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首页> 外文期刊>Facies >Icehouse, cool-water carbonate ramps: the case of the Upper Pliocene Capodarso Fm (Sicily): role of trace fossils in the reconstruction of growth stages of prograding wedges
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Icehouse, cool-water carbonate ramps: the case of the Upper Pliocene Capodarso Fm (Sicily): role of trace fossils in the reconstruction of growth stages of prograding wedges

机译：冰室，冷水碳酸盐坡道：上新世卡波达尔索Fm（西西里岛）的案例：微量化石在楔体生长阶段重建中的作用

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An integrated approach, based on the use of trace fossils combined with analysis of physical and biogenic structures, identiWcation of key surfaces, and reconstruction of stratigraphic architecture, proved to be of critical value in deWning the depositional environments, elucidating the dynamics of progradation, and characterizing the various systems tracts of Upper Pliocene progradationalwedges (Capodarso area, Sicily) generated by coolwater carbonate ramps. The studied succession consists of a stack of six cycles, consisting of terrigenous mudstones passing upwards into biocalcarenite wedges with distinct clinoforms. The prograding biocalcarenite bodies show seaward- increasing height and steepness of the clinoformed front as a result of development into increasingly deeper water, and may be regarded as the record of distally steepened ramps, dominated by storm-induced downwelling Xows. Evidence of forced-regressive progradation is provided by stratal geometries, physical structures, and trace fossil assemblages existing at the top of the bodies, which attest to a gradual increase in energy level at the top of the ramp, concurrently with the progression of seaward outbuilding of the bodies. Three trace-fossil suites (Thalassinoides/Piscichnus, Scolicia, Dactyloidites) are shown to be linked with the successive growth stages of individual prograding wedges, whereas abandonment stages, characterized by starvation of sediment input, are marked by the Ophiomorpha suite. The Capodarso ramps, like other Plio- Pleistocene equivalents of the Mediterranean area, are small, high-gradient ramps, with stratigraphical architecture controlled by high-amplitude, orbitally driven glacioeustatic changes. An ecologically and bathymetrically based subdivision of the ramps into inner, mid and outer ramp environments is hardly applicable, as most of the wedge progradation occurs in highly dynamic conditions, dominated by physical processes of transport and resedimentation of skeletal material, which result in faunal composition dominated by allochthonous material. The use of trace fossils is of critical value in this context, due to the scarcity of ecological information provided by faunal elements.
机译：结合痕量化石的使用，结合对物理和生物结构的分析，关键面的识别以及地层构造的重建，一种综合方法被证明在确定沉积环境，阐明沉积动力学和提高沉积动力学方面具有至关重要的价值。表征了由冷水碳酸盐坡道产生的上新世上新世的楔形楔（西西里岛卡波达索地区）的各种系统区域。所研究的演替过程由六个周期组成，其中包括陆源泥岩向上进入生物钙钙石楔块，并具有明显的斜斜形。随着向越来越深的水的发展，逐渐发展的生物钙钙石体显示出斜成岩状锋面向海增加的高度和陡度，并且可以看作是由暴雨引起的下沉的Xows主导的向远侧倾斜的斜坡的记录。尸体顶部存在的地层几何结构，物理结构和微量化石组合提供了强迫退化的证据，这证明了坡道顶部的能量水平逐渐增加，同时伴随着向海的附属建筑的发展的身体。显示了三个痕迹化石组（Thalassinoides / Piscichnus，Scolicia，Dactyloidites）与单个渐进楔的连续生长阶段有关，而以phi陷为特征的废弃阶段（以沉积物输入的饥饿为特征）。与地中海地区的其他上新世-上新世等效物一样，卡波达尔索坡道也是小型高梯度坡道，其地层构造受高振幅，轨道驱动的冰川恒河变化控制。将坡道分为内，中，外坡道环境以生态和测深为基础进行划分几乎是不适用的，因为大多数楔形物的生长发生在高度动态的条件下，主要是骨骼物质的运输和再沉积的物理过程，从而导致动物的组成以异质材料为主。由于缺乏动物元素提供的生态信息，在这种情况下使用痕迹化石具有至关重要的价值。

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