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地球科学进展  2017, Vol. 32 Issue (12): 1287-1296    DOI: 10.11867/j.issn.1001-8166.2017.12.1287
大洋钻探科学目标展望     
等积体在全球大洋中的空间分布及其古环境意义——国际大洋钻探计划对全球等深流沉积研究的贡献
赵玉龙(), 刘志飞
同济大学海洋地质国家重点实验室,上海 200092
Spatial Distribution of Contourites in Global Ocean and Its Paleoclimatic Significance—The Contribution of International Ocean Drilling to the Studies of Contourites
Yulong Zhao(), Zhifei Liu
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
 全文: PDF(8733 KB)   HTML
摘要:

等积体是海洋沉积最重要的类型之一,通常记录了长期的高分辨率古环境和古海洋演化信息,同时对海洋工程和油气开发等领域具有重要意义。通过对全球大洋进行钻探取芯和地球物理勘探,国际大洋钻探计划,尤其是最新阶段的“综合大洋钻探计划(IODP)”和 “国际大洋发现计划(IODP)”,在理解等积体的全球分布特征及其揭示的古环境和古海洋演化信息方面做出了巨大的贡献。研究显示,等积体在全球大洋中的空间分布主要受大洋深层环流的影响,但在特定海区的沉积和分布则受到构造活动、深层海流强度和沉积物供应等多种因素的影响。全球深层海流强度的变迁则受到气候变化,如新生代全球变冷、北半球冰盖扩张、季风强度演变以及构造活动和水团来源等因素的影响,不同海区的主要影响因素也有所不同。

关键词: 等深流等积体国际大洋钻探计划(DSDP/ODP/IODP)深层西部边界流(DWBC)地中海溢出流(MOW)    
Abstract:

Contourite is one of the most important type of sediments in the global ocean, which has recorded significant information on paleoclimatic changes. It is also of great importance for ocean engineering and marine hydrocarbon exploration. The development of scientific ocean drilling, especially the “Integrated Ocean Drilling Program” and the undergoing “International Ocean Discovery Program”, has made great contribution in mapping the spatial distribution of contourites and revealing contourite-related paleoclimatic information, through coring and geophysical exploration in the global ocean. It is found that the global distribution of contourites is controlled predominantly by the global deep-water circulation while its distribution in a specific region can be affected by the intensity of deep currents, tectonic activities, sediment supply, and so on. The geological changes in the global deep-water circulation is, however, further affected by tectonic activities, origins of water masses, as well as climate changes, e.g. the Cenozoic global cooling, changes in the size of the northern hemisphere ice caps, and intensity of monsoon. The main controlling factors of deep water circulation vary with different regions.

Key words: Contour currents    Contourite    Scientific ocean drilling    Deep Western Boundary Current    Mediterranean Outflow Water.
收稿日期: 2017-10-16 出版日期: 2018-03-06
ZTFLH:  P736.2  
基金资助: *国家自然科学基金面上项目“南海东北部末次冰期以来古海流强度的重建——沉积学和地球化学方法”(编号:41776047);国家自然科学基金重大研究计划集成项目“南海深海沉积过程与机制”(编号:91528304)资助.
作者简介:

作者简介:赵玉龙(1982-),男,内蒙古乌兰察布人,副教授,主要从事海洋沉积学和古环境研究.E-mail:yeoloon@tongji.edu.cn

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引用本文:

赵玉龙, 刘志飞. 等积体在全球大洋中的空间分布及其古环境意义——国际大洋钻探计划对全球等深流沉积研究的贡献[J]. 地球科学进展, 2017, 32(12): 1287-1296.

Yulong Zhao, Zhifei Liu. Spatial Distribution of Contourites in Global Ocean and Its Paleoclimatic Significance—The Contribution of International Ocean Drilling to the Studies of Contourites. Advances in Earth Science, 2017, 32(12): 1287-1296.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2017.12.1287        http://www.adearth.ac.cn/CN/Y2017/V32/I12/1287

图1  国际大洋钻探计划(DSDP,ODP及IODP)在全球等积体上进行的钻探站位及全球等积体的空间分布(据参考文献[7]修改) 深蓝色点显示DSDP站位,深绿色点显示ODP站位,洋红色点显示IODP站位;字母(A~N)标示的灰色阴影区显示等积体在全球大洋中的主要分布区域;半透明箭头显示全球深层水的主要运移路径,其中末端叉形点显示表层水下沉的位置,而圆点则显示深层水上翻的位置
全球
分布
区域
分布
等积体
形态
等积体
规模
全球大洋环流
区域深层环流
地形地貌
水深
沉积物供应
构造运动
海平面变化
表1  等积体在全球大洋中空间分布的主要影响因素
图2  构造活动控制的地中海溢出流(MOW)自早上新世以来的变化(据参考文献[23]修改)
图3  北大西洋深层环流及主要的等积体分布(据参考文献[15]修改) 本文涉及的等积体为红色字体
图4  现代太平洋深层环流示意图(据参考文献[38]修改) 蓝色线条显示深层环流路径,洋红色线条强调太平洋DWBC的主要路径[39,40]
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