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  • 1
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    Discussion on the Paper by Denton and Hughes (1983) (1985)
    Cambridge University Press
    Details
    Publication Date: 1985-11-01
    Print ISSN: 0033-5894
    Electronic ISSN: 1096-0287
    Topics: Geography , Geosciences
    Published by Cambridge University Press
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  • 2
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    Multiple Deglaciations of the Hudson Bay Lowlands, Canada, Since Deposition of the Missinaibi (Last-Integlacial?) Formation (1983)
    Cambridge University Press
    Details
    Publication Date: 1983-01-01
    Description: The stratigraphic record in the James and Hudson Bay Lowlands indicates that the sequence of glacial events at the geographical center of the 12.6 × 106 km2 Laurentide Ice Sheet may have been more complex than hitherto imagined. Isoleucine epimerization ratios of in situ and transported shells recovered from till and associated marine and fluvial sediments cluster into at least 4 discrete groups. Two alternative explanations of the data are offered, of which we strongly favor the first. Hypothesis 1: Setting the age of the “last interglacial” marine incursion, the Bell Sea, at 130,000 yr B.P. results in a long-term average diagenetic temperature for the lowlands of +0.6°C. Using this temperature enables us to predict the age of shells intermediate in age between the “last interglaciation” and the incursion of the Tyrrell Sea 8000 yr ago. Between these two interglacial marine inundations, Hudson Bay is predicted to have been free of ice along its southern shore about 35,000, 75,000, and 105,000 yr ago based on amino acid ratios from shells occurring as erratics in several superimposed tills and fluvial sediments. These results suggest (1) that traditional concepts of ice-sheet build-up and decay must be reexamined; (2) that “high” sea levels may have occurred during the Wisconsin Glaciation; and (3) that a critical reappraisal is required of the open ocean δ18O record as a simple indicator of global ice volume. An alternative, Hypothesis 2, is also examined. It is based on the assumption that the 35,000-yr-old deposits calculated on the basis of Hypothesis 1 date from the “last interglaciation”; this, in effect, indicates that the Missinaibi Formation, commonly accepted as sediments of the “last interglaciation,” are about 500,000 yr old and that the effective diagenetic temperature in the lowlands during approximately the last 130,000 yr has been close to −6°C. We argue for rejection of this alternative hypothesis.
    Print ISSN: 0033-5894
    Electronic ISSN: 1096-0287
    Topics: Geography , Geosciences
    Published by Cambridge University Press
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  • 3
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    Reply to A. S. Dyke's Discussion (1984)
    Cambridge University Press
    Details
    Publication Date: 1984-09-01
    Print ISSN: 0033-5894
    Electronic ISSN: 1096-0287
    Topics: Geography , Geosciences
    Published by Cambridge University Press
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  • 4
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    Former Ice Shelves in the Canadian High Arctic (1978)
    Cambridge University Press
    Details
    Publication Date: 1978-01-01
    Description: Moraines deposited by the outermost ice advance across Judge Daly Promontory, northeastern Ellesmere Island, reflect thin, topographically controlled ice lobes extending to sea-level. The termini of two ice lobes were investigated and both produced ice shelves where they flowed into isostatically depressed embayments along western Kennedy Channel. Morphological evidence for these ice shelves occurs at the entrance to these valleys where steeply descending lateral moraines become abruptly horizontal for 2 km. In addition, both the horizontal moraines and associated pro-glacial terraces are fossiliferous down-valley from the apparent grounding line. Based on the differences in elevation between the horizontal moraines and the valley bottoms, the two ice shelves had estimated thicknesses ofc. 110 and 150 m. A proglacial outwash terrace at 175 m a.s.l. is considered to represent the approximate relative sea-level during the formation and break-up of the ice shelves. This relative sea-level is consistent with the water depths required to float the calculated ice thicknesses in both valleys. Associated with these ice margins are finite14C dates of 28 000-30 000 B.P. and amino-acid age estimates of 〉35 000 B.P. The importance and likelihood of additional past ice shelves in the Canadian High Arctic is discussed.
    Print ISSN: 0022-1430
    Electronic ISSN: 1727-5652
    Topics: Geography , Geosciences
    Published by Cambridge University Press on behalf of International Glaciological Society.
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  • 5
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    Former Ice Shelves in the Canadian High Arctic (1978)
    Cambridge University Press
    Details
    Publication Date: 1978-01-01
    Description: Moraines deposited by the outermost ice advance across Judge Daly Promontory, northeastern Ellesmere Island, reflect thin, topographically controlled ice lobes extending to sea-level. The termini of two ice lobes were investigated and both produced ice shelves where they flowed into isostatically depressed embayments along western Kennedy Channel. Morphological evidence for these ice shelves occurs at the entrance to these valleys where steeply descending lateral moraines become abruptly horizontal for 2 km. In addition, both the horizontal moraines and associated pro-glacial terraces are fossiliferous down-valley from the apparent grounding line. Based on the differences in elevation between the horizontal moraines and the valley bottoms, the two ice shelves had estimated thicknesses of c. 110 and 150 m. A proglacial outwash terrace at 175 m a.s.l. is considered to represent the approximate relative sea-level during the formation and break-up of the ice shelves. This relative sea-level is consistent with the water depths required to float the calculated ice thicknesses in both valleys. Associated with these ice margins are finite 14C dates of 28 000-30 000 B.P. and amino-acid age estimates of 〉35 000 B.P. The importance and likelihood of additional past ice shelves in the Canadian High Arctic is discussed.
    Print ISSN: 0022-1430
    Electronic ISSN: 1727-5652
    Topics: Geography , Geosciences
    Published by Cambridge University Press on behalf of International Glaciological Society.
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  • 6
    Electronic Resource
    Electronic Resource
    A phase transition in a 3D growth-disorder model (1978)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 34 (1978), S. 120-123 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: It is shown that a model of growth disorder, describing the way in which substitutional disorder can be introduced into binary solid solutions at growth, exhibits a phase transition. In a particular case it is shown that the distribution in 2D sections of the crystal corresponds to the simple pair-interaction Ising model on a triangular lattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739478000212
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  • 7
    Electronic Resource
    Electronic Resource
    A phase transition in a 3D growth-disorder model; erratum (1978)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 34 (1978), S. 1030-1030 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The following corrections should be made in Welberry & Miller [Acta Cryst. (1978). A34, 120-123]. 1. Equation (2) on p. 121 should read: E(σ) = - \sum_{{\rm all_{sites}}} σi,j,k [J(σi - 1, j, k + 1 + σ i,j + 1, k - 1 + σi + 1 j - 1, k) + K (σi - 1, j,k + σi,j - 1,k + σi,j,k - 1) + L(σi - 1, j,kσi,j - 1, kσi,j,k - 1)]. 2. The expression for J on p. 121 should be J = 1/8 In [a(1 - a)/b(1 - b)]. 3. In the second paragraph of the second column on p. 121 'J and - K' should be replaced by 'K and -J'. All information is given in the Abstract.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739478002132
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  • 8
    Electronic Resource
    Electronic Resource
    A three-dimensional model of crystal-growth disorder (1979)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 35 (1979), S. 391-400 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The relationship between nearest-neighbour growth-disorder models and Ising models is described in detail. The growth model with only two-body interactions is shown to be equivalent, in section perpendicular to the growth direction, to a simple Ising model. Two approximate solutions for the growth model are compared with exact solutions of equivalent Ising models, where possible, and also with computer realizations; the behaviour of these approximate solutions is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S056773947900098X
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  • 9
    Electronic Resource
    Electronic Resource
    Paracrystals and growth-disorder models (1980)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 921-929 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Some problems of the paracrystal model of diffraction from distorted lattices are discussed. The relationship between paracrystals and crystal growth-disorder models is established and the latter are used to generate examples of distorted lattices having many of the properties envisaged for paracrystals without some of the drawbacks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739480001921
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