Mafic microgranular enclaves provide significant information on the nature of source rocks, the genesis of granitic magma (Pin et al.
The parental granitic magma underwent the mixing of mantle-derived mafic magma and crustal felsic magma, coupled with fractional crystallization during magma ascent before emplacement.
The generation, segregation, ascent and emplacement of granitic magma
: The migmatite-to-crustally-derived granite connection in thickened orogens // Earth Sci.
This indicates more dynamic conditions during crystallization than previously thought for granitic magma
chambers, and represents an important mechanism for crystal-melt fractionation.
All these effects must be carefully evaluated before a conclusive determination of D for a metal during evolution of a granitic magma
system as described here can be achieved.
Geochemical compositions of granitic magmas
without remarkable fractional crystallization can reflect the source rock characteristics of the magma.
Topics include: Plutonism versus Neptunism, the sanukitoid series, the geochemistry of Archaean plagioclase-rich granites as a marker of source enrichment and depth of melting, chemical structure in granitic magmas
, and more.
Sisson, T.W., Ratajeski,K., Hankins,W.B., and Glazner, A.F., 2005, Voluminous granitic magmas
from common basaltic sources: Contributions to Mineralogy and Petrology, v.
This variation is consistent with the saturation behaviour of zircon in crystallizing granitic magmas
(Hanchar and Watson 2004), and the decreasing REE contents noted above.
Clemens, J.D., 1998, Observations on the origins and ascent mechanisms of granitic magmas
: Journal of the Geological Society, London, v.
They described evidence of magma mingling, and concluded that the gabbroic, dioritic, and granitic magmas
that formed these plutons were coeval.
The generation of granitic magmas
by intrusion of basalt into continental crust.