[ad_1]
The banded iron formation, located in western China, has been conclusively dated as Cambrian. About 527 million years ago, this training is young compared to the majority of discoveries so far. The deposition of banded iron formations, which began about 3.8 billion years ago, was long considered to be completed before the start of the Cambrian period 540 million years ago [19659002] "This is critical because it is the first observation of a Precambrian Early Cambrian iron band formation is the most conclusive evidence of the presence of iron-rich conditions at a time, confirming this. which has been recently suggested by geochemical representatives, "said Kurt Konhauser, professor at the Department of Earth and Atmospheric Sciences and co-author.Konhauser oversaw research conducted by Zhiquan Li, a doctoral candidate of Beijing while it was in exchange at Ilberta
The early Cambrian is known for the growth of animals, so the level of oxygen in the seawater should have been close to the levels. "This is important because the Oxygen availability has long been considered a hand brake on the evolution of complex life, and that should have been mitigated by the early Cambrian, "says Leslie Robbins, PhD candidate in the laboratory of Konhauser et al.
Researchers compared geological features and geochemistry with ancient and modern samples to find an badogue for their deposit. The team relied on the use of rare earth element patterns to demonstrate that the deposit was forming in or near a chemocline in a stratified iron-rich basin
"Future studies will attempt to quantify the full extent of these iron bands" [traduction] Kurt Konhauser
