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Unique authigenic mineral assemblages reveal different diagenetic histories in two neighbouring cold-water coral mounds on Pen Duick Escarpment, Gulf of Cadiz

(2012) SEDIMENTOLOGY. 59(2). p.578-604
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Abstract
Alpha Mound and Beta Mound are two cold-water coral mounds, located on the Pen Duick Escarpment in the Gulf of Cadiz amidst the El Arraiche mud volcano field where focused fluid seepage occurs. Despite the proximity of Alpha Mound and Beta Mound, both mounds differ in their assemblage of authigenic minerals. Alpha Mound features dolomite, framboidal pyrite and gypsum, whereas Beta Mound contains a barite layer and predominantly euhedral pyrite. The diagenetic alteration of the sedimentary record of both mounds is strongly influenced by biogeochemical processes occurring at shallow sulphate methane transition zones. The combined sedimentological, petrographic and isotopic analyses of early diagenetic features in gravity cores from Alpha Mound and Beta Mound indicate that the contrast in mineral assemblages between these mounds is caused by differences in fluid and methane fluxes. Alpha Mound appears to be affected by strong fluctuations in the fluid flow, causing shifts in redox boundaries, whereas Beta Mound seems to be a less dynamic system. To a large extent, the diagenetic egimes within cold-water coral mounds on the Pen Duick Escarpment appear to be controlled by fluid and methane fluxes deriving from layers underlying the mounds and forcings like pressure gradients caused by bottom current. However, it also becomes evident that authigenic mineral assemblages are not only very sensitive recorders of the diagenetic history of specific cold-water coral mounds, but also affect diagenetic processes in turn. Dissolution of aragonite, lithification by precipitation of authigenic minerals and subsequent brecciation of these lithified layers may also exert a control on the advective and diffusive fluid flow within these mounds, providing a feedback mechanism on subsequent diagenetic processes.
Keywords
Barite, calcite, cold-water coral mound, dolomite, gypsum, pyrite, sulphate methane transition zone, OXYGEN ISOTOPE FRACTIONATION, CONTINENTAL-MARGIN SEDIMENTS, ANAEROBIC METHANE OXIDATION, SULFATE-REDUCING BACTERIA, DOLOMITE FORMATION, ROCKALL TROUGH, MIDDLE MIOCENE, NE ATLANTIC, BLACK-SEA, BIOGEOCHEMICAL PROCESSES

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Citation

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MLA
Pirlet, Hans, et al. “Unique Authigenic Mineral Assemblages Reveal Different Diagenetic Histories in Two Neighbouring Cold-Water Coral Mounds on Pen Duick Escarpment, Gulf of Cadiz.” SEDIMENTOLOGY, vol. 59, no. 2, 2012, pp. 578–604, doi:10.1111/j.1365-3091.2011.01267.x.
APA
Pirlet, H., Wehrmann, L. M., Foubert, A., Brunner, B., Blamart, D., De Mol, L., … Henriet, J. (2012). Unique authigenic mineral assemblages reveal different diagenetic histories in two neighbouring cold-water coral mounds on Pen Duick Escarpment, Gulf of Cadiz. SEDIMENTOLOGY, 59(2), 578–604. https://doi.org/10.1111/j.1365-3091.2011.01267.x
Chicago author-date
Pirlet, Hans, Laura M Wehrmann, Anneleen Foubert, Benjamin Brunner, Dominique Blamart, Lies De Mol, David Van Rooij, et al. 2012. “Unique Authigenic Mineral Assemblages Reveal Different Diagenetic Histories in Two Neighbouring Cold-Water Coral Mounds on Pen Duick Escarpment, Gulf of Cadiz.” SEDIMENTOLOGY 59 (2): 578–604. https://doi.org/10.1111/j.1365-3091.2011.01267.x.
Chicago author-date (all authors)
Pirlet, Hans, Laura M Wehrmann, Anneleen Foubert, Benjamin Brunner, Dominique Blamart, Lies De Mol, David Van Rooij, Jan Dewanckele, Veerle Cnudde, Rudy Swennen, Philippe Duyck, and Jean Henriet. 2012. “Unique Authigenic Mineral Assemblages Reveal Different Diagenetic Histories in Two Neighbouring Cold-Water Coral Mounds on Pen Duick Escarpment, Gulf of Cadiz.” SEDIMENTOLOGY 59 (2): 578–604. doi:10.1111/j.1365-3091.2011.01267.x.
Vancouver
1.
Pirlet H, Wehrmann LM, Foubert A, Brunner B, Blamart D, De Mol L, et al. Unique authigenic mineral assemblages reveal different diagenetic histories in two neighbouring cold-water coral mounds on Pen Duick Escarpment, Gulf of Cadiz. SEDIMENTOLOGY. 2012;59(2):578–604.
IEEE
[1]
H. Pirlet et al., “Unique authigenic mineral assemblages reveal different diagenetic histories in two neighbouring cold-water coral mounds on Pen Duick Escarpment, Gulf of Cadiz,” SEDIMENTOLOGY, vol. 59, no. 2, pp. 578–604, 2012.
@article{2043084,
  abstract     = {{Alpha Mound and Beta Mound are two cold-water coral mounds, located on the Pen Duick Escarpment in the Gulf of Cadiz amidst the El Arraiche mud volcano field where focused fluid seepage occurs. Despite the proximity of Alpha Mound and Beta Mound, both mounds differ in their assemblage of authigenic minerals. Alpha Mound features dolomite, framboidal pyrite and gypsum, whereas Beta Mound contains a barite layer and predominantly euhedral pyrite. The diagenetic alteration of the sedimentary record of both mounds is strongly influenced by biogeochemical processes occurring at shallow sulphate methane transition zones. The combined sedimentological, petrographic and isotopic analyses of early diagenetic features in gravity cores from Alpha Mound and Beta Mound indicate that the contrast in mineral assemblages between these mounds is caused by differences in fluid and methane fluxes. Alpha Mound appears to be affected by strong fluctuations in the fluid flow, causing shifts in redox boundaries, whereas Beta Mound seems to be a less dynamic system. To a large extent, the diagenetic  egimes within cold-water coral mounds on the Pen Duick Escarpment appear to be controlled by fluid and methane fluxes deriving from layers underlying the mounds and forcings like pressure gradients caused by bottom current. However, it also becomes evident that authigenic mineral assemblages are not only very sensitive recorders of the diagenetic history of specific cold-water coral mounds, but also affect diagenetic processes in turn. Dissolution of aragonite, lithification by precipitation of authigenic minerals and subsequent brecciation of these lithified layers may also exert a control on the advective and diffusive fluid flow within these mounds, providing a feedback mechanism on subsequent diagenetic processes.}},
  author       = {{Pirlet, Hans and Wehrmann, Laura M and Foubert, Anneleen and Brunner, Benjamin and Blamart, Dominique and De Mol, Lies and Van Rooij, David and Dewanckele, Jan and Cnudde, Veerle and Swennen, Rudy and Duyck, Philippe and Henriet, Jean}},
  issn         = {{0037-0746}},
  journal      = {{SEDIMENTOLOGY}},
  keywords     = {{Barite,calcite,cold-water coral mound,dolomite,gypsum,pyrite,sulphate methane transition zone,OXYGEN ISOTOPE FRACTIONATION,CONTINENTAL-MARGIN SEDIMENTS,ANAEROBIC METHANE OXIDATION,SULFATE-REDUCING BACTERIA,DOLOMITE FORMATION,ROCKALL TROUGH,MIDDLE MIOCENE,NE ATLANTIC,BLACK-SEA,BIOGEOCHEMICAL PROCESSES}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{578--604}},
  title        = {{Unique authigenic mineral assemblages reveal different diagenetic histories in two neighbouring cold-water coral mounds on Pen Duick Escarpment, Gulf of Cadiz}},
  url          = {{http://doi.org/10.1111/j.1365-3091.2011.01267.x}},
  volume       = {{59}},
  year         = {{2012}},
}

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