Inclusion Suites — Macrocrysts, Xenocrysts, Xenoliths, etc.

Abstract

The spectrum between truly cognate and wholly foreign inclusions was explained in the introduction to Chapter 4. Here we deal with inclusions which are largely foreign (Types B-F). Table 6.1 explains the fairly standard nomenclature used. Inclusions characteristically constitute tens of percent of the volume of individual lamprophyre dykes, and locally reach 70–80% (e.g. Reynolds 1936; Ayres & Higgins 1939; Elders 1957). They can be concentrated in the central portions of dykes and sills via flow differentiation (Section 3.1).