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首页> 外文期刊>Facies >Coralgal buildups associated with the Bolca Fossil-Lagerstatten: new evidence from the Ypresian of Monte Postale (NE Italy)
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Coralgal buildups associated with the Bolca Fossil-Lagerstatten: new evidence from the Ypresian of Monte Postale (NE Italy)

机译：与博尔卡化石-拉格斯塔滕有关的珊瑚堆积：来自蒙特普勒伊普尔人的新证据（意大利东北部）

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The Monte Postale and Pesciara di Bolca sites are well-known Eocene Fossil-Lagerstatten. The origin of these deposits has been previously related to a lagoon environment, protected from the open sea by a barrier formed by some kind of reef. However, no detailed description of a bioconstructed system has ever been reported in the area. This study provides the first detailed characterization of the upper Ypresian Monte Postale reef, made of in situ corals, calcareous algae, and encrusting foraminifera. Three main facies associations have been recognized: (1) a coralgal rim, roughly E/W oriented, (2) lagoon deposits in the south and (3) fore-reef sediments towards the north. The coralgal rim is represented by a wave-resistant framework made of heavily calcified organisms associated to Alveolina accumulations; the adaptation of most of these organisms to the euphotic zone promoted their growth in proximity to the sea level, allowing this structure to act as an effective barrier. In particular, during relative sea-level lowstands or highstands, the coralgal rim could have limited the water exchange between the lagoon and the open sea, reducing the oxygenation in the lagoon and allowing the formation of the Fossil-Lagerstatten. During relative sea-level transgressions, the water could have risen well above the margin, establishing normal oxygenation and hampering the fossils' preservation. The Monte Postale succession represents one of the few examples of lower Eocene bioconstructions. The description of this biotic assemblage provides new data for the characterization of reef communities during a crucial climatic phase, near the end of the early Eocene climatic optimum global warming.
机译：Monte Postale和Pesciara di Bolca站点是著名的始新世化石-Lagerstatten。这些沉积物的起源以前与泻湖环境有关，通过某种礁石形成的屏障保护其免受公海侵害。但是，该地区尚未报道过生物构建系统的详细描述。这项研究首次对由上层珊瑚，钙质藻类和包壳有孔虫组成的伊普尔人蒙特邮政珊瑚礁进行了首次详细表征。已经认识到三个主要的相联系：（1）沿E / W方向大致定向的珊瑚边缘，（2）南部的泻湖沉积物，以及（3）北部的前礁沉积物。珊瑚缘的特征是由抗钙化的结构构成，该结构由与肺泡积聚有关的重钙化生物组成。大多数这些生物适应于富营养区，促进了它们在海平面附近的生长，从而使这种结构成为有效的屏障。特别是在相对海平面的低水位或高水位时，珊瑚边缘可能会限制泻湖与公海之间的水交换，从而减少泻湖中的氧合作用并形成化石-拉格斯塔滕。在相对海平面越境期间，水可能会上升到边缘之上，建立正常的氧合作用并妨碍化石的保存。蒙特邮政的演替代表了较低的始新世生物构造的几个例子之一。这种生物组合的描述为关键气候阶段（始新世早期气候最佳全球变暖接近尾声）期间的礁石群落特征提供了新数据。

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