Zoning in agate crystallizing in a medium enriched with silica, water, and trace elements may be caused by successive precipitation of the latter on the crystallization front. The Wang-Merino mathematical model of this ...
The accuracy of and detection limits for trace element analysis by the proton microprobe were determined using a stainless steel sample Gk-19 and glass samples prepared from whole rock reference powders JA-1 andesite, JB-1a ...