The dolerite has been carbonated as metasomatic selvages into veins and joints and other flaws to produce'White Whin '.
12.
Advanced carbonation of felsic and mafic rocks, very rarely, creates fenite, a metasomatic alteration caused particularly by carbonatite intrusions.
13.
Alkalies were already linked with feldspars and feldspathoids both in alkali syenites and in metasomatic fenites to be contained by residual carbonate.
14.
The dominant green epidote in unakite rocks is the metasomatic alteration product of plagioclase feldspar, while the orthoclase and quartz crystals remain unaffected.
15.
This re-deposited silica forms veins and patches of indefinite shape or may bodily replace a considerable area of the rock by metasomatic substitution.
16.
He especially questions the purely magmatic approach to granite genesis and shows in his research the importance of metasomatic replacements, in some places on a very large regional scale.
17.
The occasional appearance of myrmekite ( mainly in the microgranites ) and the hematitization of the plagioclase in the aplites and in the red facies rocks points to metasomatic processes.
18.
These veins are the product of intrusive hydrothermal fluids and metasomatic fluid interaction followed by deposition in fractures that formed as a result of the tectonic activity in the belt.
19.
Modal metasomatism may result in formation of amphibole and phlogopite, and the presence of these minerals in peridotite xenoliths has been considered strong evidence of metasomatic processes in the mantle.
20.
The deformations were therefore more or less continuous and had not only affected the shear zone but also the older plutonic country rocks, thence bringing about a metasomatic change in mineralogy.
