On the contribution of basic and ultrabasic rocks in the...

RUSSIAN JOURNAL OF EARTH SCIENCES VOL. 4, NO. 6, PAGES 453–462, doi:10.2205/2002ES000113, 2002

On the contribution of basic and ultrabasic rocks in the accumulation of the products of volcanic and hydrothermal activity in the Balygychan-Sugoi Trough (NE Russia)

L. G. Filimonova, and A. V. Chugaev

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, Moscow, Russia

Abstract

[1] The data available on the crustal structure of the Balygychan-Sugoi Trough and the mineralogy and geochemistry of the Mesozoic and Cenozoic gabbro, acid volcanics, and post-magmatic minerals of the Dukat Au-Ag ore field, Sn-Ag occurrences, and zones of dispersed multimetal mineralization are used to show the great role of basic magma material in the shaping of their chemical composition. The data reported here for the Sr isotopic compositions of the contrasting volcanic rocks and the post-magmatic minerals of the ore-bearing areas and for the mineral compositions of mafic and ultramafic inclusions in the acid volcanics suggest a connection between the successive periods of endogenic activity in the region and mantle convection and the belonging of the resulting products to a mantle-plume rock association.

Received 15 December 2002; published 19 December 2002.

Keywords: basic and ultrabasic rocks, volcanic and hydrothermal activity, Balygychan--Sugoi Trough.

Citation: Filimonova, L. G., and A. V. Chugaev (2002), On the contribution of basic and ultrabasic rocks in the accumulation of the products of volcanic and hydrothermal activity in the Balygychan-Sugoi Trough (NE Russia), Russ. J. Earth Sci., 4, No.6, 453-462, doi:10.2205/2002ES000113.