Abstract

The appearance of magmatic rocks on the surface or near it is the result of a certain chain of processes, a list of which might look like the following: (a) a partial or complete melting of the upper mantle and the formation of a primary magmatic emulsion; (b) rise of the primary magmatic emulsion; (c) isolation of basaltic asthenoliths; (d) rising of asthenoliths; (e) a change in composition of the primary magma as a result of differentiation, assimilation and contamination; (f) heating of the crust, regional metamorphism, melting of rocks of the crust, gneissification and granitization.

This paper aims to give a brief survey of the probable nature of the processes mentioned above from the viewpoint of the tectonic environment in which they occur. This is the view of a tectonist concerning magmatism. The survey is confined to the continents.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not currently have access to this article.