TY - RPRT TI - Rift-wide correlation of 1.1 Ga Midcontinent rift system basalts: Implications for multiple mantle sources during rift development AU - S. W. Nicholson AU - S.B. Shirey AU - K. J. Schulz AU - J.C. Green PY - 1997 DO - 10.1139/e17-041 UR - https://pubs.usgs.gov/publication/70019906 ID - 70019906 ER -