Chavide, Maria Tabatabaei Manesh, Seyed Mohsen Ahmadian, Jamshid
Published in
Petrology
AbstractThe Urumieh-Dokhtar Magmatic Arc (UDMA) appears as a nearly linear suite of magmatic rocks that extends from NW to SE Iran parallel with the orogenic suture of the Zagros Fold-Thrust belt. The Qazan granitoids formed along the central part of UDMA and span a wide range of felsic rocks, including granodiorite, quartz diorite, diorite, and mo...
Kosarev, A. M. Puchkov, V. N. Seravkin, I. B. Shafigullina, G. T.
Published in
Petrology
Plate-tectonic paleogeodynamic setting of volcanic massive sulfide-bearing complexes of the Magnitogorsk island-arc megazone was reonstructed based on petrological-geochemical study and available geophysical data. The correlation between La/Yb ratio, Th, Yb, TiO2, and Zr concentrations in the basalts of ore regions, and ore volumes (Cu + Zn, in kt)...
Akimova, E. Yu. Kol’tsov, A. B.
Published in
Petrology
bstractThe mineral zoning of corundum-bearing rocks of the Belomorian mobile belt, whose genesis remains controversial, has been studied at one of the typical occurrences: Khitoostrov. Based on the estimates of the P–T parameters of the formation of corundum-bearing rocks by the multiequilibrium thermobarometry method, pseudosections were construct...
Bortnikov, N. S. Silantyev, S. A. Bea, F. Montero, P. Zinger, T. F. Skolotnev, S. G. Sharkov, E. V.
Published in
Petrology
This paper synthesizes available and original U-Pb geochronological and hafnium and oxygen isotope data on zircon from gabbro and peridotites in the oceanic core complexes (OCC) of the Mid-Atlantic Ridge (MAR) extending for 2000 miles along its crest zone. We attempted to reproduce the evolution of MAR magmatism and to determine the geochemical and...
Akinin, V. V. Smirnov, V. N. Fedorov, P. I. Polzunenkov, G. O. Alekseev, D. I.
Published in
Petrology
>AbstractThe coastal northwestern part of the Sea of Okhotsk hosts local volcanic fields of olivine–two pyroxene andesites and basaltic andesites of the Kytyima volcanic complex, which were dated at about 48 ± 2 Ma (U–Pb, 40Ar/39Ar, and K-Ar methods). The age of the eruptions correlates with that of bottom sediments in the Sea of Okhotsk and may re...
Sholukhov, K. N. Prokofiev, V. Yu. Solovova, I. P. Borisovsky, S. E. Zhilicheva, O. M. Pertsev, A. N.
Published in
Petrology
AbstractThe plutonic rocks studied in the Ashadze Complex contain four groups of mineral assemblages: (I) coarse-grained gabbronorite, which is dominant; (IIa) micrograined differentiated gabbro (oxide microgabbro) enriched in ilmenite and apatite and sporadically containing zircon grains smaller than 70 µm; (IIb) local oxide microgabbro aggregates...
Buikin, A. I. Hopp, J. Verchovsky, A. B. Kogarko, L. N. Trieloff, M.
Published in
Petrology
AbstractHere we present summarizing of isotopic compositions and element ratios of noble gases, nitrogen, carbon and hydrogen in carbonatites of different generations of the Guli massif (West Siberia, Russia) obtained by stepwise crushing. The data point to the subcontinental lithospheric mantle (SCLM) as a primary source of the fluid phase in Guli...
Polyakov, V. B. Shilobreeva, S. N.
Published in
Petrology
AbstractCarbon contents and isotopic compositions were compared in the basalt groundmass of the oceanic crust of different age in the zone of the East Pacific Rise. In samples the basalt groundmass of the ancient oceanic crust (~270 Ma, ODP Site 801C) in which a carbonate phase was found, the isotopic composition of the oxidized carbon (δ13C = ±1.5...
Ariskin, A. A. Pshenitsyn, I. V. Dubinina, E. O. Kossova, S. A. Sobolev, S. N.
Published in
Petrology
AbstractHigh-precision analysis of sulfur isotope composition was carried out for sulfide fractions from ten samples of olivine gabbronorite that composes a thick (approximately 300 m) swell of a ore-bearing apophysis that is parallel to the basal part of the Yoko-Dovyren massif in northern Baikal area, Russia. The δ34S values were found out to wid...
Krylov, D. P.
Published in
Petrology
New 18O/16O β-factors have been calibrated against temperature for titanite (considering the principal isomorphic substitutions Al + F ⇔ Ti + O, Ti + O ⇔ Al + OH, Ti + O ⇔ Fe3+ + OH) and ilmenite (accounting for Fe ⇔ Mg substitution) for the first time using the frozen-phonon approach of the density functional theory. The equilibrium oxygen isotope...
