Geochemical evidence for meimechite magma generation in the subcontinentallithosphere of Polar Siberia

New data have been obtained on the distribution of the petrogenetic and rar e-earth elements in the meimechite-series of rocks in Polar Siberia. It is shown that the meimechites, alkali picrites, and khatangites are comagmatic . The compositions of the primitive melts for the meimechite series have be en estimated. It is suggested that the primary meimechite magmas were produ ced during the melting of lithosphere harzburgites that were enriched in in compatible elements due to infiltration of diapir melts with a low degree o f partial melting. (C) 2000 Elsevier Science Ltd. All rights reserved.