Slimline magma chambers

Article Abstract:

The magma chambers which lie below the mid-ocean ridges and which yield up the oceanic crust may be made up of narrow, hot crystal-melt mush zones beneath very thin lenses of pure melt. J.M. Sinton and R.S. Detrick relied on observational, geophysical, geochemical and computational data to propose a refinement of the traditional view that magma chambers are mostly liquid reservoirs varying in form. In reality, the chambers may be variegated structures marked by a hot transition zone.

Submarine geology, Marine geology

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Frozen magma lenses below the oceanic crust

Article Abstract:

The images of groups of Moho transition zone reflection events that resulted from the analysis of approximately 1,500 km of multichannel seismic data collected across the intermediate-spreading-rate Juan de Fuca ridge are presented. The observations suggest that gabbro lenses and melt accumulations embedded within dunite are the most probable cause for the observed reflectivity.

United States, Science & research, Oceanographic research, Mohorovicic discontinuity

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Portrait of a magma chamber

Article Abstract:

Issues are presented concerning the spreading centres which form around 20 square kilometers of ocean crust each year. The nature of the spreading centres of the mid-ocean-ridge systems are discussed.

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