U/Th systematics and ages of authigenic carbonates from Hydrate Ridge, Cascadia Margin: recorders of fluid flow variations

Teichert, Barbara M.A.; Eisenhauer, Anton; Bohrmann, Gerhard; Haase-Schramm, Alexandra; Bock, Barbara; Линке, Петер

doi:10.1016/s0016-7037(03)00128-5

Cited by 182 publications

(127 citation statements)

References 42 publications

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“…Additionally, authigenic carbonates are amenable to uranium (U)-series dating techniques, and can provide key information on the timing and duration of fluid venting at each seep (Teichert et al, 2003;Bayon et al, 2009;Liebetrau et al, 2014). The isotopic composition of shells from chemosynthetic bivalves living close to fluid vents represents an important archive of the nature and variability of the venting.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…Such homogeneity is not at all surprising once we consider the overall reduced variability of cold seepage at the GBPF when compared to larger and heterogenous seep sites as those observable elsewhere in the ocean (Olu et al, 1997;Sibuet and Olu-Le Roy, 2002;Olu-Le Roy et al, 2007;Cordes et al, 2010), or even in the Mediterranean itself (OluLe Roy et al, 2004). Such variability often reflects primarily variations in the fluid regimes (Teichert et al, 2003). Nevertheless, minor faunal differences are equally observable at the GBPF such as, for example, the comparable rarity of the large chemosymbiotic clam L. kazani or of the large vestimentiferan Lamellibrachia which are not recorded thus far from more than two pockmarks.…”

Section: Discussionmentioning

confidence: 99%

The Gela Basin pockmark field in the strait of Sicily (Mediterranean Sea): chemosymbiotic faunal and carbonate signatures of postglacial to modern cold seepage

et al. 2013

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The geo-biological exploration of a pockmark field located at ca. 800 m below sea level in the Gela basin (Strait of Sicily, Central Mediterranean) provided a relatively diverse chemosymbiotic community and methane-imprinted carbonates. To date, this is the first occurrence of such a type of specialised deep-water cold-seep communities recorded from this key region, before documented in the Mediterranean as rather disjunct findings in its eastern and westernmost basins. The thiotrophic chemosymbiotic organisms recovered from this area include empty tubes of the vestimentiferan Lamellibrachia sp., loose and articulated shells of lucinids (Lucinoma kazani, Myrtea amorpha), vesicomyids (Isorropodon perplexum), and gastropods (Taranis moerchii). A callianassid decapod (Calliax sp.) was consistently found alive in large numbers in the pockmark mud. Their post-mortem calcified parts mixed with molluscs and subordinately miliolid foraminifers form a distinct type of skeletal assemblage. Carbonate concretions display δ¹³C values as low as −40‰ PDB suggesting the occurrence of light hydrocarbons in the seeping fluids. Since none of the truly chemosymbiotic organisms was found alive, although their skeletal parts appear at times very fresh, some specimens have been AMS-¹⁴C dated to shed light on the historical evolution of this site. Lamellibrachiav and Lucinoma are two of the most significant chemosymbiotic taxa reported from various Mediterranean cold seep sites (Alboran Sea and Eastern basin). Specimens from station MEDCOR78 (pockmark #1, Lat. 36°46´10.18" N, Long. 14°01´31.59" E, 815 m below sea level) provided ages of 11736 ± 636 yr cal BP (Lamellibrachia sp.), and 9609.5 ± 153.5 yr cal BP (L. kazani). One shell of M. amorpha in core MEDCOR81 (pockmark #6, Lat 36°45´38.89" N, Long 14°00´07.58" E, 822 m below sea level) provided a sub-modern age of 484 ± 54 yr cal BP. These ages document that fluid seepage at this pockmark site has been episodically sustaining thiotrophic macrobenthic communities since the end of the Younger Dryas stadial up to sub-recent times

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“…Recently, chronology combined with mineralogy, petrology, stable isotopes, and trace element geochemistry have been applied to shed light on the evolution of seep activity (Aharon et al, 1997;Bayon et al, 2009a,b;Feng et al, 2010b;Kutterolf et al, 2008;Liebetrau et al, 2010;Teichert et al, 2003;Watanabe et al, 2008). For example, U/Th ages of seep carbonates from Hydrate Ridge show that the occurrence of seep carbonate appears to have been correlated with the sea level lowstand during Pleistocene glaciale interglacial cycles (Teichert et al, 2003).…”

Section: 2mentioning

confidence: 99%

“…For example, U/Th ages of seep carbonates from Hydrate Ridge show that the occurrence of seep carbonate appears to have been correlated with the sea level lowstand during Pleistocene glaciale interglacial cycles (Teichert et al, 2003). Seeps have been particularly active during the last glaciation in the GOM and Sea of Japan (Feng et al, 2010b;Kutterolf et al, 2008;Watanabe et al, 2008).…”

Section: 2mentioning

confidence: 99%

Tracing the evolution of seep fluids from authigenic carbonates: Green Canyon, northern Gulf of Mexico

Bian

Dong

Roberts

et al. 2013

Marine and Petroleum Geology

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U/Th systematics and ages of authigenic carbonates from Hydrate Ridge, Cascadia Margin: recorders of fluid flow variations

Cited by 182 publications

References 42 publications

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

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

The Gela Basin pockmark field in the strait of Sicily (Mediterranean Sea): chemosymbiotic faunal and carbonate signatures of postglacial to modern cold seepage

Tracing the evolution of seep fluids from authigenic carbonates: Green Canyon, northern Gulf of Mexico

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