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Pockmarks in Passamaquoddy Bay, New Brunswick, Canada

L. L. Brothers, C. Legere, J. E. Hughes Clarke, J. T. Kelley, W. A. Barnhardt, B. D. Andrews and D. F. Belknap
Geological Society, London, Memoirs, 46, 111-112, 30 November 2016, https://doi.org/10.1144/M46.60
L. L. Brothers
1US Geological Survey, 384 Woods Hole Road, Woods Hole, Massachusetts 02540, USA
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C. Legere
2Department of Geography, Memorial University of Newfoundland, St John's, Newfoundland and Labrador A1B 3X9, Canada
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J. E. Hughes Clarke
3Ocean Mapping Group, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada
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J. T. Kelley
4School of Earth and Climate Sciences, University of Maine, Orono, Maine 04469 USA
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W. A. Barnhardt
1US Geological Survey, 384 Woods Hole Road, Woods Hole, Massachusetts 02540, USA
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B. D. Andrews
1US Geological Survey, 384 Woods Hole Road, Woods Hole, Massachusetts 02540, USA
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D. F. Belknap
4School of Earth and Climate Sciences, University of Maine, Orono, Maine 04469 USA
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Pockmarks are seafloor depressions associated with fluid escape (Judd & Hovland 2007). They proliferate in the muddy seafloors of coastal Gulf of Maine and Bay of Fundy, where they are associated with shallow natural gas likely of biogenic origin (Ussler et al. 2003; Rogers et al. 2006; Wildish et al. 2008). In North America, shallow-water pockmark fields are not reported south of Long Island Sound, despite the abundance of gassy, muddy estuaries. The absence of pockmarks south of the limit of North American glaciation suggests that local and regional heterogeneities, possibly related to glacial or sea-level history or bedrock geology, influence pockmark field distribution. In shallow-water embayments, such as Passamaquoddy Bay, New Brunswick, pockmarks can be large (>200 m diameter) and number in the thousands.

Description

Over 4500 pockmarks litter the seafloor of Passamaquoddy Bay. These pockmarks are within 5 km of shore in water depths ranging from 7 to 80 m (Fig. 1a). Occurring either as discrete depressions or in linear chains, pockmarks are generally circular with concave sidewall …

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Geological Society, London, Memoirs: 46 (1)
Geological Society, London, Memoirs
Volume 46
2016
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Pockmarks in Passamaquoddy Bay, New Brunswick, Canada

L. L. Brothers, C. Legere, J. E. Hughes Clarke, J. T. Kelley, W. A. Barnhardt, B. D. Andrews and D. F. Belknap
Geological Society, London, Memoirs, 46, 111-112, 30 November 2016, https://doi.org/10.1144/M46.60
L. L. Brothers
1US Geological Survey, 384 Woods Hole Road, Woods Hole, Massachusetts 02540, USA
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: lbrothers@usgs.gov
C. Legere
2Department of Geography, Memorial University of Newfoundland, St John's, Newfoundland and Labrador A1B 3X9, Canada
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
J. E. Hughes Clarke
3Ocean Mapping Group, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada
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  • Find this author on PubMed
  • Search for this author on this site
J. T. Kelley
4School of Earth and Climate Sciences, University of Maine, Orono, Maine 04469 USA
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  • Find this author on PubMed
  • Search for this author on this site
W. A. Barnhardt
1US Geological Survey, 384 Woods Hole Road, Woods Hole, Massachusetts 02540, USA
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B. D. Andrews
1US Geological Survey, 384 Woods Hole Road, Woods Hole, Massachusetts 02540, USA
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D. F. Belknap
4School of Earth and Climate Sciences, University of Maine, Orono, Maine 04469 USA
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Pockmarks in Passamaquoddy Bay, New Brunswick, Canada

L. L. Brothers, C. Legere, J. E. Hughes Clarke, J. T. Kelley, W. A. Barnhardt, B. D. Andrews and D. F. Belknap
Geological Society, London, Memoirs, 46, 111-112, 30 November 2016, https://doi.org/10.1144/M46.60
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