东太平洋晚新生代生物生产力演化特征的初步研究

PRELIMINARY STUDY ON EVOLUTION OF LATE CENOZOIC PRIMARY BIOLOGICAL PRODUCTIVITY IN EAST PACIFIC OCEAN

利用沉积物中有机碳含量与初级生物生产力之间的关系,讨论了东太平洋晚新生代初级生物生产力演化规律。研究结果表明,研究区现代生物生产力水平为70～110g/m^2·a,而且在研究区内(7°～13°N,138°～150°W)东南侧生物生产力高于西北侧。早中新世该区的生物生产力为104.27～196.33g/m^2·a,中中新世为174.47g/m^2·a左右,上新世至第四纪为177.40～282.93g/m^2·a。

Based on the relationship between the organic contents in sediments and primary biological productivities, the evolution of the Late Cenozoic primary biological productivity of the surface and column sedments has been studied in the East Pacific (7°-13°N, 138°-150°W). The researches indicated that the modern primary biological productivity in the region was 70-110g/m2 · a and was higher in the southeasten part of the region than in northwesten part. The productivity in the Early Miccene was 104.27 - 196. 33g/m2· a, while in the Middle Miocene about 174. 47g/m2 · a and the Pliocene-Quaternary 177.4.0-282. 93g/m2 · a. It is found that equatorial upwellingand Antarctic bottom currents bore much upon the primary biological productivity in the region.