Earth, Atmosphere & Environment Sciences
Title : | Characterisation of deep crustal processes in the lower continental crust through the study of Mg-Al granulites from the Central Migmatite Zone of the Eastern Ghats Mobile Belt, India |
Area of research : | Earth, Atmosphere & Environment Sciences |
Principal Investigator : | Prof. Divya Prakash, Banaras Hindu University, Uttar Pradesh |
Timeline Start Year : | 2023 |
Timeline End Year : | 2026 |
Contact info : | dprakashbhu@yahoo.com |
Equipments : | Laptop |
Details
Executive Summary : | The proposed project aims in deciphering the tectono-metamorphic history of the three sectors of the Eastern Ghats Mobile Belt (EGMB) (a) Chilka Sector, (b) Junagarh-Kalahandi Sector and (c) Paderu G-Madugulu-Kothuru sector to explain the discrepancies in the evolutionary model of EGMB. The project proposes to undertake detailed petrological investigations in the above-mentioned sectors. The discrepancies in the evolutionary model of EGMB as regard to the crustal evolution remain an enigma. Integrated petological investigations from these sectors are first time proposed in present project. Furthermore, maximum Mg-Al granulite occurrences reported only from a few pockets of EGMB. There are good chances of new localities of Mg-Al granulites which may be a potential tool in suggesting the tectonic evolution and in order to obtain an integrated geodynamic picture of EGMB crustal evolution. Detailed studies will be carried out across these sectors to bring out P-T conditions of metamorphism and lithological discontinuity during different tectono-metamorphic episodes which may help to explain the discrepancies in the evolutionary model of EGMB. The PI has more than three decades of experience of working on Mg-Al granulites of several parts of EGMB, Southern Granulite Terrain and Eastern Dharwar Craton and contributed significantly in demonstrating the crustal evolution controversies of these granulite terrains. The EGMB contains several granulite facies rocks such as charnockites, enderbites, mafic granulites, khondalites, calc granulites, Mg-Al granulites and migmatite gneisses. More significant are high Mg-Al granulites that are potential tool for the derivation of P-T trajectory of metamorphism because they preserve signatures of metamorphic crystallization through arrested textures. Since P-T pseudosections have proved to be a popular and powerful means of predicting and explaining mineral paragenesis of metamorphic rocks, these reaction textures when combined with pseudosections will provide a far more complete description of the chemistry more effective and appropriate than petrogenetic grids. Such exercise will also yield distinct P-T segments for various evolutionary stages demarcating the style of crustal trajectory, which is regarded as a definite aid in deciphering the geodynamic processes. Lack of detailed work in proposed sectors has led to lot of speculations on its evolutionary model. Current concepts and interpretations and speculative tectonic models can be verified and better petrological constraints may be provided by detailed work in these regions. The research proposal is fully integrated among field, textural, petrological and geochronological aspects of granulites precursors. The outcome of the proposed project will serve as a window into lower continental crust and shed light on the crustal evolution of the high-grade metamorphic rocks exhumed from deep levels of the crust. |
Total Budget (INR): | 48,25,920 |
Organizations involved