The location of Lake Superior with respect to the currently active plate boundaries is shown in the map above. Some of the world’s largest metal sulfide deposits formed due to igneous activities around the Lake Superior region. Since Lake Superior is not located near any currently active plate boundary, what do you think might have caused the igneous activity that formed the sulfide mineral deposits near Lake Superior?
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An active divergent plate boundary used to exist in the location where Lake Superior is today. Igneous activity along that plate boundary created the sulfide mineral deposits we find there.
The sulfide deposits were formed next to an active plate boundary today (as shown on the map) and eroded to its present location in Lake Superior.
Ans- The sulfide deposits were formed next to an active plate boundary today (as shown on the map) and eroded to its present location in Lake Superior.
Lake superior type deposit was a precipitation type banded iron formation deposit which was deposited during the Paleo Proterozoic time. This deposit was formed at the Continental shelf area.
There is an other type of BIF deposit i.e. the Algoma type deposit which was formed because of the direct deposition from igneous activities or sulphide intrusions.
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