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Bikramaditya Singh, R. K.
- Pillow Basalts from the Manipur Ophiolitic Complex (MOC), Indo-Myanmar Range, Northeast India
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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 - 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.
- Geochemistry and Petrogenesis of Granitoids of Lesser Himalayan Crystallines, Western Arunachal Himalaya
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1 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN
1 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 75, No 4 (2010), Pagination: 618-631Abstract
Low to medium grade crystalline rocks locally known as Bomdila Group extensively covers the Lesser Himalayan region in Western Arunachal Himalaya. This Group consists dominantly of mylonitic gneisses of granitic composition of Palaeoproterozoic age, named as Bomdila mylonitic gneiss (BMG) and a small body of hornblende bearing granite of Mesoproterozoic age known as Salari granite (SG). The BMG is affinity to peraluminous (A/CNK > 1.1) with high content of SiO2, K2O/Na2O ratio, normative corundum, high ratio of FeOt/MgO in biotite (3.21-5.11) that shows characteristics of S-type granite whereas SG has granodiorite composition with high Na2O, low K2O, presence of hornblende, normative diopside, low A/CNK ratio (<1.1) and low FeOt/MgO ratio in biotite (1.58-1.60) indicates metaluminous I-type granite affinity. The SG has more fractionated nature of REE [(Ce/Yb)N = 9.06-18.53] and minor negative Eu anomalies [EuN/Eu* = 0.69-0.94] as compared to BMG which has less fractionation of REE [(Ce/Yb)N = 5.95-9.16] and strong negative Eu anomalies [EuN/Eu* = 0.37-0.43]. Geochemical and petrological studies suggest that the SG and BMG are not genetically related; SG appears to have derived from igneous source whereas the BMG have been derived from sedimentary source, however these granitoids might have produced during the same thermal event.Keywords
Bomdila Mylonitic Gneiss, Salari Granite, Geochemistry, Mineral Chemistry, Arunachal Himalaya.- Geochemistry of Mid-Ocean Ridge Mafic intrusives from the Manipur Ophiolitic Complex, Indo-Myanmar Orogenic Belt, NE India
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Authors
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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