Fluorine-bearing phases in lamproites

摘要: The distribution of F between phlogopite, amphibole, apatite, and glass has been determined for 261amproites from Leucite Hills, Wyoming; West Kimberley, Western Australia; Smoky Butte, Montana; Prairie Creek, Arkansas; Gaussberg, Antarctica. contents these phases are inconsistent in different lamproite localities, with distinct variations, example, the Hills Kimberley lamproites. Fluorine commonly occurs greatest abundance phlogopite apatite. Evolved some lamproites may have no detectable F. With increasing evolution lamproites, tends to decrease whole rocks, amphibole glass. also shows a variety relationships BaO Based on plots F/(F + OH) apatite is variable hence determination partition coefficients not possible. patterns affected by lack mutual equilibrium F-bearing phases, possible removal fluid phase during magma degassing, variations physical conditions crystallization magma, other causes. This study suggests that preferentially enters solid rather than liquid phases. Hence, partial melting F-rich mantle source, entering melts unlikely be sufficient produce high