globalchange  > 气候变化事实与影响
CSCD记录号: CSCD:6213858
论文题名:
钙华在第四纪研究中的应用:以青藏高原为例
其他题名: Possibilities and problems associated with travertines and tufas in Quaternary studies: A case of the Tibetan Plateau
作者: 汪智军; 殷建军; 袁道先
刊名: 科学通报
ISSN: 0023-074X
出版年: 2018
卷: 63, 期:11, 页码:601-612
语种: 中文
中文关键词: 钙华 ; 古气候环境 ; 地貌演化 ; 构造活动 ; 地质考古 ; 青藏高原
英文关键词: travertines and tufas ; paleoclimate and paleoenvironment ; landscape evolution ; tectonic activities ; geoarcheology ; the Tibetan Plateau
WOS学科分类: GEOLOGY
WOS研究方向: Geology
中文摘要: 钙华广泛分布于陆地环境中,且能够提供绝对的沉积年代(如铀系测年)和记录沉积时的地质与环境信息,被广泛应用于第四纪研究中.目前我国大多数古钙华还缺乏系统的研究,尤其是对不同成因类型钙华的地质与环境意义的认识还不够深入且存在争议.故本文以青藏高原上的钙华为例,综述了钙华在第四纪研究中的应用,探讨了钙华研究中需要注意的问题,并展望了未来的研究重点.实例分析显示钙华在重建第四纪古气候环境变化中有很大潜力.其中,青藏高原上热成因钙华的形成和演化,除了受高原强烈的构造活动控制外,还与印度夏季风变化具有密切联系,故有可能为青藏高原提供更多和覆盖更长时间尺度的古气候环境记录.此外,钙华在区域地表过程和地貌演化、构造和地热活动历史以及地质考古等领域也具有很大的研究价值.基于钙华沉积的特点,如分布不连续、沉积形态和岩相结构多样、沉积机理复杂等,提出了需要综合利用沉积学、岩相学、地球化学和年代学等多种手段对钙华进行系统的研究.
英文摘要: Travertines and tufas, precipitated from waters (hydrothermal and ambient temperature karstic waters respectively) enriched in calcium and bicarbonate ions, are widespread in continental settings. Both carbonate deposits are important archives for Quaternary studies, as they can be absolutely dated (e.g. via uranium-series dating) and provide evidence of climatic and environmental conditions at the time of formation. Yet, most of the travertines and tufas in China still lack investigation and little is known about the nature of geological and paleoenvironmental information stored in these deposits. Here we summarize previous studies of travertines and tufas from the Tibetan Plateau, with an emphasis on possibilities and problems associated with these carbonates in Quaternary studies, and lastly provide our perspectives on the future of travertine and tufa research. Travertines are quite common on the Tibetan Plateau and preferentially occur along active tectonic zones, such as the approximately north-south trending rift systems and some strike-slip faults caused by the uplift of the Plateau and subsequent east-west extensional deformation of the Tibetan crust during the Late Cenozoic. At present these travertines are under-researched, but several previous studies have shown that the travertine deposition on the Plateau is not only controlled by tectonics but also closely associated with the intensity of the Indian summer monsoon. Some lacustrine tufas deposited on the paleoshorelines of several closed-basin lakes on the Plateau are able to reconstruct lake-level (and hence paleomonsoon) change. It is therefore expected that the widely-distributed travertines and tufas on the Tibetan Plateau have great potential to provide insight into past monsoonal climate change. Furthermore, travertines and tufas preserved in different terrestrial settings, such as periglacial slope, fluvial, and lacustrine environments on the Plateau, appear to be a promising tool for unravelling climate-driven surface processes and geomorphological change of an area. The formation of travertines (e.g. travertine fissure-ridge) is often linked with active tectonics and can thus provide more evidence of faulting and geothermal activities on the Plateau. In several instances, archeological finds (e.g. ancient human hand- and footprints) are stratigraphically or spatially associated with travertines or tufas; thus the dating of these carbonates may provide the timing of human migration and settlement of the Tibetan Plateau, and allow us to better understand the prevailing climatic and environmental conditions during site occupation and abandonment. Several problems might be encountered in the study of the travertines and tufas. Firstly, the travertines and tufas tend to accumulate discontinuously due to the tempo-spatial shift in spring orifice location and water flow pattern, and may be mixed with terrigenous sediments.
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/154357
Appears in Collections:气候变化事实与影响

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作者单位: 中国地质科学院岩溶地质研究所, 国土资源部/广西壮族自治区岩溶动力学重点实验室, 桂林, 广西 541004, 中国

Recommended Citation:
汪智军,殷建军,袁道先. 钙华在第四纪研究中的应用:以青藏高原为例[J]. 科学通报,2018-01-01,63(11):601-612
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