Effect of Crystallization of Accessory Apatite on Composition of Plagioclase in Leucogranites of the Northern Ladoga Region

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Resumo

Leucogranites are characterized by low Ca content and, as a consequence, the presence of only essentially sodium plagioclase, usually not higher than andesine composition. Using a number of intrusions of two-feldspar leucogranites in the Northern Ladoga region as an example, it was shown that the different compositions of plagioclase in them can be explained not by the initially different contents of the main oxides in magmas, or by special P–T conditions of crystallization, but by variations in the amount of crystallized apatite, which determined the different degree of fractionation of Ca from the melt. These observations are confirmed by thermodynamic modeling, which showed the emerging "deficit" of Ca in the magma and a decrease in the content of the anorthite molecule in plagioclase during joint crystallization with apatite or after it. It is shown that the crystallization of apatite from low-calcium magmas, even in accessory quantities (1—3%), can lead to a change in the composition of plagioclase in the rock by 10—30 mol. % of An.

Sobre autores

Sh. Baltybaev

Institute of Precambrian Geology and Geochronology RAS; Saint-Petersburg State University — Institute of Earth Sciences

Email: shauket@mail.ru
Saint Petersburg, Russia

M. Petrakova

Geological Institute RAS

Email: shauket@mail.ru
Moscow, Russia

O. Galankina

Institute of Precambrian Geology and Geochronology RAS

Autor responsável pela correspondência
Email: shauket@mail.ru
Saint Petersburg, Russia

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