leucogranite

The leucogranite crops out in the upper reaches of the Dronne valley.

An unnamed coarse leucogranite has a small out crop east of Jerrabomberra creek.

The first kind of granite is subdivided into granodiorites and muscovite-biotite leucogranite.

The Saint-Mathieu leucogranite is younger, its coarse-grained facies was dated at 304 million years.

As mentioned above the western branch of serpentinites lies spatially close to the Chéronnac Leucogranite.

They were intruded during the Pennsylvanian by the Saint-Mathieu Leucogranite.

Together with the leucogranite the granodiorite forms a domal swell in the basement the Saint-Mathieu Dome.

The upper part of the leucogranite batholith is associated with massive quartz greisen and veins within the hornfels and shale.

The leucogranite magmas are interpreted to have been derived by melting of pelitic rocks in the upper portions of thickened crust.

Strontium isotope ratios of the leucogranite intrusives are distinct from that of the gneiss and associated leucosomes.

These leucogranites are part of a belt of Late Oligocene-Miocene intrusive rocks known as the Higher Himalayan leucogranite.

This leucogranite intrudes Clear Range Granodiorite and Shannons Flat Granodiorite.

The two toned appearance of the mountain's eastern face is created by a roof pendant of darker colored granodiorite atop a lighter colored body of leucogranite.

Examples for this structure are found in California in the Rubidoux Mountain leucogranite and in granodiorites in the Sierra Nevada.

These outcrops are spatially very close to the northern edge of the Chéronnac Leucogranite, a Pennsylvanian leucogranite with a very pronounced, east-west-striking foliation.

Booroomba Leucogranite Booroomba Leucogranite is found at Mount Tennant and Booroomba Rocks.

The rocks of Annonay consist of mostly grey or light orange leucogranite and orthogneiss rich in biotite, sillimanite and cordierite with alternating bands of felsic and mafic material.

The southern branch overlies the leptynitic augengneisses, which in turn are thrust over the mica schists of the Parautochthonous Micaschist Unit (PMU) or the Saint-Mathieu Leucogranite.

However, renewed high temperatures are indicated by Superior-wide leucogranite plutonism and metamorphism (2.66-2.64 Ga), as well as regional deep crustal metamorphism and ductile, orogen-parallel flow, correlated with ubiquitous subhorizontal reflectivity.

This indicates the leucogranite melts were not derived from the local gneiss, however the gneiss is isotopically variable and the leucogranite could have derived from subjacent gneiss.

Parautochthonous Micaschist Unit (PMU), bounded to the West by the intrusive Saint-Mathieu Leucogranite (SML) and to the North by the Chéronnac Leucogranite.

The Piégut-Pluviers Granodiorite is surrounded in the north, northeast and east by the Saint-Mathieu Leucogranite and its eqivalents (unit 17 on the geological map), which has a slightly younger age of 315 17 million years BP (Pennsylvanian, Bashkirian).

A direct tectonical cause of the structure caused by horsing thrust units during mediovariscan tectogenesis (continental collision 400 to 360 million years BP in the Limousin can be ruled out as the Saint-Mathieu leucogranite intruded well above the thrust plane and also sent many small apophyses into the augengneisses.