Rubidium and Strontium chemistry of oceanic crust, supplement to: Hart, Stanley R; Staudigel, Hubert (1978): Oceanic Crust: Age of hydrothermal alteration. Geophysical Research Letters, 5(12), 1009-1012

Stanley R Hart & Hubert Staudigel
Times of vein mineral deposition in the ocean crust have been determined both by Rb-Sr isochron ages of vein smectites and by comparison of 87Sr/86Sr ratios of vein calcites with the known variations of seawater 87Sr/86Sr ratio with time. Results from drilling sites 105, 332B and 418A, Atlantic Ocean, which have basement formation ages of 155 m.y., 3.5 m.y., and 110 m.y., respectively, show that vein deposition is essenrially complete within 5-10 m.y. after formation...
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