Геология России: Recent submissions

Now showing items 741-760 of 41109

INFLUENCE OF COMPOSITION AND THERMAL HISTORY OF VOLCANIC GLASSES ON WATER CONTENT AS DETERMINED BY MICRO-RAMAN SPECTROMETRY

Muro A.D.; Villemant B.; Giordano D.; Romano C.; Montagnac G.; Scaillet B. (2006)

Development of Raman spectrometry for quantification of water content in natural glasses requires the assessment of the dependence of the technique on glass composition and thermal history. In the low frequency domain, ...
SHALLOW-WATER GASTROPODS FROM LATE OXFORDIAN SANDS IN KłEBY (POMERANIA, POLAND)

Gründel J.; Kaim A. (2006)

The Upper Oxfordian shell-bearing ferruginous sands from Kłeby in Pomerania (northwestern Poland) provide a rich and relatively well-preserved shallow-water gastropod fauna that has been known in the literature since the ...
CARBONATITES AND KAMAFUGITES IN ITALY: MANTLE-DERIVED ROCKS THAT CHALLENGE SUBDUCTION

Lavecchia G.; Stoppa F.; Creati N. (2006)

The carbonatite and kamafugite (i.e. potassic melilitite) rock-types of the Intramontane Ultra-alkaline Province (IUP, Italy) form a geologically rare, albeit not unique, ultramafic association. Their composition is in the ...
TRANSPORT OF LOW 240PU/239PU ATOM RATIO PLUTONIUM-SPECIES IN THE OB AND YENISEY RIVERS TO THE KARA SEA

Lind O.C.; Oughton D.H.; Salbu B.; Skipperud L.; Sickel M.A.; Brown J.E.; Fifield L.K.; Tims S.G. (2006)

Plutonium (Pu) isotope ratios can be used to differentiate between sources of Pu contamination such as nuclear weapon production, weapon fallout as well as accidental and routine releases from nuclear installations. To ...
ORDER AND ANTI-ORDER IN OLIVINE II: THERMODYNAMIC ANALYSIS AND CRYSTAL-CHEMICAL MODELLING

Kroll H.; Heinemann R.; Kirfel A. (2006)

The equilibrium order/anti-order behavior in olivine Fe0.48Mg0.52[SiO4]is analysed in terms of the Thompson (1969, 1970) model for the Gibbs energy due to ordering, Gord, Gord=-1/2ΔGexch0 Q-TSconford ΔGexch0 = ΔHexch0 ...
ORDER AND ANTI-ORDER IN OLIVINE I: STRUCTURAL RESPONSE TO TEMPERATURE

Heinemann R.; Kroll H.; Kirfel A.; Barbier B. (2006)

The crystal structure of Fe0.48Mg0.52[SiO4] olivine from the Boseti volcano, Ethiopia, has been investigated by single-crystal X-ray diffractometry at temperatures between 20 °C and 900 °C. For temperatures up to 600 °C, ...
COUPLED LANDSCAPE-LAKE EVOLUTION IN HIGH ARCTIC CANADA

Hove P.V.; Vincent W.F.; Belzile C.; Gibson J.A.E. (2006)

We profiled five ice-covered lakes and two ice-covered fiords of Ellesmere Island at the northern limit of High Arctic Canada to examine their environmental characteristics, and to evaluate the long-term limnological ...
EXPERIMENTAL DETERMINATION OF THE SOLUBILITY OF NATURAL WOLLASTONITE IN PURE WATER UP TO PRESSURES OF 5 GPA AND AT TEMPERATURES OF 400-800°C

Fockenberg T.; Burchard M.; Maresch W.V. (2006)

The solubility of natural, near-end-member wollastonite-I (<99.5% CaSiO3) has been determined at temperatures from 400 to 800 °C and pressures between 0.8 and 5 GPa in piston-cylinder apparatus with the weight-loss method. ...
PLUME ACTIVITY, MAGMATISM, AND THE GEODYNAMIC EVOLUTION OF THE CENTRAL MEDITERRANEAN

Bell K.; Castorina F.; Rosatelli G.; Stoppa F. (2006)

On the basis of isotopic and geochemical data we propose that most of the volcanic activity in Italy is plume rather than subduction related. We suggest that a large plume underlies the Tyrrhenian Sea, extending westwards ...
ISOTOPE AND TRACE ELEMENT EVIDENCE FOR DEPLETED LITHOSPHERE IN THE SOURCE OF ENRICHED KO'OLAU BASALTS

Salters V.J.M.; Sachi-Kocher A.; Bizimis M.; Blichert-Toft J.; Fekiacova Z. (2006)

We have measured the Hf and Nd isotopic compositions of 38 basalts from the Ko'olau drill hole, Hawai'i. The basalts show limited variations in both 176Hf/177Hf and 143 Nd/144Nd (εNd varies from +4.2 to +7.3 and εHf from ...
PARTIAL MELTING EXPERIMENTS OF BIMINERALIC ECLOGITE AND THE ROLE OF RECYCLED MAFIC OCEANIC CRUST IN THE GENESIS OF OCEAN ISLAND BASALTS

Kogiso T.; Hirschmann M.M. (2006)

Bimineralic eclogite, which consists solely of garnet and clinopyroxene, is a likely component of some of the ancient recycled crust residing in basalt source regions. It may originate during subduction of altered mid-ocean ...
FRACTIONATION OF THE NOBLE METALS BY PHYSICAL PROCESSES

Ballhaus C.; Bockrath C.; Wohlgemuth-Ueberwasser C.; Laurenz V.; Berndt J. (2006)

During partial melting in the earth's mantle, the noble metals become fractionated. Os, Ir, Ru, and Rh tend to remain in the mantle residue whereas Pt, Pd, and Re behave mildly incompatible and are sequestered to the ...
GEOLOGY, GEOCHRONOLOGY, AND GEOCHEMISTRY OF BASALTIC FLOWS OF THE CAT HILLS, CAT MESA, WIND MESA, CERRO VERDE, AND MESITA NEGRA, CENTRAL NEW MEXICO

Maldonado F.; Budahn J.R.; Unruh D.M.; Peters L. (2006)

The geochronology, geochemistry, and isotopic compositions of basaltic flows erupted from the Cat Hills, Cat Mesa, Wind Mesa, Cerro Verde, and Mesita Negra volcanic centres in central New Mexico indicate that each of these ...
WHY DYNAMOS ARE PRONE TO REVERSALS

Stefani F.; Gerbeth G.; Günther U.; Xu M. (2006)

In a recent paper [F. Stefani, G. Gerbeth. Asymmetric polarity reversals, bimodal field distribution, and coherence resonance in a spherically symmetric mean-field dynamo model. Phys. Rev. Lett. 94 (2005) 184506] it was ...
EASTERN AUSTRALIA: A POSSIBLE SOURCE OF DUST IN EAST ANTARCTICA INTERGLACIAL ICE

Revel-Rolland M.; Deckker P.De.; Magee J.W.; Delmonte B.; Hesse P.P.; Basile-Doelsch I.; Grousset F.; Bosch D. (2006)

The Australian continent is characterised by an extremely variable surficial geochemistry, reflecting the varied lithology of Australian basement rocks. Samples representative of Australian aeolian dust have been collected ...
MODIFICATION AND PRESERVATION OF ENVIRONMENTAL SIGNALS IN SPELEOTHEMS

Fairchild I.J.; Smith C.L.; Baker A.; Fuller L.; Spötl C.; Mattey D.; McDermott F. (2006)

Speleothems are primarily studied in order to generate archives of climatic change and results have led to significant advances in identifying and dating major shifts in the climate system. However, the climatological ...
WIDESPREAD DROUGHT EPISODES IN THE WESTERN GREAT LAKES REGION DURING THE PAST 2000 YEARS: GEOGRAPHIC EXTENT AND POTENTIAL MECHANISMS

Booth R.K.; Notaro M.; Kutzbach J.E.; Jackson S.T. (2006)

We compared high-resolution reconstructions of peatland water-table depth at two raised bogs in the western Great Lakes region separated by ~ 1000 km. The sites included Minden Bog in southeastern Michigan and Hole-in-the-Bog ...
ESTIMATING BACKGROUND ACTIVITY BASED ON INTEREVENT-TIME DISTRIBUTION

Hainzl S.; Scherbaum F.; Beauval C. (2006)

The statistics of time delays between successive earthquakes has recently been claimed to be universal and to show the existence of clustering beyond the duration of aftershock bursts. We demonstrate that these claims are ...
THE DEVELOPMENT AND REFINEMENT OF CONTINENTAL ARCS BY PRIMARY BASALTIC MAGMATISM, GARNET PYROXENITE ACCUMULATION, BASALTIC RECHARGE AND DELAMINATION: INSIGHTS FROM THE SIERRA NEVADA, CALIFORNIA

Lee C.T.A.; Cheng X.; Horodyskyj U. (2006)

The lower crust of the Mesozoic Sierra Nevada batholith was made up of high MgO, garnet-poor and low MgO, garnet-rich pyroxenites. Both groups are genetically linked and are collectively complementary to the mafic to ...
ENVIRONMENTAL IMPACT OF THE ACID FUMAROLIC PLUME OF A PASSIVELY DEGASSING VOLCANO (VULCANO ISLAND, ITALY)

Fulignati P.; Sbrana A.; Clocchiatti R.; Luperini W. (2006)

This paper investigates the role played by the fumarolic plume of a passive degassing volcano in the genesis of rock coatings (RC) and in the introduction and re-distribution of metals and trace elements in the surficial ...

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