Abstract
The Tirodi basement gneisses of Betul region of the Central Indian Tectonic Zone (CITZ) has been dissected by numerous mafic dykes, Padhar mafic–ultramafic complex (PMUM: Pyroxenite and gabbro) and pillow lavas of Betul supra-crustal belt. Mafic dykes, PMUM and pillow lavas are predominantly sub-alkaline, of tholeiitic affinity, ranging in composition from basalt, basaltic-andesite to andesite. All the rocks are enriched in incompatible trace element particularly light rare earth elements (LREE), large ion lithophile elements (LILE and K) and depleted in high field strength elements (HFSE: Nb, P, Ti). Chondrite normalised rare earth element (REE) and Primitive Mantle normalised spider diagram patterns for Padhar pyroxinite, gabbro, Betul dykes and pillow lavas indicate that they are derived from enriched mantle sources. The variation in trace elements abundances and fractionated LREE pattern of PMUM indicate that all the samples of Padhar mafic-ultramafic complex were generated from similar sources by varying degrees of partial melting. REE pattern of Betul dykes and pillow lavas show negative europium anomaly that suggest that fractionation of plagioclases may have played a vital role in their genesis. In the spider diagram all the rocks show negative Nb, P and Ti anomalies probably indicating crustal involvement in their genesis which is further confirmed in the trace element ratio–ratio plot Ce/Yb vs. Zr/Y. The depleted mantle model ages for the basic volcanics ranges between 1,951 and 2,320 Ma and that for one sample of pyroxenite from the PMUM is 2,770 Ma. The εNd (t=2,000 Ma) for the basic volcanics vary from +2.98 to –0.68 and that for one sample of pyroxinite is –0.86. These values indicate derivation of these magmatic rocks from nearly chondratic sources.
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Acknowledgment
We thank DST, New Delhi for the grant of funds under ILTP (TA and TK) and SERC projects to TA. We also thank the University of Delhi for all the facilities and partial funding under the Minor Project given to TA. We thank colleagues of WIHG geochemistry laboratory for the analytical support. Nishchal, Kabita, Meraj, Naushad, Kumar Batuk and Deepak Joshi are especially thanked for the help during the different field works. T.C. Devaraju is thanked for the constructive comments. Rajesh Srivastava is thanked for his editorial comments and for inviting us to contribute this paper to this special volume.
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Mishra, M., Devi, S., Kaulina, T., Dass, K., Kumar, S., Ahmad, T. (2011). Petrogenesis and Tectonic Setting of the Proterozoic Mafic Magmatic Rocks of the Central Indian Tectonic Zone, Betul Area: Geochemical Constraints. In: Dyke Swarms:Keys for Geodynamic Interpretation. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-12496-9_11
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