After reading some more on the subject, this has been that way for many decades, possibly longer but the history is spotty further back. The CSIRO thinks it is possibly due to the nearness of a coal seam to the rifts and/or drought.

The recent fracking has drawn attention to it, with many locals claiming it has gotten worse since the fracking. Scientists are still researching it further to see if this is true.

I don't support fracking, but some of these reports usually are about things that were pre-existing due to the natural layout of the region. However, there are some cases where it is definitely a cause of the companies fracking in the area.

For instance, a recent study proved that drinking wells in Texas and Pennsylvania were affected by the fracking company not following the correct procedures. This led to the wells being contaminated with gas. They found that there were clear cases of substandard work that led to cracked steel and concrete in the casing of the drill sites. They said in the study that if the companies had followed the correct procedures, the contamination could have been easily prevented.

More on the wells - http://www.newsweek.com/fracking-wells-tainting-drinking-water-texas-and-pennsylvania-study-finds-270735

They probably should use the same method to check the origin of the noble gases in that river.

Tags for this video have been changed from 'replacement, attraction, noble, gases, explosive, action, zinc, hydrogen, carbon, oxygen' to 'replacement, attraction, noble, gases, explosive, reaction, hydrogen, carbon, oxygen' - edited by MarineGunrock