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青藏高原现代湖泊沉积物碳酸盐矿物氧同位素组成特征及影响因素

, PP. 591-600

Keywords: 青藏高原,现代湖泊,总碳酸盐,方解石,白云石,氧同位素,影响因素

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Abstract:

选择青藏高原14个代表性现代湖泊的表层沉积物为研究对象,它们是冷湖、大苏干湖、小苏干湖、大柴旦湖、小柴旦湖、托素湖、尕海、茶卡湖、唐古拉-1、错鄂、乃日平错、纳木错、空姆错和普莫雍错,探讨这些湖泊碳酸盐矿物组成及相应氧稳定同位素组成的影响因素。XRD结果显示这些湖泊的碳酸盐矿物多以方解石为主,并含白云石。其中冷湖以白云石为主,尕海还含有一定量的文石。碳酸盐氧同位素分析结果显示总碳酸盐δ18O在-15.9‰到2.6‰范围变化,方解石δ18O变化范围为-16.2‰~3.9‰,白云石δ18O变化在-15.3‰~-5.4‰范围内。通过氧同位素与湖区环境因素的相关性分析,认为总碳酸盐δ18O受湖水δ18O组成、温度、降水量/蒸发量、盐度、海拔和纬度多种因素影响;方解石δ18O主要受湖水δ18O、温度、盐度、海拔和纬度的影响;白云石δ18O受降水量/蒸发量和盐度的影响。总碳酸盐δ18O对湖水δ18O、温度、海拔和纬度的响应是以方解石为载体而体现的;总碳酸盐δ18O对降水量/蒸发量的响应则归因于白云石δ18O对其的响应结果;另外总碳酸盐δ18O通过方解石和白云石δ18O的叠加作用响应于盐度。该研究初步建立了总碳酸盐、方解石和白云石氧同位素与环境各个指标之间的响应关系,对于揭示过去青藏高原地区环境变化有重要意义。

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