Discussion
Crystallization of new phlogopite mineral in the existing mantle peridotite is an example of which of the following process ?
Answer: B
The growth of new phlogopite is patent metasomatism.
Mantle metasomatism is divided by whether new minerals appear. In patent (modal) metasomatism, fluids or melts introduce new phases, such as phlogopite, amphibole, apatite or ilmenite, into the peridotite. In cryptic metasomatism the chemistry of the existing minerals changes (for example their trace element contents) but no new mineral grows.
Since phlogopite is a new mineral, the process is not cryptic. Sulphide metasomatism concerns sulphide phases, and mantle depletion is the extraction of melt, the opposite of adding phlogopite-forming components.
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