Radiolarian biostratigraphy in the Southern Bering Sea since Pliocene
Radiolarian biostratigraphy in the Southern Bering Sea since Pliocene
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上新世以来南白令海放射虫生物地层学
DOI：
10.1007/s11430-013-4717-z
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发表时间：
2014-04-01
影响因子：
5.7
通讯作者：
Hu WeiFen
中科院分区：
文献类型：
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作者：
Zhang Qiang;Chen MuHong;Hu WeiFen
利用白令海南部604m深的IODP U1340站位的样品，分析了上更新世以来详细的放射虫生物地层学。共鉴定出102属227种。根据U1340站位放射虫指数种的分布，首次在白令海南部建立了5个上新世以来的放射虫带，共识别出25个放射虫生物事件。根据有效生物地层和磁性地层事件的综合资料构建的年龄-深度图，估算了它们的年龄。对U1340站位的放射虫带与邻区早上新世晚期以来的放射虫带进行了系统的对比，进一步完善和解释了北太平洋中高纬度的生物地层基准及其对比。此外，放射虫带的比较结果表明，本文所推荐的水生葡萄孢子虫带相当于Hays，1970，Druppatractus inrularis-Dorydrappa bensoni带和海绵盘藻所定义的相同带的上部。本文新提出的带分别与亚北极北太平洋的Sakaia Cycladhora Skaii带和Stylatractus unisus带具有很好的相关性。
Detailed radiolarian biostratigraphy in the Plio-Pleistocene was analyzed by using samples from IODP Site U1340 that was drilled to a core depth of 604 m in the southern Bering Sea. A total of 227 species belonging to 102 genera were identified. Based on the distributions of the radiolarian index species at Site U1340, five radiolarian zones since the Pliocene were established in the southern Bering Sea for the first time, and 25 radiolarian bioevents were recognized. Their ages were estimated on the basis of the age-depth plot that was constructed by the synthetical datum of the effective biostratigraphic and magnetostratigraphic events. The radiolarian zones at Site U1340 were systematically compared with those in its adjacent regions since the late Early Pliocene, which further improved and interpreted the biostratigraphic datum as well as their correlations in the middle-high latitude of the North Pacific. In addition, the comparative results of radiolarian zones show that Botryostrobus aquilonaris Zone emended in this paper is equivalent to the upper part of the same zone defined by Hays, 1970, and Druppatractus irregularis-Dorydruppa bensoni Zone as well as Spongodiscus sp. Zone, newly proposed in this paper, are well correlated with Cycladophora sakaii Zone and Stylatractus universus Zone in the subarctic North Pacific, respectively.