The researchers searched for halite, a sea salt that may preserve geologic history.
Lithium is described as a trace element that has "sustained a seven-fold decrease" during the last 150 million years, which an increase in magnesium-to-calcium ratios has accompanied.The authors propose that the fall in lithium levels in seawater is connected to "reduced production of oceanic crust and decreased seafloor hydrothermal activity." Both of these aspects influence the movement of the Earth's tectonic plates.
The results showcased that the reduction in the plate movement activity over the last 150 million years appears to have resulted in less lithium being supplied to the ocean. While it also resulted in less carbon dioxide being emitted into the atmosphere, eventually leading to global cooling and the ice age.
“There is a close link between ocean chemistry and atmospheric chemistry. Whatever changes happen in the ocean also reflect what’s happening in the atmosphere,” said Mebrahtu Weldeghebriel, the lead author of this study. The findings have significant implications for understanding the chemistry of ancient oceans and how tectonic plate movement shaped the chemical makeup of our planet's hydrosphere and atmosphere.These changes, in turn, impact the biology of numerous creatures, for instance, marine organisms with shells made of chemical compound calcium carbonate.
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