Water Cooling the Earth's Crust: Seawater Penetrates Much Deeper Than Previously Thought
Credit: GEOMAR
“For our analyses, we had to push the electron-beam microprobe to its limits. It is a special scanning electron microscope, to which spectrometers are attached for the quantitative analysis of major, minor and trace element concentration”, van der Zwan explains. The microprobe, as well as other necessary devices, were available at GEOMAR. Furthermore, with the results of this study, the authors were able to verify theoretical models that were developed at GEOMAR.
“So far, it has been assumed that high pressure and temperatures prevented water from penetrating below 10 kilometres”, says Prof. Dr. Colin Devey, co-author of the GEOMAR study. “We can now show that the water penetrates much deeper”, Devey continues. This finding is important for the cooling of the oceanic crust and its heat budget, as well as for the total level of volatiles in the oceanic crust, which are later subducted and recycled into the mantle.
Contacts and sources:
Andreas Villwock
Contacts and sources:
Helmholtz Centre for Ocean Research Kiel (GEOMAR)
Citation: Lower crustal hydrothermal circulation at slow?spreading ridges: evidence from chlorine in Arctic and South Atlantic basalt glasses and melt inclusions. Authors: van der Zwan, F.M., C.W. Devey, T.H. Hansteen, R.R. Almeev, N. Augustin, M. Frische, K.M. Haase, A. Basaham, J.E. Snow, 2017 Con-trib. Mineral Petrol., 172:97, DOI 10.1007/s00410-017-1418-1 http://dx.doi.org/10.1007/s00410-017-1418-1
Source: http://www.ineffableisland.com/2017/11/water-cooling-earths-crust-seawater.html
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