Journal
JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA
Volume 80, Issue 5, Pages 628-640Publisher
SPRINGER INDIA
DOI: 10.1007/s12594-012-0189-6
Keywords
Mafic-ultramafic intrusives; Subduction; Metasomatism; Mantle wedge; Padhar composite complex
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Metasomatism above subduction zone is an important process capable of producing a heterogeneous mantle wedge with locally varying characters. This, in turn, leads to variation in character of the mafic and intermediate rocks produced through partial melting of lithospheric mantle. The Padhar mafic-ultramafic complex is situated in western part of the Betul belt, Central India, shows enrichment in Rb, Ba, Th and Pb and depletion in Nb, Hf and Zr. Major and trace element data along with REE, confirms the presence of a metasomatized mantle above a Mesoproterozoic subduction zone. Differential petrological evolution, corresponding to the different magma batches, as reflected in almost all of the binary element / oxide variation diagrams, testifies small scale metasomatic heterogeneity in the underlying suprasubduction zone mantle wedge.
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