0001 versus Nb/Y diagram (Winchester and Floyd, 1977), which uses only relatively for immobile elements, the studied volcanic rocks plot in the fields of basalt, andesite, trachyandesite
It can be grouped broadly into the following phases: 1) basalt, trachyte, rhyolite and minor welded tuff are present as extrusive phase, 2) granites and gabbro with marginal facies variation as intrusive phase, 3) trachyandesite
, trachydacite, rhyolite and microgranite as dyke phase.
Subalkaline basalts to basaltic trachyandesite
(Ulrych et al.
5 wt %) trachyandesite
that occurs in continental rift, collisional and arc settings (Rogers and Setterfield 1994).
Six of the eight units consist of alkaline olivine basalt, while the other two are basaltic trachyandesite
Mineralogical, petrological and geochemical investigations were carried out on an only poorly known lava flow of zeolite-bearing trachyandesite
exposed in a deep valley of the Dobrnsky potok Creek (NE of Decin-Bfeziny).
The Sikhote Alin complex consists of small potassium-alkali-rich intrusions (shonkinite, essexite-diabase, trachyandesite
, leucitic trachyte) with high boron and titanium content.
According to the conducted studies, the following volcanic rocks have been observed in this belt: basalt, basaltic andesite, andesite, trachyte, latite, trachyandesite
, dacite and rhyodacite ignimbrite and acidic to intermediate tuffs.
2005) have identified trachyandesite
to alkaline rhyolitic ignimbrites, pyroclastic surge, block and ash flow deposits and volcaniclastic deposits, mapped as NgQv and related to Plio-Pleistocene, highly explosive volcanism.