Geochemical Peculiarities of Some Rock-Forming Minerals during Experimental Modeling of Shock Metamorphism

摘要

(1) REEs and minor elements, as well as major chemical components of garnets and biotites with rare exclusions are poorly sensitive to the shock influence during experimental modeling of shock metamor-phism within the abovementioned limits.rn(2) The most mobile among REEs are LREEs (La and Ce) accumulated in garnet and Gd with the concentration decreasing during shock loading. Among minor elements, Ba, Rb, Sr, and Nb crystallochemically incompatible for garnet demonstrate a tendencyrnof accumulation in this mineral. The concentrations of Ba and Cr compatible for biotite decrease as a result of the experiment.rn(3) REEs in garnet behave as three independent groups as a result of the experiment: LREEs, MREEs, and HREEs. There is no such division in biotites.