Evidence of surface water oligotrophy during the Paleocene-Eocene thermal maximum: Nannofossil assemblage data from Ocean Drilling Program Site 690, Maud Rise, Weddell Sea
Evidence of surface water oligotrophy during the Paleocene-Eocene thermal maximum: Nannofossil assemblage data from Ocean Drilling Program Site 690, Maud Rise, Weddell Sea
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DOI：
10.1029/2001pa000662
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发表时间：
2002-03-01
期刊：
影响因子：
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通讯作者：
Bralower, TJ
中科院分区：
文献类型：
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作者：
Bralower, TJ
[1]大洋钻探计划690号站点（威德尔海莫德海隆）的微型浮游生物组合在古新世-始新世热盛期（PETM）开始时经历了一个突然而戏剧性的转变，时间大约为5500万年。主要的组合变化表明，从寒冷，更富有成效的表面沃茨温暖，更贫营养的条件下的变化。在晚古生代极热时期的后期组合的重大重组表明，nannophlancoma社区是不稳定的，地表水的条件发生了变化，虽然他们仍然温暖和贫营养。结合底栖有孔虫组合的数据，nannophlancoma组合的结果表明，在大陆架环境和饥饿的公海的营养物质的封存增加。虽然PETM是一个短暂的事件，但它似乎对微型浮游生物产生了长期影响，导致了古新世占主导地位的属Fasciculithus的灭绝。
[1] Nannoplankton assemblages at Ocean Drilling Program Site 690 (Maud Rise, Weddell Sea) experienced an abrupt and dramatic transformation at the onset of the Paleocene-Eocene Thermal Maximum (PETM) at similar to55 m.y. The major assemblage shift suggests a change from colder, more productive surface waters to warmer, more oligotrophic conditions. Significant restructuring of assemblages during the later part of the PETM indicates that nannoplankton communities were not stable and that surface water conditions changed, although they remained warm and oligotrophic. Combined with benthic foraminiferal assemblage data, nannoplankton assemblage results suggest increased sequestration of nutrients in shelf environments and starvation of the open ocean. Although the PETM was a short-lived event, it appears to have had long-term effects on nannoplankton, leading to the extinction of Fasciculithus, a dominant Paleocene genus.