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Debala Devi, L.
- Depositional Environment of Carbonate Rocks of Ukhrul Area, Manipnr Ophiolite Complex, NE India
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Himalayan Geology, Vol 34, No 1 (2013), Pagination: 76-83Abstract
The stable isotopes in conjuction with petrography and whole rock geochemistry of carbonates from the Ukhrul area of the Manipur Ophiolite Complex were examined to understand their depositional environment. These carbonates are characterized by the presence of biomicrite as dominant microfacies, high CafMg ratio (13.99 to 121.69), low phosphorous content (0.00 to 1.51), absence of oolites and benthic foraminifera. They show depleted values of 5UC%o (0.89 to 2.74) and 6"O%o (-8.50 to-l 0.5). The data obtained from the petrographical and geochemical investigations suggest that these carbonates were formed in a shallow marine environment (neritic to bathyl).Keywords
Carbonate Rocks, Neritic and Bathyl Environments, Ukhrul, Manipur Ophiolite Complex, NE India
- Pillow Basalts from the Manipur Ophiolitic Complex (MOC), Indo-Myanmar Range, Northeast India
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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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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
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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.- Geochemical Study of Peridotites from the Manipur Ophiolite Complex, Northeast India with Special Reference to their PGE Concentration
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1 Department of Geology, D.M. College of Science, Imphal - 795 001, IN
1 Department of Geology, D.M. College of Science, Imphal - 795 001, IN
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Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 77, No 3 (2011), Pagination: 273-279Abstract
The peridotites of the Manipur Ophiolite Complex (MOC) have been examined based on mineral chemistry, major elements and PGE contents. They represent high-magnesian cumulates with Mg# > 0.90 (Mg/Mg+Fe) in olivine and Cr# > 0.12 (Cr/Cr+Al) in spinel. High Mg* contents of the olivine show that these rocks are most likely derived from partial melting of the residual upper mantle. The peridotites contain higher concentration of Palladium Group PGE (PPGE) (Rh=4.4-6.6ppb; Pd=336-458ppb and Pt=14.6-36.4ppb) than the Iridium Group PGE (IPGE) (Os=2.4-5.8ppb; Ir=3.2-4.16ppb and Ru=5.2-7ppb). These are characterized by overall enrichment of PGE concentration (ΣPGE=365.8 - 516.6 ppb) and high ratio of (Pt+Pd)/(Os+Ir+Ru). This suggests that the rocks are formed by partial melting and crystal fractionation of olivine-rich (picritic) magma.Keywords
Manipur Ophiolite Complex, Eastern Indian Plate Margin, Peridotite, Fractional Crystallization, PGE, Picritic Magma, Manipur.- Geochemistry of Mid-Ocean Ridge Mafic intrusives from the Manipur Ophiolitic Complex, Indo-Myanmar Orogenic Belt, NE India
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Affiliations
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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