铜川地区11.4~1.5 ka B.P.期间黄土地球化学风化特征及其古气候意义
Characteristics of Geochemical Weathering of Loess in the Tongchuan Area during 11.4~1.5 ka B.P. and Its Paleoclimatic Implications
查看参考文献34篇
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文摘
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通过对铜川剖面黄土-古土壤地层中常量元素和微量元素的地球化学特征进行分析,结合AMS-~(14)C年代学数据,利用Na/K值、CIA(化学风化指数)、A-CN-K三角图、Bc(退碱系数)、Ki(残积系数)、Rb/Sr值和Ba/Sr值等指标,探讨了该地区11.4~1.5 ka B.P.间黄土-古土壤地层的化学风化特征及其古气候意义。结果表明:(1)Na/K、CIA和A-CN-K三角图等分析指示铜川剖面11.4~1.5 ka B.P.间黄土-古土壤地层处于初等化学风化作用阶段。(2)Bc、Ki、CIA、Rb/Sr和Ba/Sr等指标的变化趋势同黄土-古土壤地层具有很好的对应性,较好的记录了铜川地区11.4~1.5 ka B.P.间的气候变化特征,可以将该地区的气候变化划分为4个阶段:11.4~10.2 ka B.P.气候寒冷干燥;10.2~9.1 ka B.P.温度逐渐上升,气候略温偏干;9.1~4.4 ka B.P.气候温暖湿润;4.4~1.5 ka B.P.气候逐渐转为冷干。(3)元素地球化学参数记录的铜川地区全新世最适宜期为9.1~6.0 ka B.P.,并且在6.0~5.0 ka B.P.期间存在次一级的气候恶化事件。 |
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其他语种文摘
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The major and trace elements contents in loess-paleosoil strata were analyzed to characterized geochemical weathering along a profile of Tongchuan during 11.4-1.5 ka B.P. and its paleoclimatic implications were discussed in terms of chronologic dating, Na_2O/K_2O ratio, chemical index of alteration (CIA), A-CN-K diagram, return coefficient (Bc), eluvial coefficients (Ki), Rb/Sr ratio and Ba/Sr ratio. The results showed that: (1) the chemical weathering in loess-paleosoil strata of Tongchuan profile during 11.4-1.5 ka B.P. was relatively weak; (2) variation trends of Bc, Ki, CIA, Rb/Sr and Ba/Sr ratios corresponded well with the loess-paleosoil strata, which recorded climate changes well during 11.4-1.5 ka B.P. in the Tongchuan region, the major climate changes could be divided into four stages: the climate was very dry and cold during11.4-10.2 ka B.P., the climate was slightly warm and dry with temperature rising gradually during 10.2~9.1 ka B.P., the climate was warm and humid during 9.1~4.4 ka B.P., the climate turned to cold and dry gradually during 4.4-1.5 ka B.P.; (3) the Holocene optimum in Tongchuan was in 9.1-6.0 ka B.P. and a climatic event of cold fluctuation during 6.0-5.0 ka B.P. was recorded according to records of elemental geochemical parameters. |
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来源
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地球与环境
,2019,47(1):64-73 【核心库】
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DOI
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10.14050/j.cnki.1672-9250.2019.47.002
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关键词
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铜川剖面
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元素地球化学
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风化强度
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古气候
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地址
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1.
西北大学地质学系, 大陆动力学国家重点实验室, 西安, 710069
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中国地质科学院水文地质环境地质研究所, 石家庄, 050061
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中国地质大学(武汉)环境学院, 武汉, 430074
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1672-9250 |
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学科
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地质学 |
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基金
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中国地质调查局中国地质科学院基本科研业务费
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中央级公益性科研院所基本科研业务专项基金
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文献收藏号
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CSCD:6428783
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