日本の新生代層に含まれているアミノ酸
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概要
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The object of this study is to present that in what way concentration and constituent of amino acids in sediments are influenced by sedimentary environment and duration of diagenesis. 50 samples were collected from the Cenozoic sediments distributed in the Osaka area, Boso Peninsula, the Niigata area and the Jyoban area. The analytical results on these samples are summarized as follows. 1. The concentrations of amino acids in 50 samples of the Cenozoic sediments show a decreasing trend with increasing duration of burial. The values ranged 900-1800μg/g in the Holocene sediments, 20-520μg/g in the Pleistocene sediments, 3-35μg/g in the Pliocene sediments and 4-15μg/g in the Miocene sediments. From two samples of the Oligocene sediments, no amino acids were detected (Table 1, Fig. 5). Furthermore, analytical results of the core samples from the borings at Osaka show that the amino acid concentrations at the Holocene and the Pleistocene sediments decrease exponentially with increasing depth of burial (520-20μg/g), but below the depth at the Pliocene-Pleistocene boundary the sediments have a uniform concentration level of amino acids (10-20μg/g). 2. Clayey sediments have high concentration level of amino acids compared with silty and sandy sediments. This fact may be caused by low microbial activity in reducing environment. 3. 19 kinds of amino acids are identified from 40 samples of the Cenozoic sediments (Table 2). 17 kinds of amino acids among them are a-amino acids, and the other two are γ-amino butyric acid and β-alanine. 16 kinds of amino acids-leucine, valine, γ-amino butyric acid, glycine, alanine, threonine, serine. proline, tyrosine, β-alanine, glutamic acid, aspartic acid, arginine, histidine, lysine, and ornithine-are detected from the almost all of the samples examined. Proline and hydroxyproline are detected from about half of the samples. Cystine is detected from a few of the samples. 4. Throughout all of the samples, there are no significant changes on the amino acids spectra (Table 2). This fact shows that the above mentioned 19 kinds of amino acids decrease at the definite rate independent of each own decomposition rate in a free state. This phenomenon suggests that amino acids in sediments are incorporated in nonproteinaceus polymers so called humin or kerogen. 5. γ-amino butyric acid and β-alanine are not diagenetic products from α-amino acids, but may be biogenetic matter produced by micro-organisms in the early stage of cliagenesis. 6. It is suggested that amino sugars may also be widely disseminated in the Cenozoic sediments of Japan.
- 地学団体研究会の論文
- 1972-03-25