4.5 Article

Identifying gravity anomalies caused by granitic intrusions in Nanling mineral district, China: a multifractal perspective

期刊

GEOPHYSICAL PROSPECTING
卷 63, 期 1, 页码 256-270

出版社

WILEY
DOI: 10.1111/1365-2478.12187

关键词

Multifractal; Singularity index; Gravity; Granitic intrusions; Nanling

资金

  1. China Geological Survey [201211022]
  2. National Natural Science Foundation of China [41372007]
  3. Program for New Century Excellent Talents in University [NCET-13-1016]
  4. China Geological Survey Grant on The study on Yanshanian deep magmatic activity and complexity of large-scale mineralization in Nanling region [1212011121101]

向作者/读者索取更多资源

Several power-law relationships of geophysical potential fields have been discussed recently with renewed interests, including field value-distance (f-r) and power spectrum-wavenumber (P-) models. The singularity mapping technique based on the density/concentration-area (C-A) power-law model is applied to act as a high-pass filter for extracting gravity and magnetic anomalies regardless of the background value and to detect the edges of gravity or magnetic sources with the advantage of scale invariance. This is demonstrated on a synthetic example and a case study from the Nanling mineral district, Southern China. Compared with the analytic signal amplitude and total horizontal gradient methods, the singularity mapping technique provides more distinct and less noisy boundaries of granites than traditional methods. Additionally, it is efficient for enhancing and outlining weak anomalies caused by concealed granitic intrusions, indicating that the singularity method based on multifractal analysis is a potential tool to process gravity and magnetic data.

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