Геология России: Recent submissions

Now showing items 701-720 of 41109

TRANSFORMATIONS OF MG- AND CA-SULFATE HYDRATES IN MARS REGOLITH

Vaniman D.T.; Chipera S.J. (2006)

Salt hydrates have an active role in regolith development on Mars. The Mg-sulfate system, with highly variable values of n in the formula MgSO 44·nH2O, is particularly subject to transformations among several crystalline ...
POSSIBLE IMPACT OF THE EARTH'S MAGNETIC FIELD ON THE HISTORY OF ANCIENT CIVILIZATIONS

Gallet Y.; Goff M.Le.; Fluteau F.; Genevey A.; Eshraghi S.A. (2006)

We report new archeointensity results from Iranian and Syrian archeological excavations dated from the second millennium BC. These high-temperature magnetization data were obtained using a laboratory-built triaxial vibrating ...
1300-M-HIGH RISING BUBBLES FROM MUD VOLCANOES AT 2080 M IN THE BLACK SEA: HYDROACOUSTIC CHARACTERISTICS AND TEMPORAL VARIABILITY

Greinert J.; Artemov Y.; Egorov V.; Batist M.De.; McGinnis D. (2006)

A mud volcano area in the deep waters (> 2000 m) of the Black Sea was studied by hydroacoustic measurements during several cruises between January 2002 and June 2004. Gas bubbles in the water column give strong backscatter ...
STRUCTURAL ENVIRONMENT OF IRON IN HYDROUS ALUMINOSILICATE GLASS AND MELT-EVIDENCE FROM X-RAY ABSORPTION SPECTROSCOPY

Wilke M.; Schmidt C.; Farges F.; Malavergne V.; Gautron L.; Simionovici A.; Hahn M.; Petit P.E. (2006)

The iron speciation in hydrous haplotonalitic and haplogranitic silicate glasses was studied using XAFS spectroscopy and transmission electron microscopy (TEM). Spectral features occurring at the main crest of the XANES ...
A STRUCTURAL, INFRARED, AND MöSSBAUER SPECTRAL STUDY OF ROSEMARYITE, NAMNFE3+AL(PO4)3

Hatert F.; Fransolet A.M.; Hermann R.P.; Grandjean F.; Long G.J. (2006)

Rosemaryite, ideally NaMnFe3+Al(PO4)3, has been collected in the Buranga pegmatite, Rwanda. A single-crystal structure refinement was performed to R1 = 4.01 %, in the P21/n space group, with a = 12.001(2), b = 12.396(1), ...
PLATINUM-GROUP ELEMENT, GOLD, SILVER AND BASE METAL DISTRIBUTION IN COMPOSITIONALLY ZONED SULFIDE DROPLETS FROM THE MEDVEZKY CREEK MINE, NORIL'SK, RUSSIA

Barnes S.J.; Cox R.A.; Zientek M.L. (2006)

Concentrations of Ag, Au, Cd, Co, Re, Zn and Platinum-group elements (PGE) have been determined in sulfide minerals from zoned sulfide droplets of the Noril'sk 1 Medvezky Creek Mine. The aims of the study were; to establish ...
CLIMATE CHANGE AND SOLAR VARIABILITY: WHAT'S NEW UNDER THE SUN?

Bard E.; Frank M. (2006)

The Sun has an obvious effect on climate since its radiation is the main energy source for the outer envelopes of our planet. Nevertheless, there is a long-standing controversy on whether solar variability can significantly ...
THE APPLICABILITY OF ACCELERATED SOLVENT EXTRACTION (ASE) TO EXTRACT LIPID BIOMARKERS FROM SOILS

Jansen B.; Nierop K.G.J.; Voogt P.De.; Verstraten J.M.; Kotte M.C. (2006)

We investigated the ability of accelerated solvent extraction (ASE) to extract selected lipid biomarkers (C19-C34 n-alkanes, n-alcohols and n-fatty acids as well as dehydroabietic acid and β-sitosterol) from a sandy soil ...
EFFECTS OF CHEMICAL WEATHERING ON INFRARED SPECTRA OF COLUMBIA RIVER BASALT AND SPECTRAL INTERPRETATIONS OF MARTIAN ALTERATION

Michalski J.R.; Kraft M.D.; Sharp T.G.; Christensen P.R. (2006)

We investigated the mineralogy of basalt weathering rinds and fresh basaltic rocks using visible/near-infrared (VNIR) (λ = 0.4-2.5 μm) and thermal emission (λ = 6-30 μm) spectroscopy to 1) constrain the effects of chemical ...
ENERGETICS OF POTENTIAL HETEROTROPHIC METABOLISMS IN THE MARINE HYDROTHERMAL SYSTEM OF VULCANO ISLAND, ITALY

Rogers K.L.; Amend J.P. (2006)

Values of overall Gibbs free energy of 144 organic oxidation (respiration) and disproportionation (fermentation) reactions are calculated at the temperatures and chemical compositions that exist in nine submarine vents, ...
CHEMICAL DIVIDES AND EVAPORITE ASSEMBLAGES ON MARS

Tosca N.J.; McLennan S.M. (2006)

Assemblages of evaporite minerals record detailed physical and chemical characteristics of ancient surficial environments. Accordingly, newly discovered regions of saline minerals on Mars are high priority targets for ...
HIGH-FIELD-STRENGTH ELEMENTS IN CARBONATITIC ROCKS: GEOCHEMISTRY, CRYSTAL CHEMISTRY AND SIGNIFICANCE FOR CONSTRAINING THE SOURCES OF CARBONATITES

Chakhmouradian A.R. (2006)

Carbonatites and related rocks exhibit a significant variation in their content of high-field-strength elements (HFSE), i.e. Ti, Nb, Ta, Zr and Hf. The average abundances of these elements (calculated for 119 localities ...
TRACE ELEMENT FRACTIONATION AND TRANSPORT IN BOREAL RIVERS AND SOIL POREWATERS OF PERMAFROST-DOMINATED BASALTIC TERRAIN IN CENTRAL SIBERIA

Pokrovsky O.S.; Schott J.; Dupré B. (2006)

The chemical status of ~40 major and trace elements (TE) and organic carbon (OC) in pristine boreal rivers draining the basaltic plateau of Central Siberia (Putorana) and interstitial solutions of permafrost soils was ...
EFFECT OF PH AND ORGANIC LIGANDS ON THE KINETICS OF SMECTITE DISSOLUTION AT 25 °C

Golubev S.V.; Pokrovsky O.S.; Bauer A. (2006)

Forward dissolution rates of Na-Montmorillonite (Wyoming) SWy-2 smectite (Ca0.06Na0.56)[Al3.08Fe(III) 0.38Mg0.54] [Si7.93 Al0.07]O20(OH)4 were measured at 25 °C in a mixed-flow reactor equipped with interior dialysis ...
AN EXPERIMENTAL STUDY OF MAGNESIUM-ISOTOPE FRACTIONATION IN CHLOROPHYLL-A PHOTOSYNTHESIS

Black J.R.; Casey W.H.; Yin Q.Z. (2006)

Measurements are presented of the magnesium isotopic composition of chlorophyll-a, extracted from cyanobacteria, relative to the isotopic composition of the culture medium in which the cyanobacteria were grown. Yields of ...
GIS-BASED MODELLING OF ROCK-ICE AVALANCHES FROM ALPINE PERMAFROST AREAS

Noetzli J.; Huggel C.; Hoelzle M.; Haeberli W. (2006)

Changing permafrost conditions caused by present atmospheric warming are expected to affect the stability of steep rock walls in high mountain areas. The possible increase in periglacial slope instabilities and the especially ...
NATURE AND EVOLUTION OF LATE CRETACEOUS LITHOSPHERIC MANTLE BENEATH THE EASTERN NORTH CHINA CRATON: CONSTRAINTS FROM PETROLOGY AND GEOCHEMISTRY OF PERIDOTITIC XENOLITHS FROM JüNAN, SHANDONG PROVINCE, CHINA

Ying J.; Zhang H.; Kita N.; Morishita Y.; Shimoda G. (2006)

Mantle xenoliths entrained in a newly discovered Late Cretaceous basaltic breccia at Jünan, Shandong Province, China provide important constraints on the nature and evolution of the Late Mesozoic lithospheric mantle beneath ...
THE OXIDATION STATES OF COPPER AND IRON IN MINERAL SULFIDES, AND THE OXIDES FORMED ON INITIAL EXPOSURE OF CHALCOPYRITE AND BORNITE TO AIR

Goh S.W.; Buckley A.N.; Lamb R.N.; Rosenberg R.A.; Moran D. (2006)

Metal L2,3, sulfur K and oxygen K near-edge X-ray absorption fine structure (NEXAFS) spectra for chalcopyrite, bornite, chalcocite, covellite, pyrrhotite and pyrite have been determined from single-piece natural mineral ...
TRACE ELEMENT DISTRIBUTION IN PERIDOTITE XENOLITHS FROM TOK, SE SIBERIAN CRATON: A RECORD OF PERVASIVE, MULTI-STAGE METASOMATISM IN SHALLOW REFRACTORY MANTLE

Ionov D.A.; Merlet C.; Bodinier J.L.; Chazot G.; Chauvel C. (2006)

Spinel peridotite xenoliths in alkali basalts at Tok, SE Siberian craton range from fertile lherzolites to harzburgites and wehrlites; olivine-rich (70-84%) rocks are dominant. REE patterns in the lherzolites range from ...
NEW CONSTRAINTS ON THE LITHIUM ISOTOPE COMPOSITIONS OF THE MOON AND TERRESTRIAL PLANETS

Magna T.; Wiechert U.; Halliday A.N. (2006)

High-precision lithium (Li) isotope data are reported for samples from the Earth, Moon, Mars and Vesta and provide evidence of broadly similar compositions that are slightly heavy relative to those of chondrites. Mare ...

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