Abstract
ACCORDING to the ideas of Hess1 the backbone of active mid-oceanic ridges should consist of peridotites which originated in the Earth's mantle and were subsequently upthrusted into the crust along the axis of ridges, above the up welling limbs of mantle's thermal convection cells. The ultramafics should lie below a layer of basalt about 1 km thick, generated by partial melting of the upwelling mantle material.
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References
Hess, H. H., in Petrologic Studies: A Volume in Honor of A. F. Buddington, 260 (Geological Society of America, New York, 1962).
Heezen, B. C., Bunce, E. T., Hersey, J. B., and Tharp, M., Deep Sea Res., 11, 11 (1964).
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BONATTI, E. Ultramafic Rocks from the Mid-Atlantic Ridge. Nature 219, 363–364 (1968). https://doi.org/10.1038/219363a0
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DOI: https://doi.org/10.1038/219363a0
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