Normative quartz as an indicator of the mass transfer intensity during the postmagmatic alteration of the Botuobinskaya pipe kimberlites (Yakutia)

摘要: Abstract The intensity of postmagmatic processes in the Botuobinskaya pipe kimberlites was estimated from calculated content normative secondary quartz (Q). Several simple algorithms are proposed to calculate Q chemical analyses kimberlites. Ten groups altered have been recognized contents. contents MgO, some trace elements, and LREE groups, Cr Ca crimson garnets, diamond kimberlites, average weight diamonds decrease as increases. It is shown that negative SiO 2 –MgO correlation most effective indicator alteration As degree their increases, transform into an assemblage clay minerals enriched elements almost completely lacking REE diamonds.