Origin of Spinel + Quartz Assemblage in a Si-undersaturated Ultrahigh-temperature Aluminous Granulite and its Implication for the P–T–fluid History of the Phulbani Domain, Eastern Ghats Belt, India

Geological evolution of the northern and northwestern Eastern Ghats Belt, India from metamorphic, structural and geochronological records: An appraisal

“…This appears to be true also for the Phulbani area which was affected by UHT metamorphism along a near-isobaric prograde and retrograde P-T path at~0.99 Ga (Fig. 3b) (Ganguly et al, 2017(Ganguly et al, , 2018. The similarities in the metamorphic and geochronological data from both the above areas, therefore, indicate that these two areas evolved together and possibly were attached to each other during the proposed time-frame.…”

“…This interpretation is based on the Moho offsets in the tune of~5 km across the crustal domain boundaries of Dobmeier and Raith (2003). However, such an assumption appears to be inconsistent with the recent geological and geochronological data (Ganguly et al, 2017(Ganguly et al, , 2018.…”

“…This area occupies a major portion of the northern EGB but A d v a n c e P u b l i c a t i o n A r t i c l e remained mostly unexplored barring sporadic geochronological data from charnockitic and metapelitic rocks (Paul et al, 1990;Upadhyay et al, 2009). Based on the textural study, thermobarometry and phase diagram modeling, recently Ganguly et al (2017) suggested that the area also experienced peak UHT condition (1000°C,~8 kbar) similar to the Chilka Lake domain. Texturally constrained monazite ages obtained from aluminous granulite exposed in the Phulbani area, additionally, suggest that the UHT metamorphism occurred at~0.99 Ga (Ganguly et al, 2018).…”

“…These shear zones include Mahanadi Shear Zone (MSZ) and Ranipathar Shear Zone (RSZ) at the north and Nagavalli-Vamshadhara Shear zone (NVSZ) at the central part of the EGP. Recently, Ganguly et al (2017Ganguly et al ( , 2018 pointed out the problem of the domain-based classification of the EGP and concluded that the shear zones should not be considered as domain boundaries. Accordingly, the individual 'domains' are henceforth termed as 'areas' of which the Visakhapatnam is most well-constrained in terms of petrological and geochronological aspects (Dasgupta et al, 2017 and references therein).…”

“…The geological history of the Chilka Lake area is also well known (Sen et al, 1995;Dasgupta and Sengupta, 2003;Chatterjee et al 2008;Bose et al, 2016b), but due to the differences in petrological and geochronological characters with other areas of the EGP, it is considered as a separate domain in the present review. The Phulbani area remained unexplored for a long time until recent works of Ganguly et al (2017Ganguly et al ( , 2018. Studies from the other areas which include the Rampur, Khariar, Tikarpara, and Angul (Sarkar et al, 2007) are also scanty.…”