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Now showing items 7513-7532 of 26297

IN SEARCHING FOR GLOBAL STRATOTYPE SECTIONS AND POINTS OF THE TRIASSIC STAGE BOUNDARIES

Shevyrev A.A. (2003)
IN SITU AFM STUDY OF THE DISSOLUTION AND RECRYSTALLIZATION BEHAVIOUR OF POLISHED AND STRESSED CALCITE SURFACES

Bisschop J.; Dysthe D.K.; Putnis C.V.; Jamtveit B. (2006)

We investigated the dissolution behaviour of polished calcite surfaces in situ using a fluid-cell atomic force microscope. Polished calcite surfaces enabled us to study the effects of applied surface stress and crystallographic ...
IN SITU ATOMIC FORCE MICROSCOPE OBSERVATIONS OF A DISSOLUTION-CRYSTALLISATION REACTION: THE PHOSGENITE-CERUSSITE TRANSFORMATION - THEORY, EXPERIMENT, AND APPLICATIONS

Pina C.M.; Fernandez-Daz L.; Prieto M.; Putnis A. (2000)

The dissolution-reprecipitation reaction of phosgenite (Pb2Cl2CO3) to cerussite (PbCO3) has been observed in situ in a fluid cell of an atomic force microscope (AFM). The (001) face of phosgenite, in contact with static ...
IN SITU CHARACTERIZATION OF MN(II) OXIDATION BY SPORES OF THE MARINE BACILLUS SP. STRAIN SG-1

Bargar J.R.; Tebo B.M.; Villinski J.E. (2000)

Microbial oxidation of Mn(II) and subsequent precipitation of insoluble, reactive Mn(IV) oxides are primary sources of these solid phases in the environment and key controls on Mn cycling in natural waters. We have performed ...
IN SITU EVALUATION OF SHEAR-WAVE VELOCITIES IN SEAFLOOR SEDIMENTS WITH A BROADBAND OCEAN-BOTTOM SEISMOGRAPH

Huerta-Lopez C.; Pulliam J.; Nakamura Y. (2003)

We present an in situ evaluation of the response of seafloor sediments to passive dynamic loads. Horizontal-to-vertical (H/V) spectral ratios are used to characterize local sediment response, and ID wave propagation modeling ...
IN SITU FRACTIONAL CRYSTALLIZATION OF A MAFIC PLUTON: MICROANALYTICAL STUDY OF A PALAEOGENE GABBRONORITE PLUG IN EAST GREENLAND

Bernstein S. (2006)

Spot analysis techniques have been used to unravel crystallization processes in a Palaeogene coarse-grained, olivine-bearing, gabbronoritic plug from East Greenland. Whole-rock analyses of the gabbronorite and its chilled ...
IN SITU FTIR STUDY ON THE DEHYDRATION OF NATURAL GOETHITE

Prasad P.S.R.; Shiva Prasad K.; Babu E.V.S.S.K.; Krishna Chaitanya V.; Sreedhar B.; Ramana Murthy S. (2006)

Fourier Transform Infrared (FTIR) spectroscopy, thermal analysis -Differential Scanning Calorimetry (DSC) and Thermo-Gravimetry (TG-DTG) were used to study the dehydration behavior of synthetic goethite and two naturally ...
IN SITU HIGH-PRESSURE AND HIGH-TEMPERATURE BUBBLE GROWTH IN SILICIC MELTS

Martel C.; Bureau H. (2001)

We present the first investigation of in situ high-pressure and high-temperature bubble growth in silicic melts. In a hydrothermal diamond-anvil cell, a haplogranite melt (79 wt% SiO2) is hydrated then subjected to cooling ...
IN SITU INVESTIGATION OF DISSOLUTION OF HEAVY METAL CONTAINING MINERAL PARTICLES IN AN ACIDIC FOREST SOIL

Birkefeld A.; Schulin R.; Nowack B. (2006)

We report the application of an in situ method to obtain field dissolution rates of fine mineral particles in soils. Samples with different metal-containing mineral and slag particles (lead oxide, copper concentrate and ...
IN SITU INVESTIGATION OF GALENA DISSOLUTION IN OXYGEN SATURATED SOLUTION: EVOLUTION OF SURFACE FEATURES AND KINETIC RATE

De Giudici G.; Zuddas P. (2001)

In this work, an original Atomic Force Microscopy (AFM) investigation was carried out combining in situ microtopography measurements with solution chemistry. The dissolution of galena (PbS) surface in acidic (HCl, pH = 1) ...
IN SITU IRON ISOTOPE RATIO DETERMINATION USING UV-FEMTOSECOND LASER ABLATION WITH APPLICATION TO HYDROTHERMAL ORE FORMATION PROCESSES

Horn I.; von Blanckenburg F.; Schoenberg R.; Steinhoefel G.; Markl G. (2006)

The feasibility of in situ stable Fe isotope ratio measurements using UV-femtosecond laser ablation connected to a multiple-collector inductively coupled plasma mass spectrometer (MC-ICP-MS) has been investigated. Different ...
IN SITU MEASUREMENT OF VISCOSITY OF LIQUIDS IN THE FE-FES SYSTEM AT HIGH PRESSURES AND TEMPERATURES

Dobson D.P.; Crichton W.A.; Vocadlo L.; Jones A.P.; Wang Y.; Uchida T.; Rivers M.; Sutton S.; Brodholt J.P. (2000)

The viscosity of liquid FeS and Fe-FeS eutectic was measured at pressures between 0.5 and 5.0 GPa using a synchrotron-based falling sphere technique. We obtain viscosities of 2 × 10−2 to 4 × 10−3 Pa-s in FeS at 1450 to ...
IN SITU MEASUREMENTS OF THE PHASE TRANSITION BOUNDARY IN MG3AL2SI3O12: IMPLICATIONS FOR THE NATURE OF THE SEISMIC DISCONTINUITIES IN THE EARTH'S MANTLE

Hirose K.; Fei Y.; Ono S.; Yagi T.; Funakoshi K.I. (2001)

Here we report the phase boundary of pyrope garnet (Mg3Al2Si3O12) to Al-bearing silicate perovskite plus corundum, with the highest transition pressure determined by in situ measurements in a multi-anvil apparatus at high ...
IN SITU NEUTRON DIFFRACTION ANALYSIS OF THE INFLUENCE OF GEOMETRIC CONFINEMENT ON CRYSTALLINE SWELLING OF MONTMORILLONITE

Devineau K.; Bihannic I.; Michot L.; Villiéras F.; Masrouri F.; Cuisinier O.; Fragneto G.; Michau N. (2006)

The swelling properties of a bentonite MX-80 and a Na montmorillonite obtained from MX-80 purification were analyzed as a function of relative humidity in free and constrained conditions. Gravimetric and XRD techniques ...
IN SITU OXYGEN ISOTOPE ANALYSIS WITH AN EXCIMER LASER USING F2 AND BRF5 REAGENTS AND O2 GAS AS ANALYTE

Rumble D.; Farquhar J.; Young E.D.; Christensen C.P. (1997)

In situ oxygen isotope analysis of silicate minerals has been validated by interlaboratory calibration using an excimer laser (KrF fill gas, 248 nm), F2 gas fluorinating reagent, and O2 gas as mass spectrometer analyte. A ...
IN SITU PB GEOCHRONOLOGY OF ZIRCON WITH LASER ABLATION-INDUCTIVELY COUPLED PLASMA-SECTOR FIELD MASS SPECTROMETRY

Tiepolo M. (2003)

The in situ Pb geochronological capabilities of a laser ablation-inductively coupled plasma-mass spectrometer (LA-ICP-MS) coupling a magnetic sector ICP-MS with a Nd:YAG laser probe working at 213 nm have been tested on ...
IN SITU PRODUCED 10BE MEASUREMENTS AT GREAT DEPTHS: IMPLICATIONS FOR PRODUCTION RATES BY FAST MUONS

Braucher R.; Brown E.T.; Bourles D.L.; Colin F. (2003)

In situ cosmogenic 10Be values have been used to investigate a Brazilian quartz vein from the surface to a depth of 15 m. At depths greater than 1000 g/cm2, deep enough for neutron-induced reactions to be insignificant, ...
IN SITU PRODUCTION OF ALPHA PARTICLES AND ALPHA RECOIL PARTICLES IN QUARTZ APPLIED TO ESR STUDIES OF OXYGEN VACANCIES

Toyoda S.; Rink W.J.; Yonezawa C.; Matsue H.; Kagami T. (2001)

The intensity of an ESR signal associated with oxygen vacancies in quartz (E1' center and heat-treated E1' center) are correlated with the radiometric age of their host rocks. Two natural processes are responsible for the ...
IN SITU RAMAN SPECTROSCOPIC STUDY OF SULFUR-SATURATED WATER AT 1000 BAR BETWEEN 200 AND 500°C

Bondarenko G.V.; Gorbaty Yu.E. (1997)

Raman spectra of a hydrothermal fluid, interacting with elementary sulfur, have been measured in the temperature range from 200 up to 500°C at a constant pressure of 1000 bar. The main products of the interaction are H2S, ...
IN SITU SENSING OF METHANE EMISSIONS FROM NATURAL MARINE HYDROCARBON SEEPS: A POTENTIAL REMOTE SENSING TECHNOLOGY

Leifer I.; Roberts D.; Margolis J.; Kinnaman F. (2006)

The sources and sinks of methane, an important greenhouse gas, are poorly constrained. Remote sensing techniques can significantly improve our understanding of the global methane budget. Field and laboratory studies using ...

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