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![Structural set up of the Remal granite-gneiss with fabric legends shown in the inset.]()
![Visible fabric elements in the Remal granite-gneiss. (a) Crystal rich rhythmic layers traced with solid blue lines which are planar/curviplanar. Leucocratic bands contain K-feldspar megacrysts and the base of each layer is defined by biotite schlieren. (b) Trough cross-bedded layers in the Remal granite-gneiss traced with yellow dotted lines, where individual cross-beds curve and truncate against the layers above and below. (c) Warping of the magmatic fabric by a sub-vertical shear fabric. (d) Plan view of the tectonic fabric defined by segregations of biotite. (e) Plan view of localized mylonite zones in the Remal granite-gneiss with segregations of epidote testifying to the low-temperature conditions of genesis of these zones. (f) A network of pegmatitic dykes within the Remal granite-gneiss.]()
![Photomicrographs of thin-sections from the Remal granite-gneiss: (a) Subhedral normally zoned inclusion of plagioclase in a K-feldspar phenocryst. (b) Biotite inclusions within a microcline phenocryst. The biotite grains are euhedral/subhedral and the embayed faces seen in biotite grains that define Sign and S1 are absent in the inclusions. (c) Boundaries of the trough cross-bedded layers defined by biotite segregations. Note the embayed faces of biotite grains perpendicular to cleavage and euhedral faces parallel to cleavage. (d) graphic intergrowth from the Sign domains. (e) Low magnification photomicrograph of Sign layers away from S1. The grain size is significantly larger, and subhedral to anhedral K-feldspar grains dominate with subordinate plagioclase and quartz. (f) Tectonic fabric S1 defined by biotite. (g) Photomicrograph of a mylonite within the Remal granite-gneiss. A distinct dextral drag of the S1 fabric is visible in the central portion of the photomicrograph.]()
![Thin section photomicrographs of the Remal granite gneiss (mineral abbreviations after Kretz, 1983). A: Low magnification image of the granite gneiss in which Sign is delineated with white dashed lines. The felsic layering is composed of large subhedral framework grains of quartz, K-feldspar and plagioclase. B: Subhedral, plagioclase lath with slightly embayed margins with a discrete zoned core. C: Anhedral interstitial grains of K-feldspar are intergrown with quartz to produce graphic textures. D: Crude alignment of biotite grains which defines the S1 gneissosity.]()
![Classification and geotectonic plots of whole-rock compositions from the Remal granite-gneiss. (a) TAS diagram after Cox et al. (1979). Analysed compositions fall in the granite field. (b) R1–R2 plot after Batchelor & Bowden (1985). The samples from the Remal granite-gneiss plot in the syn-collisional field. (c) Classification plot after Sylvester (1989) in which the Remal granite-gneiss samples plot in the calc-alkaline and strongly peraluminous field.]()
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![Simplified map of the southern part of the Singhbhum Craton modified after Saha (1994) and Mukhopadhyay & Matin (2020). The different litho-units which comprise the Singhbhum Craton are delineated with different colours according to the legend. The location of the Remal granite-gneiss is shown within a box.]()
![Schematic map of peninsular India with major terranes. The simplified study area in the inset is simplified from Misra and Gupta (2014). Note the location of the layered Remal granite gneiss (indicated with a black box) in the Singhbhum Craton, close to the contact with the Rengali Province.]()
![Pole figures of K-feldspar, plagioclase, quartz and biotite from the Remal granite-gneiss. The red line in the white ellipsoid at the base of the figure represents the trace of the magmatic fabric, which is inclined at an angle of 26° with respect to the horizontal. The yellow line in the same ellipsoid represents the S1 foliation, which is sub-vertical. The number of grains in the pole figures of K-feldspar, plagioclase and quartz are mentioned in brackets. For biotite pole figures, the number of orientations are mentioned in brackets. (a–f) Plot of orientations of large and small grains of K-feldspar, plagioclase and quartz from microlithon domains between the S1 tectonic fabric. (g) Biotite orientations from the Sign domain. (h–m) Plot of orientations of large and small grains of K-feldspar, plagioclase and quartz near the S1 tectonic fabric. (n) Biotite orientations from the S1 domain. Pole figures are plotted as equal-area projections. K-feldspar, plagioclase and quartz are plotted as mean orientation per grain whereas for biotite, all the indexed pixels have been plotted.]()
![Structural features of the Remal granite. A: Vertical section of the Remal granite showing cross beds and local folding of the layering by the biotite defined gneissosity, S1. B: The S1 gneissosity defined by biotite showing consistent orientation throughout the granite gneiss body. C: Erosion surfaces truncating the magmatic layers forming trough cross-beds. Note localized shears warp the foliation in their vicinity. D: Sign overprinted by the S1 gneissosity.]()
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Remal Granite Gneiss
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Journal Article
Origin of magmatic and tectonic fabrics in the Remal granite-gneiss, Singhbhum Craton, India
Journal: Geological Magazine
Publisher: Cambridge University Press
Published: 29 June 2022
Geological Magazine (2022) 159 (9): 1621–1637.
...Ritabrata Dobe; Zoja Vukmanovic; Narayan Bose; Mruganka Kumar Panigrahi; Saibal Gupta Abstract In the Singhbhum Craton of the Indian shield, the Remal granite-gneiss preserves felsic magmatic fabrics onto which a low-temperature segregation layering has been superposed. Planar, sub-horizontal...
FIGURES
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Journal Article
Discriminating Tectonic and Magmatic Fabrics in the Remal Granite Gneiss: Implications for Terrane Amalgamation Processes in Southeastern Singhbhum, India
Publisher: Geological Society of India
Published: 01 December 2018
Jour. Geol. Soc. India (2018) 92 (6): 657–660.
...Ritabrata Dobe; Saibal Gupta ABSTRACT The Remal granite gneiss body in the southeastern part of the Singhbhum Craton, near its contact with the Rengali Province, preserves two orthogonal penetrative foliations. The subhorizontal foliation defines cross and trough bedding structures...
FIGURES
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Image
Structural set up of the Remal granite-gneiss with fabric legends shown in ...
in Origin of magmatic and tectonic fabrics in the Remal granite-gneiss, Singhbhum Craton, India
> Geological Magazine
Published: 29 June 2022
Fig. 2. Structural set up of the Remal granite-gneiss with fabric legends shown in the inset.
Image
Visible fabric elements in the Remal granite-gneiss. (a) Crystal rich rhyth...
in Origin of magmatic and tectonic fabrics in the Remal granite-gneiss, Singhbhum Craton, India
> Geological Magazine
Published: 29 June 2022
Fig. 3. Visible fabric elements in the Remal granite-gneiss. (a) Crystal rich rhythmic layers traced with solid blue lines which are planar/curviplanar. Leucocratic bands contain K-feldspar megacrysts and the base of each layer is defined by biotite schlieren. (b) Trough cross-bedded layers
Image
Photomicrographs of thin-sections from the Remal granite-gneiss: (a) Subhed...
in Origin of magmatic and tectonic fabrics in the Remal granite-gneiss, Singhbhum Craton, India
> Geological Magazine
Published: 29 June 2022
Fig. 4. Photomicrographs of thin-sections from the Remal granite-gneiss: (a) Subhedral normally zoned inclusion of plagioclase in a K-feldspar phenocryst. (b) Biotite inclusions within a microcline phenocryst. The biotite grains are euhedral/subhedral and the embayed faces seen in biotite grains
Image
Thin section photomicrographs of the Remal granite gneiss (mineral abbrevia...
in Discriminating Tectonic and Magmatic Fabrics in the Remal Granite Gneiss: Implications for Terrane Amalgamation Processes in Southeastern Singhbhum, India
> Journal of the Geological Society of India
Published: 01 December 2018
Fig.4. Thin section photomicrographs of the Remal granite gneiss (mineral abbreviations after Kretz, 1983 ). A: Low magnification image of the granite gneiss in which S ign is delineated with white dashed lines. The felsic layering is composed of large subhedral framework grains of quartz, K
Image
Classification and geotectonic plots of whole-rock compositions from the Re...
in Origin of magmatic and tectonic fabrics in the Remal granite-gneiss, Singhbhum Craton, India
> Geological Magazine
Published: 29 June 2022
Fig. 7. Classification and geotectonic plots of whole-rock compositions from the Remal granite-gneiss. (a) TAS diagram after Cox et al . ( 1979 ). Analysed compositions fall in the granite field. (b) R 1 –R 2 plot after Batchelor & Bowden ( 1985 ). The samples from the Remal granite-gneiss
Image
Oxide compositions obtained from WD-XRF analyses of six samples from the Re...
in Origin of magmatic and tectonic fabrics in the Remal granite-gneiss, Singhbhum Craton, India
> Geological Magazine
Published: 29 June 2022
Table 2. Oxide compositions obtained from WD-XRF analyses of six samples from the Remal granite-gneiss LOI – loss on ignition.
Image
Simplified map of the southern part of the Singhbhum Craton modified after ...
in Origin of magmatic and tectonic fabrics in the Remal granite-gneiss, Singhbhum Craton, India
> Geological Magazine
Published: 29 June 2022
Fig. 1. Simplified map of the southern part of the Singhbhum Craton modified after Saha ( 1994 ) and Mukhopadhyay & Matin ( 2020 ). The different litho-units which comprise the Singhbhum Craton are delineated with different colours according to the legend. The location of the Remal granite
Image
Schematic map of peninsular India with major terranes. The simplified study...
in Discriminating Tectonic and Magmatic Fabrics in the Remal Granite Gneiss: Implications for Terrane Amalgamation Processes in Southeastern Singhbhum, India
> Journal of the Geological Society of India
Published: 01 December 2018
Fig.1. Schematic map of peninsular India with major terranes. The simplified study area in the inset is simplified from Misra and Gupta (2014) . Note the location of the layered Remal granite gneiss (indicated with a black box) in the Singhbhum Craton, close to the contact with the Rengali
Image
Pole figures of K-feldspar, plagioclase, quartz and biotite from the Remal ...
in Origin of magmatic and tectonic fabrics in the Remal granite-gneiss, Singhbhum Craton, India
> Geological Magazine
Published: 29 June 2022
Fig. 5. Pole figures of K-feldspar, plagioclase, quartz and biotite from the Remal granite-gneiss. The red line in the white ellipsoid at the base of the figure represents the trace of the magmatic fabric, which is inclined at an angle of 26° with respect to the horizontal. The yellow line
Journal Article
GEO volume 159 issue 9 Cover and Back matter
Journal: Geological Magazine
Publisher: Cambridge University Press
Published: 01 September 2022
Geological Magazine (2022) 159 (9): b1–b2.
... of the Palaeo-Asian Ocean Rong Chen, Feng Wang, Zhen Li, Noreen J Evans and Hongde Chen Origin of magmatic and tectonic fabrics in the Remal granite-gneiss, Singhbhum Craton, India Ritabrata Dobe, Zoja Vukmanovic, Narayan Bose, Mruganka Kumar Panigrahi and Saibal Gupta RAPID COMMUNICATION Seawater signatures...
Image
Structural features of the Remal granite. A: Vertical section of the Rema...
in Discriminating Tectonic and Magmatic Fabrics in the Remal Granite Gneiss: Implications for Terrane Amalgamation Processes in Southeastern Singhbhum, India
> Journal of the Geological Society of India
Published: 01 December 2018
Fig.2. Structural features of the Remal granite. A: Vertical section of the Remal granite showing cross beds and local folding of the layering by the biotite defined gneissosity, S 1 . B: The S 1 gneissosity defined by biotite showing consistent orientation throughout the granite gneiss body
