Abstract
Hematitic zones tens of kilometres wide occur in highly metamorphosed terranes; several lie within shear zones. Rocks are characterized by hematiterich Rhombohedral, now represented by exsolved hematite and ilmenite, coexisting with magnetite and by Mg-rich pyroxenes, the result of Fe being partitioned into oxides. Causes for oxidation have not been discussed in the literature, other than some being attributed to oxidized sedimentary protoliths. However, rocks of diverse origins are affected. We suggest that oxidation was by SO2bearing magmatic fluids; infiltration was facilitated by dilation during deformation. There is invariably evidence for intrusion of marie magma into or below the hematite-beating zones.
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