南海深水区末次冰期和冰后期沉积物堆积速率的特征  

Accumulation rate characterstics of deep-water sedimentation in the South China Sea during the last galciation and the Holocene

作　　者：黄维[1] 汪品先[1] 

机构地区：[1]同济大学海洋地质国家重点实验室,上海200092

出　　处：《海洋学报》2007年第5期69-73,共5页

基　　金：国家重点基础研究发展规划资助项目(G2000078500);创新研究群体科学基金资助项目(40321603);国家自然科学基金重点资助项目(40331002);国家自然科学基金资助项目(4027601940506014);教育部科技基础条件平台资助项目(505003)

摘　　要：通过统计南海100 m以下深水区的136个沉积柱状样的分析数据,对南海末次冰期以来的堆积速率进行了统计.计算出MIS(marine isotope stage)1期的年均沉积量为152.3 Mt/a,2期的为215.2 Mt/a,主要为陆源物质的贡献.无论在末次冰期还是在冰后期,堆积速率均在南海西南部最高,其次是在东北部,在其他地区较低.由于侧向搬运和顺坡搬运频繁,虽然整体上末次冰期的堆积速率高于冰后期的,但在沉积物高速堆积地区附近有相反的变化趋势.　The accumulation rate has been evaluated based on the dating data of 136 sediment cores taken from areas deeper than 100 m in the South China Sea since the last glaciation.The average annual deposit amount is 152.3 Mt/a during MIS（marine isotope stage） 1 and 215.2 Mt/a during MIS 2 respectively,which are mainly contributed by terrigenous sediments.The accumulation rate is the highest in southwestern continental slopes followed by northeastern area,and lower in other part of the South China Sea during both of the last glaciation and Holocene.Although the accumulation rate during MIS 2 is much higher than that during MIS 1 in most part of the South China Sea,it has opposite trends near the rapidly accumulated areas because of more active side and downslope transport.

关 键 词：南海 堆积速率 末次冰期 冰后期 

分 类 号：P722.7[天文地球—海洋科学] P736.212