- J. H. Crocket
- T. A. K. Reddy
- N. C. Pant
- M. N. Balasubrahmanyan
- M. K. Murty
- Amitabha Sarkar
- N. R. Sengupta
- S. V. P. Iyengar
- P. Kresten
- A. O. Brunfelt
- P. K. Bishui
- K. C. Chandy
- S. N. Gupta
- N. K. Jana
- R. Prasad
- Subhasish Ghosh
- S. Chakraborty
- J. K. Bhalla
- Amitabha Sarkari
- P.K. Bishui
- C. P. Vohra
- Sabyasachi Dasgupta
- S. Guha
- N. J. Mcnaughton
- S. Chattopadhyay
- K. K. Ray
- A. Basu
- A. K. Bhattacharya
- Brindaban Das
- A. K. Chaudhary
- Arijit Ray
- S. K. Patil
- S. K. Biswas
- S. S. Nayak
- N. R. Karmalkar
- R. A. Duraiswami
- N. V. Chalapathi Rao
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Paul, D. K.
- Petrology and Geochemistry including Platinum Group Element Abundances of the Mesoproterozoic Ultramafic (Lamproite) Rocks of Krishna District, Southern India: Implications for Source Rock Characteristics and Petrogenesis
Authors
1 Department of Geology, Presidency College, College Street, Calcutta - 700 073, IN
2 School of Geography and Geology, McMaster University, Hamilton, Ontario, L8S 4K1, CA
3 Geological Survey of India, Bandlaguda, Hyderabad - 500 068, IN
4 Geological Survey of India, Nh5p, Nit, Faridabad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No Spl Iss 3 (2007), Pagination: 577-596Abstract
A suite of potassic ultramafic rocks occurs in the Krishna district in the southern Indian craton along with clusters of kimberlite. The principal minerals include olivine, pyroxene, amphibole and phlogopite. Compositional variation exists in the phlogopite of the different occurrences of the region. Mg number varies from 0.37 to 0.56 and the groundmass phlogopites are enriched in Fe and Ti and poor in Al compared to the phenocrysts. Major and trace element data indicate enrichment of LILE and LREE (La/Yb = 24 - 104; Gd/Yb = 3.8 - 8.02). Ba contents vary from 132 to 5327 ppm, which is rather low compared to literature values for lamproite. However, the abundances of Zr (> 500 ppm), Sr (> 1000 ppm) and La (>200 ppm) are similar to those in the lamproite. The potassic ultramafic rocks have variable but high U/Pb (2-37, average 17.2) and Th/U (4.6-10.7) ratios. Concentrations of Platinum Group Elements (PGE) are quite variable with Ir, Pt and Pd varying by >9, 21 and 15 times respectively over the suite. Significant features include differences in fractionation between PGE and enrichment of Cu relative to the mantle source region. Some of the samples are not ultrapotassic and peralkaline. However, combining their mineralogical and geochemical properties, these rocks of the Krishna region may be considered as a member of the lamproite clan. There is no evidence of significant crustal contamination, but fractional crystallisation of olivine and perovskite is suggested from the geochemical relations. Available isotopic age data indicate that the ca. 1220 Ma old Krishna lamproite preceded kimberlite emplacement in the region by about 160 million years. Partial melting of a mantle metasomatically enriched in Ti and Fe would yield the Krishna lamproite magma. Amphibole contributed to the melt, but the HREE abundance data preclude garnet involvement. The depth of melt formation was likely to be shallower than that of kimberlites.Keywords
Lamproite, Proterozoic, Krishna District, Southern India, Platinum Group Elements, Petrogenesis.- K-Ar Ages of Indian Kimberlites
Authors
1 Geological Survey of India, Calcutta, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 19, No 12 (1978), Pagination: 584-584Abstract
No Abstract.- Lamprophyres from Indian Gondwanas - K-Ar Ages and Chemistry
Authors
1 Geochronology and Isotope Geology Division, Geological Survey of India, 29, Jawaharlal Nehru Road, Calcutta 700 016, IN
2 Chemical Laboratory, Geological Survey of India, 27, Jawaharlal Nehru Road, Calcutta 700016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 21, No 4 (1980), Pagination: 188-193Abstract
Lamprophyric dyke rocks occurring in the Indian Gondwanas (Permian-Lower Cretaceous) form a consanguinous suite ranging from ultrabasic mica-peridotite to micro-syenitic assemblages. Chemical characters include low SiO2 (ca. 40% or less), high (FeO+MgO) and high MgO/FeO and K2O/Na2O ratios. The petrographic and chemical characters have been discussed in a broad framework after Rock (1977). K-Ar radiometric ages on four biotite separates and one whole rock from three different localities range from 105 to 121 Ma and are believed to represent true crystallisation ages.- Geochemistry of the Precambrian Magmatic Rocks of Mayurbhanj District, Orissa
Authors
1 Geological Survey of India, Calcutta, IN
2 Mineralogisk-Geologisk Museum, Sarsgate, Oslo, NO
3 Mineralogical Museum Oslo, NO
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 22, No 7 (1981), Pagination: 305-315Abstract
In the Mayurbhanj area, Orissa, Badampahar group of rocks formed the cratonic block for younger Dhanjori Group. From the composition of the chilled facies of the gabbro-anorthosite, the parent magma is believed to be low in potash and alumina. The chondrite normalised REE pattern of the ultrabasic rock of Badampahar Group is unfractionated. In contrast, the gabbro-anorthosites have fractionated REE pattern with Eu anomaly. The degree of fractionation increases in the granite-granophyres. Th/U ratios systematically increase with the total REE content. It is suggested that the source region of the magmatic rocks is anomalous in respect of the large ion lithophile elements.- New Rb-Sr Age of Kanara Granite, South Kanara District, Karnataka State
Authors
1 Geochronology and Isotope Geology Division, Geological Survey of India, Calcutta, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 23, No 8 (1982), Pagination: 402-405Abstract
New Rb-Sr isotopic age is presented for the porphyritic phase of Kanara batholith of South Kanara, Karnataka. The porphyritic granite has a good spread of Rb/Sr ratio and indicates an isochron age of 2681 ± 236 Ma with an initial ratio of 0.7022 ± 0.004. The observed low initial Sr ratio suggests its derivation from mantle without much crustal contamination.- Principles of Nuclear Geology
Authors
1 Geological Survey of India, Calcutta, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 26, No 12 (1985), Pagination: 898-898Abstract
No Abstract.- Indian KimberIites and Lamprophyres: Mineralogical and Chemical Aspects
Authors
1 Geochronology and Isotope Geology Division, Geological SUlVey of India, Calcutta 700 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 37, No 3 (1991), Pagination: 221-238Abstract
Mineralogical, chemical and isotopic age and abundance data on Indian kimberlites and lamprophyres are discussed to show critical differences. The available K-Ar ages indicate that the kimberlites (840-1120 Ma) are much older than the lamprophyres (56.7-113 Ma). New whole-rock chemical analyses of the Majhgawan diatreme, the only producing diamond mine in India, suggest that fractionation of olivine and spinel has been important during its evolution. In general, the lamprophyres of the Gondwana coalfield bear geochemical similarity with the kimberlites. The source region for both rock types need to be enriched in incompatible elements but the lamprophyres are likely to have formed at shallower depth compared to the kimberlites.Keywords
Kimberlite, Lamprophyre, Lamproite, Majhgawan, Wajrakarur, Gondwana.- Geochronology and Geochemistry of Granite Plutons from East Khasi Hills, Meghalaya
Authors
1 Geochronology and Isotope Geology Division, Geological Survey of India, Calcutta-700 016, IN
2 Petrology Division, Geological Survey of India, North Eastern Region, Shillong, IN
3 Geochronology and Isotope Geology Division, Geological Survey of India, Calcutta - 700 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 37, No 4 (1991), Pagination: 331-342Abstract
Discordant granite plutons at Kyrdem, Nongpoh and South Khasi intrude the basement gneisses and the overlying Shillong Group of metasediments in the Meghalaya Plateau. Porphyritic granitoids ranging in composition from quartz monzonite to granite represent the dominant component in all the three plutons. Common characteristics of these granitoids arc spatial association with hornblende dioritic rocks, dominantly potassic and metaluminous nature. A positive correlation of SiO2, Na2O + K2O, Rb, Rb/Sr and negative correlation of CaO, MgO, FcO(T), Sr, TiO2 with Differentiation Index in the Kyrdcm pluton point to fractional crystallisation processes. Rb-Sr whole rock isochron data of the plutons yield ages in the range 480-690 Ma wiLh initia1 87Sr/86Sr ratios ranging from 0.70948 -0.71482. Absence of post emplacement tcctonolhennal event is suggested by near concordant K-Ar biotite ages.A protracted thennal event during late Proterozoic-early Palaeozoic (500-700 Ma), possibly related to mantle upwelling, possibly triggered the generation of these granitoids.
Keywords
Geochrmology, Geochemistry, Granitoids, Khasi Hills, Meghalaya.- Rb-Sr Chronology and Petrochemistry of Granitoids from the South-Eastern Part of the Singhbhum Craton, Orissa
Authors
1 Geological Survey of India, Calcutta - 700 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 38, No 1 (1991), Pagination: 5-22Abstract
The tonalitic suite of Kaptipada is high-Al2O3 type with a highly fractionated REE pattern suggesting its derivation by partial melting of amphibolite with hornblende as a residual phase. The homblende/biotite-bearing granites of Nilgiri and Ramapahari areas also occurring along the southeastern fringe,are comparatively K-rich than the lonalite-granodiorite suite of Kaptipada. Based on whole rock Rb-Sr isotopic analyses, lhe Kaptipada tonalite-granodiorite suite yields an age of 3275 ± 81 Ma with initial Sr ratio of O.70130± 0.00045; ... the Nilgiri granite, an age of 2366 ± 126Ma with initial Sr ratio of 0.72526 ± 0.00832 and Ramapahari granite, an age of 1895 ± 46 Ma wilh initial Sr ratio of 0.76521 ± 0.00427.
The temporal evolution of the tonalitic rocks of Kaptipada is indistinguishable from the earlier phases of Singhbhum and Bonai granitoids of the Singhbhum Craton. It is concluded that an extensive growth of tonalitic crust took place around 3.3 Ga in the region.
Keywords
Isotopic Study, Rb-Sr Chronology, Geochemistry, Tonalitic Granite, Crustal Evolution, Singhbhum Craton, Orissa.- Conference on 'Mesozoic Magmatism of the Eastern Margin of India'
Authors
1 Geological Survey of India, 15A & B, Kyd Street, Calcutta 700 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 40, No 2 (1992), Pagination: 194-194Abstract
No Abstract.- Geochronology and Geochemistry of the Lingtse Gneiss, Darjeeling - Sikkim Himalaya: Revisited
Authors
1 Indian School of Mines, Dhanbad - 826 004, Bihar, IN
2 Department of Geology and Geophysics, The University of Western Australia, Nedlands, W.A. 6907, AU
3 Geological Survey of India, 27, J.L. Nehru Road, Calcutta - 700016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 48, No 5 (1996), Pagination: 497-506Abstract
Foliated augen gneisses with streaky character, such as the Lingtse Gneiss of Sikkim-Darjeeling area, occur throughout the Himalaya. The Lingtse Gneiss is highly deformed and Occurs as thin tabular bodies. Considerable textural variation is noticed depending on the intensity of deformation and grain growth. The rocks are peraluminous and show fractionated REE pattern (Lan/Lun = 1.2-6.8). These gneisses were previously dated at 1075 and 2034 Ma by Rb-Sr method. The results of the present isotopic age determination by Rb-Sr and Pb/Pb methods indicate ages of 1678 ± 44 Ma and 1792 ± 45 Ma respectively. The variability and scatter of isotopic composition are believed to reflect imprints of tectono-thermal events.Keywords
Geochronology, Geochemistry, Lingtse Gneiss, Sikkim Himalaya.- Petrology and Geochemistry of the Lamprophyric Rocks from the Bokaro Coalfield, Bihar and their Economic Potential
Authors
1 Geological Survey of India, 15 A & B Kyd Street, Calcutta - 700 016, IN
2 Indian School of Mines, Dhanbad - 826 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 50, No 3 (1997), Pagination: 255-266Abstract
The dyke swarms intruding the Gondwana sequence in the east Bokara Coalfield, Bihar include lamprophyres and lamproites such as olivine lamproties, olivine-leucite lamproites and leucite lamproites. Basic intrusives and rare siderite rich carbonates (carbonatite ?) are also found. The olivine lamproites contain xenocrysts of olivine and rare xenoliths of harzburgite. Gold values upto 3.6 ppm on grab samples have been noted from the intrusive rocks in the area. These lampropbyric rocks are considered to have formed from a highly incompatible element enriched metasomatised mantle source probably of harzburgitic composition.Keywords
Petrology, Geochemistry, Lamprophyric Rocks, Gold, Bokaro Coalfield, Bihar.- Petrology and Geochemistry of Basanite Dykes and Gabbro from Northern Kutch, Western India: Implications on Source Rock Characteristics
Authors
1 Department of Geology, Presidency College, 86/1 ,College Street, Kolkata - 700 073, IN
2 Indian Institute of Technology, Roorkee - 247 667, IN
3 Indian Institute of Geomagnetism ,Magnetic Observatory, Alibag - 402 20 1, IN
4 Flat 201, C-Wing, ISM House, 818A Thakur Village, Kandivali(E), Mumbai- 400 101, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 5 (2007), Pagination: 771-779Abstract
Major and trace (including rare earth)element abundances, mineral compositions and Nd and Sr isotopic compositions have been determined for the mafic dykes (classified as basanite) and gabbro of the northern Island belt of Kutch rift basin. These are petrographically and geochemically distinct but have similar mantle normalized trace element patterns Measured87Sr/86Sr ratios in the mafic dykes vary from 0 70428 to 0 70593 &Nd(i) varies from 0 27 to - 6 5. The isotopic compositions are broadly similar to that of Mahabaleshwar flows of western Deccan volcanic province. The geochemical character suggests the influence of fractional crystallisation in the evolution of the basanite dykes. The parent magma was enriched in K, Ti, Na and P suggesting derivations from an enriched source during the early phase of lifting Palaeomagnetic data on the dykes show the presence of both normal polarity direction at Dm = 338°, Im=-47° and reverse polarity direction at Dm=14l° and Im=34° indicating multiple intrusion Virtual Geomagnetic Pole(VGP) for the basanite dykes differs from Deccan Super pole suggesting a magmatic event older than the main Deccan eruption.Keywords
Petrology, Geochemistry, Dykes, Gabbro, Kutch, Gujarat.- Indian Kimberlites and Related Rocks: Petrology and Geochemistry
Authors
1 Department of Geology, Presidency College, College Street, Kolkata - 700 073, IN
2 Geological Survey of India, Training Institute, Bandlaguda, Hyderabad - 500 068, IN
3 Geological Survey of India, NH5P, NIT, Faridabad 121 001, Haryana, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 67, No 3 (2006), Pagination: 328-355Abstract
Potassic, ultrapotassic, ultramafic rocks occur mostly as dykes and few diatremes in the southern and central Indian cratons. The ultramafic diatreme in Majhgawan in central India is the only diamond-Producing primary source at the present time. Several occurrences in southern India also contain diamond but are not being commercially exploited. Available isotopic age data on these rocks suggest a Proterozoic age (Table I), a feature that is distinctive compared to other ages on similar rocks barring the Premier pipe in southern Africa.
We present petrographic, mineralogical and geochemical data on carefully selected samples from several localities. Mineralogically there are differences in the content of olivine, Phlogopite, perovskite and spinel among the localities. In common with occurrences elsewhere, the olivines show a range from 83 to 93 mole percent. The macrocrystal olivines are more magnesian. Among the phlogopites, a two-Fold division on the basis of Mg number is discernible. Most of the ilmenites are distinctly less magnesian than the southern African kimberlites. Geochemically the samples show a wide variation in major element abundances. Despite geographical separation and petrographic differences, Zr and Hf maintain a perfect positive correlation. In common with similar rocks, all the samples studied show an enrichment of both compatible and incompatible elements. Compared to established and accepted kimberlites of southern Africa and lamproites of Western Australia, the Indian samples show general similarity but also divergences in geochemical parameters. This is believed to suggest a transitional nature of the Indian potassic, ultramafic rocks between kimberlites and lamproites Petrogenesis of the occurrences is discussed.
Keywords
Indian Kimberlites, Review, Petrology, Geochemistry, Geochronology.- Mantle-Derived Mafic-Ultramafic Xenoliths and the Nature of Indian Sub-Continental Lithosphere
Authors
1 Department of Geology, University of Pune, Pune - 411 007, IN
2 Department of Geology, Banaras Hindu University, Varanasi - 221 005, IN
3 Department of Geology, Presidency College, Kolkata - 700 073, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 73, No 5 (2009), Pagination: 657-679Abstract
Mantle derived xenoliths in India are known to occur in the Proterozoic ultrapotassic rocks like kimberlites from Dharwar and Bastar craton and Mesozoic alkali igneous rocks like lamrophyres, nephelinites and basanites. The xenoliths in kimberlites are represented by garnet harzburgites, lherzolites, wehrlite, olivine clinopyroxenites and kyaniteeclogite varieties. The PT conditions estimated for xenoliths from the Dharwar craton suggest that the lithosphere was at least 185 km thick during the Mid-Proterozoic period. The ultrabasic and eclogite xenoliths have been derived from depths of 100-180 km and 75-150 km respectively. The Kalyandurg and Brahmanpalle clusters have sampled the typical Archaean subcontinental lithospheric mantle (SCLM) with a low geotherm (35 mW/m2) and harzburgitic to lherzolitic rocks with median Xmgolivine > 0.93. The base of the depleted lithosphere at 185-195 km depth is marked by a 10-15 km layer of strongly metasomatised peridotites (Xmgolivine > ∼0.88). The Anampalle and Wajrakarur clusters 60 km to the NW show a distinctly different SCLM; it has a higher geotherm (37.5 to 40 mW/m2) and contains few subcalcic harzburgites, and has a median Xmgolivine = 0.925. In contrast, the kimberlites of the Uravakonda and WK-7 clusters sampled quite fertile (median Xmgolivine ∼0.915) SCLM with an elevated geotherm (>40 mW/m2).The lamrophyres, basanites and melanephelinites associated with the Deccan Volcanic Province entrain both ultramafic and mafic xenoliths. The ultramafic group is represented by (i) spinel lherzolites, harzburgites, and (ii) pyroxenites. Single pyroxene granulite and two pyroxene granulites constitutes the mafic group. Temperature estimates for the West Coast xenoliths indicate equilibration temperatures of 500-900°C while the pressure estimates vary between 6-11 kbar corresponding to depths of 20-35 km. This elevated geotherm implies that the region is characterized by abnormally high heat flow, which is also supported by the presence of linear array of hot springs along the West Coast. Spinel peridotite xenoliths entrained in the basanites and melanephelinites from the Kutch show low equilibrium temperatures (884-972°C). The estimated pressures obtained on the basis of the absence of both plagioclase and garnet in the xenoliths and by referring the temperatures to the West Coast geotherm is ∼15 kbar (40-45 km depth). The minimum heat flow of 60 to 70 mW/m2 has been computed for the Kutch xenolith (Bhujia hill), which is closely comparable to the oceanic geotherm. Xenolith studies from the West Coast and Kutch indicate that the SCLM beneath is strongly metasomatised although the style of metasomatism is different from that below the Dharwar Craton.
Keywords
Mantle Xenoliths, Kimberlites, Alkali Magmatism, Subcontinental Lithospheric Mantle, Deccan Volcanic Province, Dharwar Craton.References
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