Browsing ELibrary by Title

Browsing ELibrary by Title

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  • WEATHERING OF SMECTITE AND ILLITE-SMECTITE UNDER TEMPERATE CLIMATIC CONDITIONS 
    Šucha V.; Środoń J.; Clauer N.; Elsass F.; Eberl D.D.; Kraus I.; Madejová J. (2001)
    Weathering profiles developed on the top surface of a bentonite (containing Al-Mg montmorillonite) and a K-bentonite (containing mixed-layer illite-smectite (I-S)) under Central European temperate conditions were studied ...
  • WEATHERING OF THE OPORTO GRANITE: GEOTECHNICAL AND PHYSICAL PROPERTIES 
    Begonha A.; Sequeira Braga M.A. (2002)
    This paper characterizes the weathering products of the two-mica Oporto granite in terms of its mineralogical, chemical, geotechnical and physical properties. This information is used to identify a physical property that ...
  • WEATHERING: TOWARD A FRACTAL QUANTIFYING 
    Oleschko K.; Parrot J.F.; Ronquillo G.; Shoba S.A.; Stoops G.; Marcelino V. (2004)
    Weathering occurs over a wide range of scales. To link features through these scales is a major challenge for interdisciplinary weathering studies. Fractal approach seems to be specially useful for this purpose. We introduce ...
  • WEDGE STABILITY ANALYSIS CONSIDERING DILATANCY OF DISCONTINUITIES 
    Wang Y.J.; Yin J.H. (2002)
    A method for the calculation of the factor of safety by using the limit equilibrium method and considering the dilatancy of discontinuities on which the wedge rests is addressed. The direction of shear force on each ...
  • WEICHSELIAN GLACIATION OF THE TAYMYR PENINSULA, SIBERIA 
    Hjort C.; Möller P.; Alexanderson H. (2004)
    During recent years there has been a re-assessment of the glacial history of the Russian Arctic, from the Kola Peninsula in the west to the Lena Delta and beyond in the east. In this context, work has been carried out on ...
  • WELLSKINS AND SLUG TESTS: WHERE'S THE BIAS? 
    Rovey C.W.; Niemann W.L. (2001)
    Pumping tests in an outwash sand at the Camp Dodge Site give hydraulic conductivities (K) approximately seven times greater than conventional slug tests in the same wells. To determine if this difference is caused by skin ...
  • WEST SIBERIAN AREA OF SCATTERED TEKTITE-LIKE GLASSES 
    Masaytis V.L.; Ivanov M.A.; Yezerskiy V.A.; Koslov V.S.; Reshetnyak N.B. (1989)
    Unusual glass pebbles and fragments were found in northwestern Siberia several years ago and studied by us after our geologic and geomorphic survey of the localities. Our assumption that these glasses are tektites predetermined ...
  • WESTERN GONDWANA, EASTERN GONDWANA AND THE PROTOTETHYS AT THE END OF THE PRECAMBRIAN - BEGINNING OF THE PALAEOZOIC 
    Khain V.Ye.; Rudakov S.G. (1996)
    The paper discusses the history of East Gondwana and its relationship with West Gondwana in the period preceding the collision, and with the Prototethys. The relationships between East and West Gondwana and the Prototethys ...
  • WETTABILITY EFFECTS ON OIL-RECOVERY MECHANISMS IN FRACTURED RESERVOIRS 
    Graue A.; Bognø T.; Baldwin B.A.; Spinier E.A. (2001)
    Iterative comparison between experimental work and numerical simulations has been used to predict oil-recovery mechanisms in fractured chalk as a function of wettability. Selective and reproducible alteration of wettability ...
  • WETTING OF MANTLE OLIVINE BY SULFIDE MELT: IMPLICATIONS FOR RE/OS RATIOS IN MANTLE PERIDOTITE AND LATE-STAGE CORE FORMATION 
    Gaetani G.A.; Grove T.L. (1999)
    This study investigates the effects of variations in the relative fugacities of oxygen and sulfur on the wetting of mantle olivine by molten sulfide. Experiments were performed on mixtures of San Carlos olivine and synthetic ...
  • WHAT CAN GPS DATA TELL US ABOUT THE DYNAMICS OF POST-SEISMIC DEFORMATION? 
    Hearn E.H. (2003)
    This paper describes differences in time-varying post-seismic deformation due to after-slip and viscoelastic relaxation following large strike-slip earthquakes, and how these differences may be exploited to characterize ...
  • WHAT CONSTITUTES 'EMPLACEMENT' OF AN OPHIOLITE?: MECHANISMS AND RELATIONSHIP TO SUBDUCTION INITIATION AND FORMATION OF METAMORPHIC SOLES 
    Wakabayashi J.; Dilek Y. (2004)
    Ophiolites have long been recognized as on-land fragments of fossil oceanic lithosphere, which becomes an ophiolite when incorporated into continental margins through a complex process known as ' emplacement '. A fundamental ...
  • WHAT CRITICALITY IN CELLULAR AUTOMATA MODELS OF EARTHQUAKES? 
    Castellaro S.; Mulargia F. (2002)
    Six different 2-D prototype cellular automata models are developed to analyse the main variants of the massless automata proposed so far to reproduce earthquake physics. The analysis aims at identifying the existence of ...
  • WHAT DETERMINES SEDIMENTARY CS RATIOS? 
    Morse J.W.; Berner R.A. (1995)
    The weight ratio of organic carbon to pyrite sulfur (CS) has been observed to fall within a relatively narrow range (2.8 +/- 0.8) in most fine-grained normal marine siliciclastic sediments. Although an increasing number ...
  • WHAT DROVE LATE MESOZOIC EXTENSION OF THE NORTHERN CHINA-MONGOLIA TRACT? 
    Meng Q.-R. (2003)
    The northern China–Mongolia tract exhibited a tectonic transition from contractional to extensional deformation in late Mesozoic time. Late Middle to early Late Jurassic crustal shortening is widely thought to have resulted ...
  • WHAT FACTORS CONTROL MECHANICAL EROSION RATES? 
    Harrison C.G.A. (2000)
    Mechanical erosion rates are important factors in understanding how continents evolve. Mechanical erosion is much faster than chemical erosion, especially for highly elevated regions of the Earth's surface. It is a principal ...
  • WHAT IS THE DEEPEST PART OF THE VOSTOK ICE CORE TELLING US? 
    Souchez R.; Jean-Baptiste P.; Jouzel J.; Petit J.R.; Lipenkov V.Ya. (2003)
    This review paper is mainly concerned with a geochemical investigation of the deepest part of the Vostok ice core between 3310 m, the depth at which the palaeoenvironmental record present in the ice above is lost, and the ...
  • WHEN A COSMIC IMPACT STRIKES THE SEA BED 
    Ormo J.; Lindstrom M. (2000)
    Most bolides that collide with the Earth hit the sea. Limited knowledge about marine-target impacts hampers predictions about their perilousness. This study presents geological features that are particular to craters formed ...
  • WHEN SHEARING IS A CAUSE OF FOLDING 
    Ez V. (2000)
    Numerous publications on shearing as a cause of folding do not refute the idea of buckling being the main process responsible for the formation of fold structures. Deformations of other types may either produce conditions ...
  • WHICH MODELS FOR COLLOCATED COKRIGING? 
    Rivoirard Ja. (2001)
    When a target variable is sparsely sampled, compared to a densely sampled auxiliary variable, cokriging requires simplifications. In its strict sense, collocated cokriging makes use of the auxiliary variable only at the ...