Origin of potash-rich basic lamprophyres: trace element data from Arizona minettes

Details Origin of potash-rich basic lamprophyres: trace element data from Arizona minettes Origin of potash-rich basic lamprophyres: trace element data from Arizona minettes

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..57..305r&link_type=abstract

Earth and Planetary Science Letters, Volume 57, Issue 2, p. 305-312.

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Scientific paper

Rare earth and selected trace element analyses of 15 minettes (mica lamprophyres) from the Navajo volcanic field are presented and compared with similar data from kimberlites and selected basic rocks. Despite a superficial similarity, it is shown that significant differences exist between the REE abundances of kimberlites and those of minettes and basic rocks. The data suggest that the petrogenesis of minettes is more comparable to that of other basic magmas, minette magma being formed by limited partial melting of garnet lherzolite under volatile-rich conditions. The volatile phase, considered to have been derived from below the zone of partial melting, is thought to possess a low CO2/(CO2 + H2O) ration, in contrast to the CO2-rich vapour phases that control the formation of other basic magmas.

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