Rubidium–Strontium Dating, Hydrothermal Events
Dating hydrothermal events related to the formation of ore deposits by the Rb–Sr dating method
Dating of a hydrothermal event related to ore formation was conducted initially by dating the granite that was regarded as the heat source for the hydrothermal activity and assuming that ore deposition occurred contemporaneously with emplacement of the granite. Indirect dating of alteration minerals such as sericite using K–Ar, Ar–Ar, and Rb–Sr methods was also attempted. Results from these studies, however, have been problematic because of (1) complex associations between ore and alteration minerals and (2) possible multiple hydrothermal events, which can reset chronological information. Gangue minerals can be used as more direct targets of dating. Shepherd and Darbyshire (1981) obtained the Rb–Sr age of 392 ± 5 Myr from fluid inclusions in quartz from the Carrock Fell tungsten vein deposits, northern England. However, the cause of the large variable Rb–Sr...
KeywordsFluid Inclusion Gold Deposit Sulfide Mineral Hydrothermal Event Disseminate Gold Deposit
- Christensen, J. N., Halliday, A. N., Vearncombe, J. R., and Kesler, S. E., 1995b. Testing models of large-scale crustal fluid flow using direct dating of sulfides: Rb–Sr evidence for early dewatering and formation of Mississippi Valley-type deposits, Canning Basin, Australia. Economic Geology, 90, 877–884.CrossRefGoogle Scholar