Pleistocene chronology of continental margin sedimentation:

McHugh, C. M.; Olson, Hilary Clement

doi:10.1016/s0025-3227(02)00198-6

Cited by 41 publications

(55 citation statements)

References 72 publications

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“…The smaller scale cycles penetrated by Expedition 317 drilling are in part similar to the Milankovitch-scale rhythms documented from nearby ODP Site 1119 (Shipboard Scientific Party, 1999a;Carter and Gammon, 2006) and also the New Jersey shelf (McHugh and Olson, 2002) and correspond to cycles with inferred lengths of 100,000 and 40,000 years. The seismic stratigraphy of the sequences deposited during the last (MIS 1-5) and penultimate (MIS 6-7) glacial-interglacial cycles on the Canterbury and Otago shelves has been described by Browne and Naish (2003) and Osterberg (2006).…”

Section: Late Quaternary To Holocene Glacial-interglacial Cyclessupporting

confidence: 66%

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Fulthorpe

Hoyanagi

Blum

et al. 2010

IODP Preliminary Report

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Section: Late Quaternary To Holocene Glacial-interglacial Cyclessupporting

confidence: 66%

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Fulthorpe

Hoyanagi

Blum

et al. 2010

IODP Preliminary Report

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“…The smaller scale cycles penetrated during Expedition 317 drilling are similar in part to the Milankovitch-scale rhythms documented at nearby Site 1119 (Shipboard Scientific Party, 1999a;Carter and Gammon, 2004) and the New Jersey shelf (McHugh and Olson, 2002) and correspond to cycles with inferred lengths of 100,000 and 40,000 years. The seismic stratigraphy of the sequences deposited during the last (MIS 1-5) and penultimate (MIS 6-7) glacial-interglacial cycles on the Canterbury and Otago shelves has been described by Browne and Naish (2003) and Osterberg (2006).…”

Section: Pleistocene To Holocene Glacial-interglacial Cyclessupporting

confidence: 61%

Expedition summary

Fulthorpe

Hoyanagi

Crundwell

et al. 2011

Proceedings of the IODP

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“…Brothers et al, 2013). Along the New Jersey continental slope for example, sedimentation rates rose sharply during Pleistocene sea-level lowstand (Dugan and Flemings, 2002), with rates as high as 353 cm kyr −1 (McHugh and Olson, 2002). The age of the Baltimore Canyon authigenic carbonate further supports a link between rapid loading by organic-rich sediment during the Pleistocene sea-level lowstand and subsequent fluid flow from overpressure.…”

Section: Formation Model and Paleoenvironmentmentioning

confidence: 93%

Insights into methane dynamics from analysis of authigenic carbonates and chemosynthetic mussels at newly-discovered Atlantic Margin seeps

Prouty

Sahy

Ruppel

et al. 2016

Earth and Planetary Science Letters

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The recent discovery of active methane venting along the US northern and mid-Atlantic margin represents a new source of global methane not previously accounted for in carbon budgets from this region. However, uncertainty remains as to the origin and history of methane seepage along this tectonically inactive passive margin. Here we present the first isotopic analyses of authigenic carbonates and methanotrophic deep-sea mussels, Bathymodiolus sp., and the first direct constraints on the timing of past methane emission, based on samples collected at the upper slope Baltimore Canyon (∼385 m water depth) and deepwater Norfolk (∼1600 m) seep fields within the area of newly-discovered venting.The authigenic carbonates at both sites were dominated by aragonite, with an average δ 13 C signature of −47h, a value consistent with microbially driven anaerobic oxidation of methane-rich fluids occurring at or near the sediment-water interface. Authigenic carbonate U and Sr isotope data further support the inference of carbonate precipitation from seawater-derived fluids rather than from formation fluids from deep aquifers. Carbonate stable and radiocarbon (δ 13 C and 13 C) isotope values from living Bathymodiolus sp. specimens are lighter than those of seawater dissolved inorganic carbon, highlighting the influence of fossil carbon from methane on carbonate precipitation. U-Th dates on authigenic carbonates suggest seepage at Baltimore Canyon between 14.7 ± 0.6 ka to 15.7 ± 1.6 ka, and at the Norfolk seep field between 1.0 ± 0.7 ka to 3.3 ± 1.3 ka, providing constraint on the longevity of methane efflux at these sites. The age of the brecciated authigenic carbonates and the occurrence of pockmarks at the Baltimore Canyon upper slope could suggest a link between sediment delivery during Pleistocene sea-level lowstand, accumulation of pore fluid overpressure from sediment compaction, and release of overpressure through subsequent venting. Calculations show that the Baltimore Canyon site probably has not been within the gas hydrate stability zone (GHSZ) in the past 20 ka, meaning that in-situ release of methane from dissociating gas hydrate cannot be sustaining the seep. We cannot rule out updip migration of methane from dissociation of gas hydrate that occurs farther down the slope as a source of the venting at Baltimore Canyon, but consider that the history of rapid sediment accumulation and overpressure may play a more important role in methane emissions at this site. Published by Elsevier B.V.

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Pleistocene chronology of continental margin sedimentation:

Cited by 41 publications

References 72 publications

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Expedition summary

Insights into methane dynamics from analysis of authigenic carbonates and chemosynthetic mussels at newly-discovered Atlantic Margin seeps

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