巴里米亚晚期环境加速变化的新证据:来自亚贝特盆地(特提斯西部)的地球化学和古生物学记录

Ginés A. de Gea, J. M. Castro, M. Company, L. O’Dogherty, José Sandoval, María Luisa Quijano, Cristina Sequero, Sandro Froehner, R. Aguado
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摘要

我们研究了在巴里米亚盆地(西特提斯)深海晚期发生的新的环境加速变化事件。我们采用基于 C-同位素地层学的多代理方法、对化石组合的高分辨率定量研究以及主要和痕量元素和生物标志物,对两个浮游剖面进行了研究。我们的研究结果提供了详细的生物地层学和 C-同位素地层学,并概述了 Taxy 事件早期记录的古环境条件。在 C-同位素记录中发现了一个干扰,称为 IFeNE(Intra-Feradianus 负 C-excursion),它与众所周知的 ISNE(Intra-Sarasini 负 C-excursion)之前的环境和生物变化同时发生。对化石组合、碳同位素、主要元素和痕量元素以及生物标志物分布的综合分析表明,在 ISNE 出现之前,曾发生过一次单独的气候变暖,导致水文循环加速,大陆输入量随之增加,地表水得到肥沃化。Taxy事件(IFeNE和ISNE)的起源与轨道因素(高偏心周期)和全球火山活动的增加有关,可能与翁通爪哇海台的早期阶段有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
New Evidence for an Episode of Accelerated Environmental Change in the Late Barremian: Geochemical and Paleontological Records from the Subbetic Basin (Western Tethys)
We investigate a new event of accelerated environmental change that was recorded during the late Barremian in the pelagic Subbetic Basin (Western Tethys). Two pelagic sections have been studied using a multi-proxy approach based on C-isotope stratigraphy and a high-resolution quantitative study of nannofossil assemblages, along with major and trace elements and biomarkers. Our results provide a detailed biostratigraphy and C-isotope stratigraphy, and outline the paleoenvironmental conditions recorded during the early stages of the Taxy Episode. A disturbance has been identified in the C-isotope record, called the IFeNE (Intra-Feradianus negative C-excursion), which is coeval with environmental and biotic changes that predate the well-known ISNE (Intra-Sarasini negative C-excursion). The combined analysis of nannofossil associations, C-isotopes, major and trace elements, and biomarker distributions indicates a separate episode of warming heralding the ISNE, resulting in the acceleration of the hydrological cycle and a consequent increase in continental inputs and the fertilization of surface waters. The origin of the Taxy Episode (the IFeNE and ISNE) has been related to orbital factors (high-eccentricity cycles), and to a global increase in volcanism, probably related to the early phases of the Ontong Java Plateau.
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