New constraints on regional brecciation in the Wernecke Mountains, Canada, from He, Ne, Ar, Kr, Xe, Cl, Br and I in fluid inclusions
MA Kendrick, M Honda, D Gillen, T Baker, D Phillips
CHEMICAL GEOLOGY | ELSEVIER | Published : 2008
Regionally-distributed brecciation in the Proterozoic Wernecke Mountains of Canada is associated with hydrothermal alteration, that is similar to that seen in the Fe-oxide-Cu-Au class of ore deposit and characterized by variably saline fluid inclusions. Two phase liquid-vapour (LV) fluid inclusions ( 100 ppb and 40Ar/36Ar of < 1000-2000. Similar fluid inclusions in sulphide have near atmospheric 20Ne/22Ne and 21Ne/22Ne values of ~ 9.8 and 0.029, respectively; and are enriched in 4He* with 4He*/40Ar* and 4He*/21Ne* values of greater than the crustal production ratios. All these characteristics are typical of low temperature (< 250 °C) sedimentary formation waters. Halite saturated liquid-vapo..View full abstract
This work was funded by the predictive mineral discovery Cooperative Reasearch Centre (pmd*CRC) as a collaboration between the fluids (F3) and fluid history (H6) projects and is published with permission. Julie Hunt is thanked for guiding DG during fieldwork and for providing samples for fluid inclusion work. Stan Szczepanski and Igor Yatsevich are thanked for technical assistance in the noble gas laboratories in Melbourne and Canberra, respectively. Alan Greig is thanked for undertaking the trace element analysis of sulphide samples and Geordie Mark for his insights into the Wernecke district.