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前言 克利尔湖位于主要属晚更新世的克利尔湖火山场北侧,是在加利福尼亚旧金山以北约120公里、四周由断层环绕、地震活跃的山间谷地中(图1)。1973年曾以这个湖的沉积物中钻取过8个13.9—115.2米长的连续岩心,最长的是本文所研究的岩心4,它记录了这一大湖盆晚更新世和全新世的沉积作用。该岩心的C~(14)年龄和对火山灰层对比都存在一些问题,这迫使我们采用另外的方法作为岩心的年代标尺。这里报道的是我们对岩心4沉积物所做的氨基酸地球化学研究在地质年代学上应用的初步结果。
Preface Clear Lake is located on the northern side of the Kelp Lake Volcano, mainly of the late Pleistocene, about 120 km north of San Francisco, California, surrounded by faults and active earthquake valleys (Figure 1). In 1973, eight consecutive cores of 13.9-115.2 meters in length were drilled from the sediments of this lake, the longest of which was the core 4 studied in this paper, which recorded the sediments of the late Pleistocene and Holocene in this large lake basin effect. The C ~ (14) age of the core and its comparisons to volcanic ash layers all present some problems, forcing us to adopt another method as the core of the core. What is reported here is the preliminary geochronological application of the amino acid geochemistry of our Core 4 sediments.