Insights into the crustal architecture from the analysis of gravity and magnetic data across Salem-Attur Shear Zone (SASZ), Southern Granulite Terrane (SGT), India: an evidence of accretional tectonics

Ganguli, Shuva Shankha; Pal, Sanjit Kumar; Sundaralingam, K.; Kumar, Parveen

doi:10.18814/epiiugs/2020/020095

Cited by 18 publications

(1 citation statement)

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“…Hasan et al 53 performed an incorporated investigation of four geophysical methods (ERT, IP, SP and magnetic) methods coupled with RQD to investigate a hard rock site for successful installation of Accelerator Driven System (ADS) in South China. Ganguli et al 54 combined magnetic and gravity data to reduce ambiguity in the evaluation of crustal architecture across Salem Attur Shear Zone (India). Srivastava et al 55 carried out a time-lapse study of ERT and SP methods for old mine assessment in Raniganj Coalfield (India).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of rock mass units using a non-invasive geophysical approach

Hasan,

Shang,

Meng

2023

Sci Rep

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Thorough and accurate assessment of rock mass units is important for development of engineering infrastructures and groundwater resources assessments. Rock mass units are widely evaluated by reliable geomechanical parameters namely rock quality designation (RQD) and rock core index (RCI). Conventionally, these parameters are acquired via an extensive number of geotechnical tests. Such tests, however, suffer efficiency for data coverage, cost, equipment and topographic constrictions, and hence cause ambiguity in geological models for a detailed evaluation of rock mass integrity. Conversely, geophysical surveys offer fast, more user-friendly, less invasive, more cost-effective and less time-consuming approach for geological investigations. The past research confirms a useful link between geophysical and geotechnical parameters. But, none of the past studies provides a suitable and generalized relation between these parameters which can reduce geotechnical model uncertainty mostly caused by inadequate data and subsurface heterogeneity. This paper proposes a meaningful and feasible method to obtain geomechanical parameters using a certain number of drillings and geophysical data of four different sites. Based on electrical resistivity obtained from electrical resistivity tomography (ERT) and controlled-source audio-frequency magneto telluric (CSAMT), this research provides the general and adaptable formulas for geotechnical parameter estimation and reduces geological model uncertainty for more detailed 2D/3D imaging of RQD and RCI covering the whole sites where even no drilling data exists. Thus, the investigated sites are assessed laterally and vertically along each geophysical profile via distinct value ranges of geological parameters for a thorough and reliable evaluation of rock mass units in highly heterogeneous setting. Our research reduces the ambiguity caused by structural heterogeneities and scarce data, fills the gap between inadequate well tests and the true geological models, and gives new insights into the rock mass units for proper engineering design and groundwater exploitation.

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Section: Introductionmentioning

confidence: 99%