In cryptic metasomatism, mineral compositions are changed, or introduced elements are concentrated on grain boundaries and the peridotite mineralogy appears unchanged.
22.
Finally acid metasomatism ( enrichment of acid components and depletion of alkalis ) took place leading to the formation of greisen and tourmalines.
23.
Cryptic metasomatism may be caused as rising or percolating melts interact with surrounding peridotite, and compositions of both melts and peridotite are changed.
24.
The source region is often largely chemically unaffected compared to the highly hydrated, altered shear zones, but both must have undergone complementary metasomatism.
25.
The first phase recognised is alkali metasomatism ( where alkaline components are enhanced ), which occurred within and at the margins of the granite.
26.
The word metasomatose can also be used as a name for specific varieties of metasomatism ( for example " Na-metasomatose " ).
27.
L . G . Collins supports a metsaomatic subsolidus growth ( potassium-and silica-metasomatism ) that has been initiated by ongoing tectonic cataclasis.
28.
Where the sills have intruded siliceous dolomites in the Bass Formation, metasomatism and recrystallization have produced chrysotile asbestos, both above and below the sills.
29.
Metasomatism is thought to be particularly important in changing the composition of mantle peridotite below island arcs as water is driven out of ocean lithosphere during subduction.
30.
There is also a tendency for metasomatism between the igneous magma and sedimentary country rock, whereby the chemicals in each are exchanged or introduced into the other.
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