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Browsing ELibrary by Title
Now showing items 8546-8565 of 21879
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(1998)I have oversaturated the immiscible system SiO2Al2O3FeOK2O with FeCr2O4 to study the fractionation of chromite between conjugate siliceous and fayalitic melts. Although both melts are oversaturated with chromite, chromite ...
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(2001)The principal isoprenoid hydrocarbons in flash pyrolysates from immature kerogens are prist-1-ene and, to a lesser extent, prist-2-ene. The precise origin of these compounds is still a matter of debate. Chemical degradation ...
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(2006)Silica-rich objects are common minor components in ordinary chondrites (OC), occurring as fragments and as chondrules. Their typical paragenesis is orthopyroxene + SiO2 (with bulk SiO2 >65 wt%) and occasionally with ...
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(1989)The foci of strong tremors are generally confined to long-lived active faults. However, some earthquakes occur at great distances from the boundaries of lithospheric plates, and the seismic events which occur in the stable ...
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(2004)Our investigations in Alaska and Russia show that the curved orogen of the Bering Strait region is a composite feature that formed as a result of multiple superimposed events and cannot be related to latest Cretaceous-early ...
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(1990)The origin of the Central Asiatic mountain belt is treated nowadays from two opposing points of view. Some researchers believe that it is a consequence of the collision of the Indo-Australian and Eurasian lithospheric ...
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(1990)Zone of oil and gas accumulation encompassing the Nadym-Pur, Pur-Tzov, Gydansk and Yamal oil and gas regions has been established in the northern part of West Siberia. A characteristic feature of this zone is the development ...
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(2004)An understanding of the tectonic stress field is geologically important because it is the agent that preserves in the crust a memory of dynamical processes. In an effort to elucidate the origin of the present state of ...
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(1992)Large deposits of magnesite (MgCO3) occur either as carbonated ultramafic rocks or as sedimentary beds. The origins of both sedimentary and ultramafic-hosted deposits remain controversial, as does the relationship between ...
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(2003)Detailed interpretation of upper-mantle scattered waves recorded in the 800-1400 km offset range of four reversed `peaceful nuclear explosion' seismic sections along the 3500 km long profile Kraton in Russia has revealed ...
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(2004)Secondary ion mass spectrometer (SIMS) oxygen isotope analyses were performed on 24 clasts, representing 9 clast types, in the Dar al Gani (DaG) 319 polymict ureilite with precisions better than 1‰. Olivine-rich clasts ...
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(1999)Isotopic analyses of fluids from the wells drilled in the Mutnovsky geothermal field revealed that the water of a melting glacier in the crater of Mutnovsky Volcano might be a source of water supply to the Dachnyi and ...
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(2001)Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) was used to measure distributions of the siderophile elements P, V, Cr, Fe, Co, Ni, Mo, Ru, Rh, Pd, W, Re, Os, Ir, and Pt in metal grains in the ...
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(2001)We have determined slip rates on the most active reverse faults, reconstructed an extensive preorogenic erosion surface, constructed local and regional cross sections, and dated syntectonic Tertiary sedimentary rocks by ...
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(2001)Investigations of natural and synthetic quartz specimens by cathodoluminescence (CL) microscopy and spectroscopy, electron paramagnetic resonance (EPR) and trace-element analysis showed that various luminescence colours ...
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(2003)Temporal patterns of origination and extinction are essential components of many paleontological studies, but it has been difficult to obtain accurate rate estimates because the observed record of first and last appearances ...
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(1997)The origins of surface roughness (λ) of powdered feldspar grains, the ratio of the total surface area quantified by gas adsorption to the surface area estimated by assuming an average grain geometry, has been investigated ...
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(2001)Orogenic gold deposits have formed over more than 3 billion years of Earth's history, episodically during the Middle Archean to younger Precambrian, and continuously throughout the Phanerozoic. This class of gold deposit ...
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(1998)The so-called `mesothermal' gold deposits are associated with regionally metamorphosed terranes of all ages. Ores were formed during compressional to transpressional deformation processes at convergent plate margins in ...
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(2000)Phyllonite and metaquartzite clasts occur in early Pliocene or possibly Miocene sediment at the base of the University of Wisconsin Arctic Ocean core Fl-380. Single-crystal 40Ar/39Ar laserprobe ages derived from feldspars ...
Now showing items 8546-8565 of 21879