西太平洋马尔库斯-威克海山区沉积物中生物硅含量分布

Biogenic silica content and distribution in deep sea sediments at Marcus-Wake Seamounts area in the western Pacific Ocean

分析了大洋40航次在西太平洋马尔库斯-威克海山区山间海盆采集的表层沉积物中生物硅和有机质的含量,并对其分布特征和来源进行了初步的研究。结果表明,马尔库斯-威克海山区附近海域深海表层沉积物中生物硅含量总体较低,含量在0.88%~12.41%之间,平均含量为2.19%,分布上呈现西南含量高,向东北方向递减的趋势;深海表层沉积物中有机碳含量较低,δ^13C同位素组成分布与生物硅相同。沉积物柱状样的研究表明研究区在过去的100~200 ka期间表层水体中硅质生物的初级生产力是逐渐增加的。

In this study,the content of bio-silicon and organic matter in the surface sediments were analyzed,which were collected by the Ocean 40 voyage in the mountain basin of the Marcus-Wick Sea area in the western Pacific,and the preliminary research on its distribution characteristics and sources were also conducted.The results show that the content of bio-silicon in the deep sea surface sediments near the Marcus-Wicker Sea area is generally low,ranging from 0.88%to 12.41%,with an average content of 2.19%.The distribution shows a high content in the southwest and a diminishing trend toward the northeast.The content of organic carbon in the surface sediments is low,and the distribution ofδ^13C is the same as that of bio-silicon.Sediment core studies show that the primary production of siliceous organisms in the surface waters of the study area during the past 100-200 ka is gradually increasing.