Climate change or the impact of meteorites? What killed the dinosaurs? New research finds climate change before the dinosaurs went extinct, but you blame it.
A volcano in India has produced a huge eruption, which is the cause of the devastating climate change on earth. It happened between 66.3 and 66.1 million years ago, before the last dinosaurs went extinct. However, before the disaster caused by the impact of the Chicxulub meteorite, the earth has time to recover, and it can indeed recover.
This work has determined climate change, but it has been determined that this is not the cause of the extinction of the dinosaurs. The cause of the mass extinction of the Cretaceous/Paleogene boundary was the paleoenvironmental disturbance caused by the Chikluub meteorite impact in the Yucatan Peninsula (Mexico), and the main eruption period of Deccan Traps had much less ecological impact than previously estimated . By other authors.
Traces of climate change
Micropaleontologists from Zaragoza and Oxford University have determined the climate change before the extinction of the dinosaurs. According to their research, the rapid global warming was caused by the massive eruption of the Deccan volcano in India.
This climate change stopped 100,000 years before the Cretaceous/Paleogene boundary, which was enough to restore the ecosystem before being hit by the Chicxulub asteroid.
The author points out that the global warming of 2-5ºC, coupled with ocean acidification, is related to the intense volcanic eruption that occurred in India 66.3 to 66.1 million years ago (the so-called Deccan trap).
The research results have been published in the journal Cretaceous Research and are part of Vicente Gilabert’s doctoral dissertation.
The work of a miniature paleontologist
To reconstruct the climate and its impact on marine plankton, micropaleontologists studied the stable isotopes of carbon and oxygen and the evolution of microfossils in the planktonic foraminifera formation.
These protozoa are characterized by rapid evolutionary changes, very rich changes, and significant responses to environmental changes, which make them an excellent tool for dating rocks and assessing past climate changes.
The geochemical expression of Caravaca LMWE is transformed into a significant decrease in the δ value13C and δ18 years oldOr in rocks, this is related to the warming of the sea for a period of time, which is the result of the accumulation of greenhouse gases (such as carbon monoxide) in the Cretaceous atmosphere2 pcs And methane from volcanoes.
Another result of this important volcanic activity during this period was the production of large amounts of acid rain, which increased the dissolution and fragmentation of the foraminifer carbonate shells accumulated in the sediment during this event.
Although there was no obvious species extinction during LMWE, the biological response was complicated. This response includes the flood of planktonic foraminifera species, that is, able to survive under extensive and changing ecological conditions.
Dwarfism: The species has become smaller.
In Caravaca, there are also many species and genera that are suitable for low oxygen levels. This is interpreted as a response to the well-known fact that the solubility of oxygen decreases with increasing water temperature. In the face of global warming during the last Cretaceous period, another important biological strategy is dwarfism, which is the expectation of sexual maturity to achieve faster reproduction. Therefore, in the range corresponding to LMWE, certain species of Caravaca reduced its size by 35%.
The timing of this event coincides with the beginning of the main eruption phase of the Degan River, so it is possible to establish a causal relationship between the two.
However, despite the significant impact of Deccan volcanic activity on the ocean during the LMWE period, the planktonic foraminifera association and Caravaca geochemical markers indicate that the climate and paleoenvironmental conditions before LMWE quickly recovered.
Therefore, this work confirms that the main cause of the Cretaceous/Paleogene boundary mass extinction was the paleoenvironmental disturbance caused by the Chikluub meteorite impact on the Yucatan Peninsula (Mexico), and the main eruption period of the Deccan trap. Ecological impact. It is much lower than the previous estimates of other authors.
Researchers Vicente Gilabert, Ignacio Arenillas, José Antonio Arz, University of Zaragoza (IUCA) Daniel Ferrer (Daniel Ferrer) and Stuart Alan Robinson (University of Oxford) (University of Oxford) discovered the last major event in the world for the first time in Spain (Caravaca, Murcia) Evidence for warming since the Cretaceous: Late Maastricht Warming Event (LMWE).
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