Holocene climate change recorded by paleosoil profile in Hulun Buir Sandy Land
Zhao Yanzhuo,1, Xie Yuanyun,1,2, Kang Chunguo3, Chi Yunping2, Sun Lei1, Wu Peng1, Wei Zhenyu1
1.College of Geographic Science /, Harbin Normal University,Harbin 150025,China
2.Heilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regions, Harbin Normal University,Harbin 150025,China
沙地和沙漠是干旱半干旱地区重要的地质档案载体,记录着丰富的气候演化和沙漠变化信息,尤其是位于东亚温带季风区的呼伦贝尔沙地,蕴含着丰富的东亚季风和人类活动信息。然而受沙丘流动性影响及研究手段的匮乏,目前对于呼伦贝尔沙地全新世以来的气候信息知之甚少。本研究针对呼伦贝尔沙地两个典型风成砂-古土壤沉积序列,进行了多指标如粒度、磁化率、色度、地球化学和总有机碳(TOC)分析,同时结合岩性特征重建了呼伦贝尔沙地全新世以来的气候演化历史。结果表明:两个剖面古土壤层的细颗粒组分、磁化率、化学蚀变指数(CIA)、Rb/Sr、TOC呈高值,而(CaO+Na2O+MgO)/TiO2和亮度呈低值。此外,在6 356±31~2 235±51 cal. a BP和1 620±42~498±17 cal. a BP年龄阶段出现两个明显的变化趋势,指示了呼伦贝尔沙地气候向暖湿方向的逆转,且风成砂层(气候干冷)向古土壤层(气候暖湿)过渡是逐渐进行的,而由古土壤层(气候暖湿)向风成砂层(气候干冷)过渡是骤然变化的。通过与呼伦贝尔沙地古土壤年龄汇编对比,当前研究的古土壤发育年代与邻区的气候暖湿期对应较好,表明呼伦贝尔沙地的正逆演化过程受区域气候演化控制。沙地古土壤发育时间与太阳辐射高值相对应,表明太阳辐射驱动的东亚夏季风变化是呼伦贝尔沙地气候逆转的主要因素。此外,近2000年来人类活动的增强可能对风沙活动加剧造成了一定影响。
关键词:呼伦贝尔沙地
;
全新世
;
气候变化
;
风成砂-古土壤
Abstract
Sand-desert is an important geological archive carrier in arid and semi-arid regions, recording rich climate evolution and desert changes, especially in Hulun Buir Sandy Land, located in the East Asian temperate monsoon region, which contains rich information about the East Asian monsoon and human activities. However, due to the impact of sand dune mobility and the lack of research methods, little is known about the climate information of Hulun Buir Sandy Land since the Holocene. Therefore, based on the two typical aeolian sand-paleosol sedimentary sequences in Hulun Buir Sandy Land, this paper has carried out multiple indicators such as grain size, magnetic susceptibility, color, geochemistry and TOC analysis, and combined with lithological characteristics, reconstructed the climate evolution history of Hulun Buir Sandy Land since the Holocene. The results show that the fine particle composition, magnetic susceptibility, CIA, Rb/Sr and TOC of the paleosol layer in the two sections are high, while (CaO+Na2O+MgO)/TiO2 and brightness are low. In addition, there are two obvious change trends in the age stages of 6 356±31-2 235±51 cal. a BP and 1 620±42-498±17 cal. a BP, indicating that the climate of Hulun Buir Sandy Land is reversed to the warm and wet direction, and the transition from the aeolian sand layer (dry and cold climate) to the paleosol layer (warm and wet climate) is gradual, while the transition from the paleosol layer (warm and wet climate) to the aeolian sand layer (dry and cold climate) is sudden change. By comparing with the compilation of paleosol ages in Hulun Buir Sandy Land, the paleosol development ages studied at present correspond well with the warm and humid climate periods in the adjacent area, indicating that the positive and negative evolution process of Hulun Buir Sandy Land is controlled by the regional climate evolution. The development time of the ancient soil in the sandy land corresponds to the high value of solar radiation, indicating that the change of the East Asian summer monsoon driven by solar radiation is the main factor for the climate reversal in Hulun Buir Sandy Land. In addition, the intensification of human activities in the past 2 000 years may have had a certain impact on the intensification of sandstorm activities.
Zhao Yanzhuo, Xie Yuanyun, Kang Chunguo, Chi Yunping, Sun Lei, Wu Peng, Wei Zhenyu. Holocene climate change recorded by paleosoil profile in Hulun Buir Sandy Land. Journal of Desert Research[J], 2023, 43(5): 85-96 doi:10.7522/j.issn.1000-694X.2023.00021
X剖面由上下两层风成砂和中间一期古土壤组成(图2)。古土壤层顶部和底部的14C年龄为498±17 cal. a BP、1 620±42 cal. a BP(表1)。剖面的最顶层为现代土壤-风成砂层,中间为古土壤层,剖面最底部的风成砂可分为河湖沙和风成砂两部分,古土壤层和底部风成砂层之间夹杂着一层弱古土壤过渡层。
通常利用CIA(Chemical Index of Alteration,CIA=[Al2O3/(Al2O3+CaO*+Na2O+K2O)]×100,化学蚀变指数,摩尔数)来评价沉积物的化学风化程度[38]。风化程度的强弱与气候和环境的变化关系密切,化学风化程度增强通常与较高的温度和降水有关,反之亦然[38]。CIA值<50代表未风化,50~60代表弱风化,60~80代表中等风化,>80代表强风化[39]。呼伦贝尔沙地的两个风成砂-古土壤剖面CIA值的变化范围分别为44.34~59.45和33.17~58.79,具有弱风化强度(图4)。在同一剖面,古土壤层的CIA值高,说明在该层经历了暖湿的气候条件,化学风化作用较强;而风成砂层CIA值较低,指示在该层经历了相对冷干的气候条件和较弱的化学风化作用。Rb/Sr能够反映土壤湿度的变化,也是夏季风强度变化的主要标志[40-42]。因此,Rb/Sr值一般被用来作为夏季风强度的替代性指标[40-42]。(CaO+Na2O+MgO)/TiO2指标经常被用作化学风化水平的替代性指标[43]。由于受到气候变化的影响,相对稳定元素和易迁移元素会产生不同地球化学行为,因此利用Rb/Sr值和(CaO+Na2O+MgO)/TiO2值可以进行古气候变化的重建。在古土壤层Rb/Sr比值较高,(CaO+Na2O+MgO)/TiO2较低,指示了相对暖湿的气候条件;反之,在风成砂层指示了相对冷干的气候条件。
Fig.5
Comparison of the probability density curve of paleosol in Hulun Buir Sandy Land with the quantitative reconstruction of annual mean precipitation,annual mean temperature and 65°N solar radiation in Hulun Lake[6,54]
Response of dune mobility and pedogenesis to fluctuations in monsoon precipitation and human activity in the Hulunbuir dune field,northeastern China,since the last deglaciation
Variation of Rb/Sr ratios in the loess-paleosol sequences of central China during the last 130,000 years and their implications for monsoon paleoclimatology
Holocene precipitation and temperature variations in the East Asian Monsoonal Margin from pollen data from Hulun Lake in northeastern Inner Mongolia,China
Holocene climatic changes revealed by aeolian deposits from the Qinghai Lake area (northeastern Qinghai-Tibetan Plateau) and possible forcing mechanisms
Geochemical characteristics of Holocene loess-paleosol sequences in central Chinese Loess Plateau and their implications for East Asian monsoon evolution
Response of dune mobility and pedogenesis to fluctuations in monsoon precipitation and human activity in the Hulunbuir dune field,northeastern China,since the last deglaciation
... 图中灰色条带代表了两个剖面古土壤发育阶段Comparison of the probability density curve of paleosol in Hulun Buir Sandy Land with the quantitative reconstruction of annual mean precipitation,annual mean temperature and 65°N solar radiation in Hulun Lake[6,54]Fig.5
Early Proterozoic climates and plate motions inferred from major element chemistry of lutites
2
1982
... 通常利用CIA(Chemical Index of Alteration,CIA=[Al2O3/(Al2O3+CaO*+Na2O+K2O)]×100,化学蚀变指数,摩尔数)来评价沉积物的化学风化程度[38].风化程度的强弱与气候和环境的变化关系密切,化学风化程度增强通常与较高的温度和降水有关,反之亦然[38].CIA值<50代表未风化,50~60代表弱风化,60~80代表中等风化,>80代表强风化[39].呼伦贝尔沙地的两个风成砂-古土壤剖面CIA值的变化范围分别为44.34~59.45和33.17~58.79,具有弱风化强度(图4).在同一剖面,古土壤层的CIA值高,说明在该层经历了暖湿的气候条件,化学风化作用较强;而风成砂层CIA值较低,指示在该层经历了相对冷干的气候条件和较弱的化学风化作用.Rb/Sr能够反映土壤湿度的变化,也是夏季风强度变化的主要标志[40-42].因此,Rb/Sr值一般被用来作为夏季风强度的替代性指标[40-42].(CaO+Na2O+MgO)/TiO2指标经常被用作化学风化水平的替代性指标[43].由于受到气候变化的影响,相对稳定元素和易迁移元素会产生不同地球化学行为,因此利用Rb/Sr值和(CaO+Na2O+MgO)/TiO2值可以进行古气候变化的重建.在古土壤层Rb/Sr比值较高,(CaO+Na2O+MgO)/TiO2较低,指示了相对暖湿的气候条件;反之,在风成砂层指示了相对冷干的气候条件. ...
Unraveling the effects of potassium metasomatism in sedimentary rocks and paleosols,with implications for paleoweathering conditions and provenance
1
1995
... 通常利用CIA(Chemical Index of Alteration,CIA=[Al2O3/(Al2O3+CaO*+Na2O+K2O)]×100,化学蚀变指数,摩尔数)来评价沉积物的化学风化程度[38].风化程度的强弱与气候和环境的变化关系密切,化学风化程度增强通常与较高的温度和降水有关,反之亦然[38].CIA值<50代表未风化,50~60代表弱风化,60~80代表中等风化,>80代表强风化[39].呼伦贝尔沙地的两个风成砂-古土壤剖面CIA值的变化范围分别为44.34~59.45和33.17~58.79,具有弱风化强度(图4).在同一剖面,古土壤层的CIA值高,说明在该层经历了暖湿的气候条件,化学风化作用较强;而风成砂层CIA值较低,指示在该层经历了相对冷干的气候条件和较弱的化学风化作用.Rb/Sr能够反映土壤湿度的变化,也是夏季风强度变化的主要标志[40-42].因此,Rb/Sr值一般被用来作为夏季风强度的替代性指标[40-42].(CaO+Na2O+MgO)/TiO2指标经常被用作化学风化水平的替代性指标[43].由于受到气候变化的影响,相对稳定元素和易迁移元素会产生不同地球化学行为,因此利用Rb/Sr值和(CaO+Na2O+MgO)/TiO2值可以进行古气候变化的重建.在古土壤层Rb/Sr比值较高,(CaO+Na2O+MgO)/TiO2较低,指示了相对暖湿的气候条件;反之,在风成砂层指示了相对冷干的气候条件. ...
Variation of Rb/Sr ratios in the loess-paleosol sequences of central China during the last 130,000 years and their implications for monsoon paleoclimatology
2
1999
... 通常利用CIA(Chemical Index of Alteration,CIA=[Al2O3/(Al2O3+CaO*+Na2O+K2O)]×100,化学蚀变指数,摩尔数)来评价沉积物的化学风化程度[38].风化程度的强弱与气候和环境的变化关系密切,化学风化程度增强通常与较高的温度和降水有关,反之亦然[38].CIA值<50代表未风化,50~60代表弱风化,60~80代表中等风化,>80代表强风化[39].呼伦贝尔沙地的两个风成砂-古土壤剖面CIA值的变化范围分别为44.34~59.45和33.17~58.79,具有弱风化强度(图4).在同一剖面,古土壤层的CIA值高,说明在该层经历了暖湿的气候条件,化学风化作用较强;而风成砂层CIA值较低,指示在该层经历了相对冷干的气候条件和较弱的化学风化作用.Rb/Sr能够反映土壤湿度的变化,也是夏季风强度变化的主要标志[40-42].因此,Rb/Sr值一般被用来作为夏季风强度的替代性指标[40-42].(CaO+Na2O+MgO)/TiO2指标经常被用作化学风化水平的替代性指标[43].由于受到气候变化的影响,相对稳定元素和易迁移元素会产生不同地球化学行为,因此利用Rb/Sr值和(CaO+Na2O+MgO)/TiO2值可以进行古气候变化的重建.在古土壤层Rb/Sr比值较高,(CaO+Na2O+MgO)/TiO2较低,指示了相对暖湿的气候条件;反之,在风成砂层指示了相对冷干的气候条件. ...
Srontium isotopes in weathering profiles,deep-scasediments,and sedlimentary rocks
0
1969
西宁地区新近纪风尘堆积的元素组成特征及物源指示意义
2
2017
... 通常利用CIA(Chemical Index of Alteration,CIA=[Al2O3/(Al2O3+CaO*+Na2O+K2O)]×100,化学蚀变指数,摩尔数)来评价沉积物的化学风化程度[38].风化程度的强弱与气候和环境的变化关系密切,化学风化程度增强通常与较高的温度和降水有关,反之亦然[38].CIA值<50代表未风化,50~60代表弱风化,60~80代表中等风化,>80代表强风化[39].呼伦贝尔沙地的两个风成砂-古土壤剖面CIA值的变化范围分别为44.34~59.45和33.17~58.79,具有弱风化强度(图4).在同一剖面,古土壤层的CIA值高,说明在该层经历了暖湿的气候条件,化学风化作用较强;而风成砂层CIA值较低,指示在该层经历了相对冷干的气候条件和较弱的化学风化作用.Rb/Sr能够反映土壤湿度的变化,也是夏季风强度变化的主要标志[40-42].因此,Rb/Sr值一般被用来作为夏季风强度的替代性指标[40-42].(CaO+Na2O+MgO)/TiO2指标经常被用作化学风化水平的替代性指标[43].由于受到气候变化的影响,相对稳定元素和易迁移元素会产生不同地球化学行为,因此利用Rb/Sr值和(CaO+Na2O+MgO)/TiO2值可以进行古气候变化的重建.在古土壤层Rb/Sr比值较高,(CaO+Na2O+MgO)/TiO2较低,指示了相对暖湿的气候条件;反之,在风成砂层指示了相对冷干的气候条件. ...
... 通常利用CIA(Chemical Index of Alteration,CIA=[Al2O3/(Al2O3+CaO*+Na2O+K2O)]×100,化学蚀变指数,摩尔数)来评价沉积物的化学风化程度[38].风化程度的强弱与气候和环境的变化关系密切,化学风化程度增强通常与较高的温度和降水有关,反之亦然[38].CIA值<50代表未风化,50~60代表弱风化,60~80代表中等风化,>80代表强风化[39].呼伦贝尔沙地的两个风成砂-古土壤剖面CIA值的变化范围分别为44.34~59.45和33.17~58.79,具有弱风化强度(图4).在同一剖面,古土壤层的CIA值高,说明在该层经历了暖湿的气候条件,化学风化作用较强;而风成砂层CIA值较低,指示在该层经历了相对冷干的气候条件和较弱的化学风化作用.Rb/Sr能够反映土壤湿度的变化,也是夏季风强度变化的主要标志[40-42].因此,Rb/Sr值一般被用来作为夏季风强度的替代性指标[40-42].(CaO+Na2O+MgO)/TiO2指标经常被用作化学风化水平的替代性指标[43].由于受到气候变化的影响,相对稳定元素和易迁移元素会产生不同地球化学行为,因此利用Rb/Sr值和(CaO+Na2O+MgO)/TiO2值可以进行古气候变化的重建.在古土壤层Rb/Sr比值较高,(CaO+Na2O+MgO)/TiO2较低,指示了相对暖湿的气候条件;反之,在风成砂层指示了相对冷干的气候条件. ...
Holocene precipitation and temperature variations in the East Asian Monsoonal Margin from pollen data from Hulun Lake in northeastern Inner Mongolia,China
... 图中灰色条带代表了两个剖面古土壤发育阶段Comparison of the probability density curve of paleosol in Hulun Buir Sandy Land with the quantitative reconstruction of annual mean precipitation,annual mean temperature and 65°N solar radiation in Hulun Lake[6,54]Fig.5
Holocene climatic changes revealed by aeolian deposits from the Qinghai Lake area (northeastern Qinghai-Tibetan Plateau) and possible forcing mechanisms
Geochemical characteristics of Holocene loess-paleosol sequences in central Chinese Loess Plateau and their implications for East Asian monsoon evolution