EXPERIMENTAL STUDY OF THE INTERACTION OF GRANITE WITH H2O-1M HCl FLUID UNDER THE CONDITIONS OF A GRADIENT OF P-T PARAMETERS

Авторы: Khodorevskaya L.I., Varlamov D.A.
Журнал: Experiment in GeoSciences
Том: 28
Номер: 1
Год издания: 2022
Первая страница: 158
Последняя страница: 161
Номер статьи: UDC: 123.456
Аннотация: Experiments on the removal of Si, Al, K and Na from granitic glass Gl and their reprecipitation on amphibolite, which provoked the formation of granitic glass Gl1, were reconstructed at Т=750оС and Р=500 MPa at a temperature and pressure gradient inside an capsule. Part of dissolved constituents remained in solution and precipitated upon quenching as fine globules of quenching melt Gl2. The fluids involved in oxide transport consisted of H2O and 1m HCl. It has been shown that upon granite - H2O fluid interaction under gradient conditions more Si than Al and more sodium than potassium is removed from granite. As a result, the agpaitic crystallization series of granitic melts increases. Elements removed from granite can form syngenetic plagiogranite or quartz veins. Upon interaction of granite with acidified solutions (1 m HCl) under Т-Р gradient conditions the edge parts of the granite will shift towards the leucogranite due to the removal of alkaline elements. Syngenetic metasomatic changes will be expressed in the formation of potassium-containing minerals, such as potassium feldspar, biotite, muscovite.
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