Metastable paragenetic sequence of andalusite, kyanite, and sillimanite, Kwoiek area, British Columbia

Publisher Website
Google Scholar
Abstract
A model involving initial metastable crystallization of andalusite in a contact metamorphic terrane near the Coast Range batholith is proposed to explain a constant lithostatic pressure, increasing temperature observed sequence. Texturally, fibrolite occurs as a phase distinct from sillimanite and at a lower temperature than the first appearance of sillimanite. Evidence for the metastable origin of the andalusite comes from: polymorphs distribution, textural relations in coexisting polymorphs, and a comparison of the transition sequence andalusite to kyanite to sillimanite with a second one, presumed to be contemporaneous, involving only andalusite and fibrolite. Comparison of the observed field data with experimentally determined stability fields of staurolite and aluminum silicates suggest that the prevailing pressures of the Coast Range batholith were between 5.5 and 7.1 kb.

This publication has 0 references indexed in Scilit: