anorthosite-bearing anorogenic complexes of the Air Province, Niger * D a n i e l D e m a i f f e a, C h r i s t i a...leucogabbroic rocks, calculated assuming ages for each intrusion based on whole rock isochrons for felsic rocks.... Although there is a spread in values, each intrusion has a distinct isotopic signature, Bous and the...considerably larger and vary from 0.7084 for Abontorok and Tague'i to 0.7138 for Bous; CNd(t ) varies...plagioclase, which must have accumulated prior to intrusion at moderately shallow depths. The inferred parental
