Ancient volcanic glasses of the Urals     

V. G. Korinevskii 《Journal of Volcanology and Seismology》2011,5(1):31-42

The existing data on findings of unaltered volcanic glasses in the Paleozoic (from Late Ordovician to Late Devonian inclusive) volcanic strata of the Ural fold belt are systematized. These glasses have compositions that correspond to tholeiitic basalts, potassic alkaline basaltoids, andesites, and rhyolites. Relic portions of glasses of cenotypal appearance are preserved in thick glassy crusts of pillow lava flows, in fragments among hyaloclastites, in bombs from tuffs, and in extrusive bodies and dykes. Chemical analysis showed that the amount of dissolved water was low (1–1.3 wt %) in the primary tholeiitic magma and higher (8–10 wt %) in the magma that formed island-arc hyalobasalts, potassic alkaline basaltoids, andesites and rhyolites.  相似文献   

Silurian Black Smoker Deposits in the Urals     

Korinevskii  V. G.  Korinevskii  E. V. 《Geology of Ore Deposits》2022,64(4):180-201

Geology of Ore Deposits - The geological position and mineral composition of specific troilite–quartz rocks (klyuchevites) are considered. They form separate interbeds among deep-water...  相似文献