Petrology of the Udayagiri Anorthosite Complex, Eastern Ghats Belt, India

Abstract

The Eastern Ghats Belt (EGB), characterised by pervasive Grenvillian granulite facies metamorphism, is the host to several 950-1000 Ma old massif-type anorthosite complexes. The present work describes one such complex near Udayagiri from the northern margin of the EGB, reported for the first time as “Udayagiri anorthosite complex” (UAC). The ‘massif type’ UAC comprises mainly of anorthosite, leuconorite-olivine leuconorite and norite in the decreasing order of areal extent. Mineralogically, these rocks dominantly consist of cumulates of moderately calcic plagioclase (∼An50-60), moderately magnesian intercumulus olivine (XMg: ∼0.6) and orthopyroxene (XMg : 0.47 to 0.70). Metamorphic garnet (Alm: ∼50 mol%) is also common in these rocks. Anorthosite and leuconorite of the UAC exhibit a moderate ‘+ve’ Eu anomaly. Norite occurs locally as schlierens and is relatively rich in Fe, P, Rb, Sr, Th, Nb, Ta, Y and REE which could be a residual melt product. These rocks exhibit both relict magmatic mineralogy and textures with a metamorphic impress manifested by the development of multilayered corona involving olivine, orthopyroxene, garnet, phlogopite, ilmenite and plagioclase during cooling of the pluton. The corona development is a result of combination of significant magmatic and metamorphic reactions which have the potential to provide important clues for deciphering the magmatic and metamorphic evolution of such plutons in ambient granulite facies conditions.

Geo-Hydro-Chemistry of Latosol Mineralogy: SMD and Western Catchment of Chilika Lagoon, India.

“…al., (2015) [15] reported that at present the GW in Khurdha district and particularly Bhubaneswar area is depleting year after year though not vulnerable to drinking water supply. Mohapatra et al, (2013) [16] , had mentioned about a moderate '+ve' Eu anomaly at Udayagiri in EGB hills. The soils are relatively rich in Fe, P, Rb, Sr, Th, Nb, Ta, Y, and REE's which could be a residual melt product.…”

In situ U–Th–Pbtotal dating of polychronous monazite in the Koraput anorthosite pluton, Eastern Ghats Granulite Belt (India), and implications

“…In the Grenvillian-age EGP comprising the WKZ, CMZ and EKZ, massif anorthosites occur at Chilka Lake (Sarkar, B hanumathi & B alasubrahmanyan, 1981; Bhattacharya, Sen & Acharyya, 1994; Mukherjee, Jana & Das, 1999; Krause et al . 2001; Dobmeier & Simmat, 2002; Chatterjee et al 2008), Bolangir (Tak, Mitra & Chatterjee, 1966; Tak, 1971; Mukherjee, Bhattacharya & Chakravorty, 1986; Raith, Bhattacharya & H oernes, 1997; Bhattacharya et al 1998; Mukherjee, Jana & Das, 1999; Krause et al 2001; Prasad et al 2005; Nasipuri & Bhattacharya, 2007; Nasipuri, Bhattacharya & Satyanarayanan, 2011; Nasipuri & Bhadra, 2013), Turkel (Maji, Bhattacharya & Raith, 1997; Maji & Sarkar, 2004; Raith et al 2014; Dharma Rao, Santosh & Zhang, 2014 a ), Jugsaipatna (Mahapatro, Nanda & Tripathy, 2010; Dharma Rao, Santosh & Zhang, 2014 b ), Koraput (Bose, 1960, 1979) and Udaigiri (Mahapatro et al 2013). The central parts of the plutons are dominated by anorthosite, whereas leuconorite and noritic anorthosite dominate the pluton margins.…”

18th World Lake Conference. Governance, Resilience and Sustainability of Lakes for a Better Society

“…Both cyclones acted significantly to disturb the Chilika lake ecosystem by churning the water column by re-suspending the bottom sediment through wind mediated large waves, fresh water influx from catchment and marine water ingress from the Bay of Bengal. Review of literature suggests that the knowledge on impact of tropical cyclone upon benthic marine life in shallow coastal lakes is scanty (Mahapatro et al, 2018a& 2018b, Mahapatro et al, 2019, Mahapatro et al, 2020a, Mahapatro et al, 2021.…”