Characteristics, genesis and parameters controlling the development of a large stratabound HTD body at Matienzo (Ramales Platform, Basque–Cantabrian Basin, northern Spain)

Dewit, Julie; Foubert, Anneleen; Desouky, Hamdy El; Muchez, Philippe; Hunt, Dave; Vanhaecke, Frank; Swennen, Rudy

doi:10.1016/j.marpetgeo.2013.12.021

Cited by 32 publications

(25 citation statements)

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“…At the large scale, these high temperature peaks are presumably associated with the presence of a pluton below the Iberian Chain that formed in relation to the opening of the North Atlantic (Salas et al 2005). Moreover, these high temperature peaks are time-equivalent to those that resulted in the dolomitization of the Basque Cantabrian Basin (López-Horgue et al 2010;Shah et al 2010;Swennen et al 2012;Dewit et al 2014), and thus are presumably associated with the same large scale geodynamic event.…”

Section: Regional High-temperature Eventmentioning

confidence: 84%

Activation of stylolites as conduits for overpressured fluid flow in dolomitized platform carbonates

Martín‐Martín

Gomez‐Rivas

Gómez‐Gras

et al. 2017

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Section: Regional High-temperature Eventmentioning

confidence: 84%

Activation of stylolites as conduits for overpressured fluid flow in dolomitized platform carbonates

Martín‐Martín

Gomez‐Rivas

Gómez‐Gras

et al. 2017

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“…The dolomitisation patterns presented in section 3.4 resemble those from a number of different outcrops, including the Zagros Mountains in Iran, the Canadian Rocky Mountains, and the Basque-Cantabrian Basin in the North of Spain, where dolomite geochemistry indicates formation from high temperature fluids (Sharp et al, 2010;Lopez-Horgue et al, 2010;Dewit et al, 2014). Although a detailed stratigraphic description of the dolomitised outcrops above Lake O'Hare in the Canadian Rocky Mountains ( fig.…”

Section: Fault-controlled Dolomitisation and Htd Geobodiesmentioning

confidence: 88%

“…These models all produce dolomite bodies with geometries comparable to those of hydrothermal dolomite bodies observed at several outcrops (Corbella et al, 2014;Sharp et al, 2010;Lopez-Horgue et al, 2010;Dewit et al, 2014). Four models are presented, which provide insight into the influence of fault geometry and permeability of fault zone and of boundary conditions on the patterns of hydrothermal dolomitisation.…”

Section: Modelling Hydrothermal Dolomitisation In a Fault Settingmentioning

confidence: 90%

“…HTD bodies can have a patchy and localised distribution around sub-seismic scale faults (Machel, 2004;Wilson et al, 2007;Lopez-Horgue et al, 2010), but can also occur as stratabound bodies extending laterally for several tens of kilometres away from the faults proposed to have sourced the hydrothermal fluids (Davies and Smith, 2006;Corbella et al, 2014;Dewit et al, 2014). Important uncertainties remain as to the controls on the nature of hydrothermal alteration and the extent to which this process can form laterally extensive dolomites.…”

Section: Introductionmentioning

confidence: 99%

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Reactive transport modelling of hydrothermal dolomitisation using the CSMP++GEM coupled code: Effects of temperature and geological heterogeneity

et al. 2017

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University of Bristol -Explore Bristol Research General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms Reactive transport modelling of hydrothermal dolomitisation using the CSMP++GEM coupled code:Effects of temperature and geological heterogeneity AbstractReactive transport simulations using our CSMP++GEM coupled code were applied to study the major controls on replacement dolomitisation and the development of dolomite geobodies in a hydrothermal setting. A series of 2D simulations show how elevated temperature and reactive surface area increase the rate of dolomitisation, and result in a dolomite replacement front that is both sharper and inclined at a higher angle from vertical. This inclination, an effect of gravity segregation, is apparent in thick homogeneous units, but in layered systems the lithological contrast determines the shape of the dolomite front. The increase in permeability resulting from porosity generation upon replacement of calcite by dolomite has a major effect on accelerating the overall progress of dolomitisation. In contrast, the changes in fluid density due to chemical reactions and the pressure dependence of thermodynamic data have a minor influence under simulated conditions. Primary dolomite forms slowly after complete replacement of host calcite, leading to porosity decrease, and is only locally important around the source of the hydrothermal fluid.For a simple layered system, our model results are in excellent agreement * Corresponding author. Present address: ETH Zurich, Institute of Geochemistry and Petrology. E-mail address: alina.yapparova@gmail.comPreprint submitted to Chemical Geology July 6, 2017with those obtained using TOUGHREACT code. They do, however, show the advantage of unstructured triangular over structured rectangular meshes for resolving complex curved/inclined front shapes. Such meshes also offer benefits in simulating fault-controlled hydrothermal dolomitisation. Our simulations predict dolomite geobodies comparable in scale and morphology to natural examples documented at outcrops, and underline the importance of understanding the permeability structure within and around the fault zone.

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“…In contrast, Hayman [] described how the introduction of aqueous species by infiltration of shallow meteoric fluids caused mineralogical changes along a western U.S. extensional detachment. In the Albian carbonate rocks from the Cantabrian basin, northern Spain, a strong signature of fluids enriched in Pb‐Zn‐Fe is described [ López‐Horgue et al ., ; Dewit et al ., ]. These hydrothermal systems occurred over hyperextended crust within a domain where magmatic rocks are found.…”

Section: Introductionmentioning

confidence: 99%

Tracing mantle‐reacted fluids in magma‐poor rifted margins: The example of Alpine Tethyan rifted margins

Pinto

Manatschal

Karpoff

et al. 2015

Geochem Geophys Geosyst

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The thinning of the crust and the exhumation of subcontinental mantle in magma‐poor rifted margins is accompanied by a series of extensional detachment faults. We show that exhumation along these detachments is intimately related to migration of fluids leading to changes in mineralogy and chemistry of the mantle, crustal, and sedimentary rocks. Using field observation and analytical methods, we investigate the role of fluids in the fossil distal margins of the Alpine Tethys. Using Cr‐Ni‐V, Fe, and Mn as tracers, we show that fluids used detachment faults as pathways and interacted with the overlying crust and sediments. These observations allow us to discuss when, where, and how this interaction happened during the formation of the rifted margin. The results show that: (i) serpentinization of mantle rocks during their exhumation results in the depletion of elements and migration of mantle‐reacted fluids that are channeled along active detachment system; (ii) in earlier‐stages, these fluids affected the overlying syntectonic sediments by direct migration from the underlying detachments;(iii) in later‐stages, these fluids arrived at the seafloor, were introduced into, or “polluted” the seawater and were absorbed by post tectonic sediments. We conclude that a significant amount of serpentinization occurred underneath the hyperextended continental crust, and that the mantle‐reacted fluids might have modified the chemical composition of the sediments and seawater. We propose that the chemical signature of serpentinization related to mantle exhumation is recorded in the sediments and may serve as a proxy to date serpentinization and mantle exhumation at present‐day magma‐poor rifted margins.

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Characteristics, genesis and parameters controlling the development of a large stratabound HTD body at Matienzo (Ramales Platform, Basque–Cantabrian Basin, northern Spain)

Cited by 32 publications

References 50 publications

Activation of stylolites as conduits for overpressured fluid flow in dolomitized platform carbonates

Activation of stylolites as conduits for overpressured fluid flow in dolomitized platform carbonates

Reactive transport modelling of hydrothermal dolomitisation using the CSMP++GEM coupled code: Effects of temperature and geological heterogeneity

Tracing mantle‐reacted fluids in magma‐poor rifted margins: The example of Alpine Tethyan rifted margins

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