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首页> 外文期刊>Facies >New paleoenvironmental insights on the Miocene condensed phosphatic layer of Salento (southern Italy) unlocked by the coral-mollusc fossil archive
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New paleoenvironmental insights on the Miocene condensed phosphatic layer of Salento (southern Italy) unlocked by the coral-mollusc fossil archive

机译：关于珊瑚 - 软体动物化石档案索伦托（意大利南部）解锁的新环境洞察

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摘要

From the Late Oligocene to the Late Miocene, the central Mediterranean area was characterized by the extensive deposition of phosphate-rich sediments. They are usually represented by 10 to 20-cm-thick hardgrounds made of phosphatic and glauconitic sediments containing a rich macrofossil association. This study represents the first thorough investigation of the biotic assemblage of Mediterranean phosphorites aimed at collecting new information on the environmental factors controlling their deposition. The Serravallian/Tortonian phosphatic deposits of the Salento Peninsula ("Aturia level") have been selected for the abundance of fossil remains and special attention is given to the coral-mollusc association. Two different facies have been recognized: a basal coral rudstone that includes most of the macrofossils, superimposed by a detrital rudstone made of thin layers mainly composed of phosphatic fragments. These two facies are separated by a phosphatic crust several millimeters in thickness. The coral assemblage contains at least 17 azooxanthellate taxa belonging to four families, while the molluscs are represented by a rich gastropod fauna (26 species), associated with bivalves (18 species) and cephalopods (two species). Four distinct depositional phases have been recognized, with the coral rudstone representing the key-facies to reconstruct the onset of the "Aturia level" and the original environment of its fossil content. The composition of the coral-mollusc association has been reliably compared with present-day analog taxa, suggesting the occurrence of a heterogeneous seafloor formed by rocky substrates and accumulations of soft sediment, at around 100-350-m water depth, and under the influence of moderate-to-strong bottom currents rich in nutrients and resuspended organic matter.
机译：从晚期的少茂到后期内科，中央地中海地区的特点是富含磷酸盐的沉积物的广泛沉积。它们通常由10至20厘米厚的硬盘代表，由含有富含富含大甲溶液结合的磷酸化和青光素沉积物制成。本研究代表了旨在收集控制其沉积的环境因素的新信息的地中海磷矿生物组合的第一次彻底调查。 Salento半岛（“Aturia水平”）的Serravallian / Tortonian磷酸盐沉积物已被选中为丰富的化石遗骸，特别注意珊瑚菌体协会。已经认识到两个不同的相：基础珊瑚鲁石包括大多数宏型，由主要由磷酸碎片组成的薄层制成的脱脂葡萄牙叠加。这两个相用几毫米的磷酸壳分开。珊瑚组合包含至少17个属于四个家庭的AzoOxanthellate分类群，而软体动物由富含胃肠道（26种）表示，与双抗体（18种）和头孢粒（两种）相关联。已经认识到四个不同的沉积阶段，珊瑚鲁石代表关键相形的关键相，以重建“Aturia水平”的开始和其化石内容的​​原始环境。与本日模拟分类群相比，珊瑚-Mollusc关联的组成已被可靠地进行比较，表明由岩石基板和软沉积物的积聚，在约100-350米的水深，并且在影响下中等至强的底部电流富含营养物质，重新悬浮有机物。

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