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Now showing items 141-160 of 24313

THE CORRELATION OF MESOZOIC GOLD ORE DISTRICTS AT THE SINO-KOREAN AND ALDAN-STANOVOI SHIELDS

Kazansky V.I.; Yanovsky V.M. (2006)

The geological structure and gold ore potential of the activized Aldan-Stanovoi and Sino-Korean shields of East Asia are compared. These two regions show similar tendencies in their geological evolution during the Archean, ...
NEW DATA ON HYDROCARBONS IN AURIFEROUS CONGLOMERATES OF THE WITWATERSRAND ORE REGION, REPUBLIC OF SOUTH AFRICA

Kremenetsky A.A.; Maksimyuk I.E. (2006)

Genesis of deposits in the world's largest Witwatersrand auriferous region (South Africa) remains a debatable issue over several decades. Based on geological and mineralogical-geochemical investigations, we previously ...
DIAGENETIC ALTERATIONS OF COPPER SULFIDES IN MODERN ORE-BEARING SEDIMENTS OF THE LOGATCHEV-1 HYDROTHERMAL FIELD (MID-ATLANTIC RIDGE 14°45′ N)

Gablina I.F.; Gor'kova N.V.; Semkova T.A.; Stepanova T.V. (2006)

Sulfide ore samples recovered by corers from and beyond Orebody 1 in the Logatchev-1 hydrothermal field (Mid-Atlantic Ridge, 14°45′ N) are studied by optical, electron microscopic, X-ray microspectral, and X-ray diffraction ...
CHRONOLOGY OF HYDROTHERMAL AND MAGMATIC ACTIVITY IN THE DUKAT GOLD-SILVER ORE FIELD

Filimonova L.G.; Chugaev A.V. (2006)

The previously published and newly obtained geological and geochronological (Rb-Sr and Ar-Ar) data show that the igneous rocks and products of hydrothermal alteration in the Dukat ore field pertain to two ore-forming ...
ASTEROID 3628 BOžNěMCOVÁ: COVERED WITH ANGRITE-LIKE BASALTS?

Cloutis E.A.; Binzel R.P.; Burbine T.H.; Gaffey M.J.; McCoy T.J. (2006)

A detailed analysis of the reflectance spectrum of asteroid 3628 Božněmcová, previously identified as a possible ordinary chondrite parent body, indicates that its surface consists of an assemblage dominated by clinopyroxene ...
ORIGIN OF CENOMANIAN NODULAR PHOSPHORITES IN THE DNIEPER-DONETS DEPRESSION (PALEOGEOGRAPHIC ASPECT)

Kholodov V.N. (2006)

Paleogeographic settings of the Dnieper-Donets Depression are discussed with consideration of its Cenomanian provenance, land-sea proportions, and paleoclimate. The role of the Jurassic-Cretaceous weathering crust that ...
ESTIMATION OF HYDRAULIC CONDUCTIVITY ON CLAY CONTENT IN SOIL DETERMINED FROM RESISTIVITY DATA

Shevnin V.; Delgado-Rodríguez O.; Mousatov A.; Ryjov A. (2006)

The influence of clay content in sandy and clayey soils on hydraulic conductivity (filtration coefficient) is considered. A review of published experimental data on the relationship of hydraulic conductivity with soil ...
CARBON, OXYGEN, STRONTIUM, AND SULFUR ISOTOPIC COMPOSITIONS IN LATE PRECAMBRIAN ROCKS OF THE PATOM COMPLEX, CENTRAL SIBERIA: COMMUNICATION 2. NATURE OF CARBONATES WITH ULTRALOW AND ULTRAHIGH δ13C VALUES

Pokrovskii B.G.; Bujakaite M.I.; Melezhik V.A. (2006)

The Patom Complex is characterized by a unique association of carbonate rocks with ultralow (≤8‰) and ultrahigh (>6‰) δ13C values. The thickness, stable isotopic composition along the strike, and lithological and geochemical ...
SELENIUM IN COAL: A REVIEW

Yudovich Ya.E.; Ketris M.P. (2006)

The World average Se content in coals (coal Clarke of Se) for hard coals and brown coals are respectively 1.6 ± 0.1 and 1.0 ± 0.15 ppm. On an ash basis, these contents are greatly increased and are 9.9 ± 0.7 and 7.6 ± 0.6 ...
THE 2001-2004 DOME-FORMING ERUPTION OF SHIVELUCH VOLCANO, KAMCHATKA: OBSERVATION, PETROLOGICAL INVESTIGATION AND NUMERICAL MODELLING

Dirksen O.; Demyanchuk Y.; Humphreys M.C.S.; Melnik O.; Sparks R.S.J.; Mahony S.; Pletchov P. (2006)

There have been three episodes of lava dome growth at Shiveluch volcano, Kamchatka since the Plinian explosive eruption in 1964. The episodes in 1980-1981, 1993-1995 and 2001-2004 have discharged at least 0.27 km3 of silicic ...
CHARNOCKITE COMPOSITION IN RELATION TO THE TECTONIC EVOLUTION OF EAST ANTARCTICA

Mikhalsky E.V.; Sheraton J.W.; Hahne K. (2006)

Charnockitic suites in central Dronning Maud Land (DML), Mac.Robertson Land (MRL), and the Bunger Hills area are compositionally varied and probably include both mantle and lower-crustal components. In this paper we present ...
ALKALI EARTH ELEMENTS IN VENDIAN-CAMBRIAN CLAYEY ROCKS, THE EAST EUROPEAN PLATFORM

Felitsyn S.B. (2006)

Low Sr and Ca contents in fine-grained terrigenous rocks of the Vendian sedimentary cover in the East European Platform may be related to the following reasons: (1) the absence of authigenic carbonates in Vendian mudstones ...
COUPLED MODELING OF THE HYDROLOGICAL AND CARBON CYCLES IN THE SOIL-VEGETATION-ATMOSPHERE SYSTEM

Kuchment L.S.; Demidov V.N.; Startseva Z.P. (2006)

A coupled model of the hydrological and carbon cycles in the soil-vegetation-atmosphere system is suggested. The model describes the interception and evaporation of precipitation by canopy, transpiration, vertical transfer ...
PLEISTOCENE-HOLOCENE CALCAREOUS NANNOFOSSIL BIOSTRATIGRAPHY OF CORE SAMPLES FROM THE NORTHEASTERN SEA OF MARMARA, FENERBAHçE-PENDIK, NW TURKEY

Yildiz A.; Toker V. (2006)

Pseudoemiliana lacunosa, Gephyrocapsa oceanica and Emiliania huxleyi (Ionian) (Pleistocene-Holocene) calcareous nannoplankton zones were identified from 82 samples of 14 cores taken from 8 locations in the northeastern Sea ...
THE PERMIAN BIOSTRATIGRAPHY OF THE KOLYMA-OMOLON REGION, NORTHEAST ASIA

Ganelin V.G.; Biakov A.S. (2006)

The main features of the tectonics, Permian paleogeography, biota, structural-facies zonation of the Kolyma-Omolon region are analysed. The characteristics of the Permian regional stratigraphic scale of the Kolyma-Omolon ...
IMAGING STRAIN LOCALIZATION BY X-RAY COMPUTED TOMOGRAPHY: DISCRETE COMPACTION BANDS IN DIEMELSTADT SANDSTONE

Louis L.; Wong T.-f.; Tembe S.; Baud P. (2006)

Compaction localization was observed in Diemelstadt sandstone during triaxial experiments over a broad range of effective pressures (60-165 MPa). High resolution X-ray CT imaging was used to resolve the 3D the geometry of ...
PHYSIOGRAPHY AND TECTONIC SETTING OF THE SUBGLACIAL LAKE DISTRICT BETWEEN VOSTOK AND BELGICA SUBGLACIAL HIGHLANDS (ANTARCTICA)

Tabacco I.E.; Forieri A.; Cianfarra P.; Salvini F.; Zirizotti A. (2006)

We present the interpretation of 11 radio echo-sounding (RES) missions carried out over the Vostok-Dome Concordia region during the Italian Antarctic expeditions in the period 1995-2001. The extension and the density of ...
ANALOGUE BENCHMARKS OF SHORTENING AND EXTENSION EXPERIMENTS

Schreurs G.; Buiter S.J.H.; Boutelier D.; Cruden A.R.; Corti G.; Costa E.; Cavozzi C.; Daniel J.-M.; Mengus J.-M.; Hoth S.; Kukowski N.; Lohrmann J.; Hoffmann-Rothe A.; Koyi H.A.; Nilforoushan F.; Ravaglia A.; Schlische R.W.; Withjack M.O.; Elder Brady J.A.; Yamada Y.et al. (2006)

We report a direct comparison of scaled analogue experiments to test the reproducibility of model results among ten different experimental modelling laboratories. We present results for two experiments: a brittle thrust ...
SMALL-ANGLE AVO RESPONSE OF PS-WAVES IN TILTED TRANSVERSELY ISOTROPIC MEDIA

Behura J.; Tsvankin I. (2006)

Field records for small source-receiver offsets often contain intensive converted PS-waves that may be caused by the influence of anisotropy on either side of the reflector. Here, we study the small-angle reflection ...
FLOODING DYNAMICS IN A LARGE LOW-GRADIENT ALLUVIAL FAN, THE OKAVANGO DELTA, BOTSWANA, FROM ANALYSIS AND INTERPRETATION OF A 30-YEAR HYDROMETRIC RECORD

Wolski P.; Murray-Hudson M. (2006)

The Okavango Delta is a flood-pulsed wetland, which supports a large tourism industry and the subsistence of the local population through the provision of ecosystem services. In order to obtain insight into the influence ...

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