Mineral and geochemical characteristics, composition of initial melt, and parameters of crystallization for Dzhigda gabbroids (south-eastern framing of the Siberian craton)

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Abstract

Dzhigda gabbroid massif is a typical representative of the Permo-Triassic ultramafic-mafic intrusions in the south-eastern framing of the Siberian Сraton. The article presents results of calculations of the composition and crystallization parameters of the melt that produced the gabbroids. It is has shown that crystallization of the melt occurred at the pressure of 4—6 kbar and initial temperature of 1125—1160 °С. Fractionation of the melt led to the formation of gabbro and gabbrodiorites, on the one hand, and to the formation of gabbro and gabbro-diorites enriched with sodium, on the other hand. Analysis of available data shows that the compositions of the initial melt and crystallization parameters for Permo-Triassic ultramafic-mafic intrusions in the south-eastern framing of the Siberian Craton are significantly differ. Perhaps this is a characteristic of this stage of magmatism. In addition, rocks from these intrusions have obvious features of geochemical duality, which is a combination of signature as intraplate and suprasubduction origin.

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About the authors

A. A. Rodionov

Institute of Geology and Nature Management, Far Eastern Branch RAS

Author for correspondence.
Email: scream_amsu@mail.ru
Russian Federation, Blagoveshchensk

I. V. Buchko

Institute of Geology and Nature Management, Far Eastern Branch RAS

Email: scream_amsu@mail.ru
Russian Federation, Blagoveshchensk

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2. Fig. 1. Tectonic scheme for the southeastern framing of the Siberian Craton and schematic geological map of the Dzhigda intrusive, compiled according to (Parfenov et al., 2003; Seryozhnikov, Volkova, 2007; Agafonenko et al., 2007; Petruk, Kozlov, 2009).

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3. Fig. 2. Variation diagrams for rocks of the Dzhigda intrusive (1 — gabbro, gabbro-diorites; 2 — gabbro, gabbro-diorites enriched with sodium; 3 — average compositions).

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4. Fig. 3. Differentiation trends for the melt proposed to be parental to the Dzhigda intrusive calculated with Petrolog (Danyushevsky, 2001) at pressure of 2, 4, and 6 kbar.

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5. Fig. 4. Variation diagrams with differentiation trends for the melt proposed to be parental to the Dzhigda intrusive at pressure of 2, 4, and 6 kbar.

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