Geochemistry of chromian spinels from the Indo-Myanmar ophiolite belt of Northeastern India

    Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

    Abstract

    Chromite is commonly used for deciphering the petrogenesis and geodynamic setting of ultramafic rocks. Chromespinels from the Indo-Myanmar ophiolite belt occurring in the form of podiform chromitites associated with the mantle sequence and associated volcanic rocks are studied to characterise their geochemical composition. We have measured major and trace element concentrations of the chrome-spinels. Cr/(Cr+Al) (Cr#) and Mg/(Mg+Fe²⁺) (Mg#) range from 66 to 70 and 66 to 69 respectively in the chromitite and 47 to 56 and 67 to 70 in volcanic spinel. The computed crystallization conditions show that the studied samples crystallized in an upper mantle environment. Using the chrome spinel compositions, parental magma for the chromitite rock is calculated as boninite, and a MORB for the volcanic sample. Minor and trace element (Ga, Ni, Zn, Co, Mn, V, Sc) concentrations in the analysed spinels are comparable to other podiform chromitites hosted in the mantle section of the ophiolite complexes. Chrome-spinel compositions of the two rocks are used to recognize the probable crystallization condition and nature of the parental magma.
    Original languageEnglish
    Title of host publicationProceedings of the workshop on magmatic ore deposits
    EditorsP. Krishnamurthy, K. T. Vidyadharan, R. H. Sawkar
    Place of PublicationBengaluru, India
    PublisherGeological Society of India
    Pages138-145
    Number of pages8
    ISBN (Print)9789380998015
    Publication statusPublished - 2014
    EventInternational Workshop on Recent Developments in the Chromite-Platinum Group Elements and Ni-Cu-Sulfide, Cr, Ti and V Ore Fields - Bengaluru, India
    Duration: 7 Dec 20128 Dec 2012

    Workshop

    WorkshopInternational Workshop on Recent Developments in the Chromite-Platinum Group Elements and Ni-Cu-Sulfide, Cr, Ti and V Ore Fields
    CityBengaluru, India
    Period7/12/128/12/12

    Keywords

    • Chromite
    • Ophiolite
    • Geochemistry
    • Ultramafic
    • Trace element

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