Exploration for concealed fracture controlled uranium mineralization: A case from Shivaramapuram-Nutankalva tract in basement granitoids, south of Cuddapah basin, Andhra Pradesh, India

Goswami, Sukanta; Tiwari, Ravi Prakash; Maurya, Vinod Kumar; Natarajan, V.; Saravanan, B.; Bhatt, A. K.; Verma, M.B.

doi:10.1016/j.gexplo.2020.106710

Cited by 5 publications

(3 citation statements)

References 23 publications

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“…The structural relationships among different features in the EDC are well recognized by geologists (e.g., Chadwick et al, 2000, 2007; Chardon et al, 2008; Chardon & Jayananda, 2008; Goswami et al, 2017, 2019,b; Mukhopadhyay, 1986). The superimposed deformation, geometrical relationships, and behaviour of structures during refolding by different mechanisms are also explained.…”

Section: Geology and Structurementioning

confidence: 93%

“…The dykes are emplaced along different trends, viz, N–S, NW–SE, E–W, and NE–SW. Most of the dykes are doleritic to porphyry basalt in composition (Belica et al, 2014; French & Heaman, 2010; Goswami et al, 2019,b; Nagaraju, Parashuramulu, Babu, & Narayana, 2018). Over this Archaean granitoids, greenstone belts and Proterozoic dykes widespread platform sedimentation took place at 1.9–0.6 Ga which are now preserved within the platform type of basins like Cuddapah and Bhima.…”

Section: Geology and Structurementioning

confidence: 99%

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Migmatite rheology of crustal catazone: An example from theSSEpart of T. Sundupalle granite‐greenstone terrain, Eastern Dharwar Craton, India

et al. 2021

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The southern basement of the Cuddapah Basin comprises the Dharwar Batholith and greenstone belt complex. Granitoids of the batholith exhibit extensive variation in terms of geomorphology, age, mineralogy, and micro/meso scale structures. The eastern part of Dharwar Craton along 13°50′ to 14°8′N latitude and 78°45′ to 79°05′E longitude was studied to enlighten the rheological influence on crustal evolution. Frequent occurrences of migmatites of restricted dimension are observed in the south of 14°10′N latitude. The granite‐migmatite contacts are not sharp in general. Different types of migmatite complex and their relationships with granitoids as well as older country rocks represent an exhumed segment of the crustal catazone. The widespread group of migmatitic rocks are classified in a composite manner on the basis of morphology and structure. Furthermore, genetic implication vis‐a‐vis anatexis history is also evaluated. Static and dynamic modes of migmatites are recognized with reference to geothermal gradient and tectonics. Based on the degree of anatexis, two categories of migmatites are identified in the field, that is, metatexites and diatexites. In addition, metatexites are classified into four sub‐types (viz, patch, dilatant, net, and stromatic) and diatexites are also sub‐divided into two categories (viz, schollen or raft and schlieren). The hybrid nature of migmatitic rocks with both metamorphic and igneous characteristics are used to analyse pre‐ and post‐anatectic events. The preserved evidences of partial melting are marked as leucocratic patches. In situ stagnation of the melt or subsequent separation from the remaining solid provides different morphology of static mode. Importance of dihedral angle at solid–liquid contacts is also considered in the present context to describe the grain boundary penetration by partial melt. Folds, veins, and boudins of different styles and generations played significant role in dynamic mode migmatitization. The syn‐ and post‐metamorphic deformation events and granite melt generation from migmatites are schematically defined. Spatial and temporal relationships of schist‐gneiss‐migmatites of both static as well as dynamic mode reveal initiation of the crustal development by vertical accretion of ultramafic‐mafic lava and TTG. Cyclic partial remelting of the metabasic lava and TTG and underplating led to development of the lithospheric plate. Later upwelling material at convergent plate and associated heat transfer led to generation of granitic magma. The established prograde and retrograde cycle of metamorphism were possibly interrupted by crustal reworking events. This study confirms about the crustal catazone segment (with >15 km depth and >500°C) in which physical processes control generation, segregation, ascent, and emplacement of juvenile granite from migmatites.

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Section: Geology and Structurementioning

confidence: 93%

Section: Geology and Structurementioning

confidence: 99%

Migmatite rheology of crustal catazone: An example from theSSEpart of T. Sundupalle granite‐greenstone terrain, Eastern Dharwar Craton, India

et al. 2021

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“…The fractured zones affect the bore well yields, ranging from 1 to 3 lps. The fragmented zones reached from 0.1 to 4.9 lps (Goswami et al, 2021). Dolomites, limestones, quartzites, and shales dominate the Kadapa-Kurnool formations.…”

Section: Introductionmentioning

confidence: 99%

Agglomerative and Divisive hierarchical cluster analysis of groundwater quality variables using opensource tools over YSR district, AP, India

Mogaraju¹

2022

JSR

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Groundwater quality variables like F, Total Hardness (TH), Total Alkalinity (TA), Total Dissolved Solids (TDS), SO4, SAR, NA, EC, Cl, Ca, Mg, and pH were tested with Hierarchical clustering analysis (HCA) to identify the groupings or clusters that exist in the dataset. The dataset is subjected to Agglomerative and divisive hierarchical clustering. The observations were scaled to compare variables systematically. The clustering structure was determined using an agglomerative coefficient. Agglomerative approaches like complete, average, single, and ward are tested using agglomerative coefficients. The ward approach best suits the dataset to investigate a strong clustering structure. The agglomerative coefficient obtained is 0.8666752, and the divisive coefficient is 0.8371531. The entanglement score attained was 0.26, demonstrating a good alignment with nominal entanglement. The principal component analysis resulted in two main components contributing 54.8% and 18.2% explainable variance. The variables that are prominent in each PC are investigated and reported. The gap statistic and average silhouette method are used to know the optimal number of clusters. Open-source software like R/ R studio is used for this analysis. This work concludes that clustering analysis is essential to understand the groundwater quality variables better.

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Implication of deformation fabrics of schist-migmatite-gneiss and granite in understanding regional tectonics: Eastern Dharwar Craton (EDC), India

Goswami

Bhagat

Pande

et al. 2023

Proc.Indian Natl. Sci. Acad.

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Exploration for concealed fracture controlled uranium mineralization: A case from Shivaramapuram-Nutankalva tract in basement granitoids, south of Cuddapah basin, Andhra Pradesh, India

Cited by 5 publications

References 23 publications

Migmatite rheology of crustal catazone: An example from theSSEpart of T. Sundupalle granite‐greenstone terrain, Eastern Dharwar Craton, India

Migmatite rheology of crustal catazone: An example from theSSEpart of T. Sundupalle granite‐greenstone terrain, Eastern Dharwar Craton, India

Agglomerative and Divisive hierarchical cluster analysis of groundwater quality variables using opensource tools over YSR district, AP, India

Implication of deformation fabrics of schist-migmatite-gneiss and granite in understanding regional tectonics: Eastern Dharwar Craton (EDC), India

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