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CONVENTIONAL AND IN SITU GEOCHRONOLOGY OF THE TEPLÁ CRYSTALLINE UNIT, BOHEMIAN MASSIF: IMPLICATIONS FOR THE PROCESSES INVOLVING MONAZITE FORMATION

Timmermann H.; Dörr W.; Krenn E.; Finger F.; Zulauf G. (2006)

The Teplá Crystalline unit (TCU), western Bohemian Massif, proves highly suitable for studying the effects of differential metamorphic reworking on the U–Th–Pb systematics in monazite, as the overprint of Variscan regional ...

CONVERGENCE RATE-DEPENDENT GROWTH OF EXPERIMENTAL VISCOUS OROGENIC WEDGES

Rossetti F.; Faccenna C.; Ranalli G.; Storti F. (2000)

The effects of convergence rate variations on the evolution of mature orogenic wedges are investigated using temperature-dependent variations in the viscosity of paraffin as an analogue for the natural strength distribution ...

CONVERGENT MORPHOLOGY IN SMALL SPIRAL WORM TUBES ('SPIRORBIS') AND ITS PALAEOENVIRONMENTAL IMPLICATIONS

Taylor P.D.; Vinn O. (2006)

Calcareous tube-worms generally identified as Spirorbis range from Ordovician to Recent, often profusely encrusting shells and other substrates. Whereas Recent Spirorbis is a polychaete annelid, details of tube structure ...

CONVERSION OF HEAD-WAVE FIELDS BY THE WIENER FILTERS

Seleznev V.S.; Emanov A.F. (1998)

CONVERSION OF KYANITE (AL2SIO5) TO CORUNDUM (AL2O3) AND SIO2

Ponomarenko A.I. (1988)

Ecologite, consisting of kyanite garnet, clinopyroxene and accessory rutile, coesite and diamond was repeatedly subjected to high dynamic loads, under which it underwent considerable changes, manifested in granulation, ...

CONVERTED-WAVE MOVEOUT AND CONVERSION-POINT EQUATIONS IN LAYERED VTI MEDIA: THEORY AND APPLICATIONS

Li X.Y.; Yuan J. (2003)

We have developed improved equations for calculating the conversion point of the P-SV converted wave (C-wave) in transversely isotropic media with a vertical symmetry axis (vertical transverse isotropy (VTI)). We have also ...

COOLING BEHAVIOUR OF PARTIAL THERMOREMANENCES INDUCED IN MULTIDOMAIN MAGNETITE

Muxworthy A.R. (2000)

The cooling behaviour of partial thermoremanences (pTRMs) below the acquisition temperature (T2) is reported for the first time for well defined, sized, synthetic multidomain magnetite samples produced by hydrothermal ...

COOLING HISTORY OF LUNAR MG-SUITE GABBRONORITE 76255, TROCTOLITE 76535 AND STILLWATER PYROXENITE SC-936: THE RECORD IN EXSOLUTION AND ORDERING IN PYROXENES

McCallum I.S.; Domeneghetti M.C.; Schwartz J.M.; Mullen E.K.; Zema M.; C?mara F.; McCammon C.; Ganguly J. (2006)

We have determined cooling rates of orthopyroxene crystals from two Mg-suite lunar samples (gabbronorite 76255 and troctolite 76535) and one terrestrial sample (orthopyroxenite SC-936 from the Stillwater Complex), on the ...

COOLING RATE CORRECTION OF PALEOINTENSITY DETERMINATION FOR VOLCANIC GLASSES BY RELAXATION GEOSPEEDOMETRY

Leonhardt R.; Matzka J.; Nichols A.R.L.; Dingwell D.B. (2006)

The influence of the cooling rate on paleointensity estimates was investigated for samples from a vertical profile across a 600 A.D. obsidian lava flow ramp from Lipari, Italy. The natural cooling rates at the glass ...

COOLING RATE EFFECTS ON THE MAGNETIZATION OF VOLCANIC ROCKS: SOME IMPLICATIONS FOR PALEOINTENSITY DETERMINATION

Morales J.; Goguitchaichvili A.; Urrutia-Fucugauchi J. (2006)

Effects of variation of cooling rate in the acquisition of thermoremanent magnetization (TRM) are analyzed on a suite of volcanic rocks. We use a three-step cooling rate experimental procedure applied at three distinct ...

COOLING RATES OF HYALOCLASTITES: APPLICATIONS OF RELAXATION GEOSPEEDOMETRY TO UNDERSEA VOLCANIC DEPOSITS

Wilding M.; Dingwell D.; Batiza R.; Wilson L. (2000)

Glass fragments from three different hyaloclastites have been used to evaluate the range of cooling rates experienced by undersea volcanic deposits. We found that the glass fragments retain structures with a range of ...

COORDINATION AND VALENT STATE OF NICKEL IONS IN BERYL AND CHRYSOBERYL CRYSTALS

Solntsev V.P.; Tsvetkov E.G.; Alimpiev A.I.; Mashkovtsev R.I. (2006)

We have studied the polarized optical absorption and the EPR spectra of Ni-doped beryls grown by hydrothermal, flux and gas-transport methods, and chrysoberyl grown by the Czochralski and flux methods. In beryls, three ...

COORDINATION CHEMISTRY OF TI(IV) IN SILICATE GLASSES AND MELTS: I. XAFS STUDY OF TITANIUM COORDINATION IN OXIDE MODEL COMPOUNDS

Farges F.; Brown G.E.; Rehr J.J. (1996)

The coordination environment of Ti(IV) in a variety of Ti-bearing crystalline oxide and silicate model compounds has been studied using Ti K-edge x-ray absorption fine structure (XAFS) spectroscopy at ambient temperature ...

COORDINATION CHEMISTRY OF TI(IV) IN SILICATE GLASSES AND MELTS: II. GLASSES AT AMBIENT TEMPERATURE AND PRESSURE

Farges F.; Brown G.E.; Navrotsky A.; Hao G.; Rehr J.J. (1996)

The coordination environment of Ti(IV) in a number of Ti-silicate and Ti-aluminosilicate glasses has been determined by x-ray absorption fine structure (XAFS) spectroscopy at the Ti K-edge at ambient temperature and pressure. ...

COORDINATION CHEMISTRY OF TI(IV) IN SILICATE GLASSES AND MELTS: III. GLASSES AND MELTS FROM AMBIENT TO HIGH TEMPERATURES

Farges F.; Brown G.E.; Navrotsky A.; Hao G.; Rehr J.R. (1996)

The local structural environment of Ti in five Na-, K-, and Ca-titanosilicate glass/melts with TiO2 concentrations ranging from 2.7-30.5 wt% has been determined by in situ Ti K-edge x-ray absorption fine structure (XAFS) ...

COORDINATION CHEMISTRY OF TITANIUM (IV) IN SILICATE GLASSES AND MELTS: IV. XANES STUDIES OF SYNTHETIC AND NATURAL VOLCANIC GLASSES AND TEKTITES AT AMBIENT TEMPERATURE AND PRESSURE

Farges F.; Brown G.E. (1997)

The coordination environment of Ti(IV) in seven natural and synthetic glasses of basaltic, trachytic, rhyolitic composition as well as four tektites has been studied using high-resolution Ti K-edge x-ray absorption near ...

COORDINATION OF ACETATE TO AL(III) IN AQUEOUS SOLUTION AND AT THE WATER-ALUMINUM HYDROXIDE INTERFACE: A POTENTIOMETRIC AND ATTENUATED TOTAL REFLECTANCE FTIR STUDY - V. GIBBSITE SOLUBILITY AT 50OC AND PH 3-9 IN 0.1 MOLAL NACL SOLUTIONS (A GENERAL MODEL FOR ALUMINUM SPECIATION; ANALYTICAL METHODS)

Persson P.; Karlsson M.; Ohman L.O. (1998)

Attenuated total reflectance FTIR spectroscopy was used to characterize Al(III)-acetate complexation at 25°C, in homogeneous aqueous solution and at the water-aluminum hydroxide interface. The data collected in aqueous ...

COPPER ADSORPTION ON γ-AL2O3 FROM SULFATE FLUIDS

Fedoseeva V.I.; Bereznyaya E.V. (2001)

COPPER IN THE MAIN COMPONENTS OF WESTERN TRANSBAIKALIA LANDSCAPES

Ivanov G.M.; Kashin V.K.; Ubugunov V.L. (2006)

Copper content was analyzed in the parent rocks, soils, natural waters, and plants of the taiga and steppe terrains of Transbaikalia. The concentration of copper appeared to be low in the taiga terrains compared with the ...

COPPER ISOTOPES AS MONITORS OF REDOX PROCESSES IN HYDROTHERMAL MINERALIZATION

Markl G.; Schwinn G.; Lahaye Y. (2006)

The stable copper isotope composition of 79 samples of primary and secondary copper minerals from hydrothermal veins in the Schwarzwald mining district, South Germany, shows a wide variation in δ65Cu ranging from -2.92 to ...

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