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Browsing ELibrary by Title
Now showing items 2017-2036 of 21701
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(1998)40Ar-39Ar data constrain the history of metamorphism, deformation and mineralization in the western subprovince of the Lachlan Fold Belt. Rocks in the Mount Stavely Volcanic Complex and the Bushy Creek Pluton give 40Ar-39Ar ...
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(1997)The U-Pb dating of 18 samples, representing the principal rock types of the 4000 km2 Salmi anorthosite-rapakivi granite complex and its satellite Uljalegi pluton, southeastern Baltic (Fennoscandian) Shield, reveals that ...
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(2004)The specified on the basis of K-Ar data magmatic activity phases in manifestation time coincide with certain activity phases of other large latest-volcanism centers at Greater Caucasus - Elbrus and Kazbek. The initial ...
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(1990)In the crustal history of the northeast of the European part of the USSR (including the northern Urals), the tectonic processes of the pre-Baikalian, Baikalian, Caledonian, Hercynian and Alpine stages were the most important. ...
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(1999)Nineteen Holocene eruptive centers (cinder cones with lava flows and maars) were located and described in the Avacha horst and anticline zone west of the East Kamchatka volcanic area. A tephrochronological study and the ...
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(2003)The present article resumes the philosophy underlying the (re)definition of chronostratigraphic/geochronologic units through their boundaries by working groups of the International Commission on Stratigraphy (ICS), following ...
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(2001)We introduce new estimators for fracture trace intensity, trace density and mean trace length that exploit the use of circles as efficient sampling tools. A fracture trace is the commonly observed surface expression of a ...
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(2000)Combined cathodoluminescence (CL) and transmitted light microscopy were used to characterize quartz from flat and steeply dipping quartz veins and from veinlets in banded host rocks from the giant Muruntau Au quartz vein ...
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(2002)The Hamitidae are a family of mid-Cretaceous heteromorph ammonites including lineages leading to four other families. Problems are outlined in trying to describe the phylogeny of completely extinct groups such as these ...
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(2004)Cladistic analysis of the Middle Jurassic ammonite radiation shows how the Aalenian-age ancestral stock, known variously as the Hammatocerataceae or Hammatoceratinae, gave rise to numerous new groups in Bajocian times. ...
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(2004)The uncertainty of knowledge, in contrast to that of data, can be assessed by its probability in the logical sense. The logical concept of probability has been developed since the 1930s but, to date, no complete and accepted ...
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(1986)A chemical classification of common basalts and andesites is proposed which utilizes CIPW normative plagioclase compositions (100 an/(ab + an) = AN), differing levels of silica saturation (with respect to CIPW qz, hy, ol ...
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(2001)Technologies of cast-in-place piles have been considered. It has been shown that the cast-in-place piles are characterized by advantages in comparison with precast piles. Classification of the cast-in-place piles has been ...
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(2002)Deep-water sediment waves can be classified using a combination of grain size and wave-forming process, although in some cases one or other of these criteria may be indeterminable. Sediment waves are generated beneath ...
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(1995)We have analyzed, by duplicate neutron-activation analysis, 125 members of iron meteorite groups IAB and IIICD. These data show no hiatus between the groups, and we recommend that the two sets be treated as a single group ...
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(1989)The authors classified mantle peridotites in terms of the chemical composition of accessory chrome spinels only from harzburgites and 1herzolites containing no plagioclase. The sample of about 370 analyses includes data ...
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(2004)A 2D seismic grid in the South Caspian Basin, offshore Azerbaijan, is used to define the areal distribution of mud volcanoes and to make a classification of the mud volcanoes based on characteristic seismic features. A ...
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(2004)Structural geology textbooks distinguish among four end members of three-dimensional refold structures established from their two-dimensional interference patterns. Here it is shown that six different end members of ...
Now showing items 2017-2036 of 21701