Table 9. Summary new whole rock K in The Tumbarumba Basaltic Gem Field, New South Wales: In Relation to Sapphire-Ruby Deposits of Eastern Australia

Table 9. Summary new whole rock K-Ar dating, Tumbarumba-Cabramurra basalts. sample numberStatusRef.%K#40 Ar*(×10 –10 moles/g)40 Ar*/ 40 Artotalage±1DR14641A11.510.6243308.89423.7±0.2DR13822A20.110.848250.5985397.4±6.7 DR14641 Basanite, Jimmies Road, Granite Mountain (35°43.5'S 148°12.3'E) DR13822 Olivine micro-dolerite, Ruby Creek (35°49.4' S 148°11.5' E) Status A: potassium-bearing phases are fresh. Ref. 1—AMDEL laboratories, A. Webb analyst. Ref. 2—CSIRO Division of Petroleum Research, H. Zwingmann analyst. # mean K value used in age calculations. * denotes radiogenic 40 Ar. Age in Ma with error limits given for the analytical certainly at one standard deviation. Constants: 40 K = 0.01167 atom%; = 4.962×10 –10 y –1; = 0.581×10 –10 y –1