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Bhattacharya, D.
- Three-Phased Temporal Evolution of the Jhirgadandi Granite Complex, Sonbhadra District, Uttar Pradesh
Authors
1 Department of Geology, Lucknow University, Lucknow, IN
2 48 Pandariba, Lucknow - 226 004, IN
3 AMD/DAE, NR, West Block - 7, R K Puram, New Delhi - 110 066, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 2 (2008), Pagination: 281-282Abstract
No Abstract.- A Note on Carbonate Rock with Igneous Affinity from Jungel Valley, Sonbhadra District, Uttar Pradesh, Central India
Authors
1 Atomic Minerals Directorate for Exploration and Research, NR, New Delhi - 110 066, IN
2 Flat No. B-170, Kendnya Vihar, Sector-51, Noida, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 6 (2008), Pagination: 808-814Abstract
The Lower Proterozotc (1800-2400 Ma) Jungel Valley mafic-ultramatic complex (JVMUC) is an integral pait of Mahakoshal greenstone belt in district Sonbhadra. The complex is known for its diversity of locks like alkali olivine basalt, kimbeihte and ultramalic lamprophyre. In addition to these, a carbonate rich rock having igneous affinity is being reported for the first time from this complex High CaO, CO2, Sr and Ce with low SiO,, A12O8 and TiO2 characterise this rock. However, these rocks are not significantly enriched in incompatible elements and REE, implying that these may have possibly formed by partial melting of a depleted mantle at shallow depth. The geochemical characters combined with association of mantle derived rocks, presence of high level of carbonate in the lamprophyre and absence of sedimentary limestone in the area point towards an igneous origin, probably as a residual concentrate of a differentiated Kimberlite-Ultramahc lamprophyre sequence Sr isotope data, which fall well within the range of reported carbonatites of India, suggest moderate crustal contamination. The mafic-ultramafic suite together with the carbonate rocks developed in Son-Naimada nit zone are interpreted to be coeval with the intrusive syenite pluton, alkali gabbio and lamprophyres of the adjoining areas and is related to the development of Mahakoshal greenstone belt.Keywords
Jungel Valley, Caibonate Lamprophyre, Mahakoshal Greenstone Belt, Uttar Pradesh.- Three-Phased Temporal Evolution of the Jhirgadandi Granite Complex, Sonbhadra District, Uttar Pradesh
Authors
1 Atomic Minerals Directorate for Exploration and Research, New Delhi-11 0066, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 5 (2007), Pagination: 730-744Abstract
Field observations, petromineralogical and geochemical studies on the locks of Jhirgadanpdi pluton indicate three phases of igneous activity, compositionally ranging from gianodiorite, Quartz-Monzonite to granite. The wide spread intermediate phase of this suite shows anomalous concentration of U, Ce and Th as compared to average granite and enrichment of K, Rb, Ba relative to Zr, Nb and Y. The radioactive minerals identified are thorite, uranothorite, allanite monazite and samaiskite Molybdenite and chalcopyite are the other are minerals Presence of REE (1 are earth element) minerals, distibution pattern of LIL (large Ion lithophile) elements, various elemental ratios and increasing metaluminous tendency indicate moderate degree of differentiation Petromineralogical study of rocks suggests partial melting of a magic source of lower crustal rocks Geochemical data suggests that the granitic rocks of the three phases are comagmatic. Available age data together with tectonic considerations indicate that the magmatic activity is relaled to the development of Mahakoshal greenstone belt which might have culminated with the emplacement of Post-Tectonic Jhirgadandi sulte (∼ 1800 Ma), possibly under the influence of a mantle plume.Keywords
Jhirgadandi Granite Post-Tectonic, Mantle Plume Radloactive Minerals Sonbhadra District, Uttar Pradesh- Geochronology of the Granitoids of the Kunjar Area, Sundergarh District, Orissa: Implications to the Regional Stratigraphy
Authors
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy Bangalore - 560 072, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy NewDelhi - 110 066, IN
3 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy Hyderabad 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 4 (2005), Pagination: 428-440Abstract
Rb-Sr isotopic data for the Tamparkola granite, northwest of Bonaigarh, and Bamra granite, southeast of Barnra, Sundergarh district, Orissa have yielded similar ages of 2746𫏸 Ma and 2738±28 Ma, respectively. Small granite exposures intruding the Iron Ore Group in the southern part of Tamparkola granite, have also indicated similar Whole Rock Rb-Sr age of 2867䕺 Ma. These may be correlated with the Bonai granite. Significant crustal component was involved in the generation of these granites, as indicated by high initial Sr ratio, and their emplacement probably marks a major terminal cratonisation event in northwestern part of the Singhbhum-North Orissa Craton.
Ths study does not support the view that the Tamparkola Granite is equivalent to the Itrna/Ekma granites that are intrusive into the Gangpur Group. These age results call for a revision of the stratigraphy of the Bonai-Gangpur tract, in that the Darjing Group unconformably overlies both the Bonai granite and Tamparkola granite, with the Mesoproterozoic Kunjar sedimentary sequence representing the youngest of the regional succession.
Keywords
Rb-Sr isotopics, granites, stratigraphy, Kunjar basin, Darjing Group, Gangpur Group, Sundergarh District, Orissa.- On the Occurrence of Rocks of Lamproitic Affinity in Singhbhum Granite, near Rajnagar-Tiring Area, District East Singhbhum, Jharkhand
Authors
1 Marine Wing (HQ). GSI, Kolkata, Bhubijnan Bhawan, Karunamoyee, Salt Lake, Kolkata - 700 091, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 66, No 1 (2005), Pagination: 15-16Abstract
This note records the occurrence of a lamproitic body traversing the Archaean greenstone belt in Singhbhum craton near Rajnagar-Tiring area in east Singhbhum district of Jharkhand. This discovery opens up new vistas of search for similar rocks in this region.Keywords
Lamproites, Singhbhum Granite, Rajnagar Tiring Area, Jharkhand.- Three-Phased Temporal Evolution of the Jhirgadandi Granite Complex, Sonbhadra District, Uttar Pradesh
Authors
1 Flat B-203, Block-B, Unite Avenue Apts, South End, 7-1-29, Ameerpet, Hyderabad - 500 016, IN
2 AMD/DAE, NR West Block-7, R K Puram, New Delhi - 66, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 3 (2008), Pagination: 437-438Abstract
No Abstract.- A Note on the Uranium Mineralisation along Jamual-markundi Fault, Sonbhadra and Sidhi Districts, Uttar Pradesh and Madhya Pradesh
Authors
1 Atomic Minerals Directorate for Exploration and Research, New Delhi-110066, IN
2 Atomic Minerals Directorate for Exploration and Research, Jaipur -302030, IN
3 Atomic Minerals Directorate for Exploration and Research, 313/4, Sector-56, Rail Vihar, Gurgaon, Haryana, IN