Journal
ORE GEOLOGY REVIEWS
Volume 63, Issue -, Pages 296-306Publisher
ELSEVIER
DOI: 10.1016/j.oregeorev.2014.05.020
Keywords
Bauxite geochemistry; Compositional data; Discriminant function model; Adriatic-Dinaric Carbonate Platform; K-Pg unconformity; Istrian Peninsula; Croatia
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Funding
- Ministry of Science, Education and Sports, Republic of Croatia (MZOS) - Scientific Project: The Geological Maps of the Republic of Croatia
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Investigation of the origin and occurrence of Istrian Lower Palaeogene bauxites discussed in this work relies on adoption of the recent perspectives on development of the collision-induced diachronous discontinuity surface in the Istrian part of the Adriatic-Dinaric carbonate platform. This process, related to the forebulge uplift at the latest stages of Alpine orogenesis, is amply recorded in the geochemical signature of contemporaneous bauxites. In order to elucidate the patterns of bauxite formation a discriminant function model based on the Compositional Data analysis (major and trace elements) is constructed providing the solid ground for separation of the bauxite groups deposited in the subaerially exposed Istrian palaeoenvironment. Complete distinction between the four a priori defined Istrian Lower Palaeogene bauxite groups achieved by the analysis demonstrates the highest degree of efficiency in characterizing environmental conditions marked by the unique suite of geochemical variables (compositions). (C) 2014 Elsevier B.V. All rights reserved.
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