{'fraction_non_alphanumeric': 0.02756141402037148, 'fraction_numerical': 0.0, 'mean_word_length': 5.5234375, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Qualitative and semiquantitative analysis of magnetic lineaments in the Crystalline Basement Aquifer, Paraná - Brazil

This work focus on the use Radially Averaged Power Spectrum (SPC) filters of airborne magnetic data to define qualitatively and semiquantitatively hydrogeological exploratory targets in the Crystalline Basement Aquifer of Paraná State, Brazil. The aquifer comprises the outcrop portion of the crystalline shield. Different enhancement methods were applied to the aeromagnetometric data, both from the main Total Magnetic Intensity (TMI) and the TMI from the magnetic sources at different depths generated by the SPC filters, in order to verify if the surface magnetic sources are attractive data. We evaluate that “shallow sources" and, what are conventionally called "noises", are not appropriate for the interpretation of the magnetic lineaments, nor the "deep sources". Nevertheless, the deep sources helped to understand the magnetic domains intrinsic of the regional geologic framework. For the interpretation of the lineaments, the most attractive product was the “intermediate sources”. These sources were processed according to the following steps: Reduce to Pole (RTP); Tilt Angle (TDR) and Tilt Angle of Total Horizontal Derivative (TAHG) applications. A second map of lineaments was generated with the previous steps, however, preceded by the application of the Directional Cosine to the TMI data. The purpose is to reduce the strong magnetic effect of NW-SE structures, corresponding to the Dyke Swarms from the Ponta Grossa Arch. At the end, the lineaments were integrated, generating the magnetic framework of the corresponding aquifer.