陆地热泉钙华：重建古气候历史信息重要载体

【研究目的】陆地热泉钙华作为火山、地热区常见的陆相碳酸盐岩沉积物/岩被广泛用于恢复古环境，但其中可反映古气候信息的代用指标多受复杂外界条件变化控制，因此利用热泉钙华进行古气候信息提取有待深入研究。【研究方法】本文对当前热泉钙华在重建古气候信息方面的成功案例进行了总结，并梳理了与热泉钙华沉积相关的各类气候、非气候影响因素。【研究结果】研究认为针对热泉钙华进行古气候恢复代用指标的选取，目前较为可行的有C-O同位素、主微量元素，孢粉学数据由于孢粉保存的局限性，可作为佐证信息，配合其他气候代用指标来检验古气候意义的正确与否，同时需将热泉钙华中各项气候代用指标与生物地层学、冰芯、石笋等相对成熟的古气候研究手段进行对比，使各类古气候替代指标相互验证，从而更好的解读热泉钙华中古气候信息。【结论】利用热泉钙华中的各项气候代用指标进行可靠的古气候信息提取与恢复具有可行性。创新点：本文梳理了国内外热泉钙华恢复古气候的成功案例，并探讨了针对热泉钙华进行古气候恢复研究存在的问题。

Terrestrial hot-spring travertine:An important window into paleoclimate reconstruction

This paper is the result of hydrogeological and environmental geological survey engineering.Objective] Terrestrial hydrothermal spring travertine, as a common terrestrial carbonate sediment/rock in volcanic and geothermal areas, is widely used to restore paleoenvironment, but the proxy indicators that can reflect paleoclimate information are mostly controlled by complex external conditions. The extraction of paleoclimate information from hot spring travertine requires further research.Methods] This paper summarizes the current successful cases of hydrothermal travertine in reconstructing paleoclimate information, and sorts out various climatic and non- climatic influencing factors related to the deposition of hydrothermal travertine.Results] The authors believe that C- O isotopes, major and trace elements are more feasible for the selection of palaeoclimate restoration proxies for hydrothermal travertine. The palynological data can be used as corroborative information due to the limitation of sporopollen preservation, and can be used in conjunction with other climate proxies. indicators to test whether the palaeoclimate significance is correct or not. At the same time, it is necessary to compare various climatic proxies in thermal spring travertine with relatively mature paleoclimate research methods such as biostratigraphy, ice cores, stalagmites, etc., so that various paleoclimate proxies can be verified with each other, so as to better obtain the information on the medieval climate of the hot spring travertine.Conclusion] It is feasible to extract and restore reliable paleoclimate information by using various climatic proxies in hot spring travertine.Highlights: This paper reviews the successful cases of hydrothermal travertine restoration of paleoclimate at home and abroad, and deeply discusses the problems existing in the study of paleoclimate restoration for hydrothermal travertine.