气候变化领域集成服务门户(CCPortal): The Morro Vermelho hypogenic karst system (Brazil): Stratigraphy; fractures; and flow in a carbonate strike-slip fault zone with implications for carbonate reservoirs

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DOI	10.1306/05212019150
	The Morro Vermelho hypogenic karst system (Brazil): Stratigraphy; fractures; and flow in a carbonate strike-slip fault zone with implications for carbonate reservoirs
	Bertotti G.; Audra P.; Auler A.; Bezerra F.H.; de Hoop S.; Pontes C.; Prabhakaran R.; Lima R.
发表日期	2020
ISSN	0149-1423
起始页码	2029
结束页码	2050
卷号	104 期号:10
英文摘要	The Morro Vermelho Cave (MVC) (Brazil) developed within the Morro Vermelho karst system, which affected Neoproterozoic limestones (Salitre Formation). The MVC experienced little interactions with meteoric processes and is an example of a hypogenic cave formed during strike-slip deformation. The Salitre carbonates in the MVC experienced distributed deformation along an elongated domain overlying a buried strike-slip fault. Gently dipping, semiductile shear zones formed with decimeter-scale (3.9 in.) dolomitic veins. In our model, Mg-rich fluids flowing along the Salitre aquifer caused at the same time extensive dolomitization of the body of rock (100-m [328-ft] scale) experiencing distributed deformation. With progressive displacement, the deep strike-slip fault propagated upward causing the development of an anticline pop-up, steepening sedimentary layers, and steep 1-10-m-long (3.3-33.8-ft) fractures, which served as pathways for upward fluid flow. These steep extensional fractures made it possible for fluids flowing in lower, quartzitic aquifers to enter the carbonate aquifer causing silica deposition in rock cavities and in fractures and fault planes. Following the main stage of speleogenesis, silica deposition took over again depositing on the cave walls a continuous silica crust, rarely observed in other settings worldwide. The interplay between regional bedding-parallel flow and focused circulation of fluids along steep faults and dipping layers, and the associated rock-fluid interactions are not unique to the contractional settings presented but can also occur in association with similar faults in rifted continental margins. Copyright © 2020. The American Association of Petroleum Geologists. All rights reserved.
英文关键词	Aquifers; Association reactions; Carbonation; Caves; Deformation; Deposition; Fracture; Hydrogeology; Lime; Parallel flow; Silica; Stratigraphy; Strike-slip faults; Structural geology; Carbonate reservoir; Distributed deformation; Fluid interactions; Fractures and faults; Progressive displacement; Rifted continental margin; Sedimentary layers; Strike-slip deformation; Fault slips; anticline; aquifer; carbonate; continental margin; dolomitization; fault zone; fracture; karst; stratigraphy; strike-slip fault; Brazil
语种	英语
来源期刊	AAPG Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/168686
作者单位	Department of Geoscience and Engineering, Delft University of Technology (TU Delft), Delft, Netherlands; Polytech Lab Unité Propre de Recherches 7498, University of Nice Sophia Antipolis, Nice, France; Instituto do Carste, Carste Ciência e Meio Ambiente, Belo Horizonte, Minas Gerais, Brazil; Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil; Department of Geoscience and Engineering, Delft University of Technology, Delft, Netherlands
推荐引用方式 GB/T 7714	Bertotti G.,Audra P.,Auler A.,et al. The Morro Vermelho hypogenic karst system (Brazil): Stratigraphy; fractures; and flow in a carbonate strike-slip fault zone with implications for carbonate reservoirs[J],2020,104(10).
APA	Bertotti G..,Audra P..,Auler A..,Bezerra F.H..,de Hoop S..,...&Lima R..(2020).The Morro Vermelho hypogenic karst system (Brazil): Stratigraphy; fractures; and flow in a carbonate strike-slip fault zone with implications for carbonate reservoirs.AAPG Bulletin,104(10).
MLA	Bertotti G.,et al."The Morro Vermelho hypogenic karst system (Brazil): Stratigraphy; fractures; and flow in a carbonate strike-slip fault zone with implications for carbonate reservoirs".AAPG Bulletin 104.10(2020).