metasomatism

It is produced by dynamo thermal metamorphism and metasomatism, which occur in the zones where tectonic plates are subducted, changing rocks by heat and pressure, with influx of fluids but without melting.

Gresens, R.L.: 1967, Composition-volume relationships of metasomatism. Chemical Geology, 2, 47-55.

In many geological processes, Y/Ho, Zr/Hf, and Nb/Ta ratios are stable in one hydrothermal system; however, when the system is disturbed by hydrothermal activities or metasomatism, these element pairs will change significantly, and are presented as a large variation range among different samples (Bau et al., 1995; Yaxley et al., 1998).

It was corroborated by the study of Pirajno [25] who found that the hydrothermal alteration might generate argillic and result in the formation of clay minerals because of the increase in [H.sup.+] activities during the alteration sequence of the metasomatism process in which the mineral exchange occurred between the altered rocks and the ions carried by water [26].

Since crystals record changes occurring in the environment in which they grow (e.g., [7,11-15]), isotopic investigations at grain and subgrain scales on rock-forming minerals provide information on mineral-whole rock equilibria that constrain the magmatic processes occurring during magma evolution (e.g., mixing, mingling, crystals recycling, crustal contamination, or metasomatism).

The rocks of Gabal El-Rubshi are highly susceptible to alteration into talc carbonate rocks as a result of CO2 metasomatism [6].

(https://www.sciencedirect.com/science/article/pii/S0012821X17300341) The study , published in the latest edition of the journal Earth and Planetary Science Letters, calls this mechanism of deposition of silicate minerals "aerial metasomatism."

Tang, "Iron isotope variations in spinel peridotite xenoliths from North China Craton: Implications for mantle metasomatism," Contributions to Mineralogy and Petrology, vol.

Unraveling the effects of potassium metasomatism in sedimentary rocks and paleosols, with implications for paleo weathering conditions and provenance.