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中文摘要：
对我国首次在西太平洋挑战者深渊采集的硅藻软泥沉积物开展硅藻分析,结果表明硅藻软泥由数量巨大的大筛盘藻[Ethmodiscus rex（Rattray）Hendey]碎片组成,并伴生有少量热带远洋浮游种类硅藻。硅藻软泥属于大筛盘藻软泥类型,推测可能形成于更新世中后期,代表着大规模E.rex勃发事件发生。其形成机制与冰期时段南极深层水入侵西北太平洋增加水体硅含量、减弱硅藻溶蚀作用,并补充次表层水体硅含量而激发E.rex竞争优势密切相关。本文为理解低纬度海沟区硅藻微体生物随全球气候和区域海洋环境变迁而发生显著变化提供了基础材料。
英文摘要：
According to the diatom analysis of ooze from the surface sediments collected for the first time by the Chinese research vessel in the Challenger Deep of western Pacific Ocean,it is reognized that the ooze belongs to the Ethmodiscus rexooze type,which contained large quantities of Ethmodiscus rex with fragments and accompanied with few tropical open ocean planktonic fossil diatoms.The ooze could be of the Middle-Late Pleistocene in age.These special ooze indicated the diatomE.rexevent had been occurred during a vast blooming,which possibly relatied to the Antarctic intermediate water invasion to the northwest Pacific Ocean to enhanced the silica content and to reduced the diatom dissolution.This research gives a case study that the silica micropaleontological evolution in the low latitude was influenced by the global climate and regional marine environment changes.
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