Zircon U–Pb (SHRIMP) Ages of the Jahazpur Granite and Mangalwar Gneiss from the Deoli-Jahazpur Sector, Rajasthan, NW India: A Preliminary Reappraisal of Stratigraphic Correlation and Implications to Crustal Growth

We present high precision geochronological data from the Jahazpur granite and the associated Mangalwar gneiss from Deoli-Jahazpur-Hindoli region of the Aravalli Craton, northwestern India. These data are useful to understand the stratigraphic correlation between the basement gneiss and the low-grade supracrustal rocks of the Hindoli-Jahazpur Group. U–Pb (SHRIMP-IIe) data from zircon suggest emplacement age of 2538 ± 5 Ma for the Jahazpur granite, whereas a similar age of 2520 ± 37 Ma is the timing of the high-grade metamorphism and anatexis of the Mangalwar gneiss. Combining these with whole rock geochemical data, we argue that the Neoarchean Jahazpur granite underwent crustal contamination and emplaced at the same time frame of the Berach granite. Concomitant metamorphism and granitic magmatism imply that overlying Hindoli-Jahazpur Group is younger than c. 2520 Ma. Thus, the Neoarchean Jahazpur granite and Mangalwar gneiss are constituents of the Banded Gneissic Complex which forms the basement of the Hindoli-Jahazpur supracrustal sequence.