Co-existing mafic and felsic magmas in the early Proterozoic rapakivi granite suite of Southern Greenland

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Abstract
The early Proterozoic rapakivi granites of Southern Greenland often contain synplutonic mafic intrusions in the form of dyke complexes or plug-like bodies. They often display crenulate chilled contacts with their host and the two have not mixed to any degree. This lack of mixing can be attributed to strong viscosity, temperature and density contrasts between the two magma types, despite their similar mass fractions. During the emplacement of the mafic intrusions the host magma had a crystal content greater than 60% and consequently convective mixing was negligible.

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