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湖泊科学  2008 

青藏高原湖泊表层沉积物中陆源正构烷烃氢同位素比值的气候意义

DOI: 10.18307/2008.0606

Keywords: 正构烷烃,湖泊沉积,氢同位素比值,降水,气候,青藏高原

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Abstract:

选取青藏高原南北断面气候环境条件差异明显的大枪勇错、空姆错、纳木错、克鲁克湖和小柴达木湖的表层沉积物进行了陆源正构烷烃(C25-C31)的提取分析.通过将这些生物标志物δD值与源区生长季节大气降水δD值进行比较,发现两者有很好的相关性,说明陆源沉积正构烷烃记录了生长季节降水同位素信号.正构烷烃n-C25、n-C27与大气降水间氢同位素分馏在-45‰至-70‰之间,而n-C29、n-C31与大气降水间氢同位素分馏在-70‰至-95‰之间,沿青藏高原南北断面分馏恒定,分馏平均值分别是-57‰和-82‰.通过对比欧洲断面的-130‰分馏值,可以看出青藏高原南北断面陆源沉积正构烷烃与大气降水间表观同位素分馏小很多.

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