付雷,
张森琦,
贾小丰,
李胜涛,
杨涛
中国地质调查局水文地质环境地质调查中心, 河北 保定 071051

基金项目: 中国地质调查局地质调查大项目（批准号：DD20160192）资助


详细信息

作者简介: 付雷, 男, 33岁, 工程师/硕士, 地质调查研究, E-mail:pengyou0808@163.com

中图分类号: P532;P595

收稿日期:2018-08-20
修回日期:2018-12-30
刊出日期:2019-03-30

Test of the paleoenvironment reconstruction of Bingling Hill travertine in large time scale

Fu Lei,
Zhang Senqi,
Jia Xiaofeng,
Li Shengtao,
Yang Tao
Center for Hydrogeology and Environmental Geology Survey, China Geological Survey, Baoding 071051, Hebei



MSC: P532;P595

--> Received Date: 20 August 2018
Revised Date: 30 December 2018
Publish Date: 30 March 2019


摘要
摘要:采用钙华中微量元素进行古气候环境重建为近年来国内外研究热点。前人研究成果主要为小时间尺度古气候环境重建，因微量元素的影响机制及地区间差异性问题，可能存在未知因素影响稀土元素含量及Mg/Ca、Mg/Sr比值，从而导致解译的古气候环境意义失真。以位于青海省格尔木地区的达布逊湖达1井孢粉谱图与青藏高原湖区变化谱图为参照对象，对青海省平安县三合镇东北冰凌山万年尺度下钙华的古环境重建方法进行了检验，结果表明：1）冰凌山泉华台地沉积环境相对稳定，提供冰凌山钙华物质来源的地下水长期处于接受来自地壳深部CO₂补给的偏酸性条件下；2）所采集钙华样品除P04点外，均具有相同的物质来源和形成过程；3）万年尺度下，用钙华中的稀有元素总量重建古气温方法可行，且稀有元素总量与古气温呈负相关关系；4）采用Mg/Ca、Mg/Sr比值重建古降水环境应区分钙华成因类型，表生钙华Mg/Ca、Mg/Sr比值与古降水呈现负相关，而内生钙华Mg/Ca、Mg/Sr比值与古降水呈现正相关
关键词: 钙华/
稀土元素分析/
Mg/Ca与Mg/Sr比值/
古气候环境

Abstract:In order to reconstruct the paleoclimate environment of Bingling Hill (36°26'42.7"N, 101°59'10.3"E; 2393 m a.s.l.)in Qinghai Province, seven calcite samples were taken, and the contents of REE and the ratios of Mg/Ca and Mg/Sr were analyzed. The travertine samples U-Th dating results varied from 16.82 ka to 53.77 ka, the REE content varied from 1.755 μg/g to 54.788 μg/g, and LREE/HREE>1, belonging to the light rare earth enrichment distribution model. In this work, we took the pollen spectra of 1 well Dabuxun Lake as the reference object, and then carried out test on ancient environment reconstruction methodology of Qinghai Bingling Hill travertine in large time scale, and the results show that: (1)The sedimentary environment is relatively stable, and the groundwater that provides the material source of the ice ridge mountain travertine is under the long-term acidic condition that taking CO₂ supply from the deep crust; (2)The collected travertine samples have the same material source and formation process except P04 point; (3)Considering long time scale, it is feasible to reconstruct the paleo temperature with the total amount of rare elements in travertine, and the total amount of rare elements is negatively correlated with the paleo temperature; (4)Reconstructing the ancient precipitation environment using Mg/Ca and Mg/Sr ratios should distinguish the travertine genetic type. The ratio of epigenetic travertine Mg/Ca and Mg/Sr is negatively correlated with ancient precipitation, while endogenous travertine Mg/Ca and Mg/Sr is positively correlated with pale precipitation.
Key words:travertine/
REE analysis/
ratio of Mg/Ca and Mg/Sr/
the ancient climate



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