Age of the Vishnyakovskoe deposit of rare-metal pegmatites (East Sayan): U-Pb geochronological study of manganotantalite     

E. B. Sal’nikova  A. M. Larin  S. Z. Yakovleva  A. B. Kotov  V. A. Glebovitskii  A. V. Tkachev  I. V. Anisimova  Yu. V. Plotkina  B. M. Gorokhovskii 《Doklady Earth Sciences》2011,441(1):1479-1483

The U-Pb age of the manganotantalite from rare-metal pegmatites of the Vishnyakovskoe deposit (East Sayan Belt) has been assessed at 1838 ± 3 Ma. The acquired data indicate the pegmatites of this deposit and associated granites of the Sayan complex belong to the postcollision South Siberian igneous belt (1.88–1.84 Ga), which stretches along the southwestern frame of the Siberian Craton by more than 2500 km, from the Yenisei Ridge to the Aldan Shield. Formation of this igneous belt is related to joining (starting from about 1.9 Ga BP) of the series of continental microplates and island arcs to the Siberian Craton; this led to final stabilization of the craton at about 1.8 Ga BP.  相似文献   

Gold and silver tellurides in the Shirokinsky ore-and-placer cluster,the Sette-Daban Ridge,Yakutia     

G. S. Anisimova  L. A. Kondrat’eva  N. V. Leskova 《Geology of Ore Deposits》2011,53(7):620-625

The first findings of Au and Ag tellurides (sylvanite and petzite) in sulfide-quartz ore of the Shirokinsky ore and placer cluster located in the Sette-Daban Horst-Anticlinorium are described. These minerals were found for the first time at the gold deposits of East Yakutia. The chemical compositions (wt %) of sylvanite (23.65–24.61 Au, 12.7–13.13 Ag, 59.3–59.97 Te, 96.26–97.97 in total) and petzite (23.17–25.24 Au, 42.27–44.40 Ag, 31.26–33.37 Te, 98.19–102.55 in total) are reported. Galena as a host mineral is associated with native gold, electrum, hessite, and stützite. The finding of Au-Ag and Ag tellurides provides evidence for the development of Au-telluride mineralization in the Sette-Daban Horst-Anticlinorium.  相似文献   

Weissbergite (TlSbS2) and Avicennite (Tl2O3), Rare Thallium Minerals: First Findings in Yakutia     

Anisimova  G. S.  Kondratieva  L. A.  Kardashevskaia  V. N. 《Geology of Ore Deposits》2022,64(7):424-431

Geology of Ore Deposits - Rare thallium minerals, avicennite and weissbergite, were found for the first time within the karst zones of the Khokhoy field of the Verkhnyaya Amga gold area, South...  相似文献   

Age of the Ust’-Gilyui sequence in the Stanovoi Complex of the Selenga-Stanovoi Superterrain, Central Asian fold belt     

S. D. Velikoslavinskii  A. B. Kotov  E. B. Salnikova  A. M. Larin  A. A. Sorokin  A. P. Sorokin  V. P. Kovach  E. V. Tolmacheva  S. Z. Yakovleva  I. V. Anisimova 《Doklady Earth Sciences》2012,444(2):661-665

According to the results of U-Pb geochronological investigations, the age of the amphibolite protoliths (metabasalts) in the Ust??-Gilyui sequence within the Stanovoi Complex of the Amazar-Gilyui structural and formational zone in the Selenga-Stanovoi Superterrain of the Central Asian fold belt can be estimated at 193 ± 1 Ma. The Nd model age of the Ust??-Gilyui metasedimentary rocks is in the interval of t _Nd(DM) = 1.1?C3.1 Ga. This information along with the previously obtained geochronological data are indicative of the fact that the Ust??-Gilyui sequence consists of metasedimentary and metavolcanic rocks of various ages: (1) volcanic rocks with the age of 193 ± 1 Ma; (2) metasedimentary and metavolcanic rocks broken through by the Paleozoic granitoids dated to 370 Ma and characterized by minimum estimations of t _Nd(DM) = 1.1 Ga, i.e., rocks with an age of 1.1?C0.4 Ga. In addition, it is quite possible that this sequence also includes more ancient rocks. The SSS Amazar-Gilyui structural and formational zone is likely to be a tectonic mélange composed of the metasedimentary and metavolcanic rocks of the Mesozoic and, probably, Paleozoic and Early Precambrian ages. The studied zone was formed in the Mesozoic, most likely, in the course of the collision processes initiated by the closing up of the Mongol-Okhotsk Ocean.  相似文献   

Kinematics of stars in Kovalsky-Kapteyn figures. II     

R. B. Shatsova  G. B. Anisimova 《Astrophysics》1990,33(3):518-527

Rostov State Pedagogical Institute; All-Union Scientific Research Institute Gradient. Translated from Astrofizika, Vol. 33, No. 3, pp. 379–393, November–December, 1990.  相似文献   

Discharge of Salt Groundwater in the Estuary of the Razdol’naya River (Amur Bay) in February 2020     

Semkin  P. Yu.  Tishchenko  P. Ya.  Charkin  A. N.  Pavlova  G. Yu.  Tishchenko  P. P.  Anisimova  E. V.  Barabanshchikov  Yu. A.  Leusov  A. E.  Mikhailic  T. A.  Tibenko  E. Yu.  Chizhova  T. L. 《Water Resources》2021,48(3):345-350

Water Resources - In February 2020, geochemical tracers along with hydrochemical and hydrological characteristics were used to reveal a discharge site of salt groundwaters in the head of the...  相似文献   

The Early Cambrian age of intraplate mafic–ultramafic plutons of the Ulutau sialic Massif (Central Kazakhstan)     

A. A. Tretyakov  K. E. Degtyarev  A. B. Kotov  E. B. Salnikova  I. V. Anisimova  Yu. V. Plotkina 《Doklady Earth Sciences》2017,472(2):163-166

U–Pb dating of tonalite of the Shaytantas Pluton located within the Ulutau sialic Massif (Central Kazakhstan) has been carried out. Their crystallization age of 521 ± 2 Ma corresponds to the Early Cambrian (boundary of Stages 2 and 3). The obtained geochronological data allow us to identify the Early Cambrian stage of the intraplate magmatic activity in the history of formation of the sialic massifs in the western part of the Central Asian fold belt.  相似文献   

The late Tonian Zhaunkar granite complex of the Ulutau sialic massif,Central Kazakhstan     

A. A. Tretyakov  K. E. Degtyarev  E. B. Salnikova  K. N. Shatagin  A. B. Kotov  I. V. Anisimova  Yu. V. Plotkina 《Doklady Earth Sciences》2017,473(2):411-415

The crystallization age of Zhaunkar granites (829 ± 10 Ma) was determined by U–Pb zircon dating. Taking into account the data obtained earlier on the granite age (791 ± 7 Ma) in the Aktas Complex and the syenite age (673 ± 2 Ma) in the Karsakpai Complex, the Ulutau sialic massif is assumed to be composed of three igneous complexes formed during the Tonian–Cryogenian periods of the Neoproterozoic.  相似文献   

Mesozoic age of granitoids from the Beket complex (Gonzha block within the Argun terrane of the Central-Asian Fold Belt)     

A. B. Kotov  A. A. Sorokin  E. B. Sal’nikova  A. P. Sorokin  A. M. Larin  S. D. Velikoslavinskii  T. V. Belyakov  I. V. Anisimova  S. Z. Yakovleva 《Doklady Earth Sciences》2009,429(2):1457-1461

U-Pb geochronological results confirm the Mesozoic age (124 ± 1 Ma) of the Beket granitoid complex, previously interpreted as being one of the markers amongst the Early Proterozoic magmatic complexes within the Amur superterrane (microcontinent) of the Central Asian Fold Belt. This implies that the structural and metamorphic amphibolite facies overprints documented either in the Beket granitoids or Gonzha host rocks are evidently Mesozoic rather than Early Proterozoic in age.  相似文献   

Relationship between Magmatic,Metamorphic, and Hydrothermal Processes within the Baikal–Muya Terrane (Eastern Siberia): Constraints from High-Precision Geochronological Study of the Kedrovskii Granitoid Massif     

Chugaev  A. V.  Chernyshev  I. V.  Rytsk  E. Y.  Salnikova  E. B.  Nosova  A. A.  Travin  A. V.  Kotov  A. B.  Fedoseenko  A. M.  Anisimova  I. V. 《Doklady Earth Sciences》2019,489(1):1363-1367

Doklady Earth Sciences - High-precision dating of granitoids is of key significance for age identification of the main stages of crust formation in various blocks of the continental crust. Here we...  相似文献