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首页> 外文期刊>Facies >Palaeoenvironmental reconstruction based on non-geniculate coralline red algal assemblages in Miocene limestone of central Crete
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Palaeoenvironmental reconstruction based on non-geniculate coralline red algal assemblages in Miocene limestone of central Crete

机译：基于克里特中部中新世石灰岩中非成象珊瑚红藻组合的古环境重建

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Neogene coastal sediments of the Mediterranean provide an excellent laboratory for a quantitative study of palaeoenvironmental parameters and their response to climate change. In order to examine change in environmental parameters during deposition of Tortonian limestone of southern central Crete, we use integrated field and biofacies analysis together with a detailed study of foraminfera and non-geniculate red algae. Patterns in the relative abundance of non-geniculate coralline red algae are interpreted by comparison with data from modern non-geniculate coralline red algae and with additional information from the studied sediments. Based on these integrated datasets, four red algal associations are identified: a Lithophyllum-dominated association restricted to the upper photic zone in warm-temperate environments, a Lithothamnion-dominated association found in the lower photic zone in warm-temperate environments, a Spongites-dominated association typical for shallow warm-temperate to tropical environments and an association with dominant Mesophyllum which is characteristic for the lower photic zone in warm-temperate to tropical environments. We introduce coralline red algal indices in order to quantify changes in environmental parameters. We recognise four warm intervals within a succession of the Tortonian limestones in southern central Crete. During the most extensive interval, widespread coral carpets formed under prevalent oligotrophic conditions. Analysis of the stratigraphic architecture shows that warm intervals are related to sea-level highstands and therefore may reflect global climatic processes.
机译：地中海的新近纪沿海沉积物为定量研究古环境参数及其对气候变化的响应提供了极好的实验室。为了检查克里特岛南部中部的Tortonian石灰岩沉积过程中环境参数的变化，我们使用了综合的场相和生物相分析以及对有孔虫和非成年红藻的详细研究。通过与现代非单生珊瑚红藻的数据以及研究沉积物的附加信息进行比较，可以解释非单生珊瑚红藻相对丰度的模式。根据这些综合数据集，确定了四个红色藻类协会：在温带环境中仅限于上光层带的石藻占主导的协会，在温带环境中在较低光层区的石蜡亚目占主导的协会，海绵体-在浅温带至热带环境中通常占主导的联系，而在温带至热带环境中较低的光合带所特有的与优势叶肉纲的联系。我们引入珊瑚红藻指数以量化环境参数的变化。我们在克里特岛中南部的一系列Tortonian石灰岩中识别出四个暖期。在最广泛的时间间隔内，在普遍的贫营养条件下形成了广泛的珊瑚地毯。对地层结构的分析表明，暖期与海平面高位有关，因此可能反映了全球气候过程。

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