The significance of sheeted dike complexes in ophiolites ... mid-ocean ridge magma reservoirs and their sheeted-dike complex: A ... with both late-stage fractional crystallization and partial ... Adult onset epilepsies FERGUS J. RUGG-GUNN Department of Clinical and Experimental Epilepsy, National Hospital for Neurology and Neurosurgery, Queen Square, London Not all seizures occurring during adult life are due to epilepsy. Many are acute symptomatic seizures which must be recognised to avoid inappropriate antiepileptic drug (AED) treatment. In ophiolites and in present-day oceanic crust formed at fast spreading ridges, oceanic plagiogranites are commonly observed at, or close to the base of the sheeted dike complex. They can be produced either by differentiation of mafic melts, or by hydrous partial melting of the hydrothermally altered sheeted dikes.

Our results demonstrate that hydrous partial melting is a likely common process in the root zone of the sheeted dike complex, starting at temperatures exceeding 850A degrees C. The newly formed melt can either crystallize to form oceanic plagiogranites or may be recycled within the melt lens resulting in hybridized and contaminated MORB melts. Seizures are brought on by surges of electrical energy in your brain. With a complex partial seizure, the surge happens only on one side and in a specific area. It’s called “partial” because only one part of your brain is affected. During this type of seizure, you may not be able to control your movements or talk.