scholarly journals New constraints on the metamorphic evolution of the Eastern Ghats Belt, India, based on relict composite inclusions in garnet from ultrahigh-temperature sapphirine granulites

2010 ◽  
Vol 46 (2-3) ◽  
pp. 240-262 ◽  
Author(s):  
C. V. Dharma Rao ◽  
Reia M. Chmielowski
Keyword(s):  
Eastern Ghats ◽  
Metamorphic Evolution ◽  
Eastern Ghats Belt ◽  
Ultrahigh Temperature

scholarly journals Prismatine and ferrohögbomite-2N2S in granulite-facies Fe-oxide lenses in the Eastern Ghats Belt at Venugopalapuram, Vizianagaram district, Andhra Pradesh, India: do such lenses have a tourmaline-enriched lateritic precursor?

2003 ◽  
Vol 67 (5) ◽  
pp. 1081-1098 ◽  
Author(s):  
E. S. Grew ◽  
A. T. Rao ◽  
K. K. V. S. Raju ◽  
C. Hejny ◽  
J. M. Moore ◽  
...  
Keyword(s):  
South Africa ◽  
Andhra Pradesh ◽  
Granulite Facies ◽  
Eastern Ghats ◽  
Dehydration Melting ◽  
Fe Oxide ◽  
Eastern Ghats Belt ◽  
Fine Grained ◽  
Distinctive Type ◽  
Ultrahigh Temperature

AbstractFluorine-rich prismatine, (□,Fe,Mg)(Mg,Al,Fe)5Al4(Si,B,Al)5O21(OH,F), with F/(OH+F) = 0.36–0.40 and hercynite are major constituents of a Fe-Al-B-rich lens in ultrahigh-temperature granulite-facies quartz-sillimanite-hypersthene-cordierite gneisses of the Eastern Ghats belt, Andhra Pradesh, India. Hemo-ilmenite, sapphirine, magnetite, biotite and sillimanite are subordinate. Lithium, Be and B are concentrated in prismatine (140 ppm Li, 170 ppm Be, and 2.8 –3.0 wt.% B2O3). Another Fe-rich lens is dominantly magnetite, which encloses fine-grained zincian ferrohögbomite-2N2S, (Fe2+,Mg,Zn,Al)6 (Al,Fe3+,Ti)16O30(OH)2, containing minor Ga2O3 (0.30 –0.92 wt.%). Fe-Al-B-rich lenses with prismatine (or kornerupine) constitute a distinctive type of B-enrichment in granulite-facies rocks and have been reported from four other localities worldwide. A scenario involving a tourmalineenriched lateritic precursor affected by dehydration melting is our preferred explanation for the origin of the Fe-Al-B-rich lenses at the five localities. Whole-rock analyses and field relationships at another of these localities, Bok se Puts, Namaqualand, South Africa, are consistent with this scenario. Under granulite-facies conditions, tourmaline would have broken down to give kornerupine-prismatine (±other borosilicates) plus a sodic melt containing H2O and B. Removal of this melt depleted the rock in Na and B, but the formation of ferromagnesian borosilicate phases in the restite prevented total loss of B.

Aluminous sapphirine granulites from the Eastern Ghats Belt (India): Phase relations and relevance to counterclockwise P-T history

2006 ◽  
Vol 18 (1) ◽  
pp. 35-48 ◽  
Author(s):  
Suman Das ◽  
Abhijit Bhattacharya ◽  
Michael M. Raith ◽  
Subhadip Bhadra ◽  
Manua Banerjee
Keyword(s):  
Phase Relations ◽  
Eastern Ghats ◽  
Eastern Ghats Belt

The Eastern Ghats Belt, India, in the context of supercontinent assembly

2017 ◽  
Vol 457 (1) ◽  
pp. 87-104 ◽  
Author(s):  
Somnath Dasgupta ◽  
Sankar Bose ◽  
Santanu Kumar Bhowmik ◽  
Pulak Sengupta
Keyword(s):  
Eastern Ghats ◽  
Eastern Ghats Belt
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