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          地球主要成分分析 原來地球遠古多次遭受隕石碰撞

          發布時間:2017-07-21 編輯:管理員 瀏覽:
          導語:地球形成于沖積過程,由于彼此引力牽引逐漸積累了大量物質,來自加積隕石放射性和持續轟擊新生地球隕石碰撞作用的熱量,足以融化重物質向下沉積,最終形成地球富含鐵的內核,其外側……
          地球主要成分分析 原來地球遠古多次遭受隕石碰撞
           
              地球形成于沖積過程,由于彼此引力牽引逐漸積累了大量物質,來自加積隕石放射性和持續轟擊新生地球隕石碰撞作用的熱量,足以融化重物質向下沉積,最終形成地球富含鐵的內核,其外側是巖石地幔和地殼。
           
              最原始的隕石叫做“球粒狀隕石”,是地球形成的原始物質。之前研究發現頑輝石球粒狀隕石具有非常近似地球的混合同位素,這暗示著頑輝石球粒狀隕石可能是地球起源的原始物質。然而令科學家們感到驚奇的是,與頑輝石球粒狀隕石相比,當前地球成分中硅、鉀和鈉的含量較低,鎂、鈣和鋁含量較高。

          地球主要成分分析 原來地球遠古多次遭受隕石碰撞
           
              目前,科學家首次認為能夠揭曉其中的謎團,美國宇航局約翰遜太空中心行星科學家阿斯瑪-邦吉巴爾(Asmaa Boujibar)是研究報告負責人,他說:“這項研究最令人興奮的是它首次揭曉了一個問題:為什么地球擁有頑輝石球粒狀隕石相同同位素成分,卻具有不同的化學成分?”
           
              地球形成于沖積過程,由于彼此引力牽引逐漸積累了大量物質,來自加積隕石放射性和持續轟擊新生地球隕石碰撞作用的熱量,足以融化重物質向下沉積,最終形成地球富含鐵的內核,其外側是巖石地幔和地殼。

          地球主要成分分析 原來地球遠古多次遭受隕石碰撞
           
              最原始的隕石叫做“球粒狀隕石”,是地球形成的原始物質。之前研究發現頑輝石球粒狀隕石具有非常近似地球的混合同位素,這暗示著頑輝石球粒狀隕石可能是地球起源的原始物質。然而令科學家們感到驚奇的是,與頑輝石球粒狀隕石相比,當前地球成分中硅、鉀和鈉的含量較低,鎂、鈣和鋁含量較高。
           
              目前,科學家首次認為能夠揭曉其中的謎團,美國宇航局約翰遜太空中心行星科學家阿斯瑪-邦吉巴爾(Asmaa Boujibar)是研究報告負責人,他說:“這項研究最令人興奮的是它首次揭曉了一個問題:為什么地球擁有頑輝石球粒狀隕石相同同位素成分,卻具有不同的化學成分?”
           
              研究人員進行了實驗,在不同壓力下熔化頑輝石球粒狀隕石,這一過程模擬加積巖石如何對地球形成期構成影響。實驗結果表明,新生地球的熱量促使巖石構成地殼,其中富含硅元素,而鎂元素相對較低。研究人員計算機模型顯示,多次宇宙碰撞可能使年輕地球表層地殼形成粉末,逐漸脫離地球,最終使地球硅元素大量流失,而保留下來鎂元素。
           
              同時,隕石碰撞地球產生的熱量使鉀、鈉、鈣和鋁氣化脫離地球,然而更多的鈣和鋁濃縮和返回至地球,這將有助于解釋為什么地球元素比例不同于頑輝石球粒狀隕石的比例。邦吉巴爾說:“隕石碰撞導致的地球的熱量損失并不確定,但可能這種碰撞是體積較大、非常熾熱、運行速度很快的隕石。
           
              揭曉隕石碰撞過程將有助于理解地球是如何形成的,如:運行速度很快隕石可能是木星距離地球較近導致的,當木星運行至距離較遠軌道處,引力牽拉作用使隕石達到較高速度,在太陽系形成不久遍布著非常熾熱高溫的隕石。
           
          霍金預言:2060年是世界末日?地球即將毀滅!

          霍金預言 :2060年是 世界末日 ?地球即將毀滅!據悉,霍金預言是在他70大壽前,參加廣播電視節目時候說出來的,霍金預言:未來1000年內,基本可以確定的是地球會因某場大災難而毀滅,如……

          小行星撞擊地球會怎么樣?科學家對死亡人數做評估!

          小行星撞擊地球會怎么樣?科學家對死亡人數做評估!這不是海嘯,也不是地震。甚至連毀滅性的小行星撞擊都不是。不,如果一顆小行星殺死了你,那么小行星的墜落和爆炸所帶來的強風和……

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