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

	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
其他题名	Characteristics of Geochemical Weathering of Loess in the Tongchuan Area during 11.4~1.5 ka B.P. and Its Paleoclimatic Implications
	周家兴 1; 吴利杰 2; 于娟 3; 杨丽君 4
	2019
发表期刊	地球与环境
ISSN	1672-9250
卷号	47 期号:1 页码:64-73
摘要	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.
其他摘要	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。
关键词	铜川剖面元素地球化学风化强度古气候 Tongchuan element geochemistry weathering intensity Paleoclimatic
收录类别	CSCD
语种	中文
WOS关键词	Geology
WOS研究方向	Science & Technology
WOS类目	GEOLOGY
CSCD记录号	CSCD:6428783
引用统计	被引频次：5[CSCD] [CSCD记录]
文献类型	期刊论文
专题	任务一_子任务一循证社会科学证据集成任务一
作者单位	1.西北大学地质学系;;中国地质科学院水文地质环境地质研究所, 大陆动力学国家重点实验室;;, 西安;;石家庄, ;; 710069;;050061 2.西北大学地质学系;;中国地质科学院水文地质环境地质研究所, 大陆动力学国家重点实验室;;, 西安;;石家庄, ;; 710069;;050061 3.中国地质科学院水文地质环境地质研究所;;中国地质大学(武汉)环境学院, ;;, 石家庄;;武汉, ;; 050061;;430074 4.西北大学地质学系, 大陆动力学国家重点实验室, 西安, 陕西 710069, 中国
推荐引用方式 GB/T 7714	周家兴,吴利杰,于娟,等. 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[J]. 地球与环境,2019,47(1):64-73.
APA	周家兴,吴利杰,于娟,&杨丽君.(2019).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.地球与环境,47(1),64-73.
MLA	周家兴,et al."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".地球与环境 47.1(2019):64-73.