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《Chinese Journal of Geology》 1983-02
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Li Renwei,Tian Xingyou and Lin Daxing(Institute of Geology,Academia Sinica,Beijing)  
The Amino acids in mudstone samples taken from different environments in some sedimentary basins of Eastern part of China were analysed by gas chromatographic method and the relationship between the amino acid geochemistry and the sedimentary environments was discussed.The amino acids are alanine,valine,glicine,isoleueine,alloisoleucine,β-alanine,leucine,threonine,proline,serine,γ-ABA,methionine,hydro-xyproline,phenylalaiiiue,aspartic acid,ornithine and lycine.It is shown that there is no kind of protein amino acid composition to specify a given environment.However,the composition and distribution of the amino acids of mudstones in delta or river environments is of great variation and the content of amino acids is low.In contrast,for mudstones of a lagoon environment of Bohai basin the composition and distribution of protein amino acids is quite stable and the content of amino acids is high.For non-protein amino acids β-alanine and γ-ABA can be found nearly in all analyzed samples.It is interesting that more than ten un-known compounds were discovered in the mud-ston-es located in the above-mentioned lagoon.They are probably non-protein amino acids or amino sugars.
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