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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of metamorphic geology 2 (1984), S. 0 
    ISSN: 1525-1314
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Abstract There are discrete masses of un-deformed metabasite within the blueschist series of the island of Syros. Greece. Around the margins of these masses are zonal sequences through rocks showing intracrystalline deformation but without a geometric fabric, to rocks with discrete and anastomosing shear zones, and finally to penetratively foliated rocks with isolated relics of the original undeformed texture. Textural relics suggest that this spatial sequence is at least qualitatively also a temporal sequence.This progressive shear zone deformation took place concurrently with a glaucophane-epidote to eclogite reaction. The reaction pathways in the rocks that underwent the shear zone deformation can be compared with those in rocks of a similar composition that suffered a longer deformation history and show no relics of an undeformed parent. Although the final assemblages are in both cases the same, the pathways are different. These differences are in part related to reactions promoted by the change from local to bulk equilibrium on the onset of deformation in the rocks. They are also related to the crystallization and later breakdown during the sequence of progressive equilibration of a metastable phase, in this case an impure glaucophane.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Oxford journal of archaeology 11 (1992), S. 0 
    ISSN: 1468-0092
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Archaeology
    Notes: Summary: The authors consider the specific nature and possible provenance of the various rock types commonly described as ‘jades’or ‘greenstones’from which some of the prehistoric axes and adzes in southern Italy and Sicily were made. Despite the presence of jadeite-rich pyroxenes in Calabrian metamorphic rocks, a non-local origin, probably in the north Italian or Alpine zone, seems more likely for ‘jadeite’implements in the south. By contrast, nephrite and serpentinite artifacts probably derive from sources in southern Basilicata, Calabria, and possibly northeastern Sicily, where alluvial deposits or natural outcrops could have been exploited. Certain aspects of procurement and techniques of manufacture are comparable with others recorded ethnographically. Evidence emerges for long-distance as well as local and interregional exchange.
    Type of Medium: Electronic Resource
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