Pressure estimation of spinel peridotite xenoliths, the status quo, problems, resolutions:

Towards a bertter understanding of the lithosphere-asthenosphere boundary region

Abstract

This paper critically reviews pressure estimation methods for spinel peridotite xenoliths that are frequently included in Phanerozoic alkali basalts. Geobarometries used for pressure ranges in the stability field of spinel peridotites are critically examined and problems clarified. A guide to the solutions to these problems and methods for improving the reliability and accuracy of geobarometers for spinel peridotites are presented. Methods for the validation of estimated pressures are proposed, based on estimates of the time taken for the transport of xenoliths from depth to the surface.