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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

Hans Pirlet UGent, Laura M Wehrmann, Anneleen Foubert, Benjamin Brunner, Dominique Blamart, Lies De Mol UGent, David Van Rooij UGent, Jan Dewanckele UGent, Veerle Cnudde UGent and Rudy Swennen, et al. (2012) SEDIMENTOLOGY. 59(2). p.578-604
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.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
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
journal title
SEDIMENTOLOGY
Sedimentology
volume
59
issue
2
pages
578 - 604
Web of Science type
Article
Web of Science id
000299155300011
JCR category
GEOLOGY
JCR impact factor
2.611 (2012)
JCR rank
6/47 (2012)
JCR quartile
1 (2012)
ISSN
0037-0746
DOI
10.1111/j.1365-3091.2011.01267.x
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2043084
handle
http://hdl.handle.net/1854/LU-2043084
date created
2012-02-23 20:46:47
date last changed
2012-04-02 13:40:22
@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 \unmatched{fb01}eld where focused \unmatched{fb02}uid 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 in\unmatched{fb02}uenced 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 \unmatched{fb02}uid and methane \unmatched{fb02}uxes. Alpha Mound appears to be affected by strong \unmatched{fb02}uctuations in the \unmatched{fb02}uid \unmatched{fb02}ow, 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 \unmatched{fb02}uid and methane \unmatched{fb02}uxes 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 speci\unmatched{fb01}c cold-water coral mounds, but also affect diagenetic processes in turn. Dissolution of aragonite, lithi\unmatched{fb01}cation by precipitation of authigenic minerals and subsequent brecciation of these lithi\unmatched{fb01}ed layers may also exert a control on the advective and diffusive \unmatched{fb02}uid \unmatched{fb02}ow 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},
  keyword      = {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://dx.doi.org/10.1111/j.1365-3091.2011.01267.x},
  volume       = {59},
  year         = {2012},
}

Chicago
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.
APA
Pirlet, H., Wehrmann, L. M., Foubert, A., Brunner, B., Blamart, D., De Mol, L., Van Rooij, D., 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.
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.
MLA
Pirlet, Hans, Laura M Wehrmann, Anneleen Foubert, 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 59.2 (2012): 578–604. Print.