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

J. D. Martín-Martín, E. Gomez Rivas, D. Gómez-Gras, A. Travé, R. Ameneiro, D. Koehn, P.D. Bons

Research output: Contribution to journalArticle

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Abstract

This study investigates the late Aptian-early Albian platform carbonates of the Benicàssim area (Maestrat Basin, Spain) in order to assess the relationship between bed-parallel stylolites and the flow of diagenetic fluids during dolomitization and late hydrothermal alteration. Dolomite and burial dolomite and calcite cements were studied by a combination of field geology and standard petrographic and isotope analysis. The results indicate that dolostones are closely associated with seismic-scale synsedimentary faults. Dolostones preferentially replace grain-dominated facies and typically show wavy dolomitizing fronts that mostly correspond to bed-parallel stylolites. The dolostones are corroded and contain bed-parallel pores that are filled with hydrothermal saddle dolomite and late blocky calcite cements. This calcite cement frequently engulfs clasts of the host dolomite suggesting that hydraulic brecciation likely associated with overpressured fluid occurred. Results indicate that stylolites play a key role in the distribution of dolostones and subsequent hydrothermal mineralization. During the replacement stage, stylolites acted as baffles for the dolomitzing fluids controlling lateral fluid flow and resulting in the stratabound dolostone distribution. During the post-dolomitization stage, stylolites became preferred pathways for overpressured hydrothermal corrosive and mineralizing fluids that likely came from the underlying basement, and increased bed-parallel stylolitic porosity and probably permeability as well
Original languageEnglish
Pages (from-to)157-176
Number of pages20
JournalGeological Society Special Publications
Volume459
Early online date3 May 2017
DOIs
Publication statusPublished - 2018

Fingerprint

dolostone
Calcite
carbonate platform
fluid flow
Flow of fluids
Carbonates
Cements
Chemical activation
dolomite
Fluids
cement
calcite
fluid
dolomitization
Geology
Isotopes
Porosity
Hydraulics
Aptian
hydrothermal alteration

Keywords

  • dolomitization
  • hydrothermal cementation
  • stylolites
  • fault
  • overpressured fluid

Cite this

Activation of stylolites as conduits for overpressured fluid flow in dolomitized platform carbonates. / Martín-Martín, J. D.; Gomez Rivas, E.; Gómez-Gras, D.; Travé, A.; Ameneiro, R.; Koehn, D.; Bons, P.D.

In: Geological Society Special Publications , Vol. 459, 2018, p. 157-176.

Research output: Contribution to journalArticle

Martín-Martín, J. D. ; Gomez Rivas, E. ; Gómez-Gras, D. ; Travé, A. ; Ameneiro, R. ; Koehn, D. ; Bons, P.D. / Activation of stylolites as conduits for overpressured fluid flow in dolomitized platform carbonates. In: Geological Society Special Publications . 2018 ; Vol. 459. pp. 157-176.
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title = "Activation of stylolites as conduits for overpressured fluid flow in dolomitized platform carbonates",
abstract = "This study investigates the late Aptian-early Albian platform carbonates of the Benic{\`a}ssim area (Maestrat Basin, Spain) in order to assess the relationship between bed-parallel stylolites and the flow of diagenetic fluids during dolomitization and late hydrothermal alteration. Dolomite and burial dolomite and calcite cements were studied by a combination of field geology and standard petrographic and isotope analysis. The results indicate that dolostones are closely associated with seismic-scale synsedimentary faults. Dolostones preferentially replace grain-dominated facies and typically show wavy dolomitizing fronts that mostly correspond to bed-parallel stylolites. The dolostones are corroded and contain bed-parallel pores that are filled with hydrothermal saddle dolomite and late blocky calcite cements. This calcite cement frequently engulfs clasts of the host dolomite suggesting that hydraulic brecciation likely associated with overpressured fluid occurred. Results indicate that stylolites play a key role in the distribution of dolostones and subsequent hydrothermal mineralization. During the replacement stage, stylolites acted as baffles for the dolomitzing fluids controlling lateral fluid flow and resulting in the stratabound dolostone distribution. During the post-dolomitization stage, stylolites became preferred pathways for overpressured hydrothermal corrosive and mineralizing fluids that likely came from the underlying basement, and increased bed-parallel stylolitic porosity and probably permeability as well",
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AU - Travé, A.

AU - Ameneiro, R.

AU - Koehn, D.

AU - Bons, P.D.

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PY - 2018

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N2 - This study investigates the late Aptian-early Albian platform carbonates of the Benicàssim area (Maestrat Basin, Spain) in order to assess the relationship between bed-parallel stylolites and the flow of diagenetic fluids during dolomitization and late hydrothermal alteration. Dolomite and burial dolomite and calcite cements were studied by a combination of field geology and standard petrographic and isotope analysis. The results indicate that dolostones are closely associated with seismic-scale synsedimentary faults. Dolostones preferentially replace grain-dominated facies and typically show wavy dolomitizing fronts that mostly correspond to bed-parallel stylolites. The dolostones are corroded and contain bed-parallel pores that are filled with hydrothermal saddle dolomite and late blocky calcite cements. This calcite cement frequently engulfs clasts of the host dolomite suggesting that hydraulic brecciation likely associated with overpressured fluid occurred. Results indicate that stylolites play a key role in the distribution of dolostones and subsequent hydrothermal mineralization. During the replacement stage, stylolites acted as baffles for the dolomitzing fluids controlling lateral fluid flow and resulting in the stratabound dolostone distribution. During the post-dolomitization stage, stylolites became preferred pathways for overpressured hydrothermal corrosive and mineralizing fluids that likely came from the underlying basement, and increased bed-parallel stylolitic porosity and probably permeability as well

AB - This study investigates the late Aptian-early Albian platform carbonates of the Benicàssim area (Maestrat Basin, Spain) in order to assess the relationship between bed-parallel stylolites and the flow of diagenetic fluids during dolomitization and late hydrothermal alteration. Dolomite and burial dolomite and calcite cements were studied by a combination of field geology and standard petrographic and isotope analysis. The results indicate that dolostones are closely associated with seismic-scale synsedimentary faults. Dolostones preferentially replace grain-dominated facies and typically show wavy dolomitizing fronts that mostly correspond to bed-parallel stylolites. The dolostones are corroded and contain bed-parallel pores that are filled with hydrothermal saddle dolomite and late blocky calcite cements. This calcite cement frequently engulfs clasts of the host dolomite suggesting that hydraulic brecciation likely associated with overpressured fluid occurred. Results indicate that stylolites play a key role in the distribution of dolostones and subsequent hydrothermal mineralization. During the replacement stage, stylolites acted as baffles for the dolomitzing fluids controlling lateral fluid flow and resulting in the stratabound dolostone distribution. During the post-dolomitization stage, stylolites became preferred pathways for overpressured hydrothermal corrosive and mineralizing fluids that likely came from the underlying basement, and increased bed-parallel stylolitic porosity and probably permeability as well

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JO - Geological Society Special Publications

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