Ukrainian Antarctic journal

No 15 (2016): Ukrainian Antarctic Journal
Articles

Basalt-rhyolitic series of Galindez and Uruguay Islands (Antarctic Peninsula, Western Antarctica) as an object for geochemical modeling

A. G. Aleksieienko
Taras Shevchenko National University of Kyiv Institute of Geology, Kyiv, Ukraine
S. E. Shnyukov
Taras Shevchenko National University of Kyiv Institute of Geology, Kyiv, Ukraine
I. I. Lazareva
Taras Shevchenko National University of Kyiv Institute of Geology, Kyiv, Ukraine
L. I. Gavryliv
Taras Shevchenko National University of Kyiv Institute of Geology, Kyiv, Ukraine
Published January 18, 2017

Abstract

This paper presents preliminary results of all stages of geochemical modeling of the evolution of the Galindez and Uruguay Islands (Antarctic Peninsula, West Antarctica) eruptive magmatism, characterizes the difficulties encountered and ways to overcome them. On the basis of the developed model the article attempts to assess the temperature, pressure and fluid modes of magmatic system during its evolution, as well as its ore-generating ability. The following was discovered: close conformity of the current magmatic system evolution to the accepted fractional crystallization model; temperature mode (-1130 ... ~ 880 °С) and depth (9-12 km, lithostatic pressure 3-4 kbar) of magmatic chamber functioning; water content in initial and residual melts during all system evolution phases; mass fraction of liquid phase in system at the moment of fluid segregation (f = 0,27) and its temperature (T = ~880 °С). However, the results should only be considered preliminary. The development of more accurate models requires a significant improvement of the initial geochemical data quality.

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