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南海南部 1796 2柱状样 (7°11′N、112°5′E,柱长 8m,水深 196 8m)中近 30 ka来的沉积物堆积速率计算结果显示 ,该孔冰期平均堆积速率为全新世的 3倍多。其变化与冰期时海平面下降、地表径流所携陆源物质增多、全新世时海平面的回升以及陆源物质的提前卸载有关。浮游有孔虫氧同位素测定结果表明 ,该孔的浮游有孔虫的氧同位素冰期 /全新世差值高于南海的平均值 ,更大于开放性大洋赤道西太平洋低纬度区的平均值。Ca CO3变化则受陆源物质的“稀释作用”控制 ,而溶解作用对其影响并不太显著。
The accumulation rate of sediments in the southern South China Sea for 17 ka 2 (7 ° 11’N, 112 ° 5’E, 8 m in length and 196 8 m in depth) in the past 30 ka shows that the average accumulation rate of the pore during the Holocene More than 3 times. The change was related to the declination of sea level during the glacial period, the increase of terrigenous materials by surface runoff, the sea level rise during Holocene and the early unloading of terrigenous materials. The results of the planktonic foraminifera oxygen isotope measurements show that the lacustrine foraminiferal oxygen isotope glacial / Holocene difference is higher than the average value of the South China Sea, more than the open oceanic equatorial Western Pacific low latitude average. The change of CaCO3 is controlled by the “dilution effect” of terrigenous material, but the effect of dissolution is not significant.