MIXED-LAYER BIOTITE-CHLORITE FORMED IN THE COURSE OF LOCAL EPIGENESIS IN THE WEATHERING CRUST OF A BIOTITE GNEISS

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SUMMARY

In the course of deep weathering of a biotite gneiss, biotite is transformed into mixed-layer biotite-vermiculite hydrobiotite. Later biotite-vermiculite is transformed into biotite-chlorite under the action of hydrothermal solutions at the stage of epigenesis.

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