Report on the Geological Structure and Stability of the Hill Slopes Around Naini Tal

Report on the Geological Structure and Stability of the Hill Slopes Around Naini Tal

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 edition. Excerpt: only removed completely at temperatures over 3300 C. Whilst there is no doubt that the slates iii proximity to the sheets of intrusive trap have been raised far above this latter temperature, it is impossible to say to what temperature the slates generally have been exposed in past times. There is no doubt that they have been depressed to great depths in the Earth's crust since their original deposition, and have thus been exposed to high temperatures, and there is no doubt also that they have been exposed to pressure sufficient to produce cleavage, and movement under pressure sufficient to shear them. We know very little about the amount of heat produced in such cases, and practically nothing about the accompanying rise of temperature; but experiments by R. Mallet showed that mere crushing of slate was sufficient to produce heat enough to raise its temperature by about 1400 F.1 1 Cf. PfafF, Allgemeine Geologie, p. 141. W. B. and R. E. Rogers. "On the decomposition and partial solution of minerals, rocks, etc., by pore water, and water charged with carbonic acid." Amtr. Jour. Set., 2nd ser., vol. V, p. 401 (1848). At any rate, whatever may have been the vicissitudes of temperature through which the Naini Tal slates have passed, there is no' doubt that they have been dehydrated and have since only partially recovered their water. Specimens dried over sulphuric acid gave the following results on ignition: --81. Like a natural anhydrite, or over-burnt gypsum, the dehydrated slates and shales gradually absorb water and form the higher hydrated silicates of alumina with simultaneous expansion of the mass. Besides the normal hydrous silicate of alumina represented in pure form by kaolin (AljOa. SiOj. 2HsO), which contains 14 per cent, more

Product details

  • Paperback | 30 pages
  • 189 x 246 x 2mm | 73g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236496884
  • 9781236496881