TY - RPRT TI - 40Ar/39Ar dating of vein amphibole from the Bayan Obo iron-rare earth element-niobium deposit, Inner Mongolia, China; constraints on mineralization and deposition of the Bayan Obo Group AU - James E. Conrad AU - Edwin H. McKee PY - 1992 DO - 10.2113/gsecongeo.87.1.185 UR - https://pubs.usgs.gov/publication/70243233 ID - 70243233 ER -