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Quartz reef investigation in India

Quartz reef is used for several applications in indusial purpose. 2D Electrical Resistivity Imaging (ERI) investigation is suitable method to determine the geotechnical problems and it is used for estimation of the high quality of quartz reef bed thickness. 2D Electrical Resistivity Imaging with Wenner array was conducted within the Quartz reef area in Varasanadu, Theni district, Tamilnadu. The geology of the study area contains red soil, quartz reef and weathered gneissic rock which signify good target for 2D electrical resistivity imaging techniques. The interpretation of the resistivity data along the profile shows the model of resistivity pseudo-section in quartz reef area. The highly resistivity zone range from 103 – 407 ohm.m at a depth of 4.06 m to 5.96m indicating the presence of hard quartz reef rock.


Interpretation for the ERT Line I : The profile  trends NW-SE direction to a length of 120 m. The upper part of the layer reveal as Quart reef deposits. The inversion resistivity values for these bed rock that ranges from 201 ohm.m to 27630 ohm.m.The resistivity values for intermediate layer of weathered Quart reef ranges from 28- 73.2 ohm.m. The lower part of the layer represents weathered composite gneiss with freshwater indicates low resistivity . values that ranges from 0.6979 to 11.3 ohm.m indicates alluvium deposit [1] due to the palaeo river channel; measuring a series of constant separation traverse with the increase of electrode spacing with each successive traverse. Quartz reef deposits in granulitic terrain at Varasanadu .



Interpretation for the ERT Line II :The profile (Fig.6) is trends to a length of 120m. The inversion displays the ranges by resistivity values from 7.45 Ohm.m . to 27.4 Ohm.m indicating that weathered soil up to a depth of 6m. The intermediate second layer exhibits resistivity values that ranges from 41.4 ohm.m to 130 ohm.m represents the weathered Quartz reef reef. The high  resistivity zone of pseudosection with range of resistivity is 200 to 10000 ohm.m at a depth 21.5m indicating the  quartz reef rock intrusion in the granulitic terrain .