Preliminary magnetotelluric results across Dalma Volcanics, Eastern India: Inferences on metallogeny

Maurya, Ved P.; Shalivahan, _; Bhattacharya, B. B.; Adhikari, Purushottam; Das, L. K.

doi:10.1016/j.jappgeo.2015.02.021

Cited by 12 publications

(4 citation statements)

References 55 publications

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“…North of DVs hosts gold deposits (Dunn 1929;Dunn and Dey 1942;Gupta 2010;Deb 2014; Geological Survey of India (http://data.gov.in/ catalog/location-gold-deposits-india-and-itssalient -features\#web\ catalog\ tabs\ block\ 1)). There has been limited geophysical work in this area (Maurya et al 2015;Adhikari et al 2016). Maurya et al (2015) carried out MT studies over Singhbhum Group Metapelites (SGM), Dalma volcanics (DVs) and Singhbhum Group Quartzite and Pelites (SGQP) and detected shallow conductors beneath it which coincides well with the proven gold deposit (MECL 2010).…”

Section: Introductionmentioning

confidence: 99%

“…There has been limited geophysical work in this area (Maurya et al 2015;Adhikari et al 2016). Maurya et al (2015) carried out MT studies over Singhbhum Group Metapelites (SGM), Dalma volcanics (DVs) and Singhbhum Group Quartzite and Pelites (SGQP) and detected shallow conductors beneath it which coincides well with the proven gold deposit (MECL 2010). However, these conductors could not be delineated due to limited resolution of MT data.…”

Section: Introductionmentioning

confidence: 99%

“…However, these conductors could not be delineated due to limited resolution of MT data. The inductively coupled plasma atomic emission spectroscopy studies indicate the presence of Au, Ag, U and Cu as 0.75 ppm, traces, 22 ppm and 26 ppm, respectively (Maurya et al 2015). Adhikari et al (2016) carried out detailed electrical resistivity tomography (ERT) surveys over the detected conductor by MT studies (Maurya et al 2015) in the northern fringe of DVs.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Lithologic boundaries from gravity and magnetic anomalies over Proterozoic Dalma volcanics

Yadav

Adhikari²,

Srivastava

et al. 2018

J Earth Syst Sci

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Lithologic boundaries from gravity and magnetic anomalies over Proterozoic Dalma volcanics

Yadav

Adhikari²,

Srivastava

et al. 2018

J Earth Syst Sci

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“…Recently, Jha et al (2015) reported the occurrence of invisible gold within the North Singhbhum Mobile Belt of Singhbhum crustal province by petrographic, SEM and EPMA studies. Maurya et al (2015) reported evidences of Au-VMS in the northern fringe of Dalma Volcanics using Magnetotelluric/Audio magnetotelluric (MT/AMT) studies. Geological studies supported by geochemical results clearly established gold mineralization to be mainly associated with the quartz-pebble conglomerates (QPC) in Dhanjori basin (Haque and Dutta 1996).…”

Section: Introductionmentioning

confidence: 99%

Audio-magnetotelluric investigation of sulfide mineralization in Proterozoic–Archean greenstone belts of Eastern Indian Craton

et al. 2018

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Greenstone belts are well known for gold occurrences at different regions of the world. The Dhanjori basin in the eastern Singhbhum region shows major characteristics of a rifted greenstone belt. Initially, we conducted 14 audio-magnetotelluric (AMT) measurements for a profile of ∼20 km in the frequency range of 1 kHz to 10 Hz over this rather complex geologic environment covering Dhanjori Volcanics (DhV) and Kolhan Group (KG). Subsequently, gravity and magnetic surveys were also conducted over this AMT profile. The purpose of the survey was to identify and map conductive features and to relate them to metallogeny of the area along with the mapping of the basement of Dhanjori basin. The strike analysis showed N30 • W strike for DhV for all the frequencies and for sites over KG domain in the frequency range of 100-10 Hz, but for KG domain, the obtained strike in 1 kHz to 100 Hz is N45 • E. As the combination of transverse electric (TE), transverse magnetic (TM) and tipper (Tzy) can recover the electrical signature in complex geological environment, we discuss the conductivity model obtained from TE+TM+Tzy only. The inversion was carried for the regional profile with 14 sites and for 7 sites over KG domain. Conductivity model shows two well resolved conductors, one each in KG and Quartz Pebble Conglomerate Dhanjori (QPCD) domains respectively showing common linked concordant features between these regional and KG profiles. The conductors are interpreted as sulfide mineralization linked with QPCD group of rocks which may host gold. These conductors are also horizontally disposed due to the intrusive younger Mayurbhanj Granite. These intrusives correlate well with the gravity modeling as well. The thickness of the Dhanjori basin at the central is about 3.0 km, similar to that from gravity modeling. The conductivity model also indicates the presence of shallow conductors, but could not be resolved due to lack of high frequency data. However, the results from the close-by drill site indicate the presence of shallow sulfide mineralization hosting gold. The deep level conductors delineated from AMT studies are associated with gravity high and low magnetic. ICP-AES results of Dhanjori samples show significant concentration of gold ∼5.0 g/t, which is of economic consideration. Thus, it can be inferred that the conductors have evidences of sulfide mineralization which host gold.

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Magnetic and Radiometric Signatures over a Proterozoic Massive Sulfide Setting of Northern Fringe of Dalma Volcanics, Eastern India: An implication to Metallogeny

Yadav

Adhikari²,

Shalivahan

et al. 2017

Journal of the Geological Society of India

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Magnetic and radiometric surveys were carried out over a felsic dominated rifted margin of Proterozoic volcanic terrain of a mobile belt in the eastern India. The studies were made in blocks I and II of 0.65 sq km and 0.70 sq km respectively over a previously identified conductor in the northern fringe of Dalma Volcanics (DVs). In general, both the blocks show high magnetic signature associated with sulfide mineralisation. The interpretation of magnetic data suggests that nature of the causative source is mainly horizontal cylinder in both the blocks. The depth to the top of the causative source is about 25 m in both the blocks and extends upto 60 m in block I and 40m in block II. Gamma count rate exhibits about a factor of two to three enhancements above the field background for both the blocks. The obtained iso-rad maps are similar to uranium and copper belt in the Singhbhum shear zone south of the study area. The anomalous radiometric signature of the residual soil/rock of the area indicates towards hydrothermal alteration. The detailed magnetic surveys and preliminary iso-rads results seems quite encouraging and may be attributed to VMS setting in the area and potential sulfide mineralisation with uranium mineral association in the DVs province.

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Preliminary magnetotelluric results across Dalma Volcanics, Eastern India: Inferences on metallogeny

Cited by 12 publications

References 55 publications

Lithologic boundaries from gravity and magnetic anomalies over Proterozoic Dalma volcanics

Lithologic boundaries from gravity and magnetic anomalies over Proterozoic Dalma volcanics

Audio-magnetotelluric investigation of sulfide mineralization in Proterozoic–Archean greenstone belts of Eastern Indian Craton

Magnetic and Radiometric Signatures over a Proterozoic Massive Sulfide Setting of Northern Fringe of Dalma Volcanics, Eastern India: An implication to Metallogeny

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