Vs. Popov et al., Multiple gabbro-granite intrusive series of the Syrostan pluton, southern Urals: Geochemistry and petrology, GEOCHEM INT, 39(8), 2001, pp. 732-747
The Syrostan gabbro-granite pluton is situated immediately to the west of t
he Main Uralian Fault and exemplifies a multiple series of five intrusive r
hythms. Each rhythm characterizes a separate episode of emplacement of basi
c and acid magmas, which ascended from mantle and crustal sources contempor
aneously, partly mixed with each other, and solidified in a sequence from b
asic to acid rocks according to decreasing solidus temperature. This model
is confirmed by geochemical data demonstrating the specific fractionation t
rends for basic and acid magmas and the field of intermediate compositions
typical of hybrid rocks. Experimental data on late-magmatic epidote stabili
ty and the plagioclase-amphibole thermobarometer were used to estimate the
PT conditions of magma crystallization. The results obtained indicate the d
ecrease in depth of magma solidification from early to late intrusive rhyth
ms due to the rise of the magmatic column and the rapid denudation of the o
verlying rocks.