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Zircon Dating of Oceanic Crustal Accretion

Abstract : Most of Earth’s present-day crust formed at mid-ocean ridges. High-precision uranium-lead dating of zircons in gabbros from the Vema Fracture Zone on the Mid-Atlantic Ridge reveals that the crust there grew in a highly regular pattern characterized by shallow melt delivery. Combined with results from previous dating studies, this finding suggests that two distinct modes of crustal accretion occur along slow-spreading ridges. Individual samples record a zircon date range of 90,000 to 235,000 years, which is interpreted to reflect the time scale of zircon crystallization in oceanic plutonic rocks.
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Submitted on : Thursday, March 10, 2022 - 4:43:24 PM
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C. Johan Lissenberg, Matthew Rioux, Nobumichi Shimizu, Samuel A. Bowring, Catherine Mével. Zircon Dating of Oceanic Crustal Accretion. Science, 2009, 323, pp.1048. ⟨10.1126/science.1167330⟩. ⟨insu-03604914⟩



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