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首页> 外文期刊>Journal of nannoplankton research: A publication of the International Nannoplankton Association >Middle to late Eocene paleoenvironmental changes from the northern Tethyan margin (Adelholzen, Germany) traced by calcareous nannoplankton
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Middle to late Eocene paleoenvironmental changes from the northern Tethyan margin (Adelholzen, Germany) traced by calcareous nannoplankton

机译：中间到期宫殿古环境从北极尼北部（阿德霍尔岑，德国）追溯到钙质纳诺克兰顿

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摘要

The northern Tethyan margin is a key region for determining environmental changes associated with the collision of continental and oceanic tectonic plates during the Alpine orogeny. We investigated middle to upper Eocene sediments of neritic to bathyal origin that were deposited during an interval of unstable climatic conditions. The section at Adelholzen covers an almost complete Lutetian Stage (calcareous nannofossil Zones NP15a-16, planktic foraminiferal Zones E8-11, and shallow benthic Zones SBZ13-15) and large parts of the Priabonian Stage (Zones NP18-20 and E14/15), while the intermediate Bartonian Stage (Zone NP17) is completely missing. All investigated samples contain very well preserved and abundant autochthonous calcareous nannoplankton assemblages and only very low percentages of reworked nannoplankton. The succession of assemblages reflects the transition from the relatively stable shallow-water conditions with low nutrient availability (high relative abundances of Cyclicargolithus floridanus) during the deposition of the lower and middle Adelholzen Beds (early Lutetian) to the highly variable conditions of the upper Adelholzen Beds (late Lutetian).
机译：北·塞泰安·裕金净额是确定与大陆organy期间欧洲和海洋构造板碰撞相关的环境变化的关键区域。我们研究了中部到上神经内酯沉积物，以在不稳定的气候条件的间隔期间沉积的囊沉积物。阿德霍尔森的部分涵盖了几乎完全的卢特蒂亚舞台（钙质Nannofossil区NP15A-16，Planktic Forminiferaerate E8-11，浅底地区SBZ13-15）和价格的大部分地区（地区NP18-20和E14 / 15） ，而中间Bartonian阶段（区域NP17）完全缺失。所有研究的样品均含有非常完善的保存和丰富的自身加热的钙质纳尼塞尔顿集会，并且只有非常低的纳尼纳泊塞顿百分比。组合的继承反映了在下部和中间和中间的储层床（早期的Lutetian）到上部Adelhtzen的高度可变条件期间，从相对稳定的浅水条件（环床狼疮高度丰富的佛罗里达州的高度丰富）的过渡床（晚卢特）。

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