A study led by the University of Queensland found that lava samples reveal new truths about the geological composition of the Earth’s crust and may affect early warning systems for volcanic eruptions.
Dr. Teresaubide, a UQ volcanologist, previously understood that the cooled lava from so-called “hotspot” volcanoes was the “original” magma from the melted mantle, tens of kilometers below the surface. Said he was.
“This is not entirely true. We have been misunderstood and geologically deceived,” said Dr. Ubide.
“For decades, we’ve considered hotspot volcanoes to be messengers from the Earth’s mantle, giving us a glimpse of what’s happening at our feet.
“But these volcanoes are very complex inside and filter the surface with melts that are very different from what we expected.
“this is VolcanoA complex plumbing system that forces many minerals in magma to crystallize. “
Dr. Ubide said the minerals are being recycled by rising magma, transforming their overall chemistry into a “appearance” primitive.
“We found that hotspot volcanoes filter the melt and become very erupting at the base of the crust, a few kilometers below the volcano,” she said.
“Observation of the volcano can indicate that the magma has reached the bottom of the crust. This filtering process reaches the“ turning point ”that leads to the eruption.
“Our results support the idea that magma detection at the crust-mantle boundary may indicate future eruptions.
“This new information is one step closer to improving volcanic anxiety surveillance aimed at protecting life, infrastructure and crops.”
Hotspot volcanoes make up some of the most beautiful landscapes in the world, including the Canary Islands in the Atlantic Ocean and Hawaii in the Pacific Ocean.
An international team of researchers analyzed a new rock sample from El Hierro Island in the Canary Islands of Spain, just southwest of Morocco.
This data was combined with hundreds of published data Geochemical data From El Hierro Island, including the 2011 and 2012 underwater eruptions.
Next, the team tested the findings on data from hotspot volcanoes on marine islands around the world, including Hawaii.
Dr. Ubide said hotspot volcanoes are also in Australia.
“People in southeastern Queenslander will be very familiar with the large tweed shield volcanoes, including the Grasshouse Mountains and Wolmbin (Mount Warning) in New South Wales,” she said.
“Hotspot volcanoes can pop up” everywhere “in contrast to most other volcanoes that result from the collision of structural plates with each other, such as the Ring of Fire in Japan and New Zealand. Structural plate Apart from each other, create the Atlantic Ocean, for example.
“The hotspot volcano in southeastern Queensland was active millions of years ago.
“They have a huge amount magma Create an excellent laboratory for exploring the roots of volcanic activity.
“There are also dormant volcanoes in South Australia that can erupt with little warning, which will benefit from better geological markers for early detection.”
Teresa Ubide et al, Kaijima Basalt Geochemical Volcanic Piping Filter, Geology (2021). DOI: 10.1130 / G49224.1
University of Queensland
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