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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Altered carbon cycling and coupled changes in Early Cretaceous weathering patterns: Evidence from integrated carbon isotope and sandstone records of the western Tethys
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Altered carbon cycling and coupled changes in Early Cretaceous weathering patterns: Evidence from integrated carbon isotope and sandstone records of the western Tethys

机译：碳循环的改变和早白垩纪风化模式的耦合变化：来自特提斯西部的整合碳同位素和砂岩记录的证据

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摘要

In this study we investigate if a major perturbation of the Early Cretaceous carbon cycle was accompanied by altered weathering and erosion rates. The large Aptian carbon isotope anomaly records the response of the biosphere to widespread volcanic activity and probably resulting changes in atmospheric pCO_2 levels. Elevated pCO_2 levels should also result in an accelerated hydrological cycle and increased silicate weathering, creating a negative feedback loop removing CO_2 from the atmosphere. We propose to interpret the widespread occurrence of quartz sandstones in the Tethys–Atlantic seaway as a result of altered weathering and erosion rates in the wake of the Aptian carbon cycle excursion. We challenge the traditional notion that these are 'flysch' deposits associated with Early Cretaceous orogenic movements in the western Tethys. We propose that these sandstones were most likely part of a large conveyor belt system, acting along the Iberian and European margin of the Tethys seaway. Using chemostratigraphic correlations, we show that the activity of this system was only short-lived and coeval with changes in coastal ecology and the Aptian carbon cycle perturbations. We tentatively relate the existence of this system to a transient climate regime, characterized by fluctuating pCO_2 levels.
机译：在这项研究中，我们调查了早白垩世碳循环的主要扰动是否伴有风化和侵蚀速率的变化。大的Aptian碳同位素异常记录了生物圈对广泛的火山活动的响应，并可能导致了大气pCO_2水平的变化。较高的pCO_2水平也应导致加速的水文循环和增加的硅酸盐风化作用，从而形成一个负反馈回路，将CO_2从大气中清除。我们建议解释在阿提安碳循环偏移之后，风化和侵蚀速率的变化导致特提斯-大西洋海道石英砂岩的广泛发生。我们质疑传统观念，即这些是与特提斯西部早白垩世造山运动有关的“飞石”矿床。我们认为，这些砂岩很可能是大型输送带系统的一部分，沿特提斯海道的伊比利亚和欧洲边界活动。使用化学地层学相关性，我们表明该系统的活动只是短暂的，并且与沿海生态系统的变化和Aptian碳循环扰动同时发生。我们暂时将该系统的存在与以pCO_2水平波动为特征的瞬时气候状态联系起来。

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