Browsing ELibrary by Title

P AND S TOMOGRAPHY USING NORMAL-MODE AND SURFACE WAVES DATA WITH A NEIGHBOURHOOD ALGORITHM

Beghein C.; Resovsky J.S.; Trampert J. (2002)

Traditionally P - and S -wave tomography has been based on the inversion of data that are sensitive to the desired Earth structure, and model covariance is estimated from imperfect resolution and data error propagation. ...

P WAVE AMPLITUDES IN A 3-D EARTH

Tibuleac I.M.; Nolet G.; Caryl M.; Koulakov I. (2003)

Evidence is presented here that P wave amplitudes contain additional information on the Earth's heterogeneity and must be considered in future tomographic interpretations. We analyse the reliability and the variance of ...

P-S CONVERTED WAVE: CONVERSION POINT AND ZERO-OFFSET ENERGY IN ANISOTROPIC MEDIA

Artola F.A.V.; Leiderman R.; Fontoura S.A.B.; Silva M.B.C. (2004)

Here, we analyze two aspects related to converted-wave seismology: the conversion point problem and the zero-offset energy phenomenon. We show the anisotropy effect on the conversion point position and evaluate the error ...

P-T HISTORY OF GARNET-WEBSTERITES IN THE SHARYZHALGAI COMPLEX, SOUTHWESTERN MARGIN OF SIBERIAN CRATON: EVIDENCE FOR PALEOPROTEROZOIC HIGH-PRESSURE METAMORPHISM

Ota T.; Gladkochub D.P.; Sklyarov E.V.; Mazukabzov A.M.; Watanabe T. (2004)

The Saramta massif in the Paleoproterozoic Sharyzhalgai complex, the southwestern margin of the Siberian craton, is mainly composed of spinel-peridotites with garnet-websterites; it is enclosed within granitic gneisses and ...

P-T PATHS AND TECTONIC EVOLUTION OF SHEAR ZONES SEPARATING HIGH-GRADE TERRAINS FROM CRATONS: EXAMPLES FROM KOLA PENINSULA (RUSSIA) AND LIMPOPO REGION (SOUTH AFRICA)

Perchuk L.L.; Gerya T.V.; Krotov A.V.; Reenen D.D.V.; Smit C.A. (2000)

Two metamorphic zones are identified in strongly deformed mica schists from the 1.9 Ga Korva Tundra Group of the Tanaelv belt: (1) a chlorite-staurolite zone tectonically overlaying gneisses of the Karelian craton, and (2) ...

P-T PHASE RELATIONS OF SILICIC, ALKALINE, ALUMINOUS LIQUIDS: NEW RESULTS AND APPLICATIONS TO MANTLE MELTING AND METASOMATISM

Draper D.S.; Green T.H. (1999)

We report new experimental results obtained under nominally anhydrous conditions at 1.0-1.5 GPa on a synthetic melt whose composition is typical of extreme-composition xenolith glasses. These results demonstrate that part ...

P-T PHASE RELATIONS OF SILICIC, ALKALINE, ALUMINOUS MANTLE-XENOLITH GLASSES UNDER ANHYDROUS AND C-O-H FLUID-SATURATED CONDITIONS

Draper D.S.; Green T.H. (1997)

High-pressure liquidus experiments on three silicic, aluminous, alkaline melts, modelled on glasses found in many mantle xenoliths, show that part of this compositional range is saturated with harzburgite (or possibly ...

P-T STABILITY OF THE LAZULITE-SCORZALITE SOLID-SOLUTION SERIES

Schmid-Beurmann P.; Knitter St.; Cemic L. (2000)

The stability of members of the lazulite-scorzalite solid-solution series, (Mg,Fe)Al2 (OH)2(PO4)2, was investigated as a function of T (505 to 675 °C), P (0.1 to 0.3 GPa) and Fe/Mg ratio in hydrothermal synthesis experiments. ...

P-T-T-DEFORMATION-FLUID CHARACTERISTICS OF LODE GOLD DEPOSITS: EVIDENCE FROM ALTERATION SYSTEMATICS

McCuaig T.C.; Kerrich R. (1998)

Structurally hosted lode gold-bearing quartz vein systems in metamorphic terranes possess many characteristics in common, spatially and through time; they constitute a single class of epigenetic precious metal deposit, ...

P-T-X DATA ON P21/C-CLINOPYROXENES AND THEIR DISPLACIVE PHASE TRANSITIONS

Arlt T.; Kunz M.; Stolz Ja.; Armbruster T.; Angel R.J. (2000)

The P21/c clinopyroxene kanoite (ideally MnMgSi2O6) was studied as a function of pressure and temperature using powder X-ray diffraction, differential scanning calorimetry (DSC) and optical methods. The temperature of the ...

P-WAVE ANISOTROPY IN THE LOWER LITHOSPHERE

Bean C.J.; Jacob A.W.B. (1990)

Long-range controlled source seismic experiments yield detailed information about the velocity depth structure of the lower lithosphere. Between Ireland and Northern Britain three such profiles sample almost the same portion ...

P-WAVE VELOCITIES OF POLYMINERALIC ROCKS: COMPARISON OF THEORY AND EXPERIMENT AND TEST OF ELASTIC MIXTURE RULES

Ji S.; Xia B.; Wang Q. (2003)

We compare the P-wave velocities (Vp) of 696 dry samples measured at pressures up to 0.6–1.0 GPa with values calculated from the volume fraction and room pressure elastic constants of each constituent mineral using 16 ...

PACIFIC MICROPLATE AND THE PANGEA SUPERCONTINENT IN THE EARLY TO MIDDLE JURASSIC

Bartolini A.; Larson R.L. (2001)

New biostratigraphic data based on radiolarians recovered from deep within the oceanic crustal section of Ocean Drilling Program Hole 801C in the western Pacific, along with existing radiometric information, date this ...

PACIFIC PLATE MOTION AND UNDULATIONS IN GEOID AND BATHYMETRY

Wessel P.; Kroenke L.W.; Bercovici D. (1996)

Previous studies have shown that the Pacific geoid and gravity fields exhibit lineated anomalies, trending approximately in the direction of absolute plate motion over the underlying mantle. Because the undulations obliquely ...

PACKAGE FLUIDS 1. COMPUTER PROGRAMS FOR ANALYSIS OF FLUID INCLUSION DATA AND FOR MODELLING BULK FLUID PROPERTIES

Bakker R.L. (2003)

The computer package FLUIDS contains five sets of computer programs written in C++ for the calculation of fluid properties. Both model fluids and data from fluid inclusions can be analysed in the programs. Bulk density, ...

PALAEO-DIGITAL ELEVATION MODELS FOR USE AS BOUNDARY CONDITIONS IN COUPLED OCEAN - ATMOSPHERE GCM EXPERIMENTS: A MAASTRICHTIAN (LATE CRETACEOUS) EXAMPLE

Markwick P.J.; Valdes P.J. (2004)

Palaeogeography (specifically palaeotopography and palaeobathymetry) provides an essential boundary condition for computer-based atmosphere and ocean modelling. It also provides the geographic context for understanding ...

PALAEOCLIMATE INDICATORS (CLAY MINERALS, CALCAREOUS NANNOFOSSILS, STABLE ISOTOPES) COMPARED FROM TWO SUCCESSIONS IN THE LATE JURASSIC OF THE VOLGA BASIN (SE RUSSIA)

Ruffell A.H.; Price G.D.; Mutterlose J.; Kessels K.; Baraboshkin E.; Gröcke D.R. (2002)

A study of clay mineral and calcareous nannofossil abundances in late Jurassic–early Cretaceous sediments from the Volga Basin, SE Russia, is presented. From these results, we are able to compare some general patterns of ...

PALAEODINOPHYSIS GEN. ET SP.N. FROM THE DEVONIAN OF THE RUDNYY ALTAY (A UNIQUE FIND OF DINOFLAGELLATE FOSSILS)

Vozzhenikova T.F.; Sheshegova L.I. (1989)

While studying acritarchs from the Rudnyy Altay, we the authors discovered one cyst of a dinophyte alga whose structure provides evidence for its taxonomic membership in the order Dinophysiales. Morphologically, the cyst ...

PALAEOECOLOGY AND EVOLUTION OF MARINE HARD SUBSTRATE COMMUNITIES

Taylor P.D.; Wilson M.A. (2003)

Marine organisms have occupied hard substrates since the Archaean. Shells, rocks, wood and sedimentary hardgrounds offer relatively stable habitats compared to unconsolidated sediments, but the plants and animals which ...

PALAEOENVIRONMENT AND ECOLOGY OF THE MIDDLE CRETACEOUS GREBENKA FLORA OF NORTHEASTERN ASIA

Spicer R.A.; Ahlberg A.; Herman A.B.; Kelley S.P.; Raikevich M.I.; Rees P.M. (2002)

The Grebenka flora, from the main exposure of the Albian–Cenomanian Krivorechenskaya Formation in northeastern Russia, represents a range of plant communities from pioneer to mature forest that grew close to the mid-Cretaceous ...

Browsing ELibrary by Title

Browsing ELibrary by Title

Search DSpace

Browse

All of DSpace

This Collection

My Account