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LOWER PALEOGENE BAUXITES OF VINIŠĆE, UGLJAN, SILBA AND OLIB

Authors
Publisher
Faculty of Mining, Geology and Petroleum Engineering University of Zagreb
Publication Date
Keywords
  • Boksit
  • Boksitični Vapnenci
  • Donji Paleogen
  • Gornja Kreda
  • Bauxite
  • Bauxitic Limestones
  • Lower Paleogene
  • Upper Cretaccous

Abstract

Bauxite Deposits of Lower Paleogene in the studied area are minor and rare. In these bauxites and bauxitic limestones oolitic textures and bochmite composition prevail as in other Lower Paleogene bauxites of Dinarides, however, with a difference that these bauxites more frequently have increased contents of kaolinite. Bauxites were created during the emergence wich lasted from the end of Senonian to the Upper Paleocene — Lower Eocene. The analyzed bauxites have the increased contents of silica and they differ in regard to the contents of Al2O3 and microelements. There are differences also in the degree of sphericity of ooides, while the degree of roundness is more or less equal. On the basis of investigations so far, it may be concluded that the most advantageous conditions for the formation of Lower Paleogene bauxites have been in Istria and Herzegovina. Less favourable condi¬tions have been in the area of today's islands of the Northern Adriatic. The most unfavourable were the areas of Southern Primorje and Northern Dalmatia, as shown in the example of Lower Paleogene deposits described here.

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