Previous Group Members
Chen Feng You (Taiwan), A. Davis (Perth)
Hydrothermal circulation at ocean ridges, which passes the mass of the oceans through the ocean crust every ~ 30 Ma, buffers ocean chemistry, transports a significant fraction of the Earth’s heat flow and plays a fundamental role in geochemical fluxes between the solid Earth, oceans and atmosphere. However there are major uncertainties in both the magnitude of the hydrothermal fluxes (see Davis et al., 2003) and the structure of the hydrothermal systems.
We have been studying the structure of oceanic hydrothermal systems in ophiolites (Troodos and Oman, Teagle & Bickle, 1992; Benyon et al., 1998), modelling hydrothermal fluxes from geochemical alteration of the oceanic crust (Teagle et al., 2003), studying the chronology of oceanic sulphide mounds (You & Bickle, 1999) and modelling the thermal evolution of oceanic spreading ridges (Maclennan). Particularly spectacular are the epsidosite zones in the Semail ophiolite, Oman, which Amy Davis (unpublished Cambridge PhD) showed were related to three or more phases of hydrothermal activity and could be mapped from the top of the gabbros, through the sheeted dykes and into the lavas. Each phase of hydrothermal activity exhibits a distinctive range of 87Sr/86Sr ratios.
Publications From This Work
- Davis, A., Bickle, M.J., and Teagle, D.A.H. (2003) Imbalance in the oceanic strontium budget, Earth and Planetary Science Letters 211, 173-187.
- Teagle, D.A.H., M.J. Bickle, J.C. Alt (2003) Recharge flux to ocean-ridge black smoker systems: a geochemical estimate from ODP Hole 504B, Earth and Planetary Science Letters 210, 81-89.
- Bickle, M.J., Teagle, D.A.H., Beynon, J., Chapman, H. J. (1998) The structure and controls on fluid-rock interactions in ocean ridge hydrothermal systems: constraints from the Troodos ophiolite. Special Publication of the Geological Society of London, 148, 127-152
- Bickle, M.J., Alt, J.C., Teagle, D.A.H. (1994) Sulphur transport and sulphur isotope fractionations in ocean floor hydrothermal systems. Mineralogical Magazine, 58A, 88-89
- Bickle, M.J., Teagle, D.A.H. (1992) Strontium alteration in the Troodos ophiolite: implications for fluid fluxes and geochemical transport in mid-ocean ridge hydrothermal systems. Earth and Planetary Science Letters, 113, 219-237.
- Maclennan, J., T. Hulme, and S. C. Singh, Cooling of the lower oceanic crust, Geology, 33, 357-360, 2005. [online article]
- Maclennan, J., T. Hulme, and S. C. Singh, Thermal models of oceanic crustal accretion: Linking geophysical, geological and petrological observations, Geochem. Geophys. Geosyst., 5, Q02F25, doi:10.1029/2003GC000605, 2004. [online article]
- Wilson, D.S. and 52 others, Drilling to gabbro in intact ocean crust, Science, 312, 1016-1020, 2006. [online article]
- Cannat, M., J. Cann and J. Maclennan, Some hard rock constraints on the supply of heat to mid-ocean ridges, In: Mid-ocean ridges: Hydrothermal Interactions between the Lithosphere and Oceans, edited by C.R. German, J. Lin and L.M Parson, Geophys. Monogr. Ser.,vol. 148, AGU, Washington, D.C., 2004.
Last updated on 21-Nov-08 17:12