南大洋普里兹湾沉积物中锗的含量与分布

本文利用中国第21-27次南极考察期间获得的沉积物样品，对南大洋普里兹湾沉积物中锗（Ge）的含量以及分布特征进行了初步研究。结果表明：普里兹湾表层沉积物中总Ge（Getotal）的含量在1.14×10-6~2.35×10-6之间变化，平均含量为1.71×10-6，最高值出现在湾外深海区P3-9站，最低值出现在湾内冰架边缘附近的P4-13站。在研究海域表层沉积物中生源Ge（Gebio）占Getotal的百分含量在16-68%之间变化。在表层沉积物中Gebio与Getotal分布变化趋势总体上相近，以67°S为界均呈现湾外高于湾内的趋势，在柱状沉积物中Ge的垂向分布呈现表层高于底层趋势。在普里兹湾湾内非冰间湖区域的表层沉积物中Gebio与生物硅（BSiO2）呈现一定的正相关，在P3-16站位柱状沉积物中Gebio与BSiO2垂向分布相似。

SPATIAL DISTRIBUTION OF GE IN THE SEDIMENTS OF PRYDZ BAY, SOUTHERN OCEAN

The spatial distribution and concentration of Germanium (Ge) was investigated in sediments from the Southern Ocean (Prydz Bay). The content of Ge_total in surface sediments ranged from 1.14×10^-6-2.35×10^-6, with a mean of 1.71×10^-6. The highest Ge_total content was found in P3-9 station, which was in the deeper open sea area out of the Prydz Bay. The lowest Ge_total was recorded at the P4-13 station, which was near the edge of the Amery ice shelf. In the surface sediments, Ge_bio accounted for 16%-68% of Ge_total.Spatially,Ge_bio and Ge_total had similar distribution patterns, with higher values recorded outside, and lower contents in the south area of 67°S. The vertical distribution of Ge decreased with depthin the core sediments. In the surface sediments outside of the Polynyas, there was a positive correlation between Ge_bio and biogenic silica（BSiO₂）. Specifically, the depth profiles of Ge_bio and BSiO₂ were similar in the sediments from the P3-16 station.