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- W2044902562 abstract "Charnockitic rocks of intrusive origin form an important lithological unit in the Eastern Ghat granulite belt, the others being khondalites, migmatites and anorthosites. The charnockitic rocks of the belt can be broadly divided into two groups based upon field relations and overall major- and trace-elemental chemistry: (1) basic granulites; and (2) charnockites. The charnockites comprise two distinct sub-groups. There is an overall increase of both K and Rb from the basic granulites to the charnockites, with few charnockites showing strong enrichment of both these elements. The two sub-groups in the charnockites can be distinguished by other elemental parameters like CaO, Y, V, Zr and FeOT. It is suggested that the protoliths for these charnockitic rocks are the fractionated products of a melt which was derived from metasomatised mantle and that a depletion event, probably coeval with granulite-facies metamorphism, has affected the entire terrain. This was followed by a metasomatic event which restored to some extent the depleted large-ion lithophile elements (LILE) to different levels in the different litho-units. The available rare-earth element (REE) data on these rocks support this mode of origin. Strong enrichment of K and Rb in one group of the charnockites indicates that they were subjected to post-metamorphic migmatisation/anatexis processes coupled with metasomatic processes, resulting in the abnormal K and Rb enrichment. The occurrence of numerous pegmatitic veins and migmatic gneisses in close proximity to these charnockites supports this conclusion." @default.
- W2044902562 created "2016-06-24" @default.
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- W2044902562 date "1988-06-01" @default.
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- W2044902562 title "Chemical constraints on the origin of the charnockites in the Eastern Ghat mobile belt, India" @default.
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- W2044902562 doi "https://doi.org/10.1016/0009-2541(88)90156-8" @default.
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