Paleo-Hydrothermal Predecessor to Perennial Spring Activity in Thick Permafrost in the Canadian High Arctic, and Its Relation to Deep Salt Structures: Expedition Fiord, Axel Heiberg Island, Nunavut

Figure 10

Microthermometric data for primary and secondary fluid inclusions in carbonates from the paleosprings (WGVA and Striae Hill sites). (a) Summary of all data ( vs. bulk salinity) for primary and secondary inclusions in carbonates from WGVA and Striae Hill sites. Note the lack of correlation between and salinity, and the continuum in bulk salinity from a high-salinity brine in the earliest inclusions to variable salinity fluid (brine to meteoric range) in secondary inclusions. (b-c) Box-whisker plots summarizing microthermometry data for primary and secondary inclusions organized by fluid inclusion assemblage. Numbers next to box-whisker markers indicate the number of inclusions in each measured assemblage. Single assemblages can show up to a ~150°C intra-assemblage range in homogenization by vapour bubble disappearance, attributed to post-entrapment modification (leakage, necking down).