NDLI: Petrology of the Udayagiri anorthosite complex, Eastern Ghats Belt, India

Content Provider	Springer Nature Link
Author	Mahapatro, S. N. Tripathy, A. K. Nanda, J. K. Rath, S. C.
Copyright Year	2013
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 (∼An$_{50–60}$), moderately magnesian intercumulus olivine (X$_{Mg}$: ∼0.6) and orthopyroxene (X$_{Mg}$: 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.
Starting Page	319
Ending Page	329
Page Count	11
File Format	PDF
ISSN	00167622
Journal	Journal of the Geological Society of India
Volume Number	82
Issue Number	4
e-ISSN	09746889
Language	English
Publisher	Springer India
Publisher Date	2013-10-13
Publisher Place	India
Access Restriction	Subscribed
Subject Keyword	Anorthosite Leuconorite Corona Eastern Ghats Belt Udayagiri Orissa Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Geology

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