Newspaper |
author |
Li, Yue Song, Yougui Zeng, Mengxiu Lin, Weiwei Orozbaev, Rustam Cheng, Liangqing Chen, Xinli Halmurat, Tiliwaldi |
author_facet |
Li, Yue Song, Yougui Zeng, Mengxiu Lin, Weiwei Orozbaev, Rustam Cheng, Liangqing Chen, Xinli Halmurat, Tiliwaldi |
author_sort |
Li, Yue |
title |
Evaluating the paleoclimatic significance of clay mineral records from a late Pleistocene loess-paleosol section of the Ili Basin, Central Asia |
title_short |
Evaluating the paleoclimatic significance of clay mineral records from a late Pleistocene loess-paleosol section of the Ili Basin, Central Asia |
title_full |
Evaluating the paleoclimatic significance of clay mineral records from a late Pleistocene loess-paleosol section of the Ili Basin, Central Asia |
title_fullStr |
Evaluating the paleoclimatic significance of clay mineral records from a late Pleistocene loess-paleosol section of the Ili Basin, Central Asia |
title_full_unstemmed |
Evaluating the paleoclimatic significance of clay mineral records from a late Pleistocene loess-paleosol section of the Ili Basin, Central Asia |
title_sort |
evaluating the paleoclimatic significance of clay mineral records from a late pleistocene loess-paleosol section of the ili basin, central asia |
publishDate |
2018 |
url |
http://ir.ieecas.cn/handle/361006/5143 https://doi.org/10.1017/qua.2017.58 |
geographic |
McMurdo Sound Greenland |
geographic_facet |
McMurdo Sound Greenland |
genre |
Greenland Greenland ice core ice core McMurdo Sound |
genre_facet |
Greenland Greenland ice core ice core McMurdo Sound |
op_relation |
QUATERNARY RESEARCH http://ir.ieecas.cn/handle/361006/5143 doi:10.1017/qua.2017.58 |
op_doi |
https://doi.org/10.1017/qua.2017.58 |
container_title |
Quaternary Research |
container_volume |
89 |
container_issue |
3 |
container_start_page |
660 |
op_container_end_page |
673 |
_version_ |
1768388071264354304 |