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![X-ray elemental maps, of the tourmalines from the (a) Upper Bonai Group and (b–d) Gangpur Group.]()
![Major-element plots for tourmalines from (a, c, e, g) Upper Bonai Group granite pegmatite and (b, d, f, h) Gangpur Group granitoids. (a) The Mg concentration increases and X-site vacancy decreases in the type 2 tourmaline rim. (b) In the Gangpur Group the Mg concentration is lowest in the tourmalines from the pegmatite. (c, d) The variation in Fe and Mg concentration obtained from the granitoid tourmalines in Upper Bonai and Gangpur Group, respectively. (e, f) Al(T)+Al(Y) versus Mg+Si for the tourmalines in the granitoids from Upper Bonai and Gangpur Group. (g, h) Mg versus Ti for the granitoid tourmalines from Upper Bonai and Gangpur Group.]()
![(a) Chondrite-normalized REE plot for tourmalines from Upper Bonai Group granite pegmatite. The Fe-rich tourmaline shows clear Eu-negative anomaly, whereas the Mg-rich tourmaline displays Eu-positive anomaly. Bivariate plot of (b) Sn versus Sr, (c) Mn versus Ti and (d) Eu/Eu* versus Ca for tourmalines from Upper Bonai Group granite. Note the clear variation in trace-element composition of the Fe-rich and Mg-rich part. Bivariate plot of (e) Sc versus Co and (f) Li versus Zn for tourmaline grains from Gangpur Group granite.]()
![Backscattered electron (BSE) images of tourmaline grains documenting microtextural relations in granites and pegmatites, from the (a–c) Upper Bonai and (d–i) Gangpur groups. (a) Type 1 tourmaline grain intergrown with k-feldspar in Upper Bonai Group granite pegmatite; note the outer Mg-rich layer and the Fe-rich core. (b) Type 2 tourmaline grain intergrown with k-feldspar and quartz in Upper Bonai Group granite pegmatite. (c) Type 2 tourmaline with concentric zoned rim in Upper Bonai Group granite pegmatite. (d, e) Tourmaline intergrown with k-feldspar and quartz in Gangpur Group pegmatite. (f, g) Oscillatory zoned tourmaline crystals in the Gangpur Group granite. (h, i) Tourmalines in the Gangpur Group pegmatite showing oscillatory zoning and compositional variation from core to rim.]()
![Photographs illustrating field relations and mesoscopic structures in the S-type granites and pegmatites from the Upper Bonai and Gangpur Group granite and pegmatite: (a, b) Upper Bonai Group granite pegmatite; (c) Gangpur Group pegmatite, hosted in granite (note the graphic intergrowth of quartz and feldspar in the I-zone and the growth of tourmalines perpendicular to the pegmatite wall); and (d) older schist enclave in the Gangpur Group S-type granite.]()
![Bivariate plots of X-site vacancy versus Mg/(Mg+Fe) for tourmalines in the (a) Upper Bonai Group granite pegmatite; and (b) Gangpur Group granite and pegmatite.]()
![Bivariate plot of Mg/(Mg+Fe) versus δ11B for tourmalines from the granitoids of (a) Upper Bonai Group and (b) Gangpur Group. The data points are shown along with the error bars (2SE), representing the internal reproducibility for individual analysis.]()
![X-ray elemental images, photomicrographs and BSE images showing the variations of δ11B in different textural zones of tourmaline from the (a–c) Upper Bonai Group granite pegmatite (GNG-9); (d) Gangpur Group granite (GNG-45, 42); and (e, f) Gangpur Group pegmatite (GNG-11).]()
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![Tourmaline compositions from the Upper Bonai and Gangpur Group granitoids plotted in (a, b) triangular diagrams after Hawthorne & Henry (1999) and (c, d) the Al–Fe–Mg triangular diagrams.]()
![Summary of the paragenetic evolution of tourmalines in the Upper Bonai and Gangpur Group granitoids.]()
![(a–c) Probability density and histogram plots of δ11B ‰ values measured on tourmalines present in granitoids from the Upper Bonai and Gangpur Group. The two black arrows mark the range spanning the δ11B ‰ values reported in this study (0 to −20‰).]()
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X-ray elemental maps, of the tourmalines from the (a) Upper Bonai Group and...
in Tourmaline growth and evolution in S-type granites and pegmatites: constraints from textural, chemical and B-isotopic study from the Gangpur Schist Belt granitoids, eastern India
> Geological Magazine
Published: 05 April 2021
Fig. 4. X-ray elemental maps, of the tourmalines from the (a) Upper Bonai Group and (b–d) Gangpur Group.
Image
Major-element plots for tourmalines from (a, c, e, g) Upper Bonai Group gra...
in Tourmaline growth and evolution in S-type granites and pegmatites: constraints from textural, chemical and B-isotopic study from the Gangpur Schist Belt granitoids, eastern India
> Geological Magazine
Published: 05 April 2021
Fig. 6. Major-element plots for tourmalines from (a, c, e, g) Upper Bonai Group granite pegmatite and (b, d, f, h) Gangpur Group granitoids. (a) The Mg concentration increases and X-site vacancy decreases in the type 2 tourmaline rim. (b) In the Gangpur Group the Mg concentration is lowest
Image
(a) Chondrite-normalized REE plot for tourmalines from Upper Bonai Group gr...
in Tourmaline growth and evolution in S-type granites and pegmatites: constraints from textural, chemical and B-isotopic study from the Gangpur Schist Belt granitoids, eastern India
> Geological Magazine
Published: 05 April 2021
Fig. 11. (a) Chondrite-normalized REE plot for tourmalines from Upper Bonai Group granite pegmatite. The Fe-rich tourmaline shows clear Eu-negative anomaly, whereas the Mg-rich tourmaline displays Eu-positive anomaly. Bivariate plot of (b) Sn versus Sr, (c) Mn versus Ti and (d) Eu/Eu* versus Ca
Image
Backscattered electron (BSE) images of tourmaline grains documenting microt...
in Tourmaline growth and evolution in S-type granites and pegmatites: constraints from textural, chemical and B-isotopic study from the Gangpur Schist Belt granitoids, eastern India
> Geological Magazine
Published: 05 April 2021
Fig. 3. Backscattered electron (BSE) images of tourmaline grains documenting microtextural relations in granites and pegmatites, from the (a–c) Upper Bonai and (d–i) Gangpur groups. (a) Type 1 tourmaline grain intergrown with k-feldspar in Upper Bonai Group granite pegmatite; note the outer Mg
Image
Photographs illustrating field relations and mesoscopic structures in the S...
in Tourmaline growth and evolution in S-type granites and pegmatites: constraints from textural, chemical and B-isotopic study from the Gangpur Schist Belt granitoids, eastern India
> Geological Magazine
Published: 05 April 2021
Fig. 2. Photographs illustrating field relations and mesoscopic structures in the S-type granites and pegmatites from the Upper Bonai and Gangpur Group granite and pegmatite: (a, b) Upper Bonai Group granite pegmatite; (c) Gangpur Group pegmatite, hosted in granite (note the graphic intergrowth
Image
Bivariate plots of X-site vacancy versus Mg/(Mg+Fe) for tourmalines in the ...
in Tourmaline growth and evolution in S-type granites and pegmatites: constraints from textural, chemical and B-isotopic study from the Gangpur Schist Belt granitoids, eastern India
> Geological Magazine
Published: 05 April 2021
Fig. 7. Bivariate plots of X-site vacancy versus Mg/(Mg+Fe) for tourmalines in the (a) Upper Bonai Group granite pegmatite; and (b) Gangpur Group granite and pegmatite.
Image
Bivariate plot of Mg/(Mg+Fe) versus δ 11 B for tourmalines from the granito...
in Tourmaline growth and evolution in S-type granites and pegmatites: constraints from textural, chemical and B-isotopic study from the Gangpur Schist Belt granitoids, eastern India
> Geological Magazine
Published: 05 April 2021
Fig. 9. Bivariate plot of Mg/(Mg+Fe) versus δ 11 B for tourmalines from the granitoids of (a) Upper Bonai Group and (b) Gangpur Group. The data points are shown along with the error bars (2SE), representing the internal reproducibility for individual analysis.
Image
X-ray elemental images, photomicrographs and BSE images showing the variati...
in Tourmaline growth and evolution in S-type granites and pegmatites: constraints from textural, chemical and B-isotopic study from the Gangpur Schist Belt granitoids, eastern India
> Geological Magazine
Published: 05 April 2021
Fig. 8. X-ray elemental images, photomicrographs and BSE images showing the variations of δ 11 B in different textural zones of tourmaline from the (a–c) Upper Bonai Group granite pegmatite (GNG-9); (d) Gangpur Group granite (GNG-45, 42); and (e, f) Gangpur Group pegmatite (GNG-11).
Journal Article
Tourmaline growth and evolution in S-type granites and pegmatites: constraints from textural, chemical and B-isotopic study from the Gangpur Schist Belt granitoids, eastern India
Journal: Geological Magazine
Publisher: Cambridge University Press
Published: 05 April 2021
Geological Magazine (2021) 158 (9): 1657–1670.
...Fig. 4. X-ray elemental maps, of the tourmalines from the (a) Upper Bonai Group and (b–d) Gangpur Group. ...
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Location of the samples examined in this study from the Gangpur Schist Belt...
in Tourmaline growth and evolution in S-type granites and pegmatites: constraints from textural, chemical and B-isotopic study from the Gangpur Schist Belt granitoids, eastern India
> Geological Magazine
Published: 05 April 2021
Table 1. Location of the samples examined in this study from the Gangpur Schist Belt. Mineral abbreviations after Whitney & Evans ( 2010 ) Sample name Description Latitude N Longitude E Upper Bonai Group GNG-52 Granite/pegmatite 22° 5.4ʼ 84° 23.6ʼ GNG-9 Granite
Image
Tourmaline compositions from the Upper Bonai and Gangpur Group granitoids p...
in Tourmaline growth and evolution in S-type granites and pegmatites: constraints from textural, chemical and B-isotopic study from the Gangpur Schist Belt granitoids, eastern India
> Geological Magazine
Published: 05 April 2021
Fig. 5. Tourmaline compositions from the Upper Bonai and Gangpur Group granitoids plotted in (a, b) triangular diagrams after Hawthorne & Henry ( 1999 ) and (c, d) the Al–Fe–Mg triangular diagrams.
Image
Summary of the paragenetic evolution of tourmalines in the Upper Bonai and ...
in Tourmaline growth and evolution in S-type granites and pegmatites: constraints from textural, chemical and B-isotopic study from the Gangpur Schist Belt granitoids, eastern India
> Geological Magazine
Published: 05 April 2021
Fig. 12. Summary of the paragenetic evolution of tourmalines in the Upper Bonai and Gangpur Group granitoids.
Image
(a–c) Probability density and histogram plots of δ 11 B ‰ values measured o...
in Tourmaline growth and evolution in S-type granites and pegmatites: constraints from textural, chemical and B-isotopic study from the Gangpur Schist Belt granitoids, eastern India
> Geological Magazine
Published: 05 April 2021
Fig. 10. (a–c) Probability density and histogram plots of δ 11 B ‰ values measured on tourmalines present in granitoids from the Upper Bonai and Gangpur Group. The two black arrows mark the range spanning the δ 11 B ‰ values reported in this study (0 to −20‰).
Image
Boron isotope compositions of tourmaline from the Gangpur Schist Belt grani...
in Tourmaline growth and evolution in S-type granites and pegmatites: constraints from textural, chemical and B-isotopic study from the Gangpur Schist Belt granitoids, eastern India
> Geological Magazine
Published: 05 April 2021
Table 2. Boron isotope compositions of tourmaline from the Gangpur Schist Belt granites and pegmatites. Mineral abbreviations after Whitney & Evans ( 2010 ) Serial no. Domain Name 11 B (V) 11 B/ 10 B 2 × standard error δ 11 B (‰) 2 × standard error Upper Bonai Group
Book Chapter
2 An Overview of Geology of Odisha
Book: Geology of Odisha
Series: Text Book
Publisher: Geological Society of India
Published: 01 January 2022
DOI: 10.17491/bgsi.2022.9856.04
EISBN: 9789380998565
... and Rengali Province / Bastar Craton 1400-1600 Ma 1450 Ma - Metamorphism (II) 1477 Ma - Granite magmatism 1550 Ma - Metamorphism (I) 1450-1650 Ma - Sedimentation Kunjar Group (Age not known) Gangpur Group/Darjing / Upper Bonai Group (North Singhbhum Mobile Belt) Protolith of Khondalite Group (metapelite...
FIGURES
Journal Article
Regional Structural Analysis and Reinterpretation in the Bonai-Keonjhar Belt, Singhbhum Craton: Implication for Revision of the Lithostratigraphic Succession
Publisher: Geological Society of India
Published: 01 January 2015
Jour. Geol. Soc. India (2015) 85 (1): 26–36.
...J. P. Mohakul; S. P. Bhutia Abstract: The Mesoarchaean Iron Ore Group (IOG) of rocks in Bonai-Keonjhar belt is disposed in a horseshoe shaped synclinorium structure in the western part of the Singhbhum Craton. Morphology of this synclinorium is expressed by a near continuous western ridge...
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Journal Article
Lithostratigraphy of the Precambrian Rocks around Koira, Sundargarh District, Orissa
Publisher: Geological Society of India
Published: 01 March 1975
Jour. Geol. Soc. India (1975) 16 (1): 55–68.
... synclinorium with a well defined horse-shoe closure facing south in Bonai Subdivision, Sundargarh district, Orissa. Detailed mapping carried out by the authors in the southern part of the belt (in Bonai) has thrown new light on the stratigraphic relations of these rocks. The group is designated here the Koira...
Journal Article
Geochemistry and Age Constraints of post Iron Ore Supergroup Mafic-ultramafic Magmatism in Darjing Group and Bonai Granitoid Complex, North Odisha Singhbhum Craton, India
Publisher: Geological Society of India
Published: 01 February 2025
Jour. Geol. Soc. India (2025) 101 (2): 208–219.
... 01 2024 25 04 2024 25 04 2024 Copyright © 2025 Geological Society of India 2025 Geological Society of India Archean mafic-ultramafic magmatism Iron Ore Supergroup Post IOSG magmatism Singhbhum Craton Darjing Group and Bonai Granitoid Complex Tremolite–actinolite...
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Includes: Supplemental Content
Journal Article
On the Stratigraphy and Tectonic History of the Iron Ore Bearing and Associated Rocks of Singhbhum and Adjoining Areas of Bihar and Orissa
Publisher: Geological Society of India
Published: 01 June 1974
Jour. Geol. Soc. India (1974) 15 (2): 150–157.
.... Geological map of the Singhbhum granitic platform showing distribution of the iron ore bearing and associated rocks. The Noamundi group of rocks are made up of a lower formation of shale, phyllite and tuff, a middle formation of banded hematite jasper and an upper formation of manganiferous shale, phyllite...
Journal Article
Mode of Occurrence of Phosphorus in Iron Ores of Eastern Limb, Bonai Synclinorium, Eastern India
Publisher: Geological Society of India
Published: 01 June 2011
Jour. Geol. Soc. India (2011) 77 (6): 549–556.
...R. K. Upadhyay; S. Asokan; A. S. Venkatesh Abstract: The eastern limb of horse shoe shaped “Bonai Synclinorium” in India hosts Banded Iron Formations (BIFs), consisting of major high grade iron deposits. Phosphorus (P) gets adsorbed in the iron ore by way of ion exchange mechanism of clay minerals...
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