Karpinskii Russian Geological Research Institute

Saint Petersburg, Russia

Karpinskii Russian Geological Research Institute

Saint Petersburg, Russia
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Kuzmin V.K.,Karpinskii Russian Geological Research Institute | Bogomolov E.S.,Russian Academy of Sciences | Glebovitsky V.A.,Saint Petersburg State University
Doklady Earth Sciences | Year: 2017

Rocks with Paleoproterozoic Sm–Nd model ages (TNd(DM) = 2096–2350 Ma) are the sources of protoliths with gneiss, amphibolite, marble, and calciphyre of Yurovsk rise. This fact makes possible estimation of the lower age boundary of the formation of the crystalline basement of Yurovsk rise as Paleoproterozoic. According to the results of Sm–Nd, U–Pb (SHRIMP), and Pb–Pb geochronological studies, two isotope provinces are distinguished within the crystalline basement of the Okhotsk massif. The Paleoarchean province occupies the territory of Kukhtui rise, in which crust-forming processes played a key role (3250–3650 Ma). The Paleoproterozoic province includes Yurovsk rise, in which the major stages of crust formation have an age of 1900–2350 Ma. © 2017, Pleiades Publishing, Ltd.

Filatov S.K.,Saint Petersburg State University | Karpov G.A.,Institute of Volcanology and Seismology | Shablinskii A.P.,Saint Petersburg State University | Krivovichev S.V.,Saint Petersburg State University | And 2 more authors.
Doklady Earth Sciences | Year: 2016

Fine-granular (<0.1 mm) flattened colorless transparent crystals of ivsite form white aggregates. The empirical formula (Na2.793Cu0.056)2.849HS2.016O8is close to the ideal Na3H(SO4)2. The structure was refined up to R = 0.040. Ivsite has a monoclinic symmetry, P21/c, a = 8.655(1) Å, b = 9.652(1) Å, c = 9.147(1) Å, β = 108.76(1)°, V = 723.61(1) Å3, Z = 4. Na atoms occur at six- and seven-fold sites (NaO6and NaO7); S atoms, in isolated SO4tetrahedrons; these polyhedrons form a three-dimensional framework. The diagnostic lines of powder diffraction patterns (d[Å]–I–hkl) are 4.010–53–12-1, 3.949–87–012, 3.768–100–210, 3.610–21–20-2, 3.022–22–031, 2.891–42–22-2, 2.764–49–31-1, and 2.732–70–13-1. © 2016, Pleiades Publishing, Ltd.

Sakhno V.G.,Russian Academy of Sciences | Krymsky R.S.,Karpinskii Russian Geological Research Institute | Belyatsky B.V.,Karpinskii Russian Geological Research Institute | Shevchenko S.S.,Karpinskii Russian Geological Research Institute | Sergeev S.A.,Saint Petersburg State University
Doklady Earth Sciences | Year: 2015

This paper reports the results of isotope-geochemical studies and distribution patterns for trace elements and rare earth elements in a collection of specimens of Cenozoic alkaline olivine basalts and spinel lherzolite xenoliths sampled at Zhokhov Island, De Long Archipelago (New Siberian Islands), East Arctic. In spite of various contributions of xenogenic minerals of mantle lherzolite xenoliths (olivine, pyroxene and spinel), the bulk-rock isotope composition of the studied specimens deviates within insignificant limits. This evidences the isotopic and geochemical homogeneity of the mantle source and the absence of a significant effect of processes of contamination by crustal host rocks, which frequently occur within the basalts as xenoliths. On the other hand this reflects the short lifetime of existence and evolution of the mantle melt source. The studied basalts by their isotope and geochemical characteristics resemble volcanics of oceanic islands, intraplate continental volcanics, and those of ocean rises, relate to the activity of mantle plumes. The lack of elevated U/Pb in the studied specimens permits us to correlate the occurrence of the Cenozoic volcanism at De Long Islands of East Arctic with intraplate continental plume volcanism of the rifting stage (analogous to plume magmatism of the East African Rift, Mesozoic alkaline ultramafic volcanism of Eastern India, and others). © 2015, Pleiades Publishing, Ltd.

Skublov S.G.,Russian Academy of Sciences | Astaf'Ev B.Yu.,Russian Academy of Sciences | Marin Yu.B.,St. Petersburg State Mining Institute | Berezin A.V.,Russian Academy of Sciences | And 2 more authors.
Doklady Earth Sciences | Year: 2011

The repeated isotopic and geochemical study of zircons of the eclogite from Stolbikha Island (Gridino settlement area) allows one to interpret the U-Pb age value of about 2700 Ma by central parts of zircon grains as a magmatic event time, probably rejuvenated to a degree by intense manifestation of the eclogite metamorphism of about 1880 Ma age. The Svecofennian high-pressure metamorphism caused a partial recrystallization of zircons of magmatic origin and the appearance of their rims showing typical geochemical characteristics of eclogite zircons. © 2011 Pleiades Publishing, Ltd.

Alexeev N.L.,Polar Marine Geological Research Expedition | Zinger T.F.,Russian Academy of Sciences | Glebovitsky V.A.,Russian Academy of Sciences | Kapitonov I.N.,Karpinskii Russian Geological Research Institute
Doklady Earth Sciences | Year: 2010

This report presents the main results of LA-ICPMS studies of zircon from metamorphosed magmatic rocks of the Fisher Massif in East Antarctica. The minimum age of crystallization for still unexplored granitoid intrusion in the southeastern part of the massif amounts to 1399 ± 11 Ma. The presence of inherited zircon of 1786 ± 23 Ma age in the rocks points to their fusion from a crustal source of Paleoproterozoic age. The time of the eruption of vulcanites of basite composition amounts to 1244 ± 11 Ma. The vulcanites contain xenogenic zircon of Late Archean and Middle Proterozoic age; hence, their initial melt interacted with the heterogeneous continental crust. The earliest metamorphism of the amphibolite facies proceeded 1213 ± 16 Ma ago, and was accompanied with intense shift deformations. The time of volcanism complies with the age of a large basite dike swarm in Vestfold Hills, intruded about 1250 Ma ago, which is associated with the destruction of the hypothetical Paleoproterozoic Nuna (Columbia) continent. © 2010 Pleiades Publishing, Ltd.

Berzina A.P.,RAS Institute of Geology and Mineralogy | Lepekhina E.N.,Karpinskii Russian Geological Research Institute | Berzina A.N.,RAS Institute of Geology and Mineralogy | Gimon V.O.,RAS Institute of Geology and Mineralogy
Doklady Earth Sciences | Year: 2012

The Erdenetuin-Obo porphyry Cu-Mo deposit was formed at the final stage of development of magmatic activity occasionally manifested in the Late Permian-Early Triassic in the period of at least 40 Ma. Early plutonic (host) and late ore-bearing porphyry intrusive complexes were formed in that period. The plutonic complex is multiphase, while the porphyry complex is polyrhythmical and multiphase within rhythms. The obtained data on the U-Pb isotopic composition (SHRIMP II) of zircons from unaltered rocks of the ore field are discussed: gabbro, diorite, and granodiorite of the plutonic complex and granodiorite-porphyry I and II of the first and second rhythms of the ore-bearing complex, respectively. Zircons of different age levels and genotypes were identified in the course of performed investigations. Gabbro are dominated by postmagmatic (superimposed) zircons with the datings of 239-225 Ma. The age of xenogenic zircon brought out from the basement rocks is estimated at 1146 ± 11 Ma. Zircons occur as magmatic and postmagmatic (superimposed) minerals dated 252-247, 244-233 Ma in diorite and 244-242, 239-224 Ma in granodiorite. The ages of postmagmatic zircons from diorite are partially overlapped by datings of magmatic zircons from granodiorite and granodiorite-porphyry. In the porphyry complex, the datings of magmatic zircons are 240-234 and 222-220 Ma in granodiorite-porphyries I and II, respectively. There are also inherited zircons with datings coinciding with those of magmatic zircons from precursor intrusive rocks. Datings of such zircons are 249-241 and 257-231 Ma for granodiorite-porphyries I and II, respectively. As a whole, zircon datings in all studied igneous rocks forming a virtually uninterrupted range in the period of 257-220 Ma allow us to suggest the relation of the ore magmatic system to the long-living constantly active deep source occasionally delivering melt to the upper levels. © Pleiades Publishing, Ltd., 2012.

Vernikovsky V.A.,Russian Academy of Sciences | Morozov A.F.,Federal Agency for Subsoil Use Rosnedra | Petrov O.V.,Karpinskii Russian Geological Research Institute | Travin A.V.,RAS Institute of Geology and Mineralogy | And 4 more authors.
Doklady Earth Sciences | Year: 2014

We present results of 40Ar/39Ar isotopic investigations concerning the dating of dolerites and basalts that were sampled during the Arctica-2012 polar expedition. Basalts were sampled by means of deep underwater drilling with wells up to 2 m in outcrops on the seafloor (basalts), and dolerite samples were obtained from the bottom of an escarp of Mendeleev Rise using a manipulator on the research submarine. The analysis results of the obtained mono-mineral fractions (amphibole, plagioclase, pyroxene) from the studied rocks yielded an Early Paleozoic age of the dolerites and basalts from Mendeleev Rise. The oldest ages obtained for amphibole reach 471.5 ± 18.1 and 466.9 ± 3.3 Ma, which corresponds to the Early-Middle Ordovician. The isotopic composition of argon was measured on two mass spectrometers: the Micromass Noble Gas 5400 (UK) and the Thermo Scientific Argus (Germany). The determined Early Paleozoic age of igneous rocks of Mendeleev Rise and seismic data obtained during the last Russian expedition Arctica-2012 [2] let us suppose that this continental block of the Earth's crust has a Precambrian basement similar to the basement identified for the New Siberian islands including the De Long archipelago. © 2014 Pleiades Publishing, Ltd.

Rodionov N.V.,Karpinskii Russian Geological Research Institute | Belyatsky B.V.,Karpinskii Russian Geological Research Institute | Antonov A.V.,Karpinskii Russian Geological Research Institute | Simakin S.G.,Russian Academy of Sciences | Sergeev S.A.,Karpinskii Russian Geological Research Institute
Doklady Earth Sciences | Year: 2015

On the basis of the local composition, baddeleyite grains that were less altered due to interaction with an alkaline melt and corresponded to the primary stage of crystallization of the intrusion were selected from the carbonatite intrusion of the Proterozoic polyphase Tiksheozero alkaline–ultramafic complex. The single age of carbonatite crystallization characterized of the bulk volume of the intrusion was estimated for the first time on the basis of 40 local U–Th–Pb (SHRIMP II) analyses of these grains. The overall concordant age of baddeleyite is 1994.8 ± 9.4 Ma, and the lower age limit of the polyphase complex formation is less than 1998.4 ± 3.5 Ma. © 2015, Pleiades Publishing, Ltd.

Velikoslavinskii S.D.,Russian Academy of Sciences | Kotov A.B.,Russian Academy of Sciences | Sal'nikova E.B.,Russian Academy of Sciences | Larin A.M.,Russian Academy of Sciences | And 5 more authors.
Doklady Earth Sciences | Year: 2011

This paper presents the results of Sm-Nd isotopic-geochemical and U-Pb geochronological studies of metamorphic (Ilikan Sequence) and associated igneous rocks from the Ilikan lithotectonic zone (terrane) located in the Dzhugdzhur-Stanovoi Superterrane from the Central Asian Foldbelt. The Nd model age, TNd(DM), of metamorphic rocks from the Ilikan Sequence is 2.6-3.2 Ga pointing to the likelihood that the lower boundary of their protolith formation probably does not exceed 2.6 Ga. The age of detrital zircons from metasedimentary rocks of the Ilikan Sequence is 2700-2900 Ma, which absolutely agrees with Sm-Nd isotopic-geochemical results. The U-Pb zircon age of metagabbro that intruded the rocks of the Ilikan Sequence and underwent high-temperature amphibolite metamophism with subsequent structural transformations is 2635 ± 4 Ma. The obtained results allow us to conclude that the age of the Ilikan Sequence is 2630-2700 Ma. All this gives grounds to state that the Dzhugdzhur-Stanovoi Superterrane in the Central Asian Foldbelt was formed due to amalgamation of non-Siberian terranes as is assumed for the Argun, Bureya, and Mamynskii terranes of the Amur Superterrane from the Central Asian Foldbelt. © 2011 Pleiades Publishing, Ltd.

Proskurnin V.F.,Karpinskii Russian Geological Research Institute | Palyanova G.A.,RAS Institute of Geology and Mineralogy | Karmanov N.S.,RAS Institute of Geology and Mineralogy | Bagaeva A.A.,Karpinskii Russian Geological Research Institute | And 2 more authors.
Doklady Earth Sciences | Year: 2011

Uytenbogaardtite has been observed when examining the ores of the Konechnoe gold ore occurrence, West Taimyr, which is the first find for the entire Taimyr-Severnaya Zemlya region. It is associated with native gold (fineness 520-560‰), pyrite, and sphalerite. Sphalerite is characterized by Fe, Cd, Ag, and Cu impurities. Zinc is present in siderite. In the ores of the Konechnoe ore occurrence, there is also native gold of the early generation with sphalerite, the latter containing chalcopyrite lamellae and being in association with arsenopyrite, pyrite, and galena. The peculiar compositions of microinclusions and impurities in sphalerite and other minerals and the presence of accessory minerals, such as monazite and apatite, reflect the specific metallogenic and geochemical characteristics of the Minina-Bol'shevik structural-metallogenic zone and serve as indicators of the potential of the North Taimyr area in terms of gold, silver, zinc, copper, lead, cadmium, strontium, thorium, and lanthanides. © Pleiades Publishing, Ltd., 2011.

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