Microgranitoid enclaves in granites - Globules of hybrid magma quenched in a plutonic environment

R. H. Vernon*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    468 Citations (Scopus)

    Abstract

    Microgranitoid enclaves (autoliths, cognate xenoliths, mafic inclusions) are common in high-level granitoid plutons. They have relatively fine-grained igneous (microgranitoid) microstructures1, and many show evidence of having flowed in a magmatic condition2. These features counter interpretations that the enclaves represent transformed solid fragments of diverse wall rocks3-5 or restite6-11. An alternative interpretation is that the enclaves represent globules of mafic magma that have mingled ('commingled') and quenched in the granitoid host magma12-16. A detailed review of the literature, occurrence, morphology and composition of micro-granitoid enclaves strongly supports this view, hut indicates that the enclave magmas range in composition from mafic to felsic, and that magma-mixing may be involved in their formation17. I summarize here the main features of microgranitoid enclaves and briefly outline the possible processes leading to their incorporation as magma globules in the host granitoid.

    Original languageEnglish
    Pages (from-to)438-439
    Number of pages2
    JournalNature
    Volume309
    Issue number5967
    DOIs
    Publication statusPublished - 1984

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