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Now showing items 17564-17583 of 26297

U – PB SHRIMP DATING OF ZIRCONS FROM THE ORE-BEARING KHARAELAKH INTRUSION (TALNAKH DISTRICT, RUSSIA)

Petrov O.V.; Malich K.N.; Shevchenko S.S.; Matukov D.I.; Presnyakov S.L.; Tolmacheva T.Yu.; Tuganova E.V.; Khalenev V.O. (2006)

World-class platinum-group-element (PGE)-Cu–Ni Oktyabr’skoe deposit closely linked to the Kharaelakh ultramafic–mafic intrusion is located in the northwestern corner of the Siberian Craton, Russia. In spite of its significant ...
U-PB (SHRIMP II) AGE OF ZIRCONS FROM ASH BEDS OF THE CHERNOKAMEN FORMATION, VENDIAN SYLVITSA GROUP (CENTRAL URALS)

Ronkin Yu.L.; Maslov A.V.; Mizens G.A.; Krupenin M.T.; Petrov G.A.; Lepikhina O.P.; Kornilova A.Yu.; Grazhdankin D.V.; Matukov D.I. (2006)

The Serebryanka and Sylvitsa groups on the western slope of the Urals characterize the Vendian section of the eastern folded framework of the East European Platform [1]. They are conspicuous against the background of the ...
U-PB AGE OF GABBRONORITES OF THE ZHEMCHUZHNYI MASSIF: CONSEQUENCES OF THE PALEOPROTEROZOIC EVOLUTION OF THE BELOMORIAN MOBILE BELT

Kudryashov N.M.; Balaganskii V.V.; Apanasevich E.A.; Ryungenen G.I. (1999)
U-PB AGE OF GRANITOIDS IN THE JUNCTION ZONE BETWEEN THE OLEKMA GRANITE-GREENSTONE AND ALDAN GRANULITE-GNEISS TERRANES

Salnikova E.B.; Kotov A.B.; Belyatskii B.V.; Yakovleva S.Z.; Morozova I.M.; Berezhnaya N.G.; Zagornaya N.Yu. (1997)

U-Pb dating of zircons from the reference granitoid complexes showed that principal thrusts in the northern flank of the junction zone between the Olekma granite-greenstone and Aldan granulite-gneiss terranes of the Aldan ...
U-PB AGE OF ROCKS OF THE MT. GENERAL'SKAYA LAYERED INTRUSION, KOLA PENINSULA

Bayanova T.B.; Smolkin V.F.; Uvkovich N.V.; Kyungenen G.L. (1999)
U-PB AND 207PB-206PB AGES OF ZIRCONS FROM BASALTIC EUCRITES: IMPLICATIONS FOR EARLY BASALTIC VOLCANISM ON THE EUCRITE PARENT BODY

Misawa K.; Yamaguchi A.; Kaiden H. (2005)

We have undertaken petrologic and SHRIMP U-Th-Pb isotopic studies on zircons from basaltic eucrites (Yamato [Y]-75011, Y-792510, Asuka [A]-881388, A-881467 and Padvarninkai) with different thermal and shock histories. ...
U-PB AND 39AR/40AR DATING AND SM-ND AND PB-PB ISOTOPIC STUDY OF THE KALGUTY MOLYBDENUM-TUNGSTEN ORE-MAGMATIC SYSTEM, SOUTHERN ALTAI

Annikova I.Yu.; Vladimirov A.G.; Vystavnoi S.A.; Kruk N.N.; Moroz E.N.; Rudnev S.N.; Zhuravlev D.Z.; Lepekhina E.N.; Matukov D.I.; Sergeev S.A.; Palesskii S.V.; Ponomarchuk V.A. (2006)

The Kalguty ore-magmatic system comprises two intrusive complexes: the Kalguty granite-leucogranite complex and Eastern Kalguty complex of dikes and small intrusions. U-Pb dating of individual zircon grains from granites ...
U-PB AND HF ISOTOPIC ANALYSIS OF ZIRCON IN LOWER CRUSTAL XENOLITHS FROM THE NAVAJO VOLCANIC FIELD: 1.4 GA MAFIC MAGMATISM AND METAMORPHISM BENEATH THE COLORADO PLATEAU

Crowley J.L.; Bowring S.A.; Schmitz M.D.; Williams M.L.; Karlstrom K.E. (2006)

Zircon from lower crustal xenoliths erupted in the Navajo volcanic field was analyzed for U-Pb and Lu-Hf isotopic compositions to characterize the lower crust beneath the Colorado Plateau and to determine whether it was ...
U-PB DATING OF PEROVSKITE BY LA-ICP-MS: AN EXAMPLE FROM THE OKA CARBONATITE, QUEBEC, CANADA

Cox R.A.; Wilton D.H.C. (2006)

The potential for U-Pb dating of the mineral perovskite, using laser ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS), has been evaluated. Perovskite can have relatively elevated U and Th contents, making ...
U-PB DATING OF THE VERKNIY UFALEY INTRUSION, MIDDLE URALS, RUSSIA: A MINIMUM AGE FOR SUBDUCTION AND AMPHIBOLITE FACIES OVERPRINT OF THE EAST EUROPEAN CONTINENTAL MARGIN

Hetzel R.; Romer R. (1999)

The Palaeozoic Uralian orogen formed by accretion of island arcs and microcontinents along the eastern margin of the East European platform. In the middle Urals, a promontory of the East European platform, the Ufaley Complex ...
U-PB DATING OF ZIRCON FROM THE LOWER CRUSTAL XENOLITHS, UDACHNAYA PIPE, YAKUTIA

Koreshkova M.Yu.; Nikitina L.P.; Vladykin N.V.; Matukov D.I. (2006)

This paper presents results of zircon dating of xenoliths from the Udachnaya Pipe. Mafic two-pyroxene garnet granulites (samples uk1 and uk2), mafic amphibole-bearing garnet granulite (uk11), and intermediate garnet granulite ...
U-PB DATINGS IN THE SODANKYLä SCHIST AREA, CENTRAL FINNISH LAPLAND

Räsänen J.; Huhma H. (2001)

The bedrock of the Sodankylä schist area consists mainly of Paleoproterozoic volcanic and sedimentary rocks penetrated by mafic and felsic intrusives. This paper reports c. 200 conventional U-Pb analyses mainly on zircon. ...
U-PB GCOCHRONOLOGY AND MAJOR -ELEMENT CHEMISTRY OF A DIORITE-PLAGIOGRAR.ITIC BCIHOLUH IN NORTHERN KARELIA

Bibikova E.V.; Slabunov A.I.; Kimozova T.I.; Makarov V.A.; Borisova E.Y.; Kavclich V.I. (1997)
U-PB GEOCHRONOLOGY OF RIPHEAN SANDSTONE AND GABBRO FROM SOUTHEAST SIBERIA AND ITS BEARING ON THE LAURENTIA-SIBERIA CONNECTION

Rainbird R.H.; Stern R.A.; Khudoley A.K.; Kropachev A.P.; Heaman L.M.; Sukhorukov V.I. (1998)

Thirty-one detrital zircons from the mid–late Riphean Mayamkan Formation sandstone (Uy Group) of the Sette–Daban fold belt, southeast Siberia yielded SHRIMP 207Pb/206Pb ages ranging between 1500 and 1050 Ma. Other grains ...
U-PB GEOCHRONOLOGY OF SPELEOTHEMS BY MC-ICPMS

Woodhead J.; Hellstrom J.; Maas R.; Drysdale R.; Zanchetta G.; Devine P.; Taylor E. (2006)

Building upon the work of Richards et al. [1998. U-Pb dating of a speleothem of Quaternary age. Geochimica et Cosmochimica Acta 62, 3683-3688], we have developed a method for precise dating of speleothems beyond the range ...
U-PB MINERAL AGE DETERMINATIONS FROM ARCHEAN ROCKS IN EASTERN LAPLAND

Juopperi H.; Vaasjoki M. (2001)

The bedrock in eastern Lapland is divided into the Naruska, Ahmatunturi and Vintilänkaira-Kemihaara granitoid complexes and the supracrustal Tuntsa metasedimentary and Tulppio metavolcanic belts. Traditionally the bedrock ...
U-PB SHRIMP GEOCHRONOLOGY AND TRACE-ELEMENT GEOCHEMISTRY OF COESITE-BEARING ZIRCONS, NORTH-EAST GREENLAND CALEDONIDES

McClelland W.C.; Power S.E.; Gilotti J.A.; Mazdab F.K.; Wopenka B. (2006)

Obtaining reliable estimates for the timing of eclogite-facies metamorphism is critical to establishing models for the formation and exhumation of high-pressure and ultrahigh-pressure (UHP) metamorphic terranes in collisional ...
U-PB SINGLE-ZIRCON DATING UNDER CATHODOLUMINESCENCE CONTROL (CLC-METHOD): APPLICATION TO POLYMETAMORPHIC ORTHOGNEISSES

Poller U.; Liebetrau V.; Todt W. (1997)

The dating of polymetamorphic rocks with the U-Pb zircon method often results in discordant data. Thus a new technique combining cathodoluminescence imaging (CL) and thermal ion mass spectrometry (TIMS) measurements was ...
U-PB SYSTEMATICS OF PROTEROZOIC CARBONATE ROCKS: THE INZER FORMATION OF THE UPPER RIPHEAN STRATOTYPE (SOUTHERN URALS)

Ovchinnikova G.V.; Vasil'eva I.M.; Kuznetsov A.B.; Gorokhov I.M.; Gorokhovskii B.M.; Levskii L.K.; Semikhatov M.A. (1998)

U-Pb and Pb-Pb isotopic systems were studied in limestones of the Inzer Formation representing the middle part of the Karatau Group of the Urals, whose section is authorized as the Upper Riphean stratotype. Carbonate rock ...
U-PB SYSTEMATICS OF THE MCCLURE MOUNTAIN SYENITE: THERMOCHRONOLOGICAL CONSTRAINTS ON THE AGE OF THE 40AR/39AR STANDARD MMHB

Schoene B.; Bowring S.A. (2006)

Recent advances in U-Pb geochronology allow unprecedented levels of precision in the determination of geological ages. However, increased precision has also illuminated the importance of understanding subtle sources of ...

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