【The China Post 每日精選】 | 國際 | 三立新聞網 SETN.COM

【The China Post 每日精選】

英文中國郵報 2017/01/13 06:05:00
  • A-
  • A
  • A+

Scientists closer to solving mystery of contents of Earth's solid core

TOKYO -- Japanese scientists say 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 China Post,英文,中國郵報,精選,台灣 圖/翻攝自中國郵報


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 five percent.

But geophysicist Eiji Ohtani at Tohoku University in northern Japan and his research team suggest that silicon is the most likely candidate.

Ohtani's team conducted experiments on iron-nickel alloys mixed with silicon, subjecting them in the lab 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 five percent of the inner core is composed mostly of silicon," Ohtani told AFP on Wednesday.

He said that 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.

Ohtani cautioned that more work needs to be done to confirm his findings on silicon.

Mystery Element

Some scientists say 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.

But 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 co-exist 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."

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 in December 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.




    詢問106/01/09 冷凍食品達人(享點子)欣光食品的聯絡方式?

    03-452-7272 桃園市中壢工業區南園路2-46號

    詢問106/01/16 所長茶葉蛋的聯絡方式?

    06-590-9198 台南市新化區忠孝路19號

    詢問106/01/12 雲林--水哥玫瑰番茄的聯絡方式?

    05-790-6580 雲林縣口湖鄉水井村172號

    詢問106/01/15 百年牛肉麵店(加湯得加40元)的店家聯絡方式?

    02-2558-9835 全春發牛肉麵店

    詢問106/01/16 圍爐大菜超值賣的聯絡方式?

    五餅二魚 0934-002-962

    詢問105/11/07 保暖衣褲組(BEAYTIQUE)的聯絡方式?

    0809-035-858 電電購

    詢問106/01/16 和珅洗衣機(清洗洗衣機)的聯絡方式?

    07-373-9955 0927-067-719、0938-012-785 高雄市仁武區成功路125之2號C棟

    詢問106/01/19 農純鄉滴雞精的聯絡方式?


    詢問105/01/15 牛頭牌直熱式不銹鋼電鍋 的聯絡方式?


    105/01/14 懶人椅的聯絡方式?

    02-2901-5488 H&D居家生活館 新北市新莊區三和路37-2號
    關於三立 | 關於三立新聞網 | 隱私權政策 | 三立新聞自律守則 | 合作提案窗口 | 企業徵才 | 頻道位置 | 意見反映 | 我要爆料

    ©2017 Sanlih E-Television All Rights Reserved 版權所有 盜用必究 台北市內湖區舊宗路一段159號 02-8792-8888