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PALEOENVIRONMENT OF JAPAN IN THE RECENT 500,000 YEARS,BASED ON AMINO ACID ANALYSIS

基于氨基酸分析的日本近50万年的古环境

基本信息

批准号：
06453197
负责人：
MIYAUCHI Takahiro
金额：
$ 4.8万
依托单位：
CHIBA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

This project was performed based of amino acid analysis and ESR (electron spin resonance) dating of molluscan samples derived from the middle -late Pleistocene marine sediments in Japan ; Jaban Coast and the Miura Peninsula on Pacific Ocean side, and the Oga Peninsula and the Noto Peninsula on Japan Sea side. The oyster sample from Joban Coast was not suitable for analysis with bad preservation. The results are as follows.1.Amino acid analysis system was set up with automatic routine requiring about thirty minutes from counting to data processing for a sample. This system made repeated runs with less error possible.2.ESR dates fromthe Miura Peninsula and the Oga Peninsula support previous age estimated by fission track dating or thephrochronology. Only the date from the Noto Peninsula suggest the penultimate interglacial stage 200ka ago. This indicates that vertical crustal movements should be re-examined in rate.3.Relative age estimated from amino acid analysis supported that ESR dates are almost sure. D/L ratio of isoleucine shows that racemization rate in more northern mollusca is slower than in southern ones in diagenesis and the rate is uniform in unit to interglacial. Based on these data, the climatological temperature difference is estimated to be as uniform as the recent between the Oga -the Noto Peninsula -the Miura Peninsula.

该项目基于对日本中晚更新世海洋沉积物中的软体动物样本进行氨基酸分析和ESR（电子自旋共振）测年；太平洋一侧的贾班海岸和三浦半岛，以及日本海一侧的男鹿半岛和能登半岛。常磐海岸的牡蛎样本保存不良，不适合分析。结果如下： 1.氨基酸分析系统采用自动化程序，样品从计数到数据处理大约需要30分钟。该系统使重复运行成为可能，误差较小。2.三浦半岛和男鹿半岛的ESR日期支持通过裂变径迹测年或年代学估计的先前年龄。只有能登半岛的日期表明了200年前的倒数第二个间冰期。这表明地壳垂直运动的速率应重新审视。3.氨基酸分析估计的相对年龄支持ESR日期基本确定。异亮氨酸的D/L比值表明，在成岩过程中，北部软体动物的外消旋化速度慢于南部软体动物，且单位间至间冰期的外消旋化速度一致。根据这些数据，估计男鹿-能登半岛-三浦半岛之间的气候温差与最近一样均匀。