TWO GENERATIONS OF CLINOPYROXENE PHENOCRYSTS IN GAUSSBERG VOLCANO LAMPROITES (E. ANTARCTICA)

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Abstract

Study of the morphological features and chemical composition of the ultra-alkaline melts from the Gaussberg volcano (East Antarctica) revealed the two generations of clinopyroxene phenocrysts. These two groups of clinopyroxenes show distinct genetical trends that could not appear during the fractional crystallization. The first group (I) consists of high magnesium (Mg# 79–92) diopside. The second group (II) consists from more ferrous clinopyroxene grains (Mg# 59–69) (“green cores”), which are usually partly resorbed and often have zonal composition. The Groupe I differs from the Group II in its higher contents of Ti, Cr, Ni and lower contents of Fe и Al. The characteristics of the natural samples were compared to the run products of the crystallization experiments with the Gaussberg ultrapotassic melt. Based on these observations, it is proposed that the Group I (magnesian) is in equilibrium with the lamproitic melts, whereas ferrous Group II may be the relicts of clinopyroxene grains formed from the different, probably earlier portions of magma. This suggests a multistage activation of melting and associated crystallization processes in the magmatic system of the Gaussberg volcano and possible heterogeneity of a magma source.

About the authors

N. A Migdisova

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Email: nat-mig@yandex.ru
Moscow, Russia

T. A Shishkina

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Moscow, Russia

A. N Koshlyakova

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Moscow, Russia

N. M Sushchevskaya

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Moscow, Russia

C. A Lorenz

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Moscow, Russia

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