Oldest water coming out of brine in Soudan mine?
This is an interesting possibility. Although the 2.7 year old Animake basis that contains the Soudan formation is not the oldest on Earth. It is not even the oldest in Minnesota by almost a billion years (Minnesota River valley gneisses are ~3.6 ga).
But the possibility that there is a concentration of the original briny water stuck under the mine makes for some interesting thought experiments.
Like what the fuck is Water Legacy talking about when they speak of aquifers in the nearby Duluth complex, if the water can get stuck down there for 2.7 billion years it is not an aquifer.
Ok, here is the story…