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Year 2026
 
Vol 67, Issue 2, [04 - 2026] - Full papers

Determination of density value in the Nong Son - Da Nang by Petrov's 3D gravity inversion

DOI:10.46326/JMES.2026.67(2).04

  • Affiliations:

    1 Hanoi University of Mining and Geology, Hanoi, Vietnam
    2 Geophysical Division,Vietnam Geological and Minerals Department, Hanoi, Vietnam
    3 University of Geology and Exploration named Sergo Ordzhonikidze, Moscow, Russia

  • *Corresponding:
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  • Received: 24th-Nov-2025
  • Revised: 17th-Feb-2026
  • Accepted: 14th-Mar-2026
  • Online: 1st-Apr-2026
Pages: 41 - 51
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Abstract:

The paper presents the results of Petrov’s 3D inversion applied to gravity data to determine the continuous distribution of rock density from the surface down to a depth of Z = 7250 m in the Nong Son - Da Nang area, supporting the delineation of potential zones associated with ore-forming processes. The inversion method was performed continuously on the residual gravity field using a two-dimensional “live-window” energy filter, with window sizes varying from 600÷8600 m. The reliability of the inversion results strongly depends on the accurate determination of residual gravity anomalies. Therefore, in this study, we apply a statistical-probabilistic approach to identify adaptive filter-window geometries that are consistent with the regional anomaly trend, thereby enhancing the accuracy of residual gravity anomaly separation. The results show that, at the southwestern ore-point locations, the subsurface rock density is heterogeneous, forming blocks with positive residual-density values ranging from 0.1÷0.35 g/cm³, corresponding to residual gravity anomalies of 1÷3.5 mGal. The residual density anomalies within local block structures at the ore-point sites extend to depths of approximately 4000 m. The density increases from about 2.25 g/cm³ at the surface to 3.05 g/cm³ at a depth of 7250m. In the ore-bearing zones, the density varies from 2.8 g/cm³ near the surface to 3.0 g/cm³ at depths of around 4000 m, forming a continuous band extending upward from depth toward near-surface levels. The interpretation results indicate potential mineralized zones associated with the upward migration and near-surface accumulation of magma-derived materials.

How to Cite
Phan, H.Thi, Do, P.Minh and Petrov, V.Aleksey 2026. Determination of density value in the Nong Son - Da Nang by Petrov's 3D gravity inversion. Journal of Mining and Earth Sciences. 67, 2 (Apr, 2026), 41-51. DOI:https://doi.org/10.46326/JMES.2026.67(2).04.
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