中文摘要：

对IODP333航次四国海盆北部地区C0011站位表层样品进行粒度和Sr-Nd同位素分析,并与前人发表的邻近海域同位素数据进行比较。经分离自生碳酸盐组分,四国海盆全新世沉积物呈现较好的陆源、火山源二端元组分特征。从地理位置看,四国海盆北部主要物质来源包括伊豆-小笠原海脊火山物质、日本列岛西南部的混合型沉积物以及由西向风或河流入海洋流输送而来的亚洲陆地沉积物,且日本列岛西南部对于该区域物质贡献最大。对四国海盆北部而言,与海盆中部沉积及日本海沉积相比,源自亚洲大陆的碎屑沉积物具有更多的贡献。沉积物中87Sr/86Sr与εNd、平均粒径的负相关关系反映了沉积物中陆源物质的相对贡献按时间顺序呈现增加、减小、增加、减少的多周期变化趋势。

英文摘要：

Grain size and Sr-Nd isotope analyses are carried out for the core C0011 samples,the northern Shikoku Basin,obtained from the IODP Expedition 333.The results are used for a comparative study with the isotope data obtained from adjacent areas.The Holocene sediment in the Shikoku Basin shows the characteristics of two-end member mixing processes,i.e.,the terrestrial constituent and the volcanic source.In terms of the geographical location,the material supply to the Shikoku Basin mainly consists of volcanic materials from the Izu-Bonin Arc,the mixing-type sediment from the northwest Japanese islands,and terrestrial sediment transported by the prevailing westerly winds,monsoon or rivers from the Asian mainland.In general,the materials from the northwest Japanese islands represent the largest contribution.In comparison with the sediment from the central Shikoku Basin and the Japan Sea,the sedimentary materials from the northern Basin display a relatively large contribution by terrestrial sources.Based upon the negative correlation between 87Sr/86 Sr andεNd,together with the 87Sr/86 Sr ratio and mean grain size,the relative contribution of terrestrial sources indicates a multi-periodic variation pattern as increase,decrease,increase,decrease,according to the chronological sequence.