Abstract
The Thermally Stimulated Depolarization Currents (TSDC) technique was used to characterize a lithological contact in a sedimentary sequence (Cretaceous Northeastern, Venezuela). TSDC spectra in the temperature range from 77 to 240 K were obtained for samples collected near a contact identified in the field as that between Chimana (CH) and Querecual (QC) formations. Deconvolution of the complex spectra, by the Direct Signal Analysis (DSA) method, shows the presence of four overlapping peaks. Drying and rehydration treatments performed on these samples indicate that the dielectric peaks are associated with physisorbed moisture. TSDC results show a progressive change in the mean reorientation energy with the lithology for the four relaxations. In the same lithological zone where this variation is observed, NRM measurements indicate significant changes in remanent magnetization values. The results obtained suggest that TSDC technique can be used as sensitive and alternative means of characterizing lithologies and stratigraphic discontinuities in a sedimentary sequence.
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