ROTATIONAL SLUMPS AND SLUMP SCARS IN SILURIAN ROCKS, WESTERN IRELAND     

M. G. LAIRD 《Sedimentology》1968,10(2):111-120

Curved or planar discordant surfaces occurring within a limited stratigraphic range immediately beneath shallow marine deposits represent penecontemporaneous shear surfaces along which slumps have moved. Rotated packets of strata frequently retained within the curved discordant surfaces show both internal and external evidence of having moved laterally. Movement is considered to have been triggered off by a sudden shock or shocks which may have been either of sedimentary or tectonic origin. The slumping occurred at the change in gradient between slope and shallow marine shelf deposits.  相似文献   

AN OPTICAL METHOD OF MEASURING GRAIN ORIENTATION IN SEDIMENTS     

A. M. WINKELMOLEN  W. VAN DER  KNAAP R. EIJPE 《Sedimentology》1968,11(3-4):183-196

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Einfuhrung in die mineralogie     

Toni P. Labhart 《Engineering Geology》1968,2(6):432-433

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Canterbury Landscapes: a Study in Contrasts     

Jane M. Soons 《New Zealand geographer》1968,24(2):115-132

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ANALYTICAL AERIAL TRIANGULATION BLOCK ADJUSTMENT; THE DIRECT HEIGHT SOLUTION INCORPORATING TIE-STRIPS     

A. D. N. Smith    M. J. Miles  P. Verrall 《The Photogrammetric Record》1967,5(29):327-350

The historical development of analytical aerial triangulation block adjustment is mentioned by way of introduction. The advantages of separating the plan and height adjustments are given and the observation equations of a typical adjustment section are analysed to show that this convenient practice is justified in normal circumstances. The principles of a direct solution of the normal equations suitable for a moderate-sized computer, are explained and developed in detail for the height adjustment. The advantages of tie-strips in the height adjustment are demonstrated and the difficulties which then arise are discussed. An approximate method which overcomes these difficulties is developed. Details of the computer programmes used are given in Appendix B.  相似文献   

The inhibition of microorganisms by heavy metals     

W. R. Sadler  P. A. Trudinger 《Mineralium Deposita》1967,2(3):158-168

This paper examines the effects of heavy metals on microorganisms in the aqueous environment; the mechanisms by which metals may exert toxic effects on microbes and the factors affecting microbial response to metals; the ways in which microbial activity may alter the metal balance of an environment and the modifications produced in microbes by heavy metal ions; the effects of the toxic copper ion on the growth, respiration, magnesium content, cytochrome synthesis and osmotic sensitivity of some organisms studied in the laboratory; and the feasibility of the participation of microbes in geochemical processes considering the demonstrable resistance to toxic metals by some bacteria and the fact that natural environments may contain high levels of metals rendered less toxic by binding to natural chelating compounds.

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Zusammenfassung In dieser Arbeit werden verschiedene Wirkungen von Schwermetallen auf Mikroorganismen in wäßrigem Milieu untersucht. Es wird gezeigt, daß Schwermetalle toxische Wirkungen auf Mikroorganismen ausüben können und welche Faktoren die Reaktionen von Mikroben gegenüber Metallen bestimmen. Weiter wird beschrieben, wie die Mikrobenaktivität das Metallgleichgewicht in einem gegebenen Milieu verändern und beeinflussen kann und wie andererseits Änderungen in den Mikroben selbst durch Schwermetall-Ionen hervorgerufen werden. Dabei wird besonders die Wirkung des toxischen Kupfer-Ions auf das Wachstum, die Atmung, den Magnesiumgehalt, die Cytochromsynthese und die osmotische Empfindlichkeit einiger Mikroorganismen dargestellt. Die Anwesenheit von Mikroben bei geochemischen Prozessen wird unter Berücksichtigung der Resistenz einiger Bakterien gegenüber toxischen Metall-Ionen diskutiert. Dabei spielt die Tatsache eine große Rolle, daß durch Chelatbildung die Schwermetall-Ionen in der natürlichen Umwelt der Mikroorganismen ihre toxische Wirkung verlieren.

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Buchbesprechungen     

F. Steinhauser  W. Mörikofer  K. Cehak 《Theoretical and Applied Climatology》1967,15(3):313-328

Ohne Zusammenfassung  相似文献   

The stability of the copper-iron sulphides     

P. A. Young 《Mineralium Deposita》1967,2(3):250-250

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Buchbesprechungen     

F. Steinhauser  O. Burkard  W. Mörikofer  M. Toperczer 《Meteorology and Atmospheric Physics》1962,13(2):290-304

Ohne Zusammenfassung  相似文献   

On the basic principles of geophysical radioactive measurements     

P. Márton  L. Stegena 《Pure and Applied Geophysics》1962,53(1):55-64

Summary The process of radon diffusion in space and time through rocks is treated in detail from the point of view of radiometric prospecting for oil. Taking into account the depth and diffusivity conditions encountered in nature it is stated that vertical radon diffusion reaching from the oil deposits up to the surface cannot be expected. Time intervals as required for setting in of a stationary concentration state and decay conditions of the radon lead to the conclusion that the penetration of emanometric measurements seldom exceeds the depth of 5–10 m.  相似文献