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Age and Rate of Accumulation of Metal-Rich Hydrothermal Deposits on the Seafloor: The Lucky Strike Vent Field, Mid-Atlantic Ridge

Abstract : Hydrothermal venting at the Lucky Strike hydrothermal field, located on the Mid-Atlantic Ridge, is associated with faulting linked to the tectonic dismemberment of a central axial volcano. Radium-226/Ba dating of hydrothermal barite indicates that hydrothermal venting is at least 6,600 years old, and that Lucky Strike is one of the youngest known vent fields on the Mid-Atlantic Ridge, which typically have ages exceeding 20 ka. Deposit volume calculations indicate that the total accumulated mass of the hydrothermal deposits on the seafloor at Lucky Strike is ∼1.3 ± 0.2 Mt, and that this mass accumulated at a maximum average rate of 194 ± 28 t/yr. This accumulation rate is comparable to other well characterized mid-ocean ridge hydrothermal sites, such as TAG and Endeavor, but at Lucky Strike is concentrated within a relatively small area of <2.5 km2.
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https://hal-insu.archives-ouvertes.fr/insu-03748525
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Submitted on : Tuesday, August 9, 2022 - 4:10:49 PM
Last modification on : Friday, October 21, 2022 - 3:34:06 PM

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Dennis Sánchez-Mora, John Jamieson, Mathilde Cannat, Javier Escartín, Thibaut Barreyre. Age and Rate of Accumulation of Metal-Rich Hydrothermal Deposits on the Seafloor: The Lucky Strike Vent Field, Mid-Atlantic Ridge. Journal of Geophysical Research : Solid Earth, 2022, 127, ⟨10.1029/2022JB024031⟩. ⟨insu-03748525⟩

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