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  • 1
    Electronic Resource
    Electronic Resource
    Oxford UK : Blackwell Science Pty
    The @island arc 7 (1998), S. 0 
    ISSN: 1440-1738
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Until recently it was thought that the volcanoes of the Mariana island arc of the western Pacific terminated at Tracey Seamount at ∼ 14°N immediately west of Guam. Sea floor mapping in 1995 shows a series of large volcanic seamounts stretching westward for nearly 300 km beyond that point. The morphology, spacing, and composition of those sampled are consistent with their having formed as a consequence of eruption of suprasubduction zone arc magmas. The relationships of the volcanoes to the tectonic processes of subduction of the Pacific plate beneath the southern portion of the Mariana convergent plate margin are becoming increasingly clear as new bathymetry and geochemical data are amassed. The volcanoes along this trend that lie closest to Guam are forming where the center of active extension in the back-arc basin intersects the line of arc volcanoes. They develop well-defined rifts that are parallel to rift structures along the extension center, whereas volcanoes of the spreading axis to the north are smaller than the frontal arc volcanoes and tend to form along lineaments. Compositions of lavas from these intersection volcanoes bear some similarities to back-arc basin basalt, but are on the whole well within the range of compositions for Mariana island arc lavas. The Pacific plate subducts nearly orthogonal to the strike of the trench along the southern part of the Mariana system and the distance to the arc line from the trench axis is only ∼ 150 km. Several deep fault-controlled canyons on the inner slope of the southern Mariana trench indicate an enhanced tectonic extension of this plate margin. The presence of these active arc volcanoes and the existence of the orthogonal normal faulting along the southern Mariana forearc supports a model of radial extension for formation of the Mariana Trough, a model previously dismissed because of the lack of evidence of these two major geological features.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Active spreading ridges in the North Fiji Basin range from well-developed stable ridges where largescale mantle upwelling is in progress to proto-ridges where spreading is incipient. South of 17°S, where the central ridge of the North Fiji Basin has a bathymetric profile normally expected of a fast-spreading, steadystate mid-ocean ridge, basalts are evolved N-type MORBs. North of 17°S, where the central ridge is propagating northward into old North Fiji Basin crust and spreading is in the initial stages, two types of basalt have been recovered: N-type MORBs from this northern arm of the central ridge are believed to be samples of older North Fiji Basin crust; basalts with transitional alkalic chemistry (up to 0.5% Ne in the Norm) and characterized by strong relative enrichments in Rb, Ba, K, Nb, La, Ce, Sr, P, Zr, and Ti are believed to be associated with incipient rifting. Among the latter group are compositions that are intermediate between transitional alkalic types and MORBs and these are geochemically similar to the back-arc basin (BABB) magma type defined by Sinton and Fryer (1987) from a study of Mariana back arc basin basalts. Dredges along the South Pandora Ridge, a transform zone characterized by short spreading segments, are dominated by basalts that are enriched in large-ion lithophile and high field strength minor and trace elements and compositions range from types resembling ocean island tholeiites to transitional alkalic varieties. Basalts from Rotuma are regarded as alkalic end-members of the South Pandora Ridge magmatic spectrum. In areas of the North Fiji Basin where relatively fast spreading must be accompanied by largescale asthenospheric upwelling, depleted (N-type) MORBs dominate, whereas in areas of slow mantle upwelling, or where some other tectonic effect (e.g. a transform fault) causes a transient thermal disturbance within the lithosphere or upper asthenosphere, enriched (alkalic) magmas either dominate or make a significant and noticeable contribution to the overall chemical characteristics of basalts being erupted. The MORBs have a depleted asthenospheric source, and the alkalic component is believed to derive from an enriched lithospheric or shallow asthenospheric source. The BABB magma type may simply be part of the spectrum of mixed magmas that can occur in the transitional tectonic settings represented by the early development of most back-arc basins.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1573-966X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract Keynes believed that the "general theory" would create a revolution in economics. The extent to which his prophesy was realized, in part, depends on the definition of "key elements" in the general theory itself. This paper presents one of the key elements that led Keynes to believe the general theory might indeed create such a revolution. This key element is his theory of probability. Keynes' theory of probability evolved over time and resulted in his employing two distinctly different theories of probability in the general theory—one, implicitly, the other, explicitly. The first was an objective degree of belief theory of probability that was implicitly employed in the general theory. The second was a subjective degree of belief theory of probability that Keynes explicitly developed in the general theory.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Atlantic economic journal 10 (1982), S. 65-65 
    ISSN: 1573-9678
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Atlantic economic journal 11 (1983), S. 118-125 
    ISSN: 1573-9678
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Atlantic economic journal 20 (1992), S. 21-31 
    ISSN: 1573-9678
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Atlantic economic journal 17 (1989), S. 55-62 
    ISSN: 1573-9678
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Atlantic economic journal 8 (1980), S. 52-61 
    ISSN: 1573-9678
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Atlantic economic journal 8 (1980), S. 110-110 
    ISSN: 1573-9678
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1573-966X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract Evaluating Keynes' belief that the "general theory" would create a revolution in economics, depends, in part, on what defines the key elements of the general theory. This paper presents the analytical preconditions for one of these key elements, his liquidity preference theory of money. It is argued here that Keynes's liquidity preference theory of money was both a result of his own intellectual development and a theoretical necessity, given the rest of the theoretical structure of the general theory. Specifically, this paper argues that there were two analytical preconditions for the theory of money contained in the general theory. The first was Keynes' rejection of the quantity theory of money as the basis for conducting monetary policy, a theory he inherited from his English predecessors and he himself had embraced and to which he contributed earlier in his professional career. The second was his rejection of the neoclassical loanable funds theory of interest rate determination.
    Type of Medium: Electronic Resource
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