洞穴次生化学碳酸盐沉积物-石笋的气候替代指标的意义与不确定性因素  

Significance and Uncertainty of Speleothem-Stalagmite Proxies

作　　者：张美良[1] 朱晓燕[1] 吴夏[1] 潘谋成[1] 阳和平[1] 

机构地区：[1]中国地质科学院岩溶地质研究所岩溶动力学重点实验室,广西桂林541004

出　　处：《地球与环境》2015年第2期138-151,共14页Earth and Environment

基　　金：国家自然科学基金(批准号41372190);中国地调局"中国气候变化洞穴沉积记录研究"(编号:12120113005700)

摘　　要：洞穴次生化学碳酸盐(CaCO3)沉积物-石笋、钙华和流石,是一个具有丰富的陆地古气候信息的档案库。洞穴碳酸盐(CaCO3)-石笋古环境重建常用的代用指标有碳、氧稳定同位素、生长速度、纹层厚度和灰度、有机质荧光、微量元素等,利用多种替代指标的环境解译,增加了古气候环境重建的可靠性。本文从测年方法和石笋年代学的研究入手,对石笋的生长速度,沉积速率、纹层厚度、稳定同位素、微量元素等各代用指标指代的气候意义进行了简述,同时,也对洞穴次生化学碳酸盐(CaCO3)沉积物-石笋中各单一代用指标存在的不确定性影响因素进行了探讨。因此,我们认为洞穴动态监测可为洞穴碳酸盐(CaCO3)沉积物的各替代指标的解译提供可靠的依据,充分利用现代洞穴监测的碳酸盐(CaCO3)沉积物的各替代指标,并与现代器测气象资料进行相互对比、并用以校正,是精确或定量解释石笋气候替代指标的关键。Speleothems,such as stalagmites,stalactites and flowstones,are a rich archive of terrestrial paleoclimate information.The potential of these materials has come to realization only during the last decade and created a surge in speleothem-based research.Commonly speleothem（or stalagmites）-based paleoclimate proxies are stable isotope ratios of speleothem calcite（δ18 O andδ13 C）,growth rate or intervals,annual band thickness and gray,organic fluorescence and trace elements,and multiple proxies of environmental interpretation increase the reliability of the paleoenvironment reconstruction.Beginning with the stalagmite chronology,the authors simply introduce the climate significance of various proxies of growth or deposition rate,annual band thickness and gray,stable isotopes and trace elements,respectively,and the uncertain factors in the practical application were also discussed.We recommend making full use of alternative indicators of modern carbonate（CaCO3）sediments in field cave monitoring,and comparison with local measuring meteorological data,which is the key for accurate and quantitative interpretation.

关 键 词：洞穴石笋 代用指标 环境意义 不确定性 

分 类 号：P588.24[天文地球—岩石学]