... — — — — Ranges of minimum and maximum T estimates 528–604 487–623 627–658 629–668 638–652 650–672 Fig. 2. Mineral equilibria characterizing P - T conditions of the formation of the Tongulak metamorphic zoning. 1 — triple point and boundaries of stability fields of Al 2 SiO 5 [ 10 ]; 2...

... boundary of the Tongulak series is not always distinct. Usually, there are gradual transitions between the gneisses of the Tongulak series and the schists of the Il’dugem series in the range of up to several tens of meters. Rodygin (1968) reported signs of a structural discordance between the Il’dugem...

.... , 2003 . Metamorphic zoning of the Tongulak mountain range, Altai: mathematical modeling. Geologiya i Geofizika (Russian Geology and Geophysics) 44 ( 4 ), 297 – 304 (285–294). Bhatia , M.R. , Crook , K.A.W. , 1986 . Trace element characteristics...

... axes, respectively ( Fig. 1 ). The basin is surrounded by mountains. In the north, it is the Kubadru neotectonic uplift, with its highest summit (Verkhovie Ortolyka) at 3446 m asl. In the northeast there are the en-echelon Kurai and Tongulak Ranges, both being the highest (up to 3200 m) parts...

... lamproites, whose TiO 2 contents are similar or still lower as compared with the studied rocks. The K 2 O/Al 2 O 3 ratio in most of the samples is within ~0.7–1.0 and does not fall below 0.6, the lower limiting value for the lamproites with this range of SiO 2 contents ( Foley et al., 1987 ). Fig. 1...

...Taras A. BUL'BAK; Gennady Yu. SHVEDENKOV Abstract Experiments on cordierite saturation with “dry” methane, ammonia and the components of H 2 O-CH 4 and H 2 O-NH 3 binary mixtures were performed at 50, 150, 200 MPa in the temperature range from 400 to 800°C to examine the possibility of using Mg...

... temperature range of their stability at low-pressure thermal metamorphism [ 17 ]. Droop and Harte [ 18 ] reported only three findings of the Cld + Bt + And paragenesis in contact aureoles: Tono, Japan [ 19 ], Karatash, Russia [ 20 ], and Insh, Scotland [ 21 ]. The rare Crd + Grt + Ms paragenesis is also...

..., and the paleomagnetic data and palinspastic reconstructions confirm the common evolution of the Paleoasian ocean in the range of 950–250 Ma. The large stages of reconstruction and closure of the Paleoasian ocean are involved with superplumes, which appeared in the Permian-Triassic (Siberian), in the Devonian (European...