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西北冰洋楚科奇海台P31孔晚第四纪的陆源沉积物记录及其古海洋与古气候意义

梅静 王汝建 陈建芳 程振波 陈志华 孙烨忱

梅静, 王汝建, 陈建芳, 程振波, 陈志华, 孙烨忱. 西北冰洋楚科奇海台P31孔晚第四纪的陆源沉积物记录及其古海洋与古气候意义[J]. 海洋地质与第四纪地质, 2012, 32(3): 77-86. doi: 10.3724/SP.J.1140.2012.03077
引用本文: 梅静, 王汝建, 陈建芳, 程振波, 陈志华, 孙烨忱. 西北冰洋楚科奇海台P31孔晚第四纪的陆源沉积物记录及其古海洋与古气候意义[J]. 海洋地质与第四纪地质, 2012, 32(3): 77-86. doi: 10.3724/SP.J.1140.2012.03077
MEI Jing, WANG Rujian, CHEN Jianfang, CHENG Zhenbo, CHEN Zhihua, SUN Yechen. LATE QUATERNARY TERRIGENOUS DEPOSITS FROM CORE P31 ON THE CHUKCHI PLATEAU OF WESTERN ARCTIC OCEAN AND THEIR PALEOCEANOGRAPHIC AND PALEOCLIMATIC IMPLICATIONS[J]. Marine Geology & Quaternary Geology, 2012, 32(3): 77-86. doi: 10.3724/SP.J.1140.2012.03077
Citation: MEI Jing, WANG Rujian, CHEN Jianfang, CHENG Zhenbo, CHEN Zhihua, SUN Yechen. LATE QUATERNARY TERRIGENOUS DEPOSITS FROM CORE P31 ON THE CHUKCHI PLATEAU OF WESTERN ARCTIC OCEAN AND THEIR PALEOCEANOGRAPHIC AND PALEOCLIMATIC IMPLICATIONS[J]. Marine Geology & Quaternary Geology, 2012, 32(3): 77-86. doi: 10.3724/SP.J.1140.2012.03077

西北冰洋楚科奇海台P31孔晚第四纪的陆源沉积物记录及其古海洋与古气候意义


doi: 10.3724/SP.J.1140.2012.03077
详细信息
    作者简介:

    梅静(1990-),女,本科生,海洋地质专业,E-mail:meijing0315@126.com

  • 基金项目:

    国家重点基础研究发展规划项目(2012CB957700)

    南北极环境综合考察与评估专项(CHINARE2012-03-02)

    中国地质调查局项目(水[2012]01-011-05)

    国家自然科学基金重点项目(41030859)

  • 中图分类号: P736.22

LATE QUATERNARY TERRIGENOUS DEPOSITS FROM CORE P31 ON THE CHUKCHI PLATEAU OF WESTERN ARCTIC OCEAN AND THEIR PALEOCEANOGRAPHIC AND PALEOCLIMATIC IMPLICATIONS

More Information
  • 摘要: 通过对北冰洋西部楚科奇海台P31孔沉积物进行岩性特征和颜色旋回分析、XRF元素扫描、AMS14C测年、有孔虫丰度统计、筏冰碎屑(IRD)(>250和>154 μm)含量分析以及粒度组成的综合研究,建立了该孔的地层年代框架,其沉积物被划分为MIS 3-MIS 1的沉积序列。自MIS 3以来,楚科奇海台P31孔可以识别出5个IRD事件,它们分别出现在晚MIS 1、MIS 2和早中MIS 3期。这些IRD主要被来自加拿大北极群岛的冰山或者大块冰所携带,随波弗特环流搬运至楚科奇海台并卸载到海底,这不仅反映了晚第四纪冰期-间冰期旋回中北美冰盖的崩塌事件,还反映了波弗特环流的变化历史。粒度组分变化表明,细砂级组分主要来自于冰山或大冰块的搬运,因为其高值对应于IRD的高值,粉砂级组分可能主要来自于海冰的搬运,而黏土级组分主要由波弗特环流和雾状层所搬运。两个敏感组分(5~13和110~176 μm)含量的变化呈现明显对称性分布,后者的变化对应于IRD的变化,前者可能指示了物源和沉积作用后期的影响。该孔MIS3-MIS1的沉积速率分别为2.2、0.16和1.6 cm/ka,平均沉积速率约为1.2 cm/ka。与北冰洋其他海区沉积速率资料对比显示,海冰边缘地区沉积速率较高,而永久性海冰覆盖区沉积速率低较。水深越浅,越靠近陆架物源区,沉积速率越高,纬度越高的门捷列夫-阿尔法脊和加拿大海盆区,沉积速率越低。
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西北冰洋楚科奇海台P31孔晚第四纪的陆源沉积物记录及其古海洋与古气候意义

doi: 10.3724/SP.J.1140.2012.03077
    作者简介:

    梅静(1990-),女,本科生,海洋地质专业,E-mail:meijing0315@126.com

基金项目:

国家重点基础研究发展规划项目(2012CB957700)

南北极环境综合考察与评估专项(CHINARE2012-03-02)

中国地质调查局项目(水[2012]01-011-05)

国家自然科学基金重点项目(41030859)

  • 中图分类号: P736.22

摘要: 通过对北冰洋西部楚科奇海台P31孔沉积物进行岩性特征和颜色旋回分析、XRF元素扫描、AMS14C测年、有孔虫丰度统计、筏冰碎屑(IRD)(>250和>154 μm)含量分析以及粒度组成的综合研究,建立了该孔的地层年代框架,其沉积物被划分为MIS 3-MIS 1的沉积序列。自MIS 3以来,楚科奇海台P31孔可以识别出5个IRD事件,它们分别出现在晚MIS 1、MIS 2和早中MIS 3期。这些IRD主要被来自加拿大北极群岛的冰山或者大块冰所携带,随波弗特环流搬运至楚科奇海台并卸载到海底,这不仅反映了晚第四纪冰期-间冰期旋回中北美冰盖的崩塌事件,还反映了波弗特环流的变化历史。粒度组分变化表明,细砂级组分主要来自于冰山或大冰块的搬运,因为其高值对应于IRD的高值,粉砂级组分可能主要来自于海冰的搬运,而黏土级组分主要由波弗特环流和雾状层所搬运。两个敏感组分(5~13和110~176 μm)含量的变化呈现明显对称性分布,后者的变化对应于IRD的变化,前者可能指示了物源和沉积作用后期的影响。该孔MIS3-MIS1的沉积速率分别为2.2、0.16和1.6 cm/ka,平均沉积速率约为1.2 cm/ka。与北冰洋其他海区沉积速率资料对比显示,海冰边缘地区沉积速率较高,而永久性海冰覆盖区沉积速率低较。水深越浅,越靠近陆架物源区,沉积速率越高,纬度越高的门捷列夫-阿尔法脊和加拿大海盆区,沉积速率越低。

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