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首页> 外文期刊>Geologica Carpathica >Changes in the composition of trace fossil assemblages across the Paleocene-Eocene transition in the north-western Tethys (Untersberg section, Austria)
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Changes in the composition of trace fossil assemblages across the Paleocene-Eocene transition in the north-western Tethys (Untersberg section, Austria)

机译：北西部Thethys（Untersberg Section，奥地利）古典 - 群体过渡的痕量化石组合组成的变化

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摘要

The Untersberg section (Northern Calcareous Alps, Austria) provides an expanded and biostratigraphically well constrained deep-sea record of the Paleocene-Eocene transition in the north-western Tethyan realm. At the base of the Eocene, massive carbonate dissolution and a shoaling of the calcite compensation depth (CCD) by at least 1 Ian is recorded by 5.5 m-thick red claystone, which is intercalated into a grey marlstone succession. Previous studies documented the benthic foraminifera extinction event (BEE) in this claystone. Now biodeformational structures and trace fossils were investigated in this interval to evaluate the impact of the extinction event on the macrobenthic tracemaker fauna. Using the stratigraphic distribution pattern of trace fossils, the lowermost Eocene claystone can be subdivided into three parts: (1) the lower part shows a trace fossil assemblage consisting of Chondrites isp., Planolites isp., Thalassinoides isp., and Zoophycos isp., (2) the middle part is characterized by primary sedimentary lamination and exceedingly rare ichnofossils, and (3) the upper part shows a less abundant and less diverse trace fossil assemblage than the lower part, indicating a slow recovery of the macrobenthic tracemaker community. This pattern demonstrates that macrobenthic communities were severely affected by the ecological perturbations in the earliest Eocene. The change in sediment colouration towards red colour in the middle part of the Paleocene-Eocene transition at the Untersberg section, together with decrease in bioturbation degree indicate that oxygen consumption was rather reduced during the PETM, and the loss in bioturbation is thus unrelated to oxygen limitation. Trace fossils can be used to improve the resolution of the benthic extinction interval and provide an excellent proxy for the precise determination of timing of the climax of this global event.
机译：奥斯伯格部分（北钙质阿尔卑斯山，奥地利）提供了北西北部宫廷皇宫古世教转型的扩展和生物数据良好的深海记录。在eocene的基础上，碳酸盐补偿深度（CCD）的大规模碳酸盐溶解和浅层的溶解，至少1伊恩记录了5.5米厚的红色粘土石，其嵌入到灰色的马赛尔通道中。以前的研究记录了该粘土石的底栖特征灭绝事件（蜜蜂）。现在，在这种间隔中研究了生物情形结构和痕量化石，以评估灭绝事件对宏观表演追逐赛事的影响。利用痕量化石的地层分布模式，最低生物粘土石可以细分为三个部分：（1）下部显示由Chondrites ISP组成的痕量化石组合。，Planolites ISP。，Thalassinoides ISP。， （2）中间部分的特征在于初级沉积层压，非常罕见的ICHNOOFSIS，（3）上部显示比下部更少于且较少多样化的痕量化石组合，表明Macrocenthic Tracemaker群落的缓慢恢复。这种模式表明，最早的eocene中的生态扰动严重影响了宏观症杂志。沉积物沉积物沉积物调情在奥尔伯格段古茂族转型中的中间部分中的红色，以及生物干扰程度的降低表明，在PETM期间氧气消耗相当降低，因此生物干扰的损失与氧气无关局限性。追踪化石可用于改善围堰消灭间隔的分辨率，并提供了精确确定这一全球事件的高潮时间的优异代理。

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