During metamorphism, the gas that was released by the end-permian siberian flood basalt that altered the earth's climate is: carbon dioxide.
Metamorphism of sedimentary rocks can be described as the process by which sedimentary rocks are changed into metamorphic rocks due to elements like pressure and heat, which combine to cause physical, chemical and mineralogical changes to the sedimentary rocks.
In the case of the end-permian siberian flood basalt, through a direct combination of outgassing and metamorphism, the amounts of massive carbon dioxide that is released is implicated as a cause of climate change.
Thus, we can therefore state that he gas that was released during metamorphism by the end-permian siberian flood basalt that altered the earth's climate is: carbon dioxide.
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