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Thanks to a still important hydrothermalism at this depth, the varitextured gabbros, just below the dyke complex, can be metamorphized. A black corona of amphibole surrounds the clinopyroxene. The amphibole, from brown to green under the microscope, records the different steps of the cooling of the gabbro since the tardi-magmatic conditions until the conditions of the Greenschists facies. Wadi Abyad.
PhotoID293

Thanks to a still important hydrothermalism at this depth, the varitextured gabbros, just below the dyke complex, can be metamorphized. A black corona of amphibole surrounds the clinopyroxene. The amphibole, from brown to green under the microscope, records the different steps of the cooling of the gabbro since the tardi-magmatic conditions until the conditions of the Greenschists facies. Wadi Abyad.
PhotoID293

Photograph: ch.nicollet

Reference: http://christian.nicollet.free.fr/page/oman/metamRide/omanMetamRide.html