neosome

neosome

[′nē·ə‚sōm]
(geology)
A geometric element of a composite rock or mineral deposit, appearing to be younger than the main rock mass.
References in periodicals archive ?
The crystalline rocks within the DPDZ are granulites, biotite granites and migmatites, the latter consisting of amphibole-plagioclase palaeo- and mesosomes, and plagioclase-quartz-biotite[+ or -]microcline[+ or -]amphibole neosomes.