Recharge flux to ocean-ridge black smoker systems: a geochemical estimate from ODP Hole 504b
Recharge flux to ocean-ridge black smoker systems: a geochemical estimate from ODP Hole 504b
We use the Sr-isotopic composition of rock and anhydrite, as a monitor of fluid composition, in DSDP/ODP Hole 504B to calculate the recharge flux to the axial high-temperature hydrothermal circulation. The fluid and rock Sr-isotope profiles are well fit by a tracer transport mass-balance model that approximates fluid-solid exchange by linear kinetics. The calculated time-integrated flux of 1.7+/-0.2 x 106 kg m-2 is significantly less than the 5 x 106 kg m-2 calculated from thermal models that assume all magma is intruded into a high-level magma chamber at the base of the sheeted dykes. Our low flux is consistent with the observed thermal structure as recorded by secondary alteration minerals in Hole 504B and the intrusion of magma as lenses distributed through the lower oceanic crust. It leaves open the questions as to how the lower oceanic crust cools and how seawater geochemical budgets balance
ocean ridge, hydrothermal, Sr isotopes, ocean drilling program, anhydrite
81-89
Teagle, D.A.H.
396539c5-acbe-4dfa-bb9b-94af878fe286
Bickle, M.J.
17cc896b-f3fc-43a4-b374-b8f8defc93b1
Alt, J.C.
15bc6ffe-26c5-4c34-bb91-f4d076811e28
2003
Teagle, D.A.H.
396539c5-acbe-4dfa-bb9b-94af878fe286
Bickle, M.J.
17cc896b-f3fc-43a4-b374-b8f8defc93b1
Alt, J.C.
15bc6ffe-26c5-4c34-bb91-f4d076811e28
Teagle, D.A.H., Bickle, M.J. and Alt, J.C.
(2003)
Recharge flux to ocean-ridge black smoker systems: a geochemical estimate from ODP Hole 504b.
Earth and Planetary Science Letters, 210 (1-2), .
(doi:10.1016/S0012-821X(03)00126-2).
Abstract
We use the Sr-isotopic composition of rock and anhydrite, as a monitor of fluid composition, in DSDP/ODP Hole 504B to calculate the recharge flux to the axial high-temperature hydrothermal circulation. The fluid and rock Sr-isotope profiles are well fit by a tracer transport mass-balance model that approximates fluid-solid exchange by linear kinetics. The calculated time-integrated flux of 1.7+/-0.2 x 106 kg m-2 is significantly less than the 5 x 106 kg m-2 calculated from thermal models that assume all magma is intruded into a high-level magma chamber at the base of the sheeted dykes. Our low flux is consistent with the observed thermal structure as recorded by secondary alteration minerals in Hole 504B and the intrusion of magma as lenses distributed through the lower oceanic crust. It leaves open the questions as to how the lower oceanic crust cools and how seawater geochemical budgets balance
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Published date: 2003
Keywords:
ocean ridge, hydrothermal, Sr isotopes, ocean drilling program, anhydrite
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Local EPrints ID: 2158
URI: http://eprints.soton.ac.uk/id/eprint/2158
ISSN: 0012-821X
PURE UUID: 956a6237-2b46-44cb-90d6-22e7bdfb0dc3
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Date deposited: 14 May 2004
Last modified: 16 Mar 2024 03:14
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Author:
M.J. Bickle
Author:
J.C. Alt
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