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选取南沙海区南部重力柱状样 1 796 2 ( 7°1 1′N ,1 1 2°5′E ,柱长 8m ,水深 1 96 8m) ,在高分辨率地层学基础上 ,通过有机碳、碳酸盐、蛋白石、浮游及底栖有孔虫群等多种指标探讨古生产力的变化 ,并定量计算了该柱状样近 30ka来的表层古生产力 .结果发现南沙海区南部末次冰期的古生产力增大 ,约为全新世的 1 6倍 ,推测与冰期海平面下降 ,该柱状样所在位置的陆源营养元素增多有关 .
Based on the high-resolution stratigraphy, we selected 1 796 2 (7 ° 1 1’N, 1 1 2 ° 5’E, pillar length 8m, depth of 1 96 8m) Acid phosphatase, planktonic and benthic foraminifera and other indicators to investigate the changes of paleoproductivity and to quantify the paleo-productivity of the surface layer in the last 30 ka. The results showed that the paleoproductivity in the last glacial stage in southern Nansha sea area increased , About 16 times of the Holocene. It is speculated that the increase of terrigenous nutrient elements at the location of the columnar samples is related to the declining sea level during the glacial period.