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Unusual Lath-Shaped Garnet-Zoisite Intergrowth Textures from a UHP Zoisite-Quartz Fels, Dora Maira, Northwest Italy: An EBSD Case Study

Intergrowth textures of garnet and zoisite have been discovered in the coesite-bearing unit of the Dora Maira Massif near Bastoneri, Valle Gilba. Garnet is rich in grossular- and almandine-component and forms lath-shaped lamellae that are oriented parallel to (100) of zoisite. Electron backscatter diffraction (EBSD) studies show that zoisite/garnet symplectites typically form clusters where the crystallographical c-axes of each zoisite are characterized by a planar orientation. No epitaxial relationship between the structures of zoisite and garnet was recognized. Three different but typical examples of garnet lamellae can be distinguished where (1) one single garnet lamella has one distinct crystallographical orientation, (2) one single garnet lamella exhibits different domains of random orientations, and (3) different parts of a single garnet lamella show in general the same crystallographical orientation but contain microdomains of different orientations that were repeated by 30° along a great circle. In all probability these garnet lamellae are exsolved from an earlier-generation epidote-group mineral. A potential mechanism of formation is the break down of the former clinozoisite/epidote precursor during metamorphism due to a reduction of trivalent iron to form grossular/almandine lamellae in zoisite. High amounts of divalent cations in the precursor may play a significant role in that their incorporation is favored by pressure. Pressure release during exhumation of the rocks could then lead to the "exsolution" of garnet from precursor clinozoisite/epidote.