In:
Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 99, No. B2 ( 1994-02-10), p. 3163-3173
Abstract:
Vein carbonates from a variety of ocean crust environments have been analyzed for Sr contents and Sr and oxygen isotopic compositions. Veins from upper crustal lithologies typically have low formation temperatures ( 〈 100°C) and form within 10–15 m.y. after crust formation, from solutions containing a basaltic component of very high Ca/Sr ( 〉 30 times that of hot smoker vent fluids). Veins from the gabbro lithologies at site 735B show both high ( 〉 150°C) and very low ( 〈 10°C) formation temperatures. The high‐temperature carbonate veins have a large basaltic component (low 87 Sr/ 86 Sr) with low Ca/Sr and probably formed before unroofing of this deep crustal block. The low‐temperature veins have only a minor basaltic component, and formed after unroofing, but within 0–10 m.y. of crust formation. Hot smoker vent fluids represent the low Ca/Sr limit of fluids recorded by carbonate veins and thus cannot describe the totality of the seawater‐ocean crust Ca/Sr exchange budget.
Type of Medium:
Online Resource
ISSN:
0148-0227
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1994
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