南海沉积物总量的统计：方法与结果

doi:10.11867/j.issn.1001-8166.2006.05.0465

地球科学进展 ›› 2006, Vol. 21 ›› Issue (5): 465 -473. doi: 10.11867/j.issn.1001-8166.2006.05.0465

所属专题： IODP研究；

南海沉积物总量的统计：方法与结果

黄维,汪品先

同济大学海洋地质国家重点实验室，上海 200092

收稿日期:2006-03-30 修回日期:2006-04-20 出版日期:2006-05-15
通讯作者: 黄维 E-mail:huangwk@online.sh.cn
基金资助:
国家自然科学基金创新研究群体科学基金项目“西太平洋暖池与东亚古环境——沉积记录的海陆对比”(编号：40321603)；国家自然科学基金重点项目“南海中更新世气候转型期千年尺度气候波动及其全球意义”(编号：40331002)；国家自然科学基金项目“深海沉积物理性质用于高分辨率古气候研究的探索”(编号：40506014)和“南海东北深海高沉积速率区的陆源源区分析”（编号：40276019）；教育部科技基础条件平台项目“海洋地质环境数据整合及共享信息平台”(编号：505003)；科技基础性工作和社会公益研究专项“中国综合大洋钻探计划预研究”（编号：2003DIB3J114）资助.

The Statistics of Sediment Mass in the South China Sea: Method and Result

Huang Wei, Wang Pinxian

State Key Laboratory of Marine Geology, Shanghai 20092, China

Received:2006-03-30 Revised:2006-04-20 Online:2006-05-15 Published:2006-05-15

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通过收集包括大洋钻探钻井岩芯在内的大量地质地球物理资料，获得了南海的沉积物厚度分布格局，并统计了自渐新世以来的沉积总量以及E₃、N¹₁、N²₁、N³₁、N₂、Q各时期的沉积量。结果表明，在前渐新世基底之上，南海海盆中共有7.01×10⁶ km³的沉积物，总质量为1.44×10¹⁶吨。以渐新世33 Ma的年龄计，南海的平均堆积速率是12.8 g/(cm²·ka)。南海沉积物主要堆积在陆架和陆坡上，中央海盆的沉积总量不及全部的5%。陆架和陆坡上发育的沉积盆地，如果以沉积厚度2 km为边界，则只占南海总面积的34%，却堆积了南海沉积总量的82%，表明沉积盆地是南海接受沉积物的主体。晚渐新世是南海沉积量最大、堆积速率最高的时期，与全球沉积速率演变有明显差异，显示出边缘海盆地的沉积作用，首先受该地构造作用的控制。

关键词: 沉积量, 堆积速率, 渐新世, 南海

Based on a great deal of geological and geophysical data including ODP borehole data in the South China Sea (SCS), the figures of sediment pattern were developed and the mass volume was calculated both of the whole basin and during each stage of E₃, N¹₁, N²₁, N³₁, N₂, Q. Above the pre-Oligocene base, the sediment volume of SCS was 7.01×10⁶ km³ and the mass was 1.44×10¹⁶ t, and the average sediment rate was 6.22 cm/ka and accumulation rate was 12.8 g/cm²/ka since Oligocene. Most of the sediment deposited on the continent shelf and slope, while only 5% of total mass deposited in the Center Basin. The sediment basin, developed in the continent shelf and slope, occupied 34% of the whole area of SCS given the thickness contour 2000 m as the boundary, but more than 82% of total amount mass deposited in these basin, showing that sediment basin was the major part of sedimentary process in SCS. The sediment rates were the highest and the mass volume was the largest in SCS during Oligocene, which was quite different from the evolution of global sediment rates, and it can be concluded that the deposition of marginal seas is controlled by the local tectonic movement firstly.

Key words: Mass volume, Accumulation rate, Oligocene, South China Sea.

中图分类号:

P736.21

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