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Dey, Sukanta
- Geochemistry of Shales from the Proterozoic Intracratonic Kaladgi- Badami Basin, Karnataka, Southern India as an Indicator of Palaeoweathering and Evolution of the Dharwar Craton
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1 Atomic Minerals Directorate for Exploration and Research, Begumpet, Hyderabad - 500 016, IN
2 Atomic Minerals Directorate for Exploration and Research, Madhavadhara, Visakhapatnam - 530 018, IN
3 Atomic Minerals Directorate for Exploration and Research, Department of Geological Sciences, Jadavpur University, Kolkata - 700 032, IN
1 Atomic Minerals Directorate for Exploration and Research, Begumpet, Hyderabad - 500 016, IN
2 Atomic Minerals Directorate for Exploration and Research, Madhavadhara, Visakhapatnam - 530 018, IN
3 Atomic Minerals Directorate for Exploration and Research, Department of Geological Sciences, Jadavpur University, Kolkata - 700 032, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 4 (2008), Pagination: 483-501Abstract
Shales of the Proterozoic Kaladgi Supergroup, occupying the intracratonic Kaladgi-Badami Basin in the Dharwar craton, are analyzed for mineralogical as well as major and trace element compositions. Field setting and elemental ratios, critical to provenance, indicate (1) major contribution from highly weathered Archaean silicic source rocks like Peninsular Gneiss and Closepet Granite, (2) the shales lack any systematic time-dependent variation of composition and (3) they record normal weathering history. Compared to the middle Archaean cratonic shales of the Dharwar craton, the Kaladgi shales are enriched in K2O, Th, La, Ce and Yb and depleted in MgO, Cr and Ni suggesting secular change in the Cpper crustal composition towards more felsic nature. The middle Archaean shales document acid leaching as an important weathering process, whereas the Kaladgi shales reflect intense weathering of the source similar to that of present day warm humid climate. In contrast to the extreme variability of the middle Archaean shales, the Kaladgi shales show smaller compositional variation suggesting development of Iarger platformal environment suitable for repeated recycling and efficient mixing. During late Archaean crustal growth, emplacement of juvenile granites into the crust and subsequent intracrustal melting has transferred huge amount of incompatible elements into the upper continental crust. The effect of ths change is clearly imprinted in the evolved composition of the Kaladgi shales.Keywords
Shale, Geochemistry, Proterozoic, Kaladgi Supergroup, Palaeoweathering, Upper Crustal Composition.
- Widespread Arkose along the Northern Margin of the Proterozoic Kaladgi Basin, Karnataka: Product of Uplifted Granitic Source or K-metasomatism?
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1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Nagarabhavi, Bangalore-560072, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begumpet, Hyderabad-500016, IN
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Nagarabhavi, Bangalore-560072, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begumpet, Hyderabad-500016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 1 (2008), Pagination: 79-88Abstract
The basal conglomerate and sandstone all along the northern margin of the Proterozojc Kaladgi basm are highly enriched in K-feldspar ranging m size from sand to pebble They are believed to have undergone K-metasomatism by earlier workers However, the present study shows that K-feldspar grains present in these rocks are predominantly temgenous detrital This is indicated by sympathetic relation between constituent quartz and feldspar in size, presence of fresh rounded microcline with or without authigenic overgrowth, typical arkosic texture and geochemistry of the rocks, and their sharp erosional contact with the underlying granitoids An uplifted, restncted source, dominantly consisting of K-rich granitoids and pegmatites to the north of the basin supplied the immature arkosic detritus possibly under humid and warm climatic condition The testimony for the presence of a highly K-rich source weakens the theory of K-metasomatism in the Kaladgi basin as proposed by some earlier authors.Keywords
Arkose, Petrography, Geochemistry, Provenance composition and tectonism, Kaladgi Basin, Karnataka.- Geochemistry of Granitoids of Bilgi Area, Northern Part of Eastern Dharwar Craton, Southern India - Example of Transitional TTGs Derived from Depleted Source
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Authors
Affiliations
1 Department of Atomic Energy, Begumpet, Hyderabad - 500 016, IN
2 Department of Atomic Energy, Nagarabhavi, Bangalore - 560 072, IN
1 Department of Atomic Energy, Begumpet, Hyderabad - 500 016, IN
2 Department of Atomic Energy, Nagarabhavi, Bangalore - 560 072, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 73, No 6 (2009), Pagination: 854-870Abstract
Mildly deformed granitoids exposed around Bilgi in the northernmost part of the eastern Dharwar craton are divided into two groups viz. granodiorites and monzogranites. The granodiorites contain microgranular enclaves and amphibolite xenoliths, and show low-Al TTG affinity with high SiO2 (71-74 %), Na2O, Y and Sr/Y, moderate to moderately high Mg#, Cr and Ni, low to moderate LILE, and low Nb and Ta. However, compared to similar TTGs from different cratons the Bilgi granodiorites have distinctly higher K2O, K2O/Na2O, Rb and lower REE and Th. The amphibolite xenoliths are characterized by variable enrichment of K2O, Rb, Ba and Th and depletion of Ti, Zr and P compared to MORB. The microgranular enclaves are quartz diorite to granodiorite in composition with high Mg, Ni and Cr, and compared to MORB, are enriched in LILE and depleted in Ti and Y. The monzogranites, compared to the granodiorites, display higher SiO2, K2O and Rb with lower Mg#, although still maintaining the high Na2O, Ni and Cr and low REE character.The Bilgi granodiorites are explained as transitional TTGs late synkinematic with respect to regional deformation. Geochemical signatures and regional geological set up suggest that they are probably derived from partial melting of a highly depleted slab material (metabasalt) followed by variable contamination or assimilation of intermediate crustal rocks in a subduction zone set up. Late stage fluid activity on the granodioritic magma is probably responsible for the generation of monzogranites. The amphibolite xenoliths predate the granodiorites and possibly represent fragments of a schist belt carried away by the granitic magma. They are probably island arc basalt derived from mantle source that has been metasomatized by slab-derived fluids. The microgranular enclaves are coeval with the Bilgi granodiorites and also likely to be island arc magmas derived from mantle variably enriched in slab-derived and within-plate components.
Keywords
Transitional TTG, Petrography, Geochemistry, Petrogenesis, Geodynamic Setting, Dharwar Craton.References
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- Palaeo-Coastal Morphology of the Neoproterozoic Badami Basin - some Field Evidences from Khanapur, Bagalkot District, Karnataka
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Authors
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1 Atomic Minerals Directorate for Exploration and Research, Nagarabhavi, Bangalore - 560 072, IN
1 Atomic Minerals Directorate for Exploration and Research, Nagarabhavi, Bangalore - 560 072, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 60, No 5 (2002), Pagination: 579-582Abstract
The Neoproterozoic Badami Group of the Kaladgi-Badami basin consists of an undisturbed sequence of sandstone, shale and limestone exposed in the northern districts of Karnataka and adjoining parts of Maharashtra (Viswanathiah, 1977; Jayaprakash et al. 1987). The sequence unconformably overlies Archaean granitoids, schists and the Mesoproterozoic Bagalkot Group of sediments. The environment of deposition of the Badami Group has been interpreted as shallow marine (Sathyanarayan, 1994). This note presents some field evidences around Khanapur village, Bagalkot district revealing the nature of palaeo-coas tal morphology during the deposition of Cave Temple arenite (CTa), the main sandstone member of the Badami Group.Full Text