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Ram Mohan, M.
- Petrogenesis of the Palaeoarchean Keonjhar Granite, Singhbhum Craton, India: Product of Crustal Reworking or Subduction?
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Authors
Affiliations
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
Source
Current Science, Vol 118, No 6 (2020), Pagination: 910-919Abstract
The early Archean represents an important eon in the evolution of the earth’s continental crust and could provide insights into the nature of geodynamic processes that operated during that period. The Singhbhum Craton from the Indian Shield is the only major archive of Palaeo–Mesoarchean geological processes. The Palaeoarchean granitoids from the Keonjhar area of Singhbhum Craton are potassic granites and granodiorites of calcalkaline affinity. Their age and elemental concentrations resemble the low Al2O3granites reported from the Eastern Pilbara Craton of Australia. The geochemical systematics of these granitoids suggests their derivation due to crustal reworking involving partial melting of a tonalitic source, possibly older metamorphic tonalitic gneiss (OMTG). The OMTG could have been derived due to the melting of an enriched basaltic source at the base of an oceanic plateau. In the second stage, the resultant underplating at crustal levels caused the reworking that led to intracrustal melting and differentiation of OMTG to form potassic granites, similar to that of Keonjhar pluton. Consolidating the evidences from the available geochemical and isotopic studies with our own data and correlating them with the geophysical evidences, we interpret that the Keonjhar granitoids are the product of intracrustal melting in an oceanic plateau setting.Keywords
Geodynamic Processes, Granitoids, Intracrustal Melting, Petrogenesis.Full Text
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- Rare Earth Elements of Sediments in Rivers and Estuaries of the East Coast of India
Abstract Views :251 |
PDF Views:101
Authors
Shaik Sai Babu
1,
R. Venkata Ramana
1,
V. Purnachandra Rao
1,
M. Ram Mohan
2,
S. Sawant
2,
N. Satyasree
1,
A. Keshav Krishna
2
Affiliations
1 Vignan’s Foundation for Science, Technology and Research, Deemed to be Vignan’s Univesity, Vadlamudi 522 213, IN
2 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
1 Vignan’s Foundation for Science, Technology and Research, Deemed to be Vignan’s Univesity, Vadlamudi 522 213, IN
2 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
Source
Current Science, Vol 120, No 3 (2021), Pagination: 519-537Abstract
The rare earth elements (REE) in the clay fraction of sediments in 15 rivers and their estuaries along the east coast of India were analysed in this study. The total REE content (ΣREE) varied from 130.98 to 289.85 μg/g and from 70.89 to 352.61 μg/g in rivers and estuaries respectively. The ΣREEs of estuarine clays (except the Brahmani and Baitarani) was lower than in rivers. The Post-Archean average Australian Shale-normalized REE patterns in rivers and estuaries were similar and categorized into three types. The REE patterns reflect the composition of dominant geological formations in river basins and extent of sediment mixing from different sources during transport. Hydrodynamic conditions controlled the abundance and fractionation of REE in the estuaries. The Sm/Nd ratios of clays were largely controlled by mineral composition and Y/Ho ratios were affected by sedimentary processes in the estuaries.Keywords
Estuaries, Rare Earth Elements, Rivers, Sediments, Volcanic Rocks.Full Text
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