DIKE-HOSTED ORES OF THE BEAST DEPOSIT AND THE IMPORTANCE OF EOCENE MAGMATISM IN GOLD MINERALIZATION OF THE CARLIN TREND, NEVADA—A REPLY

摘要: We appreciate the comments of G.D. Langstaff and opportunity to elaborate on origin Carlin-type gold deposits. focuses two critical issues regarding these deposits, their age spatial association with igneous rocks. Although his comment mentions almost every known deposit, our reply deposits in major districts. Direct dating hydrothermal minerals indirect based crosscutting relations pre-, syn-, or postmineral rocks Nevada have demonstrated that all trends are Eocene (Emsbo et al., 1996; Leonardson Rahn, Phinisey Groff 1997; Hall 1997, 2000; Hofstra 1999; Cline, Johnston, Ressel 2000a, b; Tretbar 2000). many not dated, we emphasize no deposit has been be any other age. Preliminary 40Ar/39Ar white micas from mineralized dikes at Meikle Griffin Carlin trend gives ages (Ressel 2000b). Any discussion origin, especially association, must northern central (Fig. 1). Deposits there constitute ~60 percent total estimated contained Utah (Hofstra interpreted 700 km2 aeromagnetic anomaly 1) reflect an underlying "composite intrusion emplaced between about 40 …