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- W2019127904 abstract "Abstract The Kuznetsk Basin volcanic rocks are close in age (from 252.3 ± 0.6 to 246.2 ± 1.4 Ma) to the traps of the West Siberian Plate and Siberian craton, which formed as a result of the Permo-Triassic plume activity. The geologic and petrographic features evidence that the andesitic basalts exposed in the Karakan and Elbak quarries are effusive rocks; most of them are andesitic basalts, and the rest are trachyandesitic basalts. The mineral composition is as follows: olivine Fo59–66, plagioclase An47–60, and clinopyroxene En47–42Fs25–12Wo42–33; Mg# = 82–63. Using the COMAGMAT 3.5 program, the magma crystallization conditions during the andesitic-basalt formation were determined: 1109–1105 ºC, buffer QFM-NNO. The studied rocks are enriched in LREE ((La/Yb)ch = 4.7–7.5) and are depleted in HREE ((Sm/Yb)ch = 2.0–2.8). A specific geochemical feature of the rocks is strong Nb, Ta, Ti, and Eu negative anomalies ((La/Nb)PM = 4.5–1.6, (La/Ta)PM = 3.2–2.0, Eu/Eu* = 0.7) and a positive U anomaly on their normalized element patterns; ɛNd(T) varies from +2.3 to +3.1. The HREE depletion of the Kuznetsk Basin volcanic rock points to the presence of garnet in the mantle source during their generation. The low Mg# indicates that the parental melts are not of the primary-mantle genesis but are probably the product of differentiation in deep-seated intermediate magma chambers." @default.
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- W2019127904 date "2012-04-01" @default.
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- W2019127904 title "Petrological and mineralogical features of volcanic rocks from the central Kuznetsk Basin (<i>southern Siberia</i>)" @default.
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- W2019127904 doi "https://doi.org/10.1016/j.rgg.2012.02.010" @default.
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