Scholarlink

<p>Gold plays a central role in the global economy as a store of value, a strategic asset, and an important raw material for industrial and technological applications. In mineral exploration, geochemical prospecting allows the delineation of anomalous drainage basins and the identification of areas with potential for gold mineralization. However, identifying the primary source of these anomalies remains a challenge, particularly in structurally complex geological settings. In this context, the integration of geochemical data with geophysical and structural methods represents a promising approach to reduce uncertainties and guide the definition of exploration targets. The identification of gold anomalies in stream sediments from the Cerro da Cria basin, in Vila Nova do Sul (RS), within the southern Brazilian Shield, indicates regional potential for the occurrence of primary gold deposits. Based on this previous geochemical study, geophysical surveys were conducted at the drainage-basin scale, including ground gamma-ray spectrometry and ground magnetometry, complemented by drone-based topographic surveys and field structural measurements, with the objective of identifying potential source areas of mineralization. This integrated approach relates geophysical and structural signatures to previously recognized geochemical anomalies. Radiometric results indicate enrichment in K, Th, and U in the northeastern sector of the basin, with elevated K values possibly associated with hydrothermal alteration zones. The same domain shows high analytical signal amplitude (ASA), interpreted as a reflection of increased magnetization associated with remobilization processes during a regional shearing event. Magnetometry-derived products reveal lineaments and fractures predominantly oriented NE–SW and E–W, which segment the Cerro da Cria Granite and likely acted as preferential pathways for hydrothermal circulation and geochemical remobilization. The spatial association between regional structures, high magnetic response, and potassium enrichment defines a geophysical and geochemical signature consistent with a prospective primary source area for gold, potentially responsible for the provenance of the anomalous sediments identified in the basin. Overall, the results demonstrate that the integration of structural and geophysical data with drone-based surveys enables an efficient, versatile, rapid, and high-resolution assessment of anomalous drainage basins, resulting in the selection of a priority target for direct follow-up sampling aimed at estimating grade and evaluating resources.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Geophysical modeling in a drainage basin with a gold geochemical anomaly, Cerro da Cria Region, Vila Nova do Sul, Rio Grande do Sul (Brazil)

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年8月5日

查看全文
  • Daniela Kuranaka,
  • César Augusto Moreira,
  • Marina Fernandes Sanches Barros,
  • Dionísio Uendro Carlos,
  • João Pedro Prado de Oliveira,
  • Lenon Melo Ilha,
  • Sissa Kumaira,
  • Henri Masquelin

摘要

Gold plays a central role in the global economy as a store of value, a strategic asset, and an important raw material for industrial and technological applications. In mineral exploration, geochemical prospecting allows the delineation of anomalous drainage basins and the identification of areas with potential for gold mineralization. However, identifying the primary source of these anomalies remains a challenge, particularly in structurally complex geological settings. In this context, the integration of geochemical data with geophysical and structural methods represents a promising approach to reduce uncertainties and guide the definition of exploration targets. The identification of gold anomalies in stream sediments from the Cerro da Cria basin, in Vila Nova do Sul (RS), within the southern Brazilian Shield, indicates regional potential for the occurrence of primary gold deposits. Based on this previous geochemical study, geophysical surveys were conducted at the drainage-basin scale, including ground gamma-ray spectrometry and ground magnetometry, complemented by drone-based topographic surveys and field structural measurements, with the objective of identifying potential source areas of mineralization. This integrated approach relates geophysical and structural signatures to previously recognized geochemical anomalies. Radiometric results indicate enrichment in K, Th, and U in the northeastern sector of the basin, with elevated K values possibly associated with hydrothermal alteration zones. The same domain shows high analytical signal amplitude (ASA), interpreted as a reflection of increased magnetization associated with remobilization processes during a regional shearing event. Magnetometry-derived products reveal lineaments and fractures predominantly oriented NE–SW and E–W, which segment the Cerro da Cria Granite and likely acted as preferential pathways for hydrothermal circulation and geochemical remobilization. The spatial association between regional structures, high magnetic response, and potassium enrichment defines a geophysical and geochemical signature consistent with a prospective primary source area for gold, potentially responsible for the provenance of the anomalous sediments identified in the basin. Overall, the results demonstrate that the integration of structural and geophysical data with drone-based surveys enables an efficient, versatile, rapid, and high-resolution assessment of anomalous drainage basins, resulting in the selection of a priority target for direct follow-up sampling aimed at estimating grade and evaluating resources.