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Proceedings of the Academy of Natural Sciences of Philadelphia (Volume 138-139)

Proceedings of the Academy of Natural Sciences of Philadelphia (Volume 138-139)


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About the Book

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. 1883. Excerpt: ... THE GENESIS OF THE CRYSTALLINE IRON-OEES. BY ALEXIS A. JULIEN. In an age which admits its special indebtedness for material advancement to the industries connected with the manufacture of iron, and in a country in which these industries have been so vastly developed as in this, the question of the origin of that metal has long possessed, and must always retain, a high degree of interest. So far as relates to the limonites, turgites and bogores, the question has met with a satisfactory answer in the theory of the concentration of these ores by the percolation of organic acids, as fully presented in the writings of Bischoff, Hunt and others; especially as the process can be actually observed and studied in progress in the lakes, marshes and bogs of the present day. But the mode of genesis of the crystalline ores--hematites, magnetites, menaccanites, and their mixtures--enveloped partly in the sedimentary strata and chiefly in the still more ancient crystalline rocks of archroan age, can be only inferred from analogies. Nor can the problem be considered as solved by any or all of the numerous theories which have so far been advanced. These theories may be naturally divided into two classes, as they may refer the iron-ores, enclosed in the subterranean strata, to an extraneous or to an indigenous origin. A. Theories Of Extraneous Origin. To begin with the former, we have 1. Meteoric fall. This startling theory has been suggested to account for the enormous mass of martitic specular iron-ore, claimed to be the most extensive known single deposit of iron-ore on the continent, that of the Cerro de Mercado, two miles from Durango, Mexico. "Cerro de Mercado is a mountain, one mile long, one-third of a mile wide, and from 400 to 6OO feet in height. The ore.surface ...


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Product Details
  • ISBN-13: 9781153886598
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 126
  • Spine Width: 7 mm
  • Width: 189 mm
  • ISBN-10: 1153886596
  • Publisher Date: 04 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 290 gr


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