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Vallinayagam, G.
- Zircons from the Granitic Rocks of the Malani Igneous Suite : Morphological and Chemical Studies
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Authors
Affiliations
1 Department of Geology, Panjab University, Chandigarh, IN
1 Department of Geology, Panjab University, Chandigarh, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 38, No 6 (1991), Pagination: 561-576Abstract
Zircons are hydrothennal or late-magmatic. The high UO2 contents of the Tosham zircons reflect the high UO2 of the host rocks. The Siwana granites, though high in Zr values, have very poor zircon yield. This is probably due to the pcralkalinity of the Si wana magma.Keywords
Malani Igneous Suite, Zircon, Siwana Granite, Geochemistry, Rajasthan.
- Volcanic Vent in Nakora Ring Complex of Malani Igneous Suite, Northwestern India
Abstract Views :197 |
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Authors
Affiliations
1 Department of Geology, Kurukshetra University, Kurukshetra - 136 119, IN
1 Department of Geology, Kurukshetra University, Kurukshetra - 136 119, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 5 (2007), Pagination: 881-883Abstract
No Abstract.Full Text
- High Heat Production Granites from the Piplun and Kundal Areas, Malani Igneous Suite, Western Rajasthan
Abstract Views :181 |
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Authors
Affiliations
1 wadia Institute of Himalayan Geology, Northeast Unit, Itanagar - 791 113, IN
2 Department of Earth Sciences, Kurukshetra University, Kurukshetra - 136 119, IN
1 wadia Institute of Himalayan Geology, Northeast Unit, Itanagar - 791 113, IN
2 Department of Earth Sciences, Kurukshetra University, Kurukshetra - 136 119, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 4 (2006), Pagination: 585-588Abstract
The Piplun and Kundal granites of the Malani Igneous Suite (MIS) are peralkaline to mildly peraluminous A-Type and 'high heat production' (HHP) type. They are enriched in Nb, Y, Ta, Zr, Zn, Pb, Hf, Ta, U, Th, REE and heat productive units. The Kundal granites have higher HHP values (9 19-1 3 72 μWm3) than the Piplun granites (4 92- 8 76 μWm3). The average HHP value of the Kundal granites (11 98 μWm3) is much similar to that of the Jhunjhunu granites of MIS (12 06 μWm3) and A-type Nigenan younger granites (1 1 16 μWm3). The average total heat generation value (17 10 HGU) of these granites is significantly higher than that of the continental crust (3 8 HGU) and of 'cold crust' (<7 HGU), which demonstrates that MIS belongs to the 'hot crust'.Keywords
HHP-Type Granites, Malani Igneous Suite, Pliplun And Kundal, Rajasthan.- Bombolai Continental Pillow Lavas (Neoproterozoic) from Trans-Aravalli Region, Pali District, Rajasthan and their Tectonic Significance
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Authors
Kamal Kant Sharma
1,
M. Shamim Khan
2,
M. Raza
2,
M. Safdar-E-Azam
2,
G. Vallinayagam
3,
M. Shamim Khan
2,
M. Raza
2,
M. Safdar-E-Azam
2
Affiliations
1 Government College, Sirohi- 307 00 1 (Rajasthan), IN
2 Dept. of Geology, Aligarh Muslim University, Aligarh - 202 003, IN
3 Department of Earth Sciences, Kurukshetra University, Kurukshetra - 136 1 19, IN
1 Government College, Sirohi- 307 00 1 (Rajasthan), IN
2 Dept. of Geology, Aligarh Muslim University, Aligarh - 202 003, IN
3 Department of Earth Sciences, Kurukshetra University, Kurukshetra - 136 1 19, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 66, No 3 (2005), Pagination: 376-379Abstract
No Abstract.Full Text
- Orbicular Rhyolite of Dhiran Area, Malani Igneous Suite, Barmer District, Western Rajasthan
Abstract Views :173 |
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Authors
Affiliations
1 Department of Geology, Kurukshetra University, Kurukshetra-136119, IN
2 Department of Geology, Kurukshetra University, Kurukshetra -136119, IN
1 Department of Geology, Kurukshetra University, Kurukshetra-136119, IN
2 Department of Geology, Kurukshetra University, Kurukshetra -136119, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 1 (2008), Pagination: 67-72Abstract
Occurrences of large multi-shell orbicular structures m Malani Igneous Suite, Western Rajasthan has been reported for the first time The orbicules occur in an Anorogenic, A-type rhyolite The majority of the orbs comprise of a senes of distinct shells (layers) viz dark and light colour shells surrounding a core The shells consist of orthoclase, sanidme, quartz (light colour shell) and orthoclase, iron oxide (magnetite& ilmenite), riebeckite and arfvedsonite (dark colour shell) The core and groundmass of the orbicules have identical composition.Keywords
Orbicular Structure, A-type Rhyolite, Malani Igneous Suite, Dhiran Barmer, Rajasthan.- Geochemistry and Petrogenesis of Granite in Kundal Area, Malani Igneous Suite, Western Rajasthan
Abstract Views :169 |
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Authors
Affiliations
1 Department of Earth Sciences, Kurukshetra University, Kurukshetra - 136 119, Haryana, IN
1 Department of Earth Sciences, Kurukshetra University, Kurukshetra - 136 119, Haryana, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 60, No 2 (2002), Pagination: 183-192Abstract
Kundal area form a part of the Malani Igneous Suite and consists of subvolcanic and volcanic rocks. Three major lithological units viz. extrusives, intrusives and dykes are exposed in this area. Kundal granites are low in Mg number, MgO, Fe203(t), CaO, Sr and high in SiO2, Na2O, K2O, Y and show both the LREE and HREE enriched patterns with large negative Eu anomalies suggestive of crustal origin. They are probably derived by low degrees of partial melting of pre-existing rocks of intermediate to felsic composition. The granites plot within the plate field of the discreminant diagrams, supporting an anorogenic tectonic setting for their emplacement.Keywords
Granites, Geochemistry, Partial Melting, Malani Igneous Suite, Kundal, Rajasthan.- Radioactive Element Distribution and Rare-Metal Mineralization in Anorogenic Acid Volcano-Plutonic Rocks of the Neoproterozoic Malani Felsic Province, Western Peninsular India
Abstract Views :298 |
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Authors
Affiliations
1 Wadia Institute of Himalayan Geology, Northeast Unit, Itanagar - 791 113, IN
2 Department of Geology, Kurukshetra University, Kurukshetra - 136 119, IN
1 Wadia Institute of Himalayan Geology, Northeast Unit, Itanagar - 791 113, IN
2 Department of Geology, Kurukshetra University, Kurukshetra - 136 119, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 73, No 6 (2009), Pagination: 837-853Abstract
The Anorogenic Malani Felsic Province (MFP) of western Peninsular India consists of peralkaline, metaluminous to mildly peraluminous A-type granites-acid volcanics with minor basic volcanics and dykes. The suite is bimodal in nature that characterized by volcano-plutonic ring structures and radial dykes. The granitoids of Siwana and Kundal areas of MFP are traversed by numerous quartz veins with fluoride, iron encrustations, druses and knots of pegmatite phases. Petrographically, they show cloudy, patchy perthitic textures; spherulite form of alkali amphibole and alkali pyroxenes; alteration of K-Na-feldspar to kaolin/sericite, magnetite to haematite; growth of granophyres/perthite/rapakivi like textures. They are enriched in SiO2, Na2O+K2O, Fe/Mg, Rb, Zr, Y, Ga, REE (except Eu) and depleted in MgO, CaO, Mg#, P, Ti, Sr, Ni, Cr, Co and V. Uniform REE patterns, parallel to sub-parallel, LREE enriched over HREE and prominent negative Eu-anomalies are the characteristics of these granitoids. Geochemical parameters satisfy the A-type nature of granitoids and crustal origin of these rocks. These granitoids are high heat producing granitoids because of their high content of radioactive elements (U, Th, K), and can be classified as granite (Type I) (avg. 7.18 μWm-3), rhyolite and trachyte (Type II) (avg. 4.47 μWm-3) and acid dyke (Type III) (avg. 14.53 μWm-3). The average total heat generation unit (HGU) of Type I (17.10 HGU), Type II (10.64 HGU) and Type III (35.31 HGU) are much higher than the average value of continental crust (3.8 HGU), which imply a possible linear relationship among the surface heat generations in the MFP. Field, petrography and whole rock geochemical characteristics suggest potentiality for rare metals and rare earth elements mineralization in the studied granitoids of the MFP.Keywords
Granitoid, Radioactivity, Mineralization, A-Type Acid Rocks, Malani Felsic Province, Western Peninsular India.References
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1 Department of Earth Sciences, Kurukshetra University, Kurukshetra -136 119, IN
1 Department of Earth Sciences, Kurukshetra University, Kurukshetra -136 119, IN