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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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Journal of the Geological Society of India

Abstract

Mafic intrusives emplaced within the mélange zone of the Manipur Ophiolitic Complex are subalkalinetholeiitic 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.

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Authors and Affiliations

  1. Wadia Institute of Himalayan Geology, GMS Road, Dehradun, 248 001, India

    A. Krishnakanta Singh & R. K. Bikramaditya Singh

  2. Department of Geology, D.M. College of Science, Imphal, 795 001, India

    N. Ibotombi Singh & L. Debala Devi

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  1. A. Krishnakanta Singh
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  3. L. Debala Devi
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Krishnakanta Singh, A., Ibotombi Singh, N., Debala Devi, L. et al. Geochemistry of mid-ocean ridge mafic intrusives from the Manipur Ophiolitic Complex, Indo-Myanmar Orogenic Belt, NE India. J Geol Soc India 80, 231–240 (2012). https://doi.org/10.1007/s12594-012-0133-9

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