Facies variability in mixed carbonate–siliciclastic platform slopes (Miocene)

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• 作者：Jesús Reolid ; Christian Betzler ; Victoria Singler ; Christiane Stange…
• 关键词：Build ; ups ; Serpulids ; Facies belts ; Facies mosaics ; Encrusters ; Reef
• 刊名：Facies
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：63
• 期：2
• 全文大小：
• 刊物类别：Earth and Environmental Science
• 刊物主题：Sedimentology; Biogeosciences; Geochemistry; Paleontology; Ecology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1612-4820
• 卷排序：63

文摘

Miocene tropical carbonate platform slopes in southern Spain contain classical reef-slope facies distribution but also an unexpected abundance of serpulid-rich facies, locally forming build-ups. Two sections from the Miocene Sorbas and Níjar Basins were mapped and analyzed petrographically in order to identify the factors determining this facies variability. Reef-slope facies is intercalated with serpulid-rich facies and siliciclastic bodies. Serpulids are the pioneers colonizing the substrate in zones of quiet hydrodynamic conditions after hydrographical changes such as eventual river discharge. The interplay of sea-level changes and hydrographical conditions, together with episodic terrestrial influx, control lateral and along-slope facies variability as well as the facies distribution across the carbonate platform. Neither a deterministic distribution of facies belts nor a stochastic partitioning of facies in mosaics can accurately explain the facies distribution. A new model is proposed to explain facies variability in the context of intrinsic and extrinsic factors.