The Global Warming That Took Place At Permian Triassic Boundary

1038 WordsMar 9, 20155 Pages
Introduction One of the most devastating weather extremes happened 250 million years ago. A massive volcanic eruption (that occurred in an area now known as Siberia) caused increase in carbon dioxide and methane levels resulting in the extreme global warming. Today, the remains of this volcanic activity are called Siberian traps. The origin of Siberian traps is considered to be a mantle plume that burst through Earth’s crust releasing large volumes of basalt lava. Radiometric dating showed this volcanic event took place approximately from 251 to 250 million years ago (Reichow et al., 2009). Siberian traps erupted over several vents releasing around 2.5 million km3 of basalt lava that covered up to 60% of Siberian craton (Fedorenko et al., 1996). This paper will discuss firstly significance of the global warming that took place at Permian-Triassic boundary. Secondly, lines of evidence that support the occurrence of this weather extreme will be presented, i.e., increase in carbon dioxide levels and methane levels. Thirdly and lastly, drawbacks of the current research done for the evidence provided will be examined. Significance Importance of examining this weather extreme is that it is thought to be a possible causes of the biggest mass extinction that has ever occurred on Earth. ADD DATE At Permian-Triassic period 96% of all marine species and 70% of land vertebrates went extinct (CITE). Most affected were species occupying shallow water, such as trilobites, rugose and

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