Data report: dolomite in Neogene sediments of the Belgica carbonate mound province, Porcupine Seabight, North Atlantic
Open accessAbstract
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 silicaclastic-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.
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- Authors
- Gregg, J. M., & Frank, T. D.
- Affiliations
- Oklahoma State University (US)
- University of Nebraska–Lincoln (US)
- Corresponding author
- Gregg, J.M.
- Venue
- Proceedings of the IODP
- Publisher
- Integrated Ocean Drilling Program
- Published
- 2009
- ISSN
- 1930-1014 (ISSN-L)
- OpenAlex
- W2484096918
- Cited by
- 7
- References
- 5
- Citations by year
- 2026: 1 · 2023: 1 · 2022: 1 · 2021: 3 · 2017: 1
- FWCI
- 0.00
- Type
- book chapter
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Proceedings of the Integrated Ocean Drilling Program. Expedition reports/Proceedings of the Integrated Ocean Drilling Program (publishedVersion)
- Funders
- Consortium for Ocean Leadership
- Oklahoma State University
- United States Science Support Program
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Methane Hydrates and Related Phenomena
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Keywords
- dolomite, dolomitization, Neogene sediments, carbonate mounds, Porcupine Seabight, ferroan dolomite, microbial filaments, carbonate saturation state, Miocene strata
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