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首页> 外文期刊>Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geo-Sciences >Charophyte palaeoecology in the Upper Eocene of the Eastern Ebro basin (Catalonia, Spain). Biostratigraphic implications
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Charophyte palaeoecology in the Upper Eocene of the Eastern Ebro basin (Catalonia, Spain). Biostratigraphic implications

机译：埃布罗东部盆地（西班牙加泰罗尼亚）上新世上的风化石古生态。生物地层学意义

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摘要

A micropalaeontological study of the non-marine Upper Eocene of the north eastern Ebro Basin (Catalonia, Spain) was carried out to clarify the palaeoecology of well-known charophyte species that are widely recognised as significant in charophyte biostratigraphy. Autochthonous specimens of the biozone index-species Harrisichara vasiformis-tuberculata were found in marlstones from the Sant Boi Formation (middle part of the Priabonian), which are associated with brackish water ponds laterally related to paralic marshes. In contrast, laterally equivalent assemblages found in white laminated marls from stable freshwater lakes were devoid of the index species and were dominated by Harrisichara lineata. Three more charophyte assemblages are reported from the continental Artés Formation (Stephanochara vectensis biozone, Upper Priabonian). Assemblages dominated by the species Nodosochara jorbae, reported only from Iberia at that age, occur in marlstones related to freshwater, temporary and turbid lakes within flood plains in medial fluvial fan environments. However, Lychnothamnus grambastii dominates locally in similar environments with higher organic matter content. Laterally equivalent assemblages from freshwater perennial lakes in distal alluvial fan facies were dominated by the biozone index-species Harrisichara tuberculata.These results provide evidence that important charophyte index species of the European charophyte biozonation were controlled by palaeoenvironmental factors such as water salinity, lake level changes or terrigenous input to the lakes. In consequence, these species should be used with caution in biostratigraphic studies, taking into account that their presence or absence may be palaeoecologically driven.
机译：对东北埃布罗盆地（西班牙加泰罗尼亚）的非海洋上新世进行了微古生物学研究，以阐明众所周知的叶藻物种的古生态，这些物种在叶藻生物地层学中被广泛认为是重要的。在桑特博伊岩层（Priabonian中部）的泥灰岩中发现了生物区指数物种哈里希氏原种（Harrisichara vasiformis-tuberculata）的土生标本，这些泥岩与侧向与寄生沼泽相关的微咸水塘有关。相反，在稳定的淡水湖泊的白色层压泥灰岩中发现的侧向等效组合没有该指数物种，并且以哈里斯哈拉系为主导。据报道，来自大陆Artés地层（Stephanochara vectensis生物区，上Priabonian）的三个风化石组合。仅在那个年龄从伊比利亚报告过的由Nodosochara jorbae物种主导的集合体出现在与河流相连的扇形环境中的泛滥平原内的淡水，临时和浑浊湖泊相关的泥石中。然而，在相似的环境中，Lychnothamnus grambastii在本地具有较高的有机质含量。生物区指数物种哈里斯哈勒结核（Harrisharahara tuberculata）主导了淡水多年生扇形相中多年生湖泊的横向等价组合，这些结果提供了证据证明欧洲风化生物带化的重要风化生物指标物种受古环境环境因素控制，例如水盐度，湖泊水位变化等或湖泊的陆源输入。因此，考虑到它们的存在与否可能是古生态驱动的，因此在生物地层学研究中应谨慎使用这些物种。

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