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ZEMKORITE, A NEW CARBONATE FROM KIMBERLITES OF YAKUTIA

Ushchapovskaya Z.F.; Kashayev A.A.; Sizykh Y.I.; Yegorov N.K.; Bogdanov G.V. (1988)

In the Udachnaya kimberlite pipe in the Daldyn field, Yakutia, the authors discovered and studied in our Institute the new carbonate Na2Ca(CO3)2, called zemkorite and close in composition to the known carbonate nyerereite, ...

ZEOLITES IN HYDROTHERMALLY ALTERED ROCKS

Utada M. (2001)

Over the past 40 years, two universally accepted maxims of geology dealing with zeolite minerals have been shown to be incorrect: the first is that zeolites occur primarily as cavity fillings in basaltic igneous rocks, and ...

ZINC IN SPINELS OF PERIDOTITE XENOLITHS FROM PLIOCENE BASANITES OF THE VITIM VOLCANIC FIELD

Litasov K.D.; Mekhonoshin A.S. (2000)

A group of low-temperature peridotites with equigranular mosaic texture is distinguished among spinel peridotite xenoliths from Pliocene basanites of the Dzhilinda River. The mineral compositions of these peridotites are ...

'ZIPPER-RIFT': A TECTONIC MODEL FOR NEOPROTEROZOIC GLACIATIONS DURING THE BREAKUP OF RODINIA AFTER 750 MA

Eyles N.; Januszczak N. (2004)

The ‘Snowball Earth’ model of Hoffman et al. [Science 281 (1998) 1342] has stimulated renewed interest in the causes of glaciation in Earth history and the sedimentary, stratigraphic and geochemical response. The model ...

ZIRCON (U-TH)/HE THERMOCHRONOMETRY: HE DIFFUSION AND COMPARISONS WITH 40AR/39AR DATING

Reiners P.W.; Spell T.L.; Nicolescu S.; Zanetti K.A. (2004)

(U-Th)/He chronometry of zircon has a wide range of potential applications including thermochronometry, provided the temperature sensitivity (e.g., closure temperature) of the system be accurately constrained. We have ...

ZIRCON GEOCHRONOLOGY OF THE ALEKSANDROV METAMORPHIC COMPLEX, SOUTHERN URALS

Krasnobaev A.A.; Cherednichenko N.V. (2004)

The Aleksandrov Complex (AC) of metamorphic rocks is restricted to the long-lived Zyuratkul Fault on the western slope of the southem Urals, 2-3 km east of the known Taratash Complex. It makes up a NNE-trending tectonic ...

ZIRCON GEOCHRONOLOGY OF THE SALDA METAMORPHIC COMPLEX, CENTRAL URALS

Krasnobaev A.A.; Davydov V.A. (2003)

Investigations of zircon geochronology of the Salda metamorphic complex are continued in case of metamorphic rocks in eastern slope of Middle Urals. Results of the investigations make it possible to compare analytic and ...

ZIRCON MEGACRYSTS FROM KIMBERLITE: OXYGEN ISOTOPE VARIABILITY AMONG MANTLE MELTS

Valley J.W.; Spicuzza M.J.; Kinny P.D.; Schulze D.J. (1998)

The oxygen isotope ratios of Phanerozoic zircons from kimberlite pipes in the Kaapvaal Craton of southern Africa and the Siberian Platform vary from 4.7 to 5.9‰ VSMOW. High precision, accurate analyses by laser reveal ...

ZIRCON PARAGENESES IN MIGMATITES OF THE PRE-RIPHEAN CRYSTALLINE BASEMENT OF THE SIKHOTE ALIN

Levashev G.B.; Semenova N.N.; Sapin V.I. (1989)

Microprobe study of zircon parageneses in migmatites of different origin shows that the geochemical properties of zircon could be used to solve important petrological and geochemical problems. The standards employed for ...

ZIRCON REACTION AND STABILITY OF THE U-PB ISOTOPE SYSTEM DURING INTERACTION WITH CARBONATE FLUID: EXPERIMENTAL HYDROTHERMAL STUDY

Rizvanova N.G.; Levchenkov O.A.; Maslenikov A.V.; Komarov A.N.; Makeev A.F.; Levskiy L.K.; Belous A.E.; Bezmen N.I. (2000)

The interpretation of metamorphically induced U-Pb isotopic discordance requires a thorough understanding of zircon-fluid interactions. With this aim we have studied the behaviour of metamict and crystalline zircon phases ...

ZIRCON TRACE ELEMENT GEOCHEMISTRY: PARTITIONING WITH GARNET AND THE LINK BETWEEN U-PB AGES AND METAMORPHISM

Rubatto D. (2002)

With the aim to link zircon composition with paragenesis and thus metamorphic conditions, zircons from eclogite- and granulite-facies rocks were analysed for trace elements using LA-ICP-MS and SHRIMP ion microprobe. ...

ZIRCON U-PB AND OXYGEN ISOTOPE EVIDENCE FOR A LARGE-SCALE 18O DEPLETION EVENT IN IGNEOUS ROCKS DURING THE NEOPROTEROZOIC

Zheng Y.F.; Wu Y.B.; Chen F.K.; Gong B.; Li L.; Zhao Z.F. (2004)

Oxygen isotope analysis and U-Pb dating were carried out on zircons from granite, granitic gneiss and eclogite in the Dabie-Sulu orogenic belt of east-central China. The results show a wide variation in zircon δ18O values ...

ZIRCONIUM AND HAFNIUM IN ZIRCONS FROM ARCHEAN ENDERBITES OF THE SUNNAGIN DOME (ALDAN SHIELD) AND EVOLUTION OF THE ANCIENT CONTINENTAL CRUST

Glukhovskii M.Z.; Moralev V.M.; Borisovskii S.E. (2001)

ZIRCONIUM ISOTOPE EVIDENCE FOR INCOMPLETE ADMIXING OF R-PROCESS COMPONENTS IN THE SOLAR NEBULA

Schonbachler M.; Lee D.C.; Rehkamper M.; Halliday A.N.; Fehr M.A.; Hattendorf B.; Gunther D. (2003)

Isotopic anomalies in Mo and Zr have recently been reported for bulk chondrites and iron meteorites and have been interpreted in terms of a primordial nucleosynthetic heterogeneity in the solar nebula. We report precise ...

ZIRCONOLOGY OF METAMORPHIC ROCKS IN THE IL'INO COMPLEX, SOUTHERN URALS

Krasnobaev A.A.; Cherednichenko N.V.; Chashchukhina V.A.; Puzhakov B.A. (2001)

ZIRCONOLOGY OF THE SELYANKINO BLOCK IN THE IL'MENY MOUNTAINS

Krasnobaev A.A.; Davydov V.A.; Cherednichenko N.V.; Shchul'kin E.P. (2001)

ZIRKELITE FROM THE SEBL'YAVR CARBONATITE COMPLEX, KOLA PENINSULA, RUSSIA: AN X-RAY AND ELECTRON MICROPROBE STUDY OF A PARTIALLY METAMICT MINERAL

Bulakh A.G.; Nesterov A.R.; Anisimov I.S.; Williams C.T. (1998)

Zirkelite, a cubic mineral of general formula (Ti,Ca,Zr)O 2−x occurs as an accessory mineral in phoscorites, carbonatites and associated rocks in the Sebl'yavr complex. After pyrochlore, it is the main mineral concentrating ...

ZNO SOLUBILITY AND ZN2 COMPLEXATION BY CHLORIDE AND SULFATE IN ACIDIC SOLUTIONS TO 290°C WITH IN-SITU PH MEASUREMENT - CORRELATIONS AMONG STANDARD MOLAL THERMODYNAMIC PROPERTIES OF AQUEOUS IONS AND HYDROXIDE COMPLEXES

Wesolowski D.J.; Benezeth P.; Palmer D.A. (1998)

The solubility of zincite in mildly to strongly acidic aqueous solutions, according to the reaction ZnO + 2H+ # Zn2+ + H2O, has been measured at ionic strengths of 0.03-1.0 (stoichiometric molal basis) from 50 to 290°C at ...

ZONAL METAMORPHISM AND PETROLOGY OF METAPELITES IN THE TIM-YASTREBOVSKAYA STRUCTURE, VORONEZH CRYSTALLINE MASSIF

Savko K.A.; Polyakova T.N. (2001)

Our detailed petrographic study of the Early Proterozoic metapelites of the Tim-Yastrebovskaya structure resulted in distinguishing the following four metamorphic zones: garnet-chlorite, staurolite-andalusite. staurolite ...

ZONAL SUBDIVISIONS OF THE QUATERNARY IN EASTERN EUROPE BASED ON SMALL MAMMALS

Vangengeim E.A.; Pevzner M.A.; Tesakov A.S. (2001)

A scheme of small mammal (vole) zones is proposed for the Quaternary of Eastern Europe. The zonation is based on the evolutionary appearance of new forms in the Borsodia-Prolagurus-Lagurus, Mimomys-Arvicola, and ...

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