Академическое издательство «Гео»

Keywords: barrier zone, bottom sediments, mineral composition, Angara river.



GEOGRAPHY AND NATURAL RESOURCES, 2012, № 1, p. 151-155

The peculiarities of mineral composition of bottom sediments in the barrier zone of the Angara river

G.A. Karnaukhova and T.M. Skovitina

karnauh@crust.irk.ru, skovit@crust.irk.ru

Results from many years of investigations have shown that the regulation conditions of the Angara river discharge give rise to a barrier zone which develops an intense differentiation of sediments not only in particle-size composition but also in mineral composition. The differentiation is due to the dynamical features of environment and, primarily, to the dramatically changing velocity regime of the water flow. According to the mineralogical composition of heavy fraction of bottom sediments, we identified the amphibole-ore, ore-garnet and amphibole-epidote subprovinces.

Keywords: barrier zone, bottom sediments, mineral composition, Angara river.
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