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Hart et al. 1994

Hart, S.R., Blusztajn, J., Dick, H.J.B. and Lawrence, J.R. (1994). Fluid Circulation in the Oceanic-Crust - Contrast between Volcanic and Plutonic Regimes. Journal of Geophysical Research, Solid Earth 99(B2): 3,163-3,173.

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-degrees-C) and from 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-degrees-C) and very low (<10-degrees-C) formation temperatures. The high-temperature carbonate veins have a large basaltic component (low Sr-87/Sr-86) 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 0-40 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.

BACKGROUND DATA FILES

	Abstract

	Table 1
	Table 2
	Table 3

	Analytical Techniques

Keywords
strontium isotopic composition, dsdp interstitial waters, deep-sea sediments, east pacific rise, costa-rica rift, hydrothermal alteration, distribution coefficients, seawater sr-87/sr-86, calcite, chemistry

Journal
Journal of Geophysical Research, Solid Earth

Publisher
American Geophysical Union