Data report; Dolomite in Neogene sediments of the Belgica carbonate mound province, Porcupine Seabight, North Atlantic

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doi: 10.2204/iodp.proc.307.207.2009
Author(s): Gregg, Jay M.; Frank, Tracy D.
Integrated Ocean Drilling Program, Expedition 307 Scientists, College Station, TX
Author Affiliation(s): Primary:
Oklahoma State University, Boone Pickens School of Geology, Stillwater, OK, United States
Other:
Hiroshima University, Japan
Lamont-Doherty Earth Observatory, United States
Japan Agency of Marine-Earth Sciences, Japan
University of Tsukuba, Japan
Rosenstiel School of Marine and Atmospheric Science, United States
University of Copenhagen, Denmark
University of Nebraska-Lincoln, United States
Cardiff University, United Kingdom
Universitat de Barcelona, Spain
Universiteit Gent, Belgium
Toyama University, Japan
University of Hawaii at Manoa, United States
University of Missouri-Rolla, United States
National Oceanography Centre-Southampton, United Kingdom
Université de Provence, France
Chengdu University of Technology, China
GeoForschungsZentrum Potsdam, Federal Republic of Germany
Rice University, United States
University of Georgia, United States
Kanazawa Gakuin University, Japan
University of Rhode Island, United States
AIST/Geological Survey of Japan, Japan
Universität Erlangen-Nürnberg, Federal Republic of Germany
Volume Title: Proceedings of the Integrated Ocean Drilling Program; modern carbonate mounds; Porcupine drilling; Expedition 307 of the riserless drilling platform Dublin, Ireland, to Mobile, Alabama; Sites U1316-U1318, 25 April-30 May 2005
Volume Author(s): Ferdelman, Timothy; Kano, Akihiro; Williams, Trevor; Gaillot, Philippe; Abe, Kohei; Andres, Miriam S.; Bjerager, Morten; Browning, Emily L.; Cragg, Barry A.; de Mol, Ben; Foubert, Anneleen; Frank, Tracy D.; Fuwa, Yuji; Gharib, Jamshid J.; Gregg, Jay M.; Huvenne, Veerle Ann Ida; Leonide, Philippe; Li Xianghui; Magelsdorf, Kai; Novosel, Ivana; Sakai, Saburo; Samarkin, Vladimir A.; Sasaki, Keiichi; Spivack, Arthur J.; Takashima, Chizuru; Tanaka, Akiko; Titschack, Jürgen
Source: Proceedings of the Integrated Ocean Drilling Program; modern carbonate mounds; Porcupine drilling; Expedition 307 of the riserless drilling platform Dublin, Ireland, to Mobile, Alabama; Sites U1316-U1318, 25 April-30 May 2005, Timothy Ferdelman, Akihiro Kano, Trevor Williams, Philippe Gaillot, Kohei Abe, Miriam S. Andres, Morten Bjerager, Emily L. Browning, Barry A. Cragg, Ben de Mol, Anneleen Foubert, Tracy D. Frank, Yuji Fuwa, Jamshid J. Gharib, Jay M. Gregg, Veerle Ann Ida Huvenne, Philippe Leonide, Li Xianghui, Kai Magelsdorf, Ivana Novosel, Saburo Sakai, Vladimir A. Samarkin, Keiichi Sasaki, Arthur J. Spivack, Chizuru Takashima, Akiko Tanaka and Jürgen Titschack; Integrated Ocean Drilling Program, Expedition 307 Scientists, College Station, TX. Proceedings of the Integrated Ocean Drilling Program, Vol.307. Publisher: IODP Management International, Washington, DC, United States. ISSN: 1930-1014
Note: In English. 12 refs.; illus., incl. sect., sketch map
Summary: Dolomite was observed, using petrography, X-ray diffraction (XRD), and scanning electron microscopy (SEM), in cored Neogene sediments from the Porcupine Seabight in the north Atlantic Ocean, Integrated Ocean Drilling Program Expedition 307 Sites U1316, U1317, and U1318, ∼100 km off the west coast of Ireland. Trace amounts (<10% of total carbonate component) of dolomite were observed in Challenger Mound, a deep coldwater mixed siliciclastic-carbonate mud mound located in the Porcupine Seabight. Significant dolomitization (>50% of total carbonate component) was observed primarily in Miocene strata in submound and off-mound sediments. Petrographic examination of smear slides indicates that dolomite is composed of micrometer- to decimicron-sized, limpid, rhombic crystals. XRD analysis indicates that the dolomite is calcium rich and poorly ordered. SEM confirms light petrographic analysis of size and morphology of dolomite crystals, and electron microprobe analysis indicates that the dolomite is ferroan and displays distinct compositional zoning. Microbes and associated microbial filamentous structures were observed associated with dolomite crystals. Saturation indexes of carbonate minerals calculated for interstitial waters collected from the three sites are consistent with the petrographic and XRD observation of dolomite.
Year of Publication: 2009
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 06 Petrology, Sedimentary; Aragonite; Atlantic Ocean; Belgica Mounds; Biogenic structures; Bioherms; Boreholes; Calcite; Carbonates; Carbonatization; Cenozoic; Challenger Mound; Cores; Dolomite; Dolomitization; Electron probe data; Expedition 307; IODP Site U1316; IODP Site U1317; IODP Site U1318; Integrated Ocean Drilling Program; Marine sediments; Mineral composition; Miocene; Neogene; North Atlantic; Northeast Atlantic; Porcupine Seabight; Pore water; SEM data; Saturation; Sedimentary structures; Sediments; Tertiary; X-ray diffraction data
Coordinates: N512300 N512300 W0114400 W0114400
N512300 N512300 W0114300 W0114300
N512600 N512600 W0113300 W0113300
Record ID: 2009068388
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