A Siliceous Microfossil View of Middle Eocene Arctic Paleoenvironments

A Siliceous Microfossil View of Middle Eocene Arctic Paleoenvironments
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中始新世北极古环境的硅质微化石观

DOI:
10.1029/2007pa001485
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发表时间:
2008
期刊:
影响因子:
--
通讯作者:
Suto I
Suto I
中科院分区:
--
文献类型:
--
作者:
Stickley CE;Koç N;Brumsack H-J;Jordan RW;Suto I

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综合大洋钻探计划(IODP)第302次北极取芯考察(ACEX)发现了近20年来最重要的古近纪硅质微体化石。100米的中始新世早期,富含有机质,精细分层的沉积物含有丰富的海洋和淡水硅质微化石,可以在新生代冷却开始期间对北极中部的古环境进行有趣的见解。海洋硅藻和ebridians的larvae特有的组合被保存沿着与非常高丰度的金藻孢囊,内生形成的淡水藻类的休息阶段。一个整体的半咸水环境调用,但组优势的变化表明,在盐度,分层和营养状态的变化。在无机地球化学的支持下,我们通过假设这些不同硅质微体化石群共存的环境模型来合成沉积物特征。我们还报告了一些叠层的组成的初步见解,这可能有助于解释这个丰富的沉积物档案的形成。
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.
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