Reef slope geometries and facies distribution: controlling factors (Messinian, SE Spain)
Reef slope geometries and facies distribution: controlling factors (Messinian, SE Spain)
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礁坡几何形状和相分布：控制因素（西班牙东南部梅西尼安）
DOI：
10.1007/s10347-014-0406-4
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发表时间：
2014
期刊：
影响因子：
1.8
通讯作者：
Reijmer
中科院分区：
文献类型：
--
作者：
Reolid;Betzler;Martín;Lindhorst;Reijmer
海平面波动和沉积物粒度的变化被广泛认为是控制碳酸盐台地斜坡几何形状的主要因素。从上中新统Cariatiz碳酸盐台地（西班牙东南部）连续两个斜坡体被选中，分析几何形状和相分布与海平面振荡。这些斜坡状体中自上而下出现的相有礁架、礁架碎屑、Halimeda角砾岩、Halimeda rudstone和生物碎屑岩，以及粉砂岩和泥灰岩。斜坡的几何形状和相、组成和分布在各个斜坡体中有显著的不同。这些差异是珊瑚生长、原地斜坡碳酸盐生成、岩崩和沉积物重力流、半深海雨、礁坡相改造和硅质沉积物输入等若干因素相互作用的结果。可容纳空间的变化与海平面波动有关，并控制着这些因素的相对影响。海平面下降发生在选定的斜坡体沉积之间的时间，改变了盆地的水文条件。这些变化影响了Halimeda的存在和粒度分布，从而影响了斜坡的几何形状。礁坡的几何形状并不完全受粒度变化的控制。有机结合稳定作用是控制坡面沉积的重要因素。
Sea-level fluctuations and changes in sediment grain size are widely thought to be the main factors controlling carbonate platform slope geometries. Two successive clinoform bodies from the Upper Miocene Cariatiz carbonate platform (SE Spain) were selected to analyze geometry and facies distribution in relation to sea-level oscillations. Facies occurring in these clinoform bodies are from top to bottom reef-framework, reef-framework debris, Halimeda breccia, Halimeda rudstone, and bioclastic packstone, as well as siltstone and marl. Slope geometry and facies, composition, and distribution, are significantly different in each clinoform body. These differences are the result of the interaction of several factors such as coral growth, in situ slope carbonate production, rockfalls and sediment gravity flows, hemipelagic rain, reworking of reef-slope facies and siliciclastic input. Changes in accommodation were related to sea-level fluctuations and controlled the relative impact of these factors. A sea-level fall took place in the time between deposition of the selected clinoform bodies and changed the hydrographical conditions of the basin. These changes influenced the presence of Halimeda and the grain-size distribution, and consequently the slope geometries. Reef-slope geometry is not exclusively controlled by changes in grain size. The stabilization by organic binding is proposed to be a significant factor controlling the slope deposition.