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首页> 外文期刊>Journal of nannoplankton research: A publication of the International Nannoplankton Association >Miocene Andean uplift and its impact on planktonic communities in eastern equatorial Pacific basins
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Miocene Andean uplift and its impact on planktonic communities in eastern equatorial Pacific basins

机译：中新世安第斯山脉隆升及其对赤道东太平洋盆地浮游生物的影响

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摘要

An interaction between morphotectonic/climatic processes in the northern Andes (uplift, erosional exhumation, and orographic barrier development) and ocean circulation dynamics in the eastern equatorial Pacific (EEP) was interpreted for the Miocene development of orogenic systems and forearc basins of western Colombia. Following a detailed biostratigraphic and biochronological study, a detailed analysis of oceanic microfossil assemblages (calcareous nannofossils, planktonic foraminifers, and diatoms) was compared with continental proxies (thermo-chronology and pollen), revealing patterns that are indicative of coupling among morphotectonic,climatic, and oceanic dynamic systems. Marked shifts in sedimentation rates for EEP basins, such as the Guatemala, Colombian, and Panamá Basins, in conjunction with uplift/exhumation-driven cooling events of cordilleran massifs of the western Cordillera, are associated with discrete pulses of Andean topographic build-up between 18 and 10 Ma. As a consequence of these' morphotectonic events, significant changes in rainfall intensity/distribution (enhanced orographic effects) and erosional efficiency of the drainage network resulted in increased input of terrigenous materials into EEP basins. In addition, we identified an increase in the oceanic productivity after ~12 Ma that is linked to the reorganization of oceanic circulation and/ or variation in the continental input of biolimiting nutrients. This new information that was obtained from the forearc basins of Colombia provides a complex signal of continental, oceanic, and climatic factors that influenced the EEP evolution during the Miocene.
机译：哥伦比亚西部的造山系统和中前陆盆地的中新世发育解释了安第斯山脉北部的构造/气候过程（隆升，侵蚀性掘出和地形障碍发展）与赤道东太平洋（EEP）的海洋环流动力学之间的相互作用。经过详细的生物地层学和生物年代学研究，将海洋微化石组合（钙质纳米化石，浮游有孔虫和硅藻）的详细分析与大陆代理（热年代学和花粉）进行了比较，揭示了表明构造，气候，构造，构造和构造之间耦合的模式。和海洋动力系统。 EEP盆地（如危地马拉，哥伦比亚和Panamá盆地）沉积速率的明显变化，以及西部山脉的山脉地块的隆升/掘出驱动的降温事件，与安第斯山脉之间地形离散的脉动有关18和10 Ma。由于这些构造事件，降雨强度/分布（增强的地形效应）和排水网络的侵蚀效率发生了显着变化，导致向EEP盆地增加了陆源物质的输入。此外，我们发现〜12 Ma之后海洋生产力的提高与海洋循环的重组和/或大陆生物限制营养素输入的变化有关。从哥伦比亚前陆盆地获得的这一新信息提供了影响中新世期间EEP演变的大陆，海洋和气候因素的复杂信号。

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