贵州草海沉积物纤维素氧同位素研究及其古环境意义
Oxygen Isotopic Composition of Cellulose in Sediments from Lake Caohai, and Its Paleoenvironmental Implications
查看参考文献48篇
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文摘
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纤维素在湖泊沉积过程中不易发生分解,故其稳定同位素组成能真实地反映原始环境信息。本文在建立一套有效的四阶段(酸洗、碱洗、漂白及碱洗)湖泊沉积物纤维素提取基础上,成功测定了近500年草海沉积物纤维素氧同位素组成。草海纤维素氧同位素组成与董哥洞石笋恢复的降雨量的一致性变化表明纤维素氧同位素主要反映湖水氧同位素组成,进而指示了湖区降雨量变化。 |
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其他语种文摘
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Cellulose is difficult to degrade in the lake deposits, and its isotopic composition can truly reflect the original environmental information. On the basis of the cellulose extraction method including acid washing, alkaline washing, bleaching and also alkaline washing, we have successfully measured the oxygen isotopic composition of cellulose in organic matter from Lake Caohai sediments in the past 500 years. The good agreement betweenδ 18O values of cellulose at Lake Caohai and precipitation variations reconstructed from Dongge Cave suggests that the δ 18O values of cellulose can be used to deduce the δ 18O values of lake water, thus reflecting the precipitation variations. |
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来源
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地球与环境
,2010,38(1):8-13 【核心库】
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关键词
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草海
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纤维素
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氧同位素
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湖水氧同位素
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降雨量
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地址
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1.
中国科学院地球化学研究所, 中国科学院环境地球化学国家重点实验室;;重庆市国土资源和房屋管理局矿产地质与环境地质重点实验室, 贵阳, 550002
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重庆地质矿产研究院, 重庆, 400042
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贵州省环境科学研究设计院, 贵阳, 550002
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中国科学院地球化学研究所, 中国科学院环境地球化学国家重点实验室, 贵阳, 550002
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语种
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中文 |
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ISSN
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1672-9250 |
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学科
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地质学 |
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基金
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国家973计划
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国家自然科学基金面上项目
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文献收藏号
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CSCD:3902500
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