Pb isotope mapping of differentially uplifted Archean basement: a case study from the Grenville Province, Ontario

Uranium mobility during regional metamorphism typically causes the continental crust to become stratified in the U/Pb ratio, and hence, over time, Pb isotope ratio. This means that Pb isotope analysis of old gneiss terranes might be used as a means of estimating the original burial depth of the crust and its subsequent uplift history. The approach would be useful if other measures of burial depth, such as mineral chemistry, have been erased by …