Japanese scientists said that silicon is likely the mystery element in the Earth’s inner core, claiming progress on solving one of the planet’s deepest secrets.
The consensus has long been that the center of the planet is composed of about 85 percent iron and 10 percent nickel, with sulfur, oxygen and silicon prime candidates for the other 5 percent.
However, geophysicist Eiji Ohtani at Tohoku University in northern Japan and his research team suggested that silicon is the most likely candidate.
The team conducted experiments on iron-nickel alloys mixed with silicon, subjecting them to the kinds of high temperatures and pressure found in the inner core.
It discovered that the data for the mixed material observed with X-rays matched seismic data — namely, sound velocity, or seismic waves — obtained for the inner core.
“Our latest experiments suggest that the remaining 5 percent of the inner core is composed mostly of silicon,” Ohtani told reporters on Wednesday.
The finding helps understand whether the Earth’s surface was rich in oxygen in its early formation before photosynthesis began, as oxygen has been another potential candidate for the mystery element in the Earth’s inner core, he said.
Ohtani warned that more work needs to be done to confirm his findings on silicon.
Some scientists have said that if the Earth’s inner core contains silicon, then it means the rest of the planet must have been relatively oxygen-rich at the time of its formation, because oxygen that they believe existed when the planet was formed was not confined to the inner core.
However, if the mystery element in the core is oxygen, then the rest of the Earth was oxygen-poor in the beginning.
Ohtani said he does not think oxygen now exists in the inner core, citing the difficulty for silicon and oxygen to coexist in the same place.
“But it doesn’t necessarily mean the rest of the planet was oxygen-rich, because there is a possibility that oxygen did not exist as an element of the Earth at its formation in the first place,” he added.
The Earth is believed to be made up of three main layers: the solid outer layer where creatures, including humans live; the mantle, which is made up of hot magma and other semi-solid materials; and the core at the center.
The core comprises an outer layer of liquid iron and nickel, and an inner layer — a hot dense ball of mostly iron.
Ohtani presented his team’s work at a meeting last month of the American Geophysical Union in San Francisco, and is preparing to submit a research paper to a peer-reviewed scientific journal.
The presentation used a method similar to that applied by his team in a study published in February last year in the peer-reviewed journal Science Advances.
MONEY GRAB: People were rushing to collect bills scattered on the ground after the plane transporting money crashed, which an official said hindered rescue efforts A cargo plane carrying money on Friday crashed near Bolivia’s capital, damaging about a dozen vehicles on highway, scattering bills on the ground and leaving at least 15 people dead and others injured, an official said. Bolivian Minister of Defense Marcelo Salinas said the Hercules C-130 plane was transporting newly printed Bolivian currency when it “landed and veered off the runway” at an airport in El Alto, a city adjacent to La Paz, before ending up in a nearby field. Firefighters managed to put out the flames that engulfed the aircraft. Fire chief Pavel Tovar said at least 15 people died, but
LIKE FATHER, LIKE DAUGHTER: By showing Ju-ae’s ability to handle a weapon, the photos ‘suggest she is indeed receiving training as a successor,’ an academic said North Korea on Saturday released a rare image of leader Kim Jong-un’s teenage daughter firing a rifle at a shooting range, adding to speculation that she is being groomed as his successor. Kim’s daughter, Ju-ae, has long been seen as the next in line to rule the secretive, nuclear-armed state, and took part in a string of recent high-profile outings, including last week’s military parade marking the closing stages of North Korea’s key party congress. Pyongyang’s official Korean Central News Agency (KCNA) released a photo of Ju-ae shooting a rifle at an outdoor shooting range, peering through a rifle scope
India and Canada yesterday reached a string of agreements, including on critical mineral cooperation and a “landmark” uranium supply deal for nuclear power, the countries’ leaders said in New Delhi. The pacts, which also covered technology and promoting the use of renewable energy, were announced after Indian Prime Minister Narendra Modi and Canadian Prime Minister Mark Carney hailed a fresh start in the relationship between their nations. “Our ties have seen a new energy, mutual trust and positivity,” Modi said. Carney’s visit is a key step forward in ties that effectively collapsed in 2023 after Ottawa accused New Delhi
Gaza is rapidly running out of its limited fuel supply and stocks of food staples might become tight, officials said, after Israel blocked the entry of fuel and goods into the war-shattered territory, citing fighting with Iran. The Israeli military closed all Gaza border crossings on Saturday after announcing airstrikes on Iran carried out jointly with the US. Israeli authorities late on Monday night said that they would reopen the Kerem Shalom crossing from Israel to Gaza yesterday, for “gradual entry of humanitarian aid” into the strip, without saying how much. Israeli authorities previously said the crossings could not be operated safely during
RSS