FN Archimer Export Format
PT J
TI Modeling of hydrogen production by serpentinization in ultramafic-hosted hydrothermal systems: Application to the Rainbow field
BT 
AF MUGLER, C.
   JEAN-BAPTISTE, P.
   PEREZ, Florian
   CHARLOU, Jean-Luc
AS 1:1;2:1;3:1,2;4:2;
FF 1:;2:;3:PDG-REM-GM-LGM;4:PDG-REM-GM-LCG;
C1 UVSQ, Lab Sci Climat & Environm, UMR 8212, CEA,CNRS, F-91191 Gif Sur Yvette, France.
   IFREMER Brest, Dept Geosci Marines, Plouzane, France.
C2 UNIV VERSAILLES, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-REM-GM-LGM
   PDG-REM-GM-LCG
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 2.687
TC 3
UR https://archimer.ifremer.fr/doc/00314/42514/41906.pdf
LA English
DT Article
DE ;first-order kinetic law;hydrothermal system;Rainbow vent site;reaction rate;serpentinization
AB The production of hydrogen by serpentinization in ultramafic-hosted hydrothermal systems is simulated by coupling thermodynamic and dynamic modeling in the framework of a thermo-hydraulic single-pass model where a high-temperature hydrothermal fluid moves preferentially through a main canal of high permeability. The alteration of ultramafic rocks is modeled with a first-order kinetic formulation, wherein the serpentinization rate coefficient, Kr, takes the form: Kr = A exp(−α(T − T0)2). In this formulation, α determines the temperature range of the reaction and T0 is the temperature at which the serpentinization rate reaches its maximum. This model is applied to the Rainbow hydrothermal system, which is situated on the Mid-Atlantic Ridge, and characterized by a high temperature, a high mass flux, and a very high hydrogen concentration. The results show that a first-order kinetic law gives a useful representation of the kinetics of serpentinization. The estimated value for the parameter A in the temperature-dependent formulation of the serpentinization rate coefficient lies in the range (1–5) × 10−11 s−1. This effective parameter is several orders of magnitude lower than the values obtained from small grain-size experiments, but in agreement with other published modeling studies of natural systems. Numerical simulations show that the venting site is able to produce the observed high concentration of hydrogen during the whole continuous lifetime of the Rainbow site.
PY 2016
PD AUG
SO Geofluids
SN 1468-8115
PU Wiley-blackwell
VL 16
IS 3
UT 000380956400010
BP 476
EP 489
DI 10.1111/gfl.12169
ID 42514
ER

EF