Fission track dating and uranium mineralization in pegmatites of Bhilwara area, Rajasthan State (India)

Abstract

Uranium estimation studies on muscovites occurring as pegmatites in the Bhilwara area, Rajasthan State (India) give an evidence of second-phase intrusions of uranium in the mica matrix. The uranium content of mica varies from 10⁻¹⁰ atom/atom to 10⁻⁵ atom/atom. The mean fission track age for this region was found to be 1069±51 m. y. The pegmatites are of Precambrian origin but the uranium inclusions belong to a much later stage in the geothermal history of the samples.