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首页> 外文期刊>Facies >Onset of temperate carbonate sedimentation during transgression in a low-energy siliciclastic embayment (Pliocene of the Val d’Orcia Basin, Tuscany, Italy)
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Onset of temperate carbonate sedimentation during transgression in a low-energy siliciclastic embayment (Pliocene of the Val d’Orcia Basin, Tuscany, Italy)

机译：低能硅质碎屑海侵（意大利托斯卡纳Val d'Orcia盆地上新世）海侵过程中温带碳酸盐沉积的开始

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摘要

A Mid-Pliocene sequence in the sedimentary fill of the Val d’Orcia Basin (Tuscany, Italy) records coeval accumulation of temperate carbonate and siliciclastic deposits in close proximity. This study investigates the role played by local parameters in influencing the spatially discontinuous onset of carbonate sedimentation. Carbonate facies developed during transgression of an irregular coastline and were restricted to the more enclosed portion of an embayment. Coralline red algae were the main carbonate producers and are preserved in the skeletal association as isolated branches, rhodoliths, and incipient bindstone. When comparing the sedimentological attributes of the siliciclastic- and carbonate-dominated deposits, no significant differences are observed. They both appear to have accumulated in shallow-marine areas, subjected to general low-energy conditions punctuated by sporadic higher-energy events. Nevertheless, coastal morphology and bedrock composition at the basin margin created local heterogeneities that were sufficient to induce restricted spatial distribution of the carbonate-producing factory.
机译：Val d'Orcia盆地（意大利托斯卡纳）沉积填充物中的上新世序列记录了近距离温带碳酸盐岩和硅质碎屑沉积物的同时期堆积。这项研究调查了局部参数在影响碳酸盐沉积在空间上不连续的爆发中的作用。碳酸盐岩相在不规则海岸线越过期间形成，并被限制在航道的较封闭部分。珊瑚红藻是主要的碳酸盐生产地，并以孤立的分支，杜鹃石和初期粘结石的形式保存在骨骼组织中。当比较硅质碎屑岩和碳酸盐岩为主的沉积物的沉积学特征时，没有发现显着差异。它们似乎都聚集在浅海地区，受到散发性高能事件所打断的一般低能条件的影响。然而，盆地边缘的海岸形态和基岩成分造成了局部异质性，足以引起碳酸盐生产工厂空间分布的局限。

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