Micaschists Edough Massif Metamorphism Mineralogy Chemical Mobility Algeria Garnet

The “upper unit” micaschists of the Edough Massif have undergone a low to moderate degree of metamorphism. The studied micaschists are composed of two distinct groups of rocks that are characterized by a typical metamorphic mineralogy. A first group comprises only weakly foliated garnet micaschists. The second group, located near the first, lacks garnet but contains large amounts of andalusite blasts. This obvious change in mineralogy indicates mobility of matter. This mobility is documented by evaluating the transfer using chemical and mineralogical variations in successive petrographic rock samples. In the micaschists of the Edough Massif, the transition from garnet micaschists to andalusite micaschists is not due to local changes of thermobarometric conditions. All rocks suffered the same P-T conditions. Neither can the mineralogical change be attributed to alteration. The variation of the chemical alteration Index (CIA) is not significant. The mineralogical changes thus are attributed to circulation of fluids that were freed during deformation.

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