View source for Late-tectonic granitoid intrusions, Caledonian magmatism, Grampian Highlands

== (iii) North-eastern diorites to granites  ==
The members of this suite range from diorite to granodiorite, are in some cases foliated, and are highly xenolithic, with the more acid members carrying xenoliths of the more basic phases.

The '''''Kennethmont Complex''''' (53<nowiki>;</nowiki> Sadashivaiah, 1954; Read and Haq, 1965; Busrewil et al., 1975) was emplaced at the western end of the Insch basic mass and ranges from diorite to granite in composition. A Rb/Sr whole rock isochron of 453 ± 3 Ma and initial Sr isotope ratio of 0.7145 (Pankhurst, 1974) were obtained from the pink granite of the complex, which Busrewil et al. (1975) have suggested is a later, unrelated post-tectonic intrusion cutting the diorite and the xenolithic grey granite. The Kennethmont diorites were originally considered (Sadashivaiah, 1954) to be hybrids resulting from contamination of granitic magma by assimilation of gabbroic material from the Insch mass. However, Busrewil et al. (1975) regard the diorite as representing the primary Kennethmont magma, with the grey granite being a differentiate of it.

The '''''Syllavethy''''' intrusion (54<nowiki>;</nowiki> Gould, 1997) varies from a foliated, xenolithic quartz-diorite to an unfoliated grey granodiorite. The '''''Tillyfourie Tonalite '''''(55<nowiki>;</nowiki> Harrison, 1987) consists of tonalite with minor granodiorite'' ''showing a marked foliation. Both are associated with an extensive tonalite–granodiorite vein complex in the area between them. No age data are available for either intrusion or for the vein complex, but the Tillyfourie Intrusion and the vein complex are cut by the late-tectonic Corrennie granite and the post-tectonic Crathes, Balblair and Bennachie granites, and the group is provisionally assigned to the late-tectonic suite. The small '''''Corrennie Granite''' ''(84), which forms an elongate body of pink, leucocratic granite with a foliation defined by the streaking out of quartz crystals, cuts the Tillyfourie intrusion.

'''Seven-fold division of the Caledonian Igneous Suite'''

:: [[Pre-tectonic basic magmatism, Caledonian magmatism, Grampian Highlands|Pre-tectonic basic magmatism]]

:: [[Syntectonic granitic intrusions, Caledonian magmatism, Grampian Highlands|Syntectonic granitic intrusions]]

:: [[Syn- to late-tectonic basic and ultramafic intrusions, Caledonian magmatism, Grampian Highlands|Syn- to late-tectonic basic and ultramafic intrusions]]

:: [[Late-tectonic granitoid intrusions, Caledonian magmatism, Grampian Highlands|Late-tectonic granitoid intrusions]]

:: [[Post-tectonic granitoid intrusions, Caledonian magmatism, Grampian Highlands|Post-tectonic granitoid intrusions]]

:: [[Late- to post-tectonic minor intrusions, Caledonian magmatism, Grampian Highlands|Late- to post-tectonic minor intrusions]]

:: [[Lower Old Red Sandstone volcanism, Caledonian magmatism, Grampian Highlands|Lower Old Red Sandstone volcanism]]