Earth, Atmosphere & Environment Sciences
Title : | Understanding the magma dynamics in the generation of mafic-ultramafic complex of Gaya and Aurangabad area of Chotanagpur Granite Gneiss Complex, Eastern India: Implications for amalgamation and fragmentation of the Greater Indian Landmass |
Area of research : | Earth, Atmosphere & Environment Sciences |
Focus area : | Geology, Earth Sciences |
Principal Investigator : | Dr. Ashima Saikia, Department Of Geology, University Of Delhi |
Timeline Start Year : | 2023 |
Timeline End Year : | 2026 |
Contact info : | ashima.saikia@gmail.com |
Details
Executive Summary : | The study of mafic-ultramafic rocks provides windows into the composition of Earth's mantle and the nature of crust-mantle interactions. Such rocks preserve significant records of mantle evolution, magma generation and magma differentiation and can also host significant Ni-PGE-Cr deposits. The proposed project aims to conduct a detailed petrological and geochemical study of the mafic and ultramafic rock complexes in and around Gaya and Aurangabad district of Bihar in the Chotanagpur Granite Gneiss Complex(CGGC). Further, the PGE mineralization potential will be investigated in the studied rocks. Though there are very few unpublished reports of ultramafic-mafic rocks occurring in the northern part of CGGC, as isolated patches within the granite and granite gneisses, the petrogenetic aspects of these rocks and their relationship with the regional geological evolution of CGGC has not yet been worked out. It is well known that the positioning and understanding of the growth of the CGGC are crucial to track the evolution of the Greater Indian landmass by the amalgamation of the Southern Indian block and Norther Indian block through time. Hence, it is important to comprehensively understand all the components of this terrain. A detailed investigation and characterisation of such rocks are required to understand their role during major geological events such as collision and separation of continental blocks and/or mantle plume activity that ultimately led to the overall crustal growth of the CGGC Indian shield. The work in this project intends to generate petrographic, geochemical and geochronological data of the magmatic rocks found in the northwestern zone of the CGGC. Analysed data will be used to infer constraints on the parental magma, nature of the mantle source. Furthermore, a geodynamic model will be worked out to figure out the tectonic processes which may have contributed to the formation of the investigated rocks. In addition, the mafic-ultramafic intrusions will be probed for possible enrichment of PGE in them. Further, the data generated during this project work will be correlated with the already published data (especially in the context of position and characteristics of mafic-ultramafic rock association) from other sectors of CGGC to constrain the magmatic evolution the area. This study aims to provide information that will help to improve our understanding of different magmatic and tectonic events that shaped the crystalline basement of the CGGC. Results will robustly constrain the tectonic history of the Eastern Indian Shield and its position with respect to proposed Precambrian supercontinent cycle. |
Total Budget (INR): | 43,48,696 |
Organizations involved