Radiometric ages of Precambrian rocks from central New Mexico

Radiometric ages for Precambrian rocks from central New Mexico have been reported by several authors (Brookins, 1974; Brookins and Majumdar, 1982; Brookins and others, 1978; White, 1978; Mukho-padhyay and others, 1975). The early U-Pb and Th-Pb dates by several investigators are summarized in Brookins (1974) and will not be repeated here. The other references deal primarily with Rb-Sr and K-Ar dates, and these are discussed in this paper. It should be pointed out, however, that many of these rocks are under re-investigation, and the dates and interpretations offered here are subject to revision (see Bowring and Condie, 1982).