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Browsing ELibrary by Title
Now showing items 3855-3874 of 21768
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(2004)The evolutionary history of six genera of Early Triassic Boreal Dinaritaceae (Hypophiceras, Tompophiceras, Metophiceras, Sakhaitoides, Sakhaites, and Kelteroceras) is discussed, and patterns and pathways of their evolutionary ...
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(2001)The vesiculation of granitic melt at a steady pressure release from 1000 to 500 bar at T = 750°C over a period of approximately one day was experimentally studied. The size of fluid bubbles in glasses was measured in a ...
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(1998)Proto-, para-, and euconodonts are characterized, and their stratigraphic significance is evaluated. General evolutionary trends and stages of development are depicted for the Proconodontus, Teridontus, and Hirsutodontus ...
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(2002)Late Cenozoic volcanic centers throughout the Bering Sea region of Alaska consist of small-volume eruptions of flows and cones of tholeiitic to alkaline basalt. Peridotite (spinel lherzolite, websterite, wehrlite, and ...
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(1989)The evolution of exogene copper accumulation can be illustrated by cupriferous sandstones and shales, which are known from the Early Proterozoic to the Neogene, inclusive. Their exogene origin throughout that time interval ...
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(2002)Evolution of fracture porosity in mid-crustal shear zones can be simulated in in-situ experiments. Evolution of fracture networks was monitored during simple shearing of 2-mm-wide zones in wet and dry aggregates of ...
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(2000)Area-weighted thickness distributions of fundamental illite particles for samples of illite and illite-smectite from seven locations (including bentonites and hydrothermally altered pyroclastics) were measured by Pt-shadowing ...
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(1990)Our work has shown that the evolution of granite pegmatites in different tectonomagmatic and metamorphic cycles of development of the Alpine-Himalayan fold belt is expressed in a systematic change from some pegmatite ...
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(2002)Plates cut from natural diamond crystals from the Siberian diamondiferous province were studied using an optical microscope and scanning electron microscope equipped with a color TV display. Many crystals exhibit a change ...
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(1988)Pyrite is the most common ore mineral in both coal measures and coal of the Donbas, whatever the stage of their metamorphism. Our laboratory work included X-ray, isotopic-geochemical and thermoelectric analysis and electron ...
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(1996)A mixing mechanism prevalent in natural flows is the formation and breakdown of vortical billows known as Kelvin-Helmholtz (K-H) instabilities. Here we present field examples of K-H billow occurrences in the atmosphere and ...
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EVOLUTION OF LIGHT HYDROCARBON GASES IN SUBSURFACE PROCESSES: CONSTRAINTS FROM CHEMICAL EQUILIBRIUM (1995)The behaviour of CH4, C2H6 and C3H8 in subsurface processes such as magma intrusion, volcanic gas discharge and natural gas generation have been examined from the viewpoint of chemical equilibrium. It seems that equilibrium ...
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(2002)Synchrotron radiation S K- and L-edge X-ray absorption near-edge structure (XANES) spectra are reported for the cubic, rocksalt (B1) structure sulfides niningerite (MgS), alabandite (MnS), and oldhamite (CaS), and for their ...
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(2001)The crust in the south of the Siberian Craton includes the tonalite-trondhjemite complex of the basement, the highly metamorphozed rocks of the Kitoi Suite, the rocks of the Onot greenstone belt, ultrametamorphic rocks, ...
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(2003)Mineral fish are lozenge-shaped porphyroclasts, single crystals in a finer grained matrix, which occur in ductile shear zones and which are commonly used as shear sense indicators. Mineral fish of biotite, tourmaline, ...
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(2003)The links between an early phase of orogenesis, when orogens are commonly wedge shaped, and a later phase, with a plateau geometry, are investigated using coupled thermal-mechanical models with uniform velocity subduction ...
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(2004)Morphogenetic peculiarities of exine striation types characteristic of the Phanerozoic miospores are discussed. During the period over 400 m.y. long, terrestrial plants produced 21 types of miospores with variably striated ...
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(2000)The Bertaut-Warren-Averbach (BWA) technique and high-resolution transmission electron microscopy (HRTEM) were used to characterize the products of dry-ground pyrophyllite. Mean crystallite thickness and crystallite thickness ...
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(2002)During rainfall events, surface roughness affects runoff generation by providing water surface storage in the depressions and altering the flow direction on the surface. The process of runoff initiation, or triggering, ...
Now showing items 3855-3874 of 21768