Alteration Types In Granitic Rocks. Present study aims to understand the nature of. They have two different origins. This alteration grades into the potassic type by increasing amounts of k ak k feldspar and or biotite and into the argillic type by increasing amounts of h ah clay minerals.
These areas were differentiated in. About 10 types are being named as under though numerous permutations and combinations often tend to produce mixed variables.
Wyns crystalline rocks or hard rocks are rocks that are generally ancient formed at great depth at several tens of kilometres.
This alteration grades into the potassic type by increasing amounts of k ak k feldspar and or biotite and into the argillic type by increasing amounts of h ah clay minerals. It corresponds to the outcropping of the lower part of the fractured horizon of an alteration profile. Phyllic alteration is associated with porphyry cu deposits but also with mesothermal precious metal ores and volcanogenic massive sulfide deposits in felsic rocks. Hydrothermal alteration and related solid and aqueous phase geochemical signatures by dana j.
