Reference : Sur les conditions dans lesquelles certains corps prennent la texture schisteuse
Scientific journals : Article
Engineering, computing & technology : Geological, petroleum & mining engineering
Sur les conditions dans lesquelles certains corps prennent la texture schisteuse
[en] The Conditions Under Which Some Bodies are Schistose Texture
Spring, Walthère [Université de Liège - ULiège]
Annales de la Société Géologique de Belgique. Mémoires
Société Géologique de Belgique
[en] Schistose texture
[fr] Texture schisteuse
[en] Annales de la Societe geologique de Belgique; memoires (1902), 29, 49-60, 6(ii), 257-61; SciFinder (Chemical Abstracts Service: Columbus, OH); (accessed July 8, 2010).

Earlier investigations (Bulletin of the Royal Academy of Bolgique [3] 35. 31-34. 1898) it had resulted in that pressure alone is not sufficient, in order to produce foliation of rocks or solid bodies but that two conditions must be fulfilled: in homogeneity and one-sided pressure. First by the elementary analysis it was proven that the layer surfaces of a black slate are substantially more carbon-rich, as the inner of the layers between them. a sediment made of intermittent layers of clay and humic substances under pressure became a thin petalled mass with a texture of a usual slate. For the formation of transverse foliation, lead sheets covered with fat were used, as well as cubes of the mentioned clay-humus mixture, which were through-pressed by a square steel can with slit ground. In this case the foliation was parallel to the walls of the opening, thus vertical to the direction of the pressure exerted by the pin on the mass. Wet clay, as well as metallic iron also take on a slaty texture by the same treatment. From this experiments author cocludes that slaty texture is not the direct result of pressure, even if this pressure caused a liquefaction or a rearrangement of the mass. The mutual attraction of the pressed particles firstly does not occur in the direction of pressure and finally, if the pressure goes beyond a certain limit, vertical to that one. At hydrostatic pressure at all no change of the direction of attraction of the pressed particles takes place. The conditions for the slaty texture of a substance are inhomogeneous pressure in all directions and lack of homogeneity, and it is unimportant, whereby they are fulfilled.

Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved.
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