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"Based on the Hg-isotope variations we were able to link an initial pulse in Hg enrichment at the Triassic-Jurassic boundary to the emission of mercury from flood basalt volcanism," Wang Zheng explains.

It’s predominantly flood basalt lavas erupted onto old granitic rock.

Thus these normally quiet flood basalt lavas carried and released a world of trouble into the end-Permian atmosphere.

Scientists recently discovered that an area in northern Canada and Greenland comprised of flood basalt contains traces of ancient Earth's primitive mantle.

Geological history has periodically featured giant lava eruptions that coat large swaths of land or ocean floor with basaltic lava, which hardens into rock formations called flood basalt.