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Abstract
Lower Cretaceous and Triassic-Hettangian clays from the Algarve Basin (South Portugal) were deposited in distinct environments during basin subsidence due to Pangea break up. The mineralogy, geochemistry and granulometry of 45 samples of both clay groups were studied, using X-ray diffraction, instrumental neutron activation analysis, X-ray fluorescence and laser diffractometry by attenuation of X-rays. Multivariate statistical techniques (principal component analysis and K-means clustering), after scandium normalization of chemical contents, were used to study simultaneously all data, enabling to distinguish the different clay types by establishing the best discriminatory parameters: high contents (in decreased order) of kaolinite, quartz, Chemical Index of Alteration (CIA), Ti, goethite, Hf, Si, > 63 im fraction and Zr, characterize the group of clays from Cretaceous; while high contents of hematite, Mg, mobile elements (K, Cs and P), illite, Ca, phyllosilicates in general, Mn and dolomite, are associated to Triassic-Hettangian clays. This approach revealed useful to facilitate the integration of all data, as was possible to confront the geochemistry with the mineralogy, enabling the best palaeoenvironmental interpretations. In fact, the clay mineral assemblage is significantly influenced by the dominant weathering process and provides information on changes in aridity/humidity patterns.
Keywords: Algarve Basin, Clays, Geochemistry, Mineralogy, Multivariate analysis, Palaeoenvironments
Current Analytical Chemistry
Title: Geochemistry and Mineralogy of Clays from the Algarve Basin, Portugal: A Multivariate Approach to Palaeoenvironmental Investigations
Volume: 6 Issue: 1
Author(s): Maria J. Trindade, Fernando Rocha and Maria I. Dias
Affiliation:
Keywords: Algarve Basin, Clays, Geochemistry, Mineralogy, Multivariate analysis, Palaeoenvironments
Abstract: Lower Cretaceous and Triassic-Hettangian clays from the Algarve Basin (South Portugal) were deposited in distinct environments during basin subsidence due to Pangea break up. The mineralogy, geochemistry and granulometry of 45 samples of both clay groups were studied, using X-ray diffraction, instrumental neutron activation analysis, X-ray fluorescence and laser diffractometry by attenuation of X-rays. Multivariate statistical techniques (principal component analysis and K-means clustering), after scandium normalization of chemical contents, were used to study simultaneously all data, enabling to distinguish the different clay types by establishing the best discriminatory parameters: high contents (in decreased order) of kaolinite, quartz, Chemical Index of Alteration (CIA), Ti, goethite, Hf, Si, > 63 im fraction and Zr, characterize the group of clays from Cretaceous; while high contents of hematite, Mg, mobile elements (K, Cs and P), illite, Ca, phyllosilicates in general, Mn and dolomite, are associated to Triassic-Hettangian clays. This approach revealed useful to facilitate the integration of all data, as was possible to confront the geochemistry with the mineralogy, enabling the best palaeoenvironmental interpretations. In fact, the clay mineral assemblage is significantly influenced by the dominant weathering process and provides information on changes in aridity/humidity patterns.
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Cite this article as:
Trindade J. Maria, Rocha Fernando and Dias I. Maria, Geochemistry and Mineralogy of Clays from the Algarve Basin, Portugal: A Multivariate Approach to Palaeoenvironmental Investigations, Current Analytical Chemistry 2010; 6 (1) . https://dx.doi.org/10.2174/157341110790069682
DOI https://dx.doi.org/10.2174/157341110790069682 |
Print ISSN 1573-4110 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-6727 |
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