极地研究

极地研究

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南极半岛鲍威尔海盆南部氧同位素3期以来沉积动力环境演变

王百顺1 陈志华2  王西蒙1 吴少林1 戴清清1   

  1. 1国家海洋局东海分局，上海200137； 2国家海洋局第一海洋研究所，青岛266061
  • 出版日期:2014-03-30 发布日期:2014-03-30

THE SEDIMENTARY HYDRODYNAMIC ENVIRONMENT OF THE NORTH POWELL BASIN, ANTARCTIC PENINSULA SINCE MIS 3

Wang Baishun1，Chen Zhihua2，Wang Ximeng1，Wu Shaolin1， Dai Qingqing1   

  1.  
    1 East China Sea Branch, SOA, Shanghai 200137, China;

    2 The First Institute of Oceanography, SOA, Qingdao, 266061, China

  • Online:2014-03-30 Published:2014-03-30

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摘要： 本文基于威德尔海西北侧海域D3-7沉积岩芯粒度分析数据，采用粒度累积概率曲线、散点图和CM图来研究古沉积环境，其中CM图效果更好。结果表明，构成D3-7岩芯的各种碎屑在搬运到研究区至沉积到海底前呈静水悬浮状态；首次按照古沉积水动力环境条件，将威德尔海西北侧海域沉积演化分成四个阶段，从单一静水沉积方式→多种沉积方式→单一方式→多种沉积方式，发现演化具有循环性特征。剖面中的粗组份搬运过程中需要较大的启动能量，推断物源和搬运与冰筏作用、火山活动有关。

关键词: 南大洋, 威德尔海, 氧同位素3期, D3-7沉积岩芯, 粒度, 古沉积环境

Abstract: Based on the grain size systematic analysis of D3-7 sedimentary column, including grain size probability diagram, size parameter scatter diagrams, and CM patterns, the palaeosedimentary environment of the Northwest Weddell Sea since MIS3 is studied. The results show that the sediment mainly exists in the form of hydrostatic suspension status before arriving sea bottom. The sedimentary hydrodynamic environment can divided into four stages, with cyclic characteristics. The first stage is from 33.4-35.0ka, between 241-319cm(bottom of D3-7),and belongs to single hydrostatic suspended deposition. The second stage is from 29.6-33.4ka, between 143-241cm,and belongs to multi hydrostatic suspended deposition. The third stage is from 26.8-29.6ka, between 52-143cm, and belongs to single hydrostatic suspended deposition again. The fourth stage is from 0-26.8ka, between top of D3-7 and 52cm, and belongs to multi hydrostatic suspended deposition. The transport of coarse sediments requires large starting power, inferred some sediment provenance linked to ice rafting and volcanic activity.

Key words: South Ocean, Powell Basin, MIS 3, D3-7 column, grain size, palaeosedimentary environment