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AN INVESTIGATION OF UPPER MANTLE HETEROGENEITY BENEATH THE ARCHAEAN AND PROTEROZOIC CRUST OF WESTERN CANADA FROM LITHOPROBE CONTROLLED-SOURCE SEISMIC EXPERIMENTS

Gorman A.R.; Németh B.; Clowes R.M.; Hajnal Z. (2006)

Observations of upper mantle reflectivity at numerous locations around the world have been linked to the presence of a heterogeneous distribution of rock types within a broad layer of the upper mantle. This phenomenon is ...

RECONSTRUCTION OF MEGALAKE CHAD USING SHUTTLE RADAR TOPOGRAPHIC MISSION DATA

Leblanc M.; Favreau G.; Leduc C.; Delclaux F.; Lemoalle J.; Maley J.; Nazoumou Y.; Stagnitti F.; van Oevelen P.J. (2006)

In the 2,500,000 km2 Lake Chad Basin in central Africa, the 2000 Shuttle Radar Topographic Mission (SRTM) data have been used to supplement the existing topographic data. SRTM data produce much sharper images of the region's ...

EAST-ASIAN MONSOON VARIABILITY BETWEEN 15 000 AND 2000 CAL. YR BP RECORDED IN VARVED SEDIMENTS OF LAKE SIHAILONGWAN (NORTHEASTERN CHINA, LONG GANG VOLCANIC FIELD)

Schettler G.; Mingram J.; Dulski P.; Liu Q.; Stebich M. (2006)

A palaeohydrological reconstruction on decadal scale for the period 15000-2000 cal. yr BP based on calculated net accumulation rates for biogenic silica (F-bSiO2) and additional proxies (sedimentological data, geochemical ...

THE HETEROGENEOUS UPPER MANTLE LOW VELOCITY ZONE

Thybo H. (2006)

The upper mantle low velocity zone (LVZ) is a depth interval with slightly reduced seismic velocity compared to the surrounding depth intervals. The zone is present below a relatively constant depth of 100 km in most ...

ATTENUATION, TRANSPORT AND DIFFUSION OF SCALAR WAVES IN TEXTURED RANDOM MEDIA

Margerin L. (2006)

Most theoretical investigations of seismic wave scattering rely on the assumption that the underlying medium is statistically isotropic. However, deep seismic soundings of the crust as well as geological observations often ...

INFLUENCE OF GRINDING ON GRAPHITE CRYSTALLINITY FROM EXPERIMENTAL AND NATURAL DATA: IMPLICATIONS FOR GRAPHITE THERMOMETRY AND SAMPLE PREPARATION

Crespo E.; Luque F.J.; Barrenechea J.F.; Rodas M. (2006)

This paper examines the effects of shear stress on the structural parameters that define the 'crystallinity' of graphite. The results show that highly crystalline graphite samples ground for up to 120 min do not undergo ...

1.3 BILLION YEARS OF ACRITARCH HISTORY: AN EMPIRICAL MORPHOSPACE APPROACH

Huntley J.W.; Xiao S.; Kowalewski M. (2006)

Acritarchs are a group of organic-walled vesicular microfossils interpreted as protists, and are among the first eukaryotes preserved in the fossil record. Taxonomic inconsistencies amongst acritarch workers have made it ...

CORRELATIONS IN AFTERSHOCK AND SEISMICITY PATTERNS

Shcherbakov R.; Van Aalsburg J.; Rundle J.B.; Turcotte D.L. (2006)

Correlations in space and time play a fundamental role in earthquake processes. One direct manifestation of the effects of correlations is the occurrence of aftershocks due to the stress transfer in the vicinity of a main ...

VLASOVITE, NA2 ZR (SI4O11), FROM THE KIPAWA ALKALINE COMPLEX, QUEBEC, CANADA: CRYSTAL-STRUCTURE REFINEMENT AND INFRARED SPECTROSCOPY

Sokolova E.; Hawthorne F.C.; Ball N.A.; Mitchell R.H.; Della Ventura G. (2006)

The crystal structure of vlasovite, Na2 Zr (Si4O11, from the Kipawa alkaline complex, Quebec, Canada, monoclinic, a 11.0390(5), b 10.0980(3), c 8.5677(4) Å, β 100.313(1)°, V 939.6(1) Å3, space group C2/c, Z = 4, D (calc.) ...

CALCAREOUS NANNOFOSSIL BIOSTRATIGRAPHY AND MAGNETOSTRATIGRAPHY OF THE UPPER MIOCENE AND LOWER PLIOCENE OF THE NORTHERN AEGEAN (ORPHANIC GULF-STRIMON BASIN AREAS), GREECE

Snel E.; Meulenkamp J.E.; Mǎrunţeanu M. (2006)

The transitional position of the Northern Aegean makes it an important area for studying the relation between the Mediterranean and the Eastern Paratethys. A chronostratigraphic framework has been obtained for the Late ...

CHANGING PERSPECTIVES IN THE CONCEPT OF "LAGO-MARE" IN MEDITERRANEAN LATE MIOCENE EVOLUTION

Orszag-Sperber F. (2006)

The Cenozoic Alpine orogeny caused the partition of Tethys into several basins. During the Late Neogene, the Mediterranean attained its final configuration, whereas, eastwards, the Paratethys, isolated from the World Ocean, ...

COMPARING DIFFERENT MODELS OF AFTERSHOCK RATE DECAY: THE ROLE OF CATALOG INCOMPLETENESS IN THE FIRST TIMES AFTER MAIN SHOCK

Lolli B.; Gasperini P. (2006)

We evaluated the efficiency of various models in describing the time decay of aftershock rate of 47 simple sequences occurred in California (37) from 1933 to 2004 and in Italy (10) from 1976 to 2004. We compared the models ...

CLOSE-UP OF THE END-PERMIAN MASS EXTINCTION HORIZON RECORDED IN THE MEISHAN SECTION, SOUTH CHINA: SEDIMENTARY, ELEMENTAL, AND BIOTIC CHARACTERIZATION AND A NEGATIVE SHIFT OF SULFATE SULFUR ISOTOPE RATIO

Kaiho K.; Chen Z.-Q.; Kawahata H.; Sato H.; Kajiwara Y. (2006)

The Permian/Triassic (P/Tr) boundary beds of the Meishan section, South China, have been re-studied in detail based on complete samples across the P/Tr transition. Under the microscope, the end-Permian mass extinction ...

'PUBLISH OR PERISH:' THE PITFALLS OF DUPLICATE PUBLICATION

Noè L.F.; Batten D.J. (2006)

Duplication of previously published text or figures in the scientific literature without adequate citation is plagiarism or, in the case of an author's own work, self-plagiarism. It breaches the ethical standards that are ...

PLATINUM-PALLADIUM NUGGETS AND MERCURY-RICH PALLADIFEROUS PLATINUM FROM SERRO, MINAS GERAIS, BRAZIL

Cabral A.R.; Beaudoin G.; Choquette M.; Kwitko-Ribeiro R.; Lehmann B.; Polônia J.C. (2006)

Arborescent, botryoidal and reniform grains of platinum and palladium from Córrego Bom Sucesso, Serro, Minas Gerais, Brazil, were investigated by scanning electron microscopy and electron-microprobe analysis. The nuggets ...

THERMAL AND MAGMATIC EVOLUTION OF THE MOON

Shearer C.K.; Borg L.E.; Hess P.C.; Parmentier E.M.; Elkins-Tanton L.T.; Wieczorek M.A.; Pritchard M.E.; Longhi J.; Neal C.R.; Antonenko I.; Canup R.M.; Halliday A.N.; Grove T.L.; Hager B.H.; Lee D.-C.; Wiechert U. (2006)

Thermal models that attempt to explain the asymmetric magmatic evolution of the Moon are still in their infancy. At present, two scenarios seem most plausible for the formation of the Procellarum KREEP Terrane and the long ...

SAZHINITE-(LA), NA3LASI6O15 (H2O)2, A NEW MINERAL FROM THE ARIS PHONOLITE, NAMIBIA: DESCRIPTION AND CRYSTAL STRUCTURE

Cámara F.; Ottolini L.; Devouard B.; Garvie L.A.J.; Hawthorne F.C. (2006)

Sazhinite-(La) is a new mineral from the Axis phonolite, Windhoek, Namibia. It occurs in vesicles within the phonolite, together with other species crystallized from late-stage hydrothermal fluids: natrolite, aegirine, ...

THE TOPOLOGY OF HYDROGEN BONDING IN BRANDTITE, COLLINSITE AND FAIRFIELDITE

Herwig S.; Hawthorne F.C. (2006)

The crystal structures of brandtite [Ca2(Mn,Mg)(AsO4)2 (H2O)2, monoclinic, a 5.877(1), b 12.957(2), c 5.675(1) Å, β 108.00(3)°, V 411.0 Å3, space group P21/c, Z = 2], collinsite [Ca2(Mg,Fe) (PO4)2(H2O)2, triclinic, a ...

FORMATION OF EMERALDS AT PEGMATITE-ULTRAMAFIC CONTACTS BASED ON FLUID INCLUSIONS IN KIANJAVATO EMERALD, MANANJARY DEPOSITS, MADAGASCAR

Vapnik Ye.; Moroz I.; Roth M.; Eliezri I. (2006)

Kianjavato emerald (Mananjary deposits, East coast of Madagascar) was formed during metasomatic processes at the contact between pegmatites and hornblendites. The metasomatic exchange was related to a Pan-African ...

HIGH RESOLUTION CHARACTERIZATION OF THE ASIAN MONSOON BETWEEN 146,000 AND 99,000 YEARS B.P. FROM DONGGE CAVE, CHINA AND GLOBAL CORRELATION OF EVENTS SURROUNDING TERMINATION II

Kelly M.J.; Edwards R.L.; Cheng H.; Yuan D.; Zhang M.; Lin Y.; Cai Y.; An Z. (2006)

Speleothem samples from Hulu (eastern China, 32°30′N, 119°10′E) and Dongge (southern China, 25°17′N, 108°5′E) Caves provide a nearly continuous record of the Asian monsoon over the last 160 ka [Wang, Y.J., Cheng, H., ...

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