摘要
对西南极阿蒙森海A11-02孔沉积物进行粒度和地球化学元素分析,示踪了阿蒙森海沉积物来源,重建了中全新世以来的古气候演化历史。通过对稀土元素北美页岩平均标准化配分曲线以及(La/Yb)_(N)、(Gd/Lu)_(N)、(La/Sm)_(N)等参数的分析和对比,认为A11-02孔沉积物主要来源于玛丽伯德地,而别林斯高晋海也有一定贡献。通过将化学蚀变指数、Na/K、<22.1μm粒级组分含量以及>63μm粒级组分含量等相关替代指标与其他古气候记录对比,识别出中全新世以来在阿蒙森海存在4个明显的寒冷阶段(P1 P4)。在时间和空间上,南极地区千年尺度的气候变化具有一致性,主要受日照强度变化和大气环流变化控制。
Grain size and geochemical analyses were carried out on sediment core samples from core A11-02 in the Amundsen Sea,West Antarctic to trace the sediment sources and reconstruct the history of paleoclimatic evolution since the mid-Holocene.By analyzing and comparing the North American Shale Composite normalized rare earth element(REE)patterns and indicators such as(La/Yb)_(N),(Gd/Lu)_(N) and(La/Sm)_(N),we concluded that the core sediments mainly originate from the Marie Byrd Land,with contributions,to some extent,from the Bellingshausen Sea.By multi-index analysis comparing the Chemical Index of Alteration,Na/K ratio and grain contents for grain sizes less than 22.1μm or greater than 63μm with other paleoclimate records,we identified four distinct cooling phases in the Amundsen Sea since the mid-Holocene.We found the millennial-scale climate changes are temporally and spatially consistent across the Antarctic and mainly controlled by changes in insolation and atmospheric circulation.
作者
雷子炎
葛倩
陈东
张泳聪
韩喜彬
叶黎明
边叶萍
许冬
LEI Ziyan;GE Qian;CHEN Dong;ZHANG Yongcong;HAN Xibin;YE Liming;BIAN Yeping;XU Dong(Key Laboratory of Submarine Geosciences,Ministry of Natural Resources,Hangzhou 310012,China;Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China)
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2022年第4期179-190,共12页
Earth Science Frontiers
基金
自然资源部专项“南极重点海域对气候变化的响应和影响(IRASCC2020-2022)”。
关键词
阿蒙森海
粒度
地球化学元素
物源
古气候
Amundsen Sea
grain size
geochemical elements
sediment provenance
paleoclimate
