南沙海域柱状沉积物中氨基酸组成和含量特征与古环境

Compositions and Contents of Amino Acids in Core Sediments from Chinese Nansha Sea Area and Paleoenvironment

对南沙海域柱状沉积物中氨基酸进行了系统分析，研究了氨基酸含量的剖面变化及不同类型氨基酸组成差异的起因，据此探讨了自中更新世晚期以来南抄海洋古沉积环境和古气候问题。结果表明，沉积环境为碱性，沉积区气候发生了四次冷一暖旋回。从而揭示了沉积氨基酸丰度和组成特征可以示踪沉积时期的古环境。

The abundance and distribution of amino acids in sediments are closely related to the organism amounts and sedimentary environment. However organism amounts are controlled by the climatic condition during sedimentary period. Thus, the abundance and distribution of amino acids in sediments can indicate the situatbo of paleoclimate. In this paper, amino acids 4. a sedimentary core section (0-440 cm) of Nansha Sea area have been examined. Results show that 17 kinds of amino acids are present in this cQre section ; amino acid contents are from 925 to 2343 ug/g; acidic amino acid to neutral amino acid ratios are from 0. 48 to 0.71. The section variation of amino acid contents and composition of amino acids show alkalic sedimentary environment and the four cold-warm evolutions of paleocllmate during this sedimentary period, respectively.These imply that abundance and composition of amino acids can be used as an good indicator of sedimentary paleoenvironment.