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首页> 外文期刊>Paleoceanography >A siliceous microfossil view of middle Eocene Arctic paleoenvironments: A window of biosilica production and preservation
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A siliceous microfossil view of middle Eocene Arctic paleoenvironments: A window of biosilica production and preservation

机译：中新世北极古环境的硅质微化石观点：生物硅生产和保存的窗口

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Integrated Ocean Drilling Program (IODP) Expedition 302, "The Arctic Coring Expedition'' (ACEX), unearthed the most significant find of Paleogene siliceous microfossils in nearly 2 decades. 100 m of early middle Eocene, organic-rich, finely laminated sediments contain abundant marine and freshwater siliceous microfossils allowing intriguing insights into central Arctic paleoenvironments during the start of Cenozoic cooling. Largely endemic assemblages of marine diatoms and ebridians are preserved along with very high abundances of chrysophyte cysts, the endogenously formed resting stage of freshwater algae. An overall brackish environment is invoked, but variations in group dominance suggest episodic changes in salinity, stratification, and trophic status. With the backing of inorganic geochemistry we synthesize the sediment characteristics by hypothesizing an environmental model for the cooccurrence of these diverse siliceous microfossil groups. We also report on initial insights into the composition of some of the laminations, which may help explain the formation of this rich sediment archive.
机译：综合海洋钻探计划（IODP）远征302，“北极取心远征”（ACEX），发现了近20年来最古老的古近纪硅质微化石，其中100 m始于始新世中期，富含有机物，精细层压的沉积物丰富的海洋和淡水硅质微化石，使人们对新生代冷却开始时的北极古环境感兴趣，保留了大量的海洋硅藻和ebridian特有种，以及非常丰富的金藻类囊肿，这是淡水藻类的内源性安息阶段。引入了微咸的环境，但是群体优势的变化表明了盐度，分层和营养状态的周期性变化，在无机地球化学的支持下，我们通过为这些不同的硅质微化石群共同存在的环境模型合成了沉积物特征。报告关于以下方面的初步见解一些叠片的组成，这可能有助于解释这种丰富的沉积物档案的形成。

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