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Diagenetic formation of gypsum and dolomite in a cold-water coral mound in the Porcupine Seabight, off Ireland

Hans Pirlet UGent, Laura Wehrmann, Benjamin Brunner, Norbert Frank, Jan Dewanckele UGent, David Van Rooij UGent, Anneleen Foubert, Rudy Swennen, Lieven Naudts UGent, Matthieu Boone UGent, et al. (2010) SEDIMENTOLOGY. 57(3). p.786-805
abstract
Authigenic gypsum was found in a gravity core, retrieved from the top of Mound Perseverance, a giant cold-water coral mound in the Porcupine Basin, off Ireland. The occurrence of gypsum in such an environment is intriguing, because gypsum, a classic evaporitic mineral, is undersaturated with respect to sea water. Sedimentological, petrographic and isotopic evidence point to diagenetic formation of the gypsum, tied to oxidation of sedimentary sulphide minerals (i.e. pyrite). This oxidation is attributed to a phase of increased bottom currents which caused erosion and enhanced inflow of oxidizing fluids into the mound sediments. The oxidation of pyrite produced acidity, causing carbonate dissolution and subsequently leading to pore-water oversaturation with respect to gypsum and dolomite. Calculations based on the isotopic compositions of gypsum and pyrite reveal that between 21·6% and 28·6% of the sulphate incorporated into the gypsum derived from pyrite oxidation. The dissolution of carbonate increased the porosity in the affected sediment layer but promoted lithification of the sediments at the sediment-water interface. Thus, authigenic gypsum can serve as a signature for diagenetic oxidation events in carbonate-rich sediments. These observations demonstrate that fluid flow, steered by environmental factors, has an important effect on the diagenesis of coral mounds.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
dolomite, Cold-water coral, early diagenesis, gypsum, Lophelia, Porcupine Seabight, sulphur isotopes, NORTHEAST ATLANTIC, AUTHIGENIC GYPSUM, CARBONATE MOUNDS, SULFIDE OXIDATION, MEDITERRANEAN-SEA, DEEP, SEDIMENTS, SULFATE, PYRITE, ISOTOPE
journal title
SEDIMENTOLOGY
Sedimentology
volume
57
issue
3
pages
786 - 805
Web of Science type
Article
Web of Science id
000275647600003
JCR category
GEOLOGY
JCR impact factor
2.229 (2010)
JCR rank
6/48 (2010)
JCR quartile
1 (2010)
ISSN
0037-0746
DOI
10.1111/j.1365-3091.2009.01119.x
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
978200
handle
http://hdl.handle.net/1854/LU-978200
date created
2010-06-14 14:50:44
date last changed
2016-12-19 15:44:23
@article{978200,
  abstract     = {Authigenic gypsum was found in a gravity core, retrieved from the top of Mound Perseverance, a giant cold-water coral mound in the Porcupine Basin, off Ireland. The occurrence of gypsum in such an environment is intriguing, because gypsum, a classic evaporitic mineral, is undersaturated with respect to sea water. Sedimentological, petrographic and isotopic evidence point to diagenetic formation of the gypsum, tied to oxidation of sedimentary sulphide minerals (i.e. pyrite). This oxidation is attributed to a phase of increased bottom currents which caused erosion and enhanced inflow of oxidizing fluids into the mound sediments. The oxidation of pyrite produced acidity, causing carbonate dissolution and subsequently leading to pore-water oversaturation with respect to gypsum and dolomite. Calculations based on the isotopic compositions of gypsum and pyrite reveal that between 21{\textperiodcentered}6\% and 28{\textperiodcentered}6\% of the sulphate incorporated into the gypsum derived from pyrite oxidation. The dissolution of carbonate increased the porosity in the affected sediment layer but promoted lithification of the sediments at the sediment-water interface. Thus, authigenic gypsum can serve as a signature for diagenetic oxidation events in carbonate-rich sediments. These observations demonstrate that fluid flow, steered by environmental factors, has an important effect on the diagenesis of coral mounds.},
  author       = {Pirlet, Hans and Wehrmann, Laura and Brunner, Benjamin and Frank, Norbert and Dewanckele, Jan and Van Rooij, David and Foubert, Anneleen and Swennen, Rudy and Naudts, Lieven and Boone, Matthieu and Cnudde, Veerle and Henriet, Jean},
  issn         = {0037-0746},
  journal      = {SEDIMENTOLOGY},
  keyword      = {dolomite,Cold-water coral,early diagenesis,gypsum,Lophelia,Porcupine Seabight,sulphur isotopes,NORTHEAST ATLANTIC,AUTHIGENIC GYPSUM,CARBONATE MOUNDS,SULFIDE OXIDATION,MEDITERRANEAN-SEA,DEEP,SEDIMENTS,SULFATE,PYRITE,ISOTOPE},
  language     = {eng},
  number       = {3},
  pages        = {786--805},
  title        = {Diagenetic formation of gypsum and dolomite in a cold-water coral mound in the Porcupine Seabight, off Ireland},
  url          = {http://dx.doi.org/10.1111/j.1365-3091.2009.01119.x},
  volume       = {57},
  year         = {2010},
}

Chicago
Pirlet, Hans, Laura Wehrmann, Benjamin Brunner, Norbert Frank, Jan Dewanckele, David Van Rooij, Anneleen Foubert, et al. 2010. “Diagenetic Formation of Gypsum and Dolomite in a Cold-water Coral Mound in the Porcupine Seabight, Off Ireland.” Sedimentology 57 (3): 786–805.
APA
Pirlet, H., Wehrmann, L., Brunner, B., Frank, N., Dewanckele, J., Van Rooij, D., Foubert, A., et al. (2010). Diagenetic formation of gypsum and dolomite in a cold-water coral mound in the Porcupine Seabight, off Ireland. SEDIMENTOLOGY, 57(3), 786–805.
Vancouver
1.
Pirlet H, Wehrmann L, Brunner B, Frank N, Dewanckele J, Van Rooij D, et al. Diagenetic formation of gypsum and dolomite in a cold-water coral mound in the Porcupine Seabight, off Ireland. SEDIMENTOLOGY. 2010;57(3):786–805.
MLA
Pirlet, Hans, Laura Wehrmann, Benjamin Brunner, et al. “Diagenetic Formation of Gypsum and Dolomite in a Cold-water Coral Mound in the Porcupine Seabight, Off Ireland.” SEDIMENTOLOGY 57.3 (2010): 786–805. Print.