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首页> 外文期刊>Paleoceanography >Cool episode and platform demise in the Early Aptian: New insights on the links between climate and carbonate production
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Cool episode and platform demise in the Early Aptian: New insights on the links between climate and carbonate production

机译：Aptian早期的凉爽事件和平台消亡：关于气候与碳酸盐生产之间联系的新见解

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The Early Aptian encountered several crises in neritic and pelagic carbonate production, major perturbations in the carbon cycle, and an oceanic anoxic event (OAE1a). Yet the causal links between these perturbations and climate changes remain poorly understood, partly because temperature records spanning the Early Aptian interval are still scant. We present new O-18 data from well-preserved bivalves from a carbonate platform of the Galve subbasin (Spain) that document a major cooling event postdating most of OAE1a. Our data show that cooling postdates the global platform demise and cannot have triggered this event that occurred during the warmest interval. The warmest temperatures coincide with the time equivalent of OAE1a and with platform biotic assemblages dominated by microbialites at Aliaga as well as on other Tethyan platforms. Coral-dominated assemblages then replace microbialites during the subsequent cooling. Nannoconids are absent during most of the time equivalent of the OAE1a, probably related to the well-known crisis affecting this group. Yet they present a transient recovery in the upper part of this interval with an increase in both size and abundance during the cool interval portion that postdates OAE1a. An evolution toward cooler and drier climatic conditions may have induced the regional change from microbial to coral assemblages as well as nannoconids size and abundance increase by limiting continent-derived input of nutrients.
机译：早阿普特人曾遇到过以下事件：碳酸盐岩和中层碳酸盐岩的生产，碳循环的主要扰动和海洋缺氧事件（OAE1a）。然而，人们对这些扰动与气候变化之间的因果关系仍然知之甚少，部分原因是跨Apttian早期间隔的温度记录仍然很少。我们提供了来自Galve盆地（西班牙）碳酸盐岩平台保存完好的双壳类动物的最新O-18数据，这些数据记录了大部分OAE1a之后发生的一次重大降温事件。我们的数据表明，冷却要推迟到全球平台消亡，并且不能触发在最暖间隔期间发生的此事件。最温暖的温度与OAE1a的时间相当，并且与Aliaga以及其他Tethyan平台上的以微辉石为主体的平台生物组合一致。然后，在随后的冷却过程中，以珊瑚为主的组件将替代微辉石。在大多数时间里，与农杆菌素A1a相当的时间内，纳米醇没有出现，这可能与影响这一群体的众所周知的危机有关。然而，在OAE1a之后的凉爽间隔部分，它们在该间隔的上部呈现出短暂的恢复，并且在大小和丰度上都有所增加。朝着凉爽和干燥的气候条件的演变可能已经导致了从微生物到珊瑚的区域变化，以及通过限制来自大陆的养分输入而使纳米锥虫的大小和丰度增加。

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