The mass extinction is abrupt climate change, the desert expanded, volcanic eruptions and a series of reasons. Meteorite impact Tours Scientists believe the meteorite or asteroid colliding with Earth led to the end-Permian mass extinction. If this impact to a certain extent, it will have an devastating in the global shock waves, caused by climate change and biological death. Recently collected some evidence raises the importance of this view. However, most biological scientists believe that this extinction is caused by natural variations in the Earth's. Climate change Some scientists believe that climate change is the main reason for the formation of this disaster. Because the formation of Permian rocks show that the climate was cooling in some areas, the formation of the polar ice caps on Earth. These huge ice sheets of white sunlight back into space launch, will further reduce global warming, land and sea creatures so difficult to adapt. If we add the plane down and volcanic eruptions Shanghai, which will become a disaster. Changes in atmospheric composition Some biologists believe that an active lifestyle more active animals such as mammals like the single bow animals need more oxygen than other animals, they may be due to changes in atmospheric composition extinction. Because the temperature of the lower Permian sea level will lead to the decline. The vast sea-bed area will be left exposed coal, releasing carbon dioxide into the atmosphere, the oxygen content in the atmosphere will be reduced. Volcanic activity Volcanic eruptions and volcanic gases back to a lot of dust emitted into the atmosphere. Volcanic mountain group will not only suffocate animals may also be obscured the sun, global temperatures decreased. Therefore, the volcanic activity may also be the end-Permian extinction event is one of the reasons. Siberia, once discovered that the violent eruption of the volcano ejected material. The ravages of the desert Permian collision of continental blocks to form a large contiguous Pangaea. Rain and fog from the sea can no longer probe into the interior. So some areas of the Permian is getting dry and hot, leading to increasingly wide range of desert, arid environment of the animals can not adapt became extinct.
Meteorite impact Some scientists believe that meteorites or asteroids colliding with Earth led to the end-Permian mass extinction. If this impact to a certain extent, it will have an devastating in the global shock waves, caused by climate change and biological death. Recently collected some evidence raises the importance of this view. However, most biological scientists believe that this extinction is caused by natural variations in the Earth's. Climate change Some scientists believe that climate change is the main reason for causing this disaster. Because the formation of Permian rocks show that the climate was cooling in some areas, the formation of the polar ice caps on Earth. These huge white ice to reflect sunlight back into space, will further reduce the global temperature, so that land and sea creatures is difficult to adapt. If we add the plane down and volcanic eruptions Shanghai, this will become a disaster. Changes in atmospheric composition Some biologists believe that it is more active, aggressive animals such as mammals, similar to the single arch animals need more oxygen than other animals, they may be due to changes in atmospheric composition extinction. Because the temperature of the lower Permian sea level will lead to the decline. The vast sea-bed area will be left exposed coal, releasing carbon dioxide into the atmosphere, the oxygen content in the atmosphere will be reduced. Volcanic activity Volcanic eruptions emit large quantities of gases and volcanic dust into the atmosphere. Ash, dust will not only suffocate animals may also be obscured sunlight, reducing the global temperature. Therefore, the volcanic activity may also be the end-Permian extinction event is one of the reasons. Siberia, once discovered that the violent eruption of the volcano ejected material. The ravages of the desert Permian collision of continental blocks to form a large contiguous Pangaea. Rain and fog from the sea can no longer further inland. So some areas of the Permian is getting dry, hot, resulting in increasingly wide range of desert, arid environment of plants and animals can not adapt became extinct.
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Extinct species
Trilobite arthropods only a few representatives of gastropods and bivalves have a new development. Permian, rugose corals, horizontal plate corals, bamboo pole class, all trilobite extinction; brachiopods greatly reduced, the few remaining categories. Flourished in the early Paleozoic trilobites, rugose corals, horizontal plate corals, dragonflies, and all classes extinction foraminifera and crinoids, brachiopods, ammonoids, echinoderms, bryozoans, also suffered a serious blow.
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New interpretation of mass extinction
In early 2008, the Chinese Academy of Sciences, Nanjing Paleontology Cao young group and other researchers on the south wing of Xinjiang and the peach garden of Longkou the organic carbon isotope profile of the end of the Permian there found two negative anomalies, which will terrestrial ecosystems collapse divided into two acts, and proposed terrestrial ecosystems to reflect the mass extinctions may be earlier than the new view of marine ecosystems, in order to investigate the end-Permian extinction event mechanism provides a new interpretation. EPSL internationally renowned publication has been published in the online edition of the results. The study combined land and sea phase formation biomarkers, chain fungi / algae and other debris and evidence of magnetic susceptibility contrast, the establishment of continental strata in Xinjiang region in China marine strata in Meishan Permian - Triassic the evolution of the carbon isotope contrast between the precise, that before the end-Permian extinction event occurred the same sea organic carbon isotope reduce incident was due to lower sea levels caused by stagnation of hydrogen sulfide-rich, oxygen-deficient the existence of the marine environment and its atmosphere and terrestrial ecosystems of the deep. The sea, continental ecosystems abnormal sensitivity to environmental differences, making the end-Permian terrestrial ecosystems, reflecting earlier in the marine ecosystem, which supported the 2005 core drilling through the samples of Meishan section, Zhejiang Institute concluded , that is rich in marine photosynthetic water environment of hydrogen sulfide as the end-Permian extinction the dominant factor. This conclusion is representative for the South African Karoo Basin Triassic vertebrate Lystrosaurus the early appearance of the Permian - Triassic, the emergence of abnormal pollen morphology and fossil pollen and Mixed transition and fossil ostracods the face of a sharp early change provides a reasonable explanation. The study also proved the southern wing of the profile Dalongkou continental strata, represented a more complete development of the Permian - Triassic sedimentary transition period, more than Australia and Antarctica's continental stratigraphic section.