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Krishnakanta Singh, A.
- Pillow Basalts from the Manipur Ophiolitic Complex (MOC), Indo-Myanmar Range, Northeast India
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Affiliations
1 Wadia Institute of Himalayan Geology, Northeast Unit, Itanagar - 791113, IN
2 Department of Geology, D M College of Science, Imphal - 795 001, IN
3 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN
1 Wadia Institute of Himalayan Geology, Northeast Unit, Itanagar - 791113, IN
2 Department of Geology, D M College of Science, Imphal - 795 001, IN
3 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 2 (2008), Pagination: 168-174Abstract
Pillow basalts have been reported from the Manipur Ophiolitic Complex (MOC) of the Indo-Myanmar Range. The pillows are closely packed together or individualistic and they are varying from 50 cm to 0.5m in diameter and vary from undeformed spheroid to flattened ellipsoids. They are ranging from silica undersaturated nephenine in norms) to silica saturated (hypersthene in norms) with respect to silica and characterized by enrichment of Large Ion Lithophile Elements (LILE) and depleted of TiO2, P2O5, Nb, Nb/Y values with high concentration of Al2O3, Cr, Ni and affinity with sub-alkaline and tholentic basalt in composition. The sub-aqueous natures of volcanism are indicated by the presence of pillow structures. Petrological and geochemical studies indicate that pillow basalts of Manipur Ophiolitic Complex are derived from a common source at higher degree of partial melting and possibly emplaced in a plate margin environment, which could be in a back arc basin of an oceanic environment that overlap the N-type MORB and IAB.Keywords
Pillow Basalt, Geochemistry, Manipur Ophiolitic Complex, Indo-Myanmar Range.
- Platinum Group of Elements (PGE) and Gold in the Ultramafic Rocks of Manipur Ophiolitic Complex, Northeast India: A Preliminary Report
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Authors
Affiliations
1 Wadia Institute of Himalayan Geology, Northeast Unit, Itanagar-791113, IN
2 Department of Geology, D.M. College of Science, Imphal-795001, IN
3 Departrnent of Geology, D.M. College of Science, Imphal-795001, IN
1 Wadia Institute of Himalayan Geology, Northeast Unit, Itanagar-791113, IN
2 Department of Geology, D.M. College of Science, Imphal-795001, IN
3 Departrnent of Geology, D.M. College of Science, Imphal-795001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 5 (2008), Pagination: 739-743Abstract
Platinum Group Elements (PGE) (Os, Ir, Ru, Rh, Pd, Pt) with Au and Ag content in ultramafic rocks (harzburgite, Iherzolite, wehrlite, dunite and tectonite) from the northern part (Ukhrul area) of the Manipur Ophiolite Complex (MOC), Indo-Myanmar range has been discussed briefly. The ultramafic rocks shows higher concentration of Palladium-group PGE (PPGE) (Rh = 4.4-6.6 ppb; Pd = 336-458 ppb; Pt = 34.6-36.4 ppb; Au = 38.8-116.8 ppb) and Ag (94-145 ppb) than the Iridium-Group PGE (IPGE) (0s = 2.4-5p.8pb; Ir = 3.2-4.8 ppb; Ru = 5.2-7 ppb). They are characterized by overall enrichment of PGE concentration (ΣPGE = 393.6-518.2 ppb) and high ratio of (Pt+Pd)/(Os+Ir+Ru) (24.18-35.23 ppb). The constancy of the ratios Ir/Os, Ru/Os, Ru/Ir suggests that these elements were in thermodynamic equilibrium during the crystallization. Cu/Pd ratios (1183-1473 ppb) in these rocks are lower than those in primitive mantles, probably suggests that the rocks contain cumulus sulphides. Preliminary studies indicate high concentration of PGE in the ultramafic rocks of MOC and further detail study is warranted to assess the economic feasibility of Platinum Group Elements and Gold.Keywords
Platinum Group of Element, Ultramafics, Manipur Ophiolite Complex, Indo-Myanmar Range.- High Heat Production Granites from the Piplun and Kundal Areas, Malani Igneous Suite, Western Rajasthan
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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.- Geochemistry and Petrogenesis of Granite in Kundal Area, Malani Igneous Suite, Western Rajasthan
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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
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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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- Geochemical Constraints on the Petrogenesis and Tectonic Environment of Gabbroic Intrusives in the Siang Window of Eastern Himalaya, Northeast India
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1 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN
1 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN
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Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 6 (2012), Pagination: 576-588Abstract
Carbonate and calcareous-quartzite of Miri-Buxa Group in the Siang Window of Eastern Himalaya intruded by mafic rocks of gabbroic affinity. These intrusive rocks are low-Ti tholeiites (Ti/Y = 379-478; Nb/La = 0.99-1.88) and characterized by enriched LILE-LREE, depleted in HFSE with minor REE fractionation [(La/Yb)N = 2.72-3.35)]. Geochemical behaviour of the incompatible trace elements with the rare earth elements abundances indicates their cogenetic nature and their emplacement in a continental rift tectonic environment. The liquidus olivine temperature of these mafic rocks ranges from 1262°C to 1380°C showing a gentle decrease of [Mg] with a steep increase of [Fe]. These charters thus imply that the rocks are either related to the extent of common source or fractionational crystallization of plagioclase and clinopyroxene from a single batch parental magma. Petrogenetic modeling of [Mg]-[Fe] and REE indicates that these mafic intrusives probably derived from a mantle source similar to komatiitic composition at moderate to high degree (8%-20%) of partial melting.Keywords
Mafic Intrusives, Petrology, Geochemistry, Siang Window, Eastern Himalaya.References
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- Geochemistry of Mid-Ocean Ridge Mafic intrusives from the Manipur Ophiolitic Complex, Indo-Myanmar Orogenic Belt, NE India
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1 Wadia Institute of Himalayan Geology, GMS Road, Dehradun - 248 001, IN
2 Department of Geology, D.M. College of Science, Imphal - 795 001, IN
1 Wadia Institute of Himalayan Geology, GMS Road, Dehradun - 248 001, IN
2 Department of Geology, D.M. College of Science, Imphal - 795 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 2 (2012), Pagination: 231-240Abstract
Mafic intrusives emplaced within the melange zone of the Manipur Ophiolitic Complex are subalkaline-tholeiitic affinity with Fe-enrichment. Based on the field occurrences, textures-mineralogy and whole-rock compositions, these mafic intrusives can be identified as type-I (gabbro intrusives) and type-II (basalt-dolerite dykes). The type-I resembling enriched-type mid-ocean ridge basalt (E-MORB) shows moderate LREE enrichment (LaN/SmN = 2.5-2.6), slightly enriched MORB normalized HFSE patterns possibly represent melts derived from enriched MORB sub-oceanic mantle sources by small degree of partial melting. The other type-II has normal-type mid-ocean ridge basalt (N-MORB) geochemical features, as it exhibits nearly flat to depleted LREE (LaN/SmN = 1.0-0.6), flat MORB normalized HFSE patterns with slight LREE/HREE depletion (CeN/YbN = 1.37-0.46). It might have been derived from depleted MORB type sub-oceanic mantle source. The MORB signature displayed by these mafic intrusives indicates that they are dismembered fragments of oceanic crust generated at mid-ocean spreading ridge system and support the hypothesis that the Manipur ophiolites was initially formed in the divergent plate margin.Keywords
Mafic Intrusives, MORB, Geochemistry, Manipur Ophiolite Complex, North East India.References
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