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首页> 外文期刊>Facies >The bioeroded megasurface of Oura (Algarve, south Portugal): implications for the Neogene stratigraphy and tectonic evolution of southwest Iberia
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The bioeroded megasurface of Oura (Algarve, south Portugal): implications for the Neogene stratigraphy and tectonic evolution of southwest Iberia

机译：欧拉（葡萄牙南部阿尔加维）遭受生物侵蚀的巨型表面：对西南伊比利亚新近纪地层和构造演化的影响

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摘要

The use of rocky palaeoshore bioerosion analy_sis as a tool to solve stratigraphic and tectonic issues is beginning to bear fruits. The occurrence of an extensive intra-Miocene marine abrasion platform in southern Portu_gal at Oura (Albufeira) has been identified on the basis of bioerosion trace fossils analysis. The observed ichnodiver_sity is rather low, with bivalve boring Gastrochaenolites being dominant. Nevertheless, the ichnoassemblage may be assigned to the Entobia ichnofacies. The palaeoichnologi_cal study of the Oura hardground confirmed the existence of an important intra-Miocene stratigraphic gap (ca. 3 Ma hiatus), represented by a razor-sharp erosional contact that separates the two main Neogene units in the Algarvian region: the lower carbonate sequence of Lagos_Portim_o Formation (Langhian/Serravallian) and the upper siliciclastic sequence of the Cacela Formation (Upper Tortonian).
机译：岩石古海岸生物侵蚀分析作为解决地层和构造问题的工具的使用已开始见效。根据生物侵蚀痕迹化石分析，已经确定在奥拉（阿尔布费拉）南部Portu_gal南部发生了广泛的中新世海洋磨损平台。观察到的鱼鳞鱼相当低，其中以双壳类无聊的胃肠生物为主导。尽管如此，鱼鳞组合可能被分配给了恩托比亚鱼鳞相。欧拉硬地层的古生物学研究证实存在重要的中新世内部地层间隙（约3 Ma裂隙），其特征是刀锋般锋利的侵蚀接触将阿尔加维地区的两个主要新近生单元分开：较低的碳酸盐岩层序Lagos_Portim_o组（Langhian / Serravallian）的构造和Cacela组的上部硅质碎屑序列（上部Tortonian）。

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