RADIOGENIC ARGON AS AN INDICATOR OF THE I NHERITANCE OF MATERIAL DURING GLAUCONITE HYDROTHERMAL TRANSFORMATIONS

Excess radiogenic argon was discovered in the products of glauconite h ydrothermal alteration's at P-H2O = 1-2 kbar and T = 400-600 degrees C . The newly formed minerals are biotite and potassic feldspar. An isot opic analysis of The reaction products proves that the genetically exc ess argon was not captured from the fluid but inherited by the biotite from the original mineral. This proves the possibility that silicate matter can be inherited during solid-state transformations that procee d according to topotaxic mechanisms without complete dissolution in fl uid. The prospects of the use of radiogenic argon are considered from the standpoint of its employment as a tracer in studying the mechanism s of aluminosilicate transformations.