Fluid-inclusion and trace-element analyses of some barite-fluorite deposits in south-central New Mexico
Robert M. North and Mark A. Tuff
Fluid inclusions in fluorite collected from barite–fluorite (± galena) deposits in south-central New Mexico show they formed from fluids of similar temperatures and variable salinities. Deposits spatially associated with igneous rocks show salinities of less than 1.5 equivalent wt% NaCI, while those not obviously associated with igneous activity range from almost fresh water (0.1%) to 8%. Homogenization temperatures on all types ranged from 120 to 218°C, with most measurements falling between 140 and 180°C.
Trace-element analysis of barite showed considerable variation in samples from the same localities and no pattern was detected. The Y–Sr ratio in fluorite appears to separate igneous-associated deposits (e.g. Chise district) from sedimentary–hydrothermal deposits (e.g. Hansonburg district). The ratio is less than 1.5 in igneousassociated deposits and greater than 3 in known sedimentary–hydrothermal deposits.
- North, Robert M.; Tuff, Mark A., 1986, Fluid-inclusion and trace-element analyses of some barite-fluorite deposits in south-central New Mexico, in: Truth or Consequences region, Clemons, R. E.; King, W. E.; Mack, G. H., New Mexico Geological Society, Guidebook, 37th Field Conference, pp. 301-306.