Russian Journal of Earth Sciences
Vol. 4, No. 6, December 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
Abstract
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.