Contact aureole between tonalitic melt and diopside marble, Precambrian basement of Estonia
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Contact aureole between tonalitic melt and diopside marble, Precambrian basement of Estonia

by Sophie Graul, Tallinn University of Technology, Tallinn, Estonia and France

Polished section of a marble body intruded by a tonalite vein. The first, dark layer of contact is composed of biotite. Then, a diopside-dominant horizon, followed by a calcite and pyrrhotite matrix.