Геология России: Recent submissions

Now showing items 1541-1560 of 43490

ELECTRICAL PROPERTIES OF HYDROTHERMALLY ALTERED DACITE FROM THE PACMANUS HYDROTHERMAL FIELD (ODP LEG 193)

Bartetzko A.; Klitzsch N.; Arnold J.; Iturrino G.; Kaufhold S. (2006)

Ocean Drilling Program Leg 193 drilled two sites at the PACMANUS hydrothermal field, Snowcap and Roman Ruins. We investigated electrical properties of core samples recovered from these sites to study the effect of hydrothermal ...
HIGH-PRECISION U-PB ZIRCON AGE FROM THE TRIASSIC OF ITALY: IMPLICATIONS FOR THE TRIASSIC TIME SCALE AND THE CARNIAN ORIGIN OF CALCAREOUS NANNOPLANKTON AND DINOSAURS

Furin S.; Gianolla P.; Preto N.; Rigo M.; Roghi G.; Crowley J.L.; Bowring S.A. (2006)

The Triassic time scale is poorly constrained due to a paucity of high-precision radiometric ages. We present a 206Pb/238U age of 230.91 ± 0.33 Ma (error includes all known sources) for zircon from an ash bed in the upper ...
SEQUENCE STRATIGRAPHY OF PYEONGAN SUPERGROUP (CARBONIFEROUS-PERMIAN), TAEBAEK AREA, MIDEAST KOREA

Lee H.S.; Chough S.K. (2006)

This study focuses on the sequence stratigraphy of the Pyeongan Supergroup (Carboniferous-Permian), central-eastern Korea. The supergroup consists of about 1700-m-thick siliciclastic deposits, disconformably overlying the ...
STRATIGRAPHIC DISTRIBUTION OF MACERALS AND BIOMARKERS IN THE DONETS BASIN: IMPLICATIONS FOR PALEOECOLOGY, PALEOCLIMATOLOGY AND EUSTACY

Izart A.; Elie M.; Alsaab D.; Sachsenhofer R.F.; Rainer T.; Sotirov A.; Zdravkov A.; Privalov V.A.; Antsiferov V.A.; Panova E.A.; Zhykalyak M.V. (2006)

More than one hundred and thirty coal seams and coaly layers occur in the Donets Basin (Donbas). Twenty-eight (52 samples) of them, ranging in age from Serpukhovian (Late Mississipian) to Gzhelian (Late Pennsylvanian), 33 ...
FLUID INCLUSIONS IN APATITE FROM JACUPIRANGA CALCITE CARBONATITES: EVIDENCE FOR A FLUID-STRATIFIED CARBONATITE MAGMA CHAMBER

Costanzo A.; Moore K.R.; Feely M.; Wall F. (2006)

Carbonatites of the Jacupiranga alkaline-carbonatite complex in São Paulo State, Brazil, were used to investigate mineral-fluid interaction in a carbonatite magma chamber because apatite showed a marked discontinuity between ...
SORPTION PROPERTIES OF152EU AND241AM IN GEOLOGICAL MATERIALS: EU AS AN ANALOGUE FOR MONITORING THE AM BEHAVIOUR IN HETEROGENEOUS GEOLOGICAL ENVIRONMENTS

Lee S.-G.; Lee K.Y.; Cho S.Y.; Yoon Y.Y.; Kim Y. (2006)

In order to confirm the similar behavior of Eu and Am in heterogeneous geological materials, we carried out the batch experiments for determining the sorption property of radionuclides, 152Eu and 241Am. We used four different ...
ROLE OF CRUSTAL CONTAMINATION IN FORMATION OF THE JINCHUAN INTRUSION AND ITS WORLD-CLASS NI-CU-(PGE) SULFIDE DEPOSIT, NORTHWEST CHINA

Song X.-Y.; Zhou M.-F.; Wang C.Y.; Qi L.; Zhang C.-J. (2006)

The Jinchuan ultramafic body on the southwestern margin of the North China craton hosts a giant Ni-Cu-(PGE) deposit. This dike-like intrusion consists mainly of lherzolite, dunite, and minor pyroxenite. Fortly-seven vol% ...
GEOLOGY AND GEOCHEMISTRY OF THE RAPU-RAPU OPHIOLITE COMPLEX, EASTERN PHILIPPINES: POSSIBLE FRAGMENT OF THE PROTO-PHILIPPINE SEA PLATE

Yumul G.P.; Dimalanta C.B.; Tamayo R.A.; Zhou M.F. (2006)

The Cretaceous Rapu-Rapu Ophiolite Complex is a dismembered marginal basin ophiolite formed at an intermediate to fast spreading center. Limited subduction is manifested by the crystallization of pyroxene before plagioclase ...
MODELS, DATA MECHANISMS: QUANTIFYING WILDFIRE REGIMES

Millington J.D.A.; Malamud B.D.; Perry G.L.W. (2006)

The quantification of wildefire regimes specially the relationship between the frequency which events occur and their size, is of particular interest to both ecologists and wildfire managers. Recent studies in cellular ...
COMPRESSIONAL DEFORMATION NORTH OF THE EASTER MICROPLATE: A MANNED SUBMERSIBLE AND SEAFLOOR GRAVITY INVESTIGATION

Searle R.C.; Francheteau J.; Armijo R. (2006)

We have investigated an E-W compressional ridge in 0.9 Ma lithosphere of the Nazca Plate, just north of the Easter microplate on the East Pacific Rise, using a combination of visual observation and seabed gravity measurements ...
DISCONTINUOUS MELT EXTRACTION AND WEAK REFERTILIZATION OF MANTLE PERIDOTITES AT THE VEMA LITHOSPHERIC SECTION (MID-ATLANTIC RIDGE)

Brunelli D.; Bonatti E.; Seyler M.; Cipriani A.; Ottolini L. (2006)

Melting processes beneath the Mid-Atlantic Ridge were studied in residual mantle peridotites sampled from a lithospheric section exposed near the Vema Fracture Zone at 11°N along the Mid-Atlantic Ridge. Fractional and ...
MULTIPLE BOTTOM-SIMULATING REFLECTIONS IN THE BLACK SEA: POTENTIAL PROXIES OF PAST CLIMATE CONDITIONS

Popescu I.; De Batist M.; Poort J.; Versteeg W.; Panin N.; Lericolais G.; Nouzé H.; Gillet H. (2006)

A previously unknown pattern of multiple bottom-simulating reflections (BSRs) occurs on high-resolution reflection seismic data in the Danube deep-sea fan, associated with acoustic features indicating free gas. Our study ...
STABLE ISOTOPES OF CARBON FROM BASALTIC ROCKS AND THEIR POSSIBLE RELATION TO ATMOSPHERIC ISOTOPE EXCURSIONS

Hansen H.J. (2006)

Repeated short-time negative excursions from the general trend of organic carbon isotopes occur at, and shortly after, the Permo-Triassic and Cretaceous-Tertiary mass extinctions. The cause of these excursions is unexplained ...
SURFACE ELECTRONIC STATES OF METEORITIC NANODIAMONDS

Garvie L.A.J. (2006)

The C K edge of Orgueil nanodiamonds (Cδ diamonds) was acquired by electron energy-loss spectroscopy (EELS), with an energy resolution of 300 meV. The spectra show peaks at 282.5, 284.7, and 286.4 eV, which occur in the ...
MAGNETIC PROPERTIES OF LOESS DEPOSITS ON THE NORTHEASTERN QINGHAI-TIBETAN PLATEAU: PALAEOCLIMATIC IMPLICATIONS FOR THE LATE PLEISTOCENE

Wang X.; Lu H.; Xu H.; Deng C.; Chen T. (2006)

The loess-palaeosol deposit on the northeastern Qinghai-Tibetan Plateau is sensitive to environmental changes, thus providing a good opportunity to investigate regional palaeoenvironmental evolution and its relationship ...
A RECORD OF FLUCTUATING BOTTOM CURRENTS ON THE SLOPES WEST OF THE PORCUPINE BANK, OFFSHORE IRELAND - IMPLICATIONS FOR LATE QUATERNARY CLIMATE FORCING

Øvrebø L.K.; Haughton P.D.W.; Shannon P.M. (2006)

Both local and regional controls on slope sedimentation west of Porcupine Bank are assessed using an array of 25 gravity cores, integrated with shallow seismic, TOBI side-scan and high-resolution bathymetry data. The cores ...
LATTICE PREFERRED ORIENTATION AND SEISMIC ANISOTROPY IN SEDIMENTARY ROCKS

Valcke S.L.A.; Casey M.; Lloyd G.E.; Kendall J.-M.; Fisher Q.J. (2006)

Although it is well known that sedimentary rocks can be seismically anisotropic, there have been few detailed investigations of the underlying cause of such anisotropy. Here, we investigate anisotropy due to the preferred ...
SEISMIC EVIDENCE OF DIVERGENT RIFTING AND SUBSEQUENT DEFORMATION IN THE SOUTHERN JAPAN SEA, AND A CENOZOIC TECTONIC SYNTHESIS OF THE EASTERN EURASIAN MARGIN

Itoh Y.; Uno K.; Arato H. (2006)

Neogene rift system configuration for the back-arc of southwest Japan, southern rim of the Japan Sea, is argued on the basis of reflection seismic interpretation. Divergent rifting and subsequent contraction provoked by ...
MODELING WIDTH ADJUSTMENT IN MEANDERING CHANNELS

Chen D.; Duan J.G. (2006)

Widening in sinuous channels occurs when the retreat of the outer bank exceeds the advance of the opposite bank. An analytical model is presented to simulate width adjustment in meandering channels of non-cohesive bank ...
SUBSOLIDUS DEUTERIC/HYDROTHERMAL ALTERATION OF EUDIALYTE IN LUJAVRITE FROM THE PILANSBERG ALKALINE COMPLEX, SOUTH AFRICA

Mitchell R.H.; Liferovich R.P. (2006)

The most evolved rocks of the Pilansberg alkaline complex are aegirine lujavrites in which three varieties of eudialyte are recognized on the basis of textural relationships and composition. Manganoan eudialyte-I is a ...

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