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Variation of strain pattern and its influence on the geometry of the uranium mineralized body in Bangurdih area, western part of the Singhbhum shear zone, eastern India

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Abstract

The mineralized (U bearing) rocks, near Bangurdih area, in the western part of the Singhbhum shear zone (SSZ) are strongly deformed and metamorphosed. The host and country rocks are mylonitic in nature with strong linear and planar fabrics. Surface studies indicate that the mineralized bodies are discontinuous in nature and occur sporadically. The thickness of the individual mineralized bodies is also not uniform. Present work is aimed at studying meso- and micro-scale deformational structures, their bearing on regional scale structure and their relation with the occurrences of U-mineralization in and around Bangurdih area. The area comprises predominantly of quartz–chlorite schist/quartz–chlorite–sericite schist with intercalated quartzite, meta-conglomerate and feldspathic schist of varying thickness. Apatite–tourmaline–magnetite-rich quartzite, chlorite schist and conglomerate are commonly radioactive. The uranium mineralized body at Bangurdih shows pinch-and-swell structure. Stretched thin quartz veins, observed within the sheared quartzite layers, have undergone layer parallel flow resulting in bidirectional pinch-and-swell structure lying on YZ and XZ sections of strain ellipsoid with their axes parallel and perpendicular to the shear lineation, respectively. Oriented samples were collected from quartz veins and the country rocks to prepare thin sections parallel to XY, YZ and XZ plane of strain ellipsoid from each sample for microstructural study. Aspect ratios of strain ellipses of XY, YZ and XZ sections are measured using Fry analysis. Flinn diagram shows that the rocks of the Bangurdih were subjected to bi-directional flattening (average k = 0.77), which indicates that in addition to simple shear deformation there is a shortening component perpendicular to the shear plane in this area. To correlate the strain pattern of Bangurdih with nearby areas, deformed pebbles from conglomeratic horizons and oriented samples of other rocks from Bhurkuli–Bundu and Rangamatia–Simulbera area were studied. Flinn diagram, prepared using all data, reveals that while the strain type in Bangurdih area shows intense flattening type of deformation, the Rangamatia–Simulbera area shows constrictional type of deformation (k values range from 0.57 to 0.88 and 1.02 to 2, respectively). Other locations (Bhurkuli–Bundu) in between Bangurdih and Rangamatia–Simulbera show both constriction and flattening type of strain (k values vary from 0.67 to 1.35). Therefore, it is concluded that the intense flattening type of simple shear deformation in Bangurdih area leads the ore rich layers to be stretched and detached in two directions (X and Y), which in turn, causes the mineralized body to occur intermittently with systematic trend on the surface and possibly in subsurface conditions too.

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Acknowledgements

We are grateful to the officers and staff members of the Atomic Minerals Directorate for Exploration and Research, Govt. of India for their support during the fieldwork. Constructive criticisms and suggestions from two anonymous reviewers and the Associate Editor, Joydip Mukhopadhyay helped to improve the manuscript, and are thankfully acknowledged. The research work was funded by the Board of Research in Nuclear Sciences (BRNS), Department of Atomic Energy, Govt. of India in the form of a project (No.: 2011/36/31-BRNS) to DCP and SKS.

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DCP conceptualized the study. SKS and DCP designed the study and prepared the visualization. SKS investigated and interpreted the data. SKS and DCP wrote the manuscript with input and editing by all authors. PB performed the measurements and statistical analyses. JKP and JP participated in collection of field data.

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Correspondence to Dipak C Pal.

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Communicated by Joydip Mukhopadhyay

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Samanta, S.K., Pal, D.C., Biswas, P. et al. Variation of strain pattern and its influence on the geometry of the uranium mineralized body in Bangurdih area, western part of the Singhbhum shear zone, eastern India. J Earth Syst Sci 130, 137 (2021). https://doi.org/10.1007/s12040-021-01651-w

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