Results 41 to 50 of about 151 (68)

Olivine megacrysts in alkali-basaltoid dikes of the Western Sangilen, Southeastern Tuva

Doklady Rossijskoj akademii nauk. Nauki o Zemle
Large (up to 4 cm) crystals of euhedral olivine and its intergrowths with clinopyroxene were discovered in the alkali-basaltoid dikes of the Western Sangilen, South-Eastern Tuva. The composition of olivine (Mg# 81–83, NiO 0.2–0.3 wt. %) differs sharply from the composition of olivines from mantle and gabbroid parageneses.
A. E. Izokh, V. V. Egorova, R. A. Shelepaev, Ya. Yu. Shelepov   +3 more
openaire   +1 more source

Chemical composition and species attribution of tourmalines from a rare-metal pegmatite vein with scapolite, Sangilen Upland, Tuva

Geology of Ore Deposits, 2011
Detail study of chem. compn. and regularities in isomorphic replacement in tourmalines from the scapolite-bearing rare-metal pegmatite body in basin of the Solbelder River has shown that these tourmalines are calcium ones, and their species belonging is detd. by occupation of the Y octahedral position. Compn.
Kuznetsova, L.G., Zolotarev, A.A., Frank-Kamenetskaya, O.V., Rozhdestvenskaya, I.V., Bronzova, Yu.M., Spratt, J., Ertl, Andreas   +6 more
openaire   +2 more sources

Diffusion of elements in peridotite at the contact with a pyroxene-phlogopite vein: An example of xenolith from camptonite of the Sangilen highland

Doklady Earth Sciences, 2013
138 Mantle metasomatism and partial melting are the main processes that change the composition of the lithospheric mantle. Metasomatic enrichment in mantle xenoliths and peridotite massifs is evident from the presence of newly formed, mainly hydrous miner als (modal metasomatism), as well as from enrichment of peridotitic minerals in incompatible ...
Gibsher, A., Mal'kovets, V., Kuz'min, D., Litasov, Y., Bazhan, I., Pokhilenko, N.   +5 more
openaire   +2 more sources

Age, Composition, and Geodynamic Environments for the Formation of Granites and Lithium-Rich Rare-Element Pegmatite of Khusuingol Field (Sangilen Highlands)

Doklady Earth Sciences, 2018
The composition, age, and genetic relationships of spodumene pegmatites of the Khusuingol field (South Sangilen pegmatite belt, SW Sayan), encompassing the large Tastyg lithium deposit, with granitoids of the neighboring polygenic Dzos-Khusuingol batholith have been studied.
S P Shokalsky, L G Kuznetsova
exaly   +2 more sources

MINERAL CHEMISTRY AS A RESULT OF MELT MIXING (exemplified by globular camptonites from the Sangilen Upland, Tuva)

Russian Geology and Geophysics, 1994
In the presence of mutually exclusive hypotheses on the formation of variolitic camptonites of Tuva (by liquid immiscibility or mixing of melts), additional material on chemical composition of rock-forming minerals is considered in detail to elucidate the correspondence of their features to one hypothesis or to the other.
L. I. Panina, L. A. Mikhaleva, S. Z. Smirnov, I. V. Motorina, L. N. Pospelova   +4 more
openaire   +1 more source

METAMORPHISM OF THE MUGUR ZONAL COMPLEX ( SANGILEN , SOUTH-EASTERN TUVA )

Russian Geology and Geophysics, 1991
Intrusion of a diorite massif into a regionally metamorphozed series results in metamorphic zonality. Isogrades of disappearance of kyanite, staurolite, muscovite, andaluzite and appearance of hypersthene have been recognized in metapelites. The regional stage of metamorphism took place at P = 6 – 8 kbar and T = 550 – 650 °C, and the contact stage ...
openaire   +1 more source

Multistage metasomatic enrichment of the lithospheric mantle beneath the Sangilen highland: Evidence from contact xenoliths from camptonite dykes

Doklady Earth Sciences, 2014
Migration of magmas though the subcontinental lithospheric mantle is one of the key processes driving in the evolution of its modal composition, and the introduction of incompatible elements into the host peridotites. Mantle metasomatism can explain a num ber of processes, from the formation of diamond to the genesis of continental and oceanic mafic ...
A. A. Gibsher, V. G. Mal’kovets, D. V. Kuz’min, N. P. Pokhilenko   +3 more
openaire   +1 more source

GEOLOGICAL POSITION, SOURCES, AND AGE OF MINGLING DIKES OF THE NORTHWESTERN MARGIN OF THE TUVA–MONGOLIAN MASSIF IN WESTERN SANGILEN, SOUTHEASTERN TUVA

Геология и геофизика
Для изучения особенностей магматизма коллизионных зон наиболее информативным является позднеколлизионный тектоно-магматический этап, с которым связан наибольший объем и разнообразие образующихся магматических ассоциаций. В данной работе гранитоидный и базитовый позднеколлизионный магматизм рассматривается на примере раннекаледонских ...
V.A. Yakovlev, I.V. Karmysheva, V.G. Vladimirov, D.V. Semenova   +3 more
openaire   +2 more sources

The age of camptonite dikes of the Agardag alkali-basalt complex (western Sangilen): results of Ar/Ar and U/Pb dating

Russian Geology and Geophysics, 2012
Abstract A camptonite dike swarm (Agardag alkali-basalt complex) in the western part of the Sangilen Upland abounds in mantle xenoliths. Mineralogical, petrographic, and petrochemical studies show that the dikes are composed of lamprophyres of two groups, basic and ultrabasic.
A.A. Gibsher, V.G. Malkovets, A.V. Travin, E.A. Belousova, V.V. Sharygin, Z. Konc   +5 more
openaire   +1 more source

U-Pb DATING AND SUBDIVISION OF PRECAMBRIAN – EARLY PALEOZOIC METAMORPHIC AND MAGMATIC COMPLEXES OF WEST SANGILEN ( Southeastern Tuva )

Russian Geology and Geophysics, 1993
Polycyclic character of geologic events which took place at Sangilen in the Late Precambrian–Early Paleozoic was revealed as a result of the investigations carried out in this region. Four cycles of tectonogenesis (1100, 1100–700, 650–530, 490–440 Ma) with their own tectonic and rock features have been recognized.
V. I. Lebedev, A. G. Vladimirov, V. A. Khalilov, A. S. Gibsher, S. A. Kargopolov, A. P. Ponomareva, A. E. Izokh, S. I. Stupakov, S. N. Rudnev   +8 more
openaire   +1 more source