Rubidium and Strontium chemistry of oceanic crust

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 Ocea...

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Bibliographic Details
Main Authors: Hart, Stanley R, Staudigel, Hubert
Format: Dataset
Language:English
Published: PANGAEA 1978
Subjects:
11-105
37-332B
51-417A
52-418A
Deep Sea Drilling Project
DRILL
Drilling/drill rig
DSDP
Glomar Challenger
Leg11
Leg37
Leg51
Leg52
North Atlantic/CONT RISE
North Atlantic/HILL
North Atlantic/VALLEY
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.708668
https://doi.org/10.1594/PANGAEA.708668
Description
Summary: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 of the basaltic crust. This provids direct evidence that hydrothermal circulation of sea-water through the oceanic crust is an important process for only 5-10 m.y. after crust formation.

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