Infiltration metasomatism in layered intrusions revisited: a reinterpretation of compositional reversals at the base of cyclic units |
| |
Authors: | R M Latypov S Yu Chistyakova T T Alapieti |
| |
Institution: | (1) Kola Science Centre, Geological Institute, Apatity, Russia;(2) Department of Geosciences, University of Oulu, Oulu, Finland |
| |
Abstract: | Summary
Irvine (1980) proposed an elegant mechanism termed “infiltration metasomatism” to explain upward displacement of discontinuities
in mineral compositional trends relative to contacts between cyclic units in the Muskox intrusion. It was concluded that the
offsets of Mg/(Mg + Fe) discontinuities in olivine and chromite are a secondary postmagmatic feature that resulted from reaction
between the cumulus minerals and intercumulus liquid that was frontally displaced upwards from the underlying crystal pile
as a result of compaction. We reinterpret this feature in the Muskox and other layered intrusions as basal reversals that
arise from a temperature gradient-driven flux of low melting point components from the hot magma parental to cyclic units
towards a relatively cold cumulate floor. In this interpretation basal reversals are a primary magmatic feature that does
not involve intercumulus liquid migration.
Authors’ addresses: R. M. Latypov, S. Yu. Chistyakova, Kola Science Centre, Geological Institute, Fersman Str. 16, 184200, Apatity, Russia; Present address: Department of Geosciences,
University of Oulu, Oulu, P.O. Box 3000, FIN-90014, Finland; T. T. Alapieti, Department of Geosciences, University of Oulu, Oulu, P.O. Box 3000, FIN-90014, Finland |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|