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ANNA I. HAAPANIEMI JAMES D. SCOURSE VICTORIA L. PECK HILARY KENNEDY PAUL KENNEDY SIDNEY R. HEMMING MARK F. A. FURZE ANNA J. PIEŃKOWSKI WILLIAM E. N. AUSTIN JOHN WALDEN EMILIE WADSWORTH IAN R. HALL 《Boreas: An International Journal of Quaternary Research》2010,39(3):576-591
Haapaniemi, A.I., Scourse, J.D., Peck, V.L., Kennedy, H., Kennedy, P., Hemming, S.R., Furze, M.F.A., Pieńkowski, A.J., Austin, W.E.N., Walden, J., Wadsworth, E. & Hall, I.R. 2010: Source, timing, frequency and flux of ice‐rafted detritus to the Northeast Atlantic margin, 30–12 ka: testing the Heinrich precursor hypothesis. Boreas, Vol. 39, pp. 576–591. 10.1111/j.1502‐3885.2010.00141.x. ISSN 0300‐9483. Increased fluxes of ice‐rafted detritus (IRD) from European ice sheets have been documented some 1000–1500 years before the arrival of Laurentide Ice Sheet (LIS)‐sourced IRD during Heinrich (H) events. These early fluxes have become known as ‘precursor events’, and it has been suggested that they have mechanistic significance in the propagation of H events. Here we present a re‐analysis of one of the main cores used to generate the precursor concept, OMEX‐2K from the Goban Spur covering the last 30 ka, in order to identify whether the British–Irish Ice Sheet (BIIS) IRD fluxes occur only as precursors before H layers. IRD characterization and planktonic foraminiferal δ18O measurements constrained by a new age model have enabled the generation of a continuous record of IRD sources, timing, frequency and flux, and of local contemporary hydrographic conditions. The evidence indicates that BIIS IRD precursors are not uniquely, or mechanistically, linked to H events, but are part of the pervasive millennial‐scale cyclicity. Our results support an LIS source for the IRD comprising H layers, but the ambient glacial sections are dominated by assemblages typical of the Irish Sea Ice Stream. Light isotope excursions associated with H events are interpreted as resulting from the melting of the BIIS, with ice‐sheet destabilization attributed to eustatic jumps generated by LIS discharge during H events. This positive‐feedback mechanism probably caused similar responses in all circum‐Atlantic ice‐sheet margins, and the resulting gross freshwater flux contributed to the perturbation of the Atlantic Meridional Overturning Circulation during H events. 相似文献
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W. J. WADSWORTH 《Geology Today》1985,1(2):50-54
Recent research into layered intrusions (intrusive bodies in which there are layers of different mineralogical composition) provides an interesting example of 'role–reversal'. Traditionally, crystal settling has been regarded as the main agent of differentiation, with magma convection as a useful subsidiary factor. Now the behaviour of the fluid phase – before, during and after the main crystallisation period – is assuming increasing importance, even to the extent of eliminating the need for crystal settling altogether. The 'new wave' of ideas is stimulating and challenging, but by no means sounds the death–knell of conventional magmatic sedimentation. 相似文献
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Types of Igneous Cumulates 总被引：11，自引：7，他引：11
The term ‘cumulate’ is proposed as a group namefor igneous rocks formed by crystal accumulation. After accumulationof the crystal precipitate, various ways of completing the crystallizationprocess lead to differences in the rock finally produced. Thevarious types of cumulates which have so far been distinguishedare briefly described. 相似文献
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