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白令海特征区域的表层沉积硅藻分布及其古海洋学意义

, PP. 106-113

Keywords: 硅藻,海冰,亚北极,白令海

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Abstract:

对白令海表层沉积物样品进行硅藻分析,共鉴定硅藻30属56种(含变种),并确定17种硅藻新记录,其中包括Kisseieviellacarina等3种化石种。白令海表层沉积物中的硅藻优势种为Neodenticulaseminae,Fragilariopsiscylindrus和Fragilariopsisoceanica,在白令海北部陆坡深水区附近以Neodenticulaseminae为主,而在白令海北部陆架以Fragilariopsiscylindrus和Fragilariopsisoceanica为主。对硅藻结果进行聚类分析,可以划分出3个硅藻组合,硅藻组合Ⅰ代表海冰种硅藻组合,组合Ⅱ代表受阿拉斯加流影响的大洋浮游硅藻组合,组合Ⅲ代表上述两个硅藻组合之间的过渡组合。Fossulaarctica是17种硅藻新记录之一,首次记录于白令海表层沉积物中,其百分含量分布趋势与Fragilariopsiscylindrus和Fragilariopsisoceanica的相近,在白令海北部陆架为11.7%~17.1%,而在陆坡深水区附近明显减少,是继Fragilariopsiscylindrus和Fragilariopsisoceanica之后白令海又一海冰指示种,并有望成为一种有效的海冰变化替代物运用于晚第四纪以来白令海海冰进退历史研究。

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