| 摘要: |
| 总结了青藏高原地区400多个湖泊湖水的Mg2+、Ca2+和Mg/Ca等水化指标与湖水盐度的相关关系,以及这种关系随着湖水变化(不同采样时间和采样点以及自然蒸发)而产生的变化规律.结果表明:青藏高原湖泊湖水的Mg2+浓度与盐度具有较为稳定的正相关关系,而Ca2+和Mg/Ca与盐度的相关性较弱.在对于某一特定水化学类型的湖泊,一般碳酸盐型湖泊的Mg2+、Ca2+以及Mg/Ca等指标与盐度均没有明显的相关性;硫酸盐型湖泊中Mg2+浓度和盐度呈现较高的正相关关系,而Ca2+以及Mg/Ca与盐度的相关性仍很弱;而在氯化物型湖泊中,Mg2+浓度与盐度呈更高的正相关性,Ca2+浓度也与盐度呈一定的正相关性,Mg/Ca这一指标与盐度的相关性依然很弱.而对某一特定湖泊,在不同演化阶段或不同的采样地点,Mg2+浓度与盐度仍然保持明显的正相关关系,而Ca2+以及Mg/Ca与盐度的相关性仍然不稳定或很弱.在青藏高原作古环境重建应用的时候,湖水Mg2+浓度是古盐度一个较好的转换指标,而Ca2+以及Mg/Ca的古盐度指示意义相对较弱. |
| 关键词: 青藏高原 湖泊 Mg2+ Ca2+ Mg/Ca 盐度 相关性 |
| DOI：10.18307/2010.0612 |
| 分类号: |
| 基金项目:中央级公益性科研院所基本科研业务费专项资金项目(K2007-3-2,K0918);中国地质科学院重点实验室专项基金项目(K0915);国家自然科学基金重点项目(40531002);国家地质大调查项目(1212010818057)资助 |
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| Preliminary analysis on Mg2+, Ca2+ and Mg/Ca as salinity indicators of lakes in the Qing-hai-Tibetan Plateau |
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WANG Hailei1,2,3, WANG Yunsheng1,2,3
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1.Institute of Mineral Resources, Chinese Academy of Geological Sciences(CAGS), Beijing 100037, P. R. China;2.Key Laboratory of Saline Lake Resources and Environment, Ministry of Land and Resources, Beijing 100037, P. R. China;3.R & D Center for Saline Lake and Epithermal Deposits, CAGS, Beijing 100037, P. R. China
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| Abstract: |
| This paper summarizes the relationships between hydrochemical proxies of Mg2+, Ca2+, Mg/Ca and the salinity from more than four hundred lakes in the Qinghai-Tibetan Plateau. We discuss its variation characteristics by different samples from varied place and time, as well as natural evaporation. Mg2+ shows a stable positive relationship with salinity in Lakes in the Qinghai-Tibetan Plateau, while Ca2+, Ca show poor and unstable relationships with salinity. For carbonate water types in the lakes, however, no significant relationship is observed between Mg2+, Ca2+ and Mg/Ca and salinity in carbonate typed lakes. Mg2+ shows positive relationship with salinity in sulphate typed lakes, and Ca2+, Mg/Ca remains poor relationship with salinity. While in chloride typed lakes, Mg2+, shows distinct positive relationship with salinity, and Ca2+ also shows positive relationship to some extent with salinity. Ca still shows no clear relationship with salinity. In individual lakes, Ca2+ and Mg/Ca still show unstable and/or poor relationship with salinity, while Mg2+ keeps remarkable positive relationship with salinity. It is concluded that Mg2+ is a useful indicator for paleosalinity reconstruction in the Qinghai-Tibetan Plateau. |
| Key words: Qinghai-Tibetan Plateau lakes Mg2+ Ca2+ Mg/Ca aalinity relationship |
