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  • 1
    Electronic Resource
    Electronic Resource
    Syntaxial overgrowths in muddy crinoidal limestones: cathodoluminescence sheds new light on an old problem (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 31 (1984), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Lower Carboniferous shallow water limestones of Asbian and Brigantian age in Britain commonly contain abundant interparticle micrite and characteristically display large syntaxial calcite overgrowths on crinoid and echinoid grains. These overgrowths appear to have developed at the expense of the micrite and are widely regarded as neomorphic replacements. However, cathodoluminescence of these has revealed growth features which indicate that they are not neomorphic but originated as passive cement fills of solution voids surrounding echinoderm grains.We introduce the term solution corona for these grain selective voids and consider that three processes may have contributed to their development, namely: high-Mg calcite stabilization of host grains, crystal ripening, and meteoric dissolution. Cyclic subaerial emergence was a critical factor in these processes, and we contrast the morphology of the overgrowths in question with forms produced in basinal limestones which never experienced comparable early meteoric conditions.These early-formed solution coronas around echinoderm grains are therefore a useful indicator of meteoric diagenesis and have important implications for porosity evolution. The syntaxial cements which fill the solution coronas show distinct phases of growth in cathodoluminescence which reflect a progression from near-surface meteoric conditions to deep burial with pressure solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1984.tb01962.x
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  • 2
    Electronic Resource
    Electronic Resource
    Natural calcite in cathodoluminescence: crystal growth during diagenesis (1984)
    [s.l.] : Nature Publishing Group
    Nature 308 (1984), S. 525-527 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In a fresh state the solid framework (stereom system) of crinoid and other echinoderm grains consists of high-Mg calcite1,2. This mineral phase rarely survives unchanged during diagenesis2,8 and syntaxial overgrowths apparently always consist of low-Mg calcite9-11. Evamy and Shearman3,4 established ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/308525a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The first pre-Rhaetic therian mammal (1985)
    [s.l.] : Nature Publishing Group
    Nature 314 (1985), S. 161-163 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Vertebrate-bearing fissure deposits are known at several sites in the Lower Carboniferous/Mesozoic unconformity either side of the Severn Estuary (Fig. 1). The fissures comprise a variety of features including karstic cave systems, tectonic joints and faults; their fills range from Triassic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/314161a0
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  • 4
    Electronic Resource
    Electronic Resource
    Pre-Rhaetic therian mammals (1985)
    [s.l.] : Nature Publishing Group
    Nature 318 (1985), S. 82-82 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FRASER, WALKDEN AND STEWART REPLY-We are most interested to learn that on the basis of detailed comparisons with well-dated German faunas1, Buifetaut and Martin would now revise downwards the age of the Saint-Nicholas-de-Port vertebrate assemblage. Although there is as yet no other firm evidence to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/318082a0
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    Paper (German National Licenses)
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