THE FORMATION OF AN IMPACT-GENERATED H2O ATMOSPHERE AND ITS IMPLICATIONS FOR THE EARLY THERMAL HISTORY OF THE EARTH
THE FORMATION OF AN IMPACT-GENERATED H2O ATMOSPHERE AND ITS IMPLICATIONS FOR THE EARLY THERMAL HISTORY OF THE EARTH
复制标题
DOI：
10.1029/jb090is02p0c545
复制
发表时间：
1985-01-01
影响因子：
--
通讯作者：
MATSUI, T
中科院分区：
文献类型：
--
作者：
ABE, Y;MATSUI, T
在小行星撞击地球的过程中，挥发性物质发生了冲击脱气，形成了原始大气。一旦这种撞击产生的大气层形成，由于大气层的覆盖效应，由小行星撞击产生的地球表面温度会增加。我们表明，地球表面的吸积完全覆盖着一个“岩浆海洋。”这表明，地球的分异过程是在非常低的压力和高温条件下进行的。这就严格限制了地幔中挥发物的数量，以及地球大气和海洋的形成时间。
During accretion of the earth by planetesimal impacts, shock degassing of volatile materials occurs, and a proto‐atmosphere is formed. Once such an impact‐generated atmosphere is formed, the surface temperature of the earth growing by planetesimal impact increases due to the blanketing effect of the atmosphere. We show that the surface of the accreting earth was covered entirely by a “magma ocean.” This suggests that the differentiation of the earth proceeds under very low pressure and high temperature conditions during its accretion stage. This places a severe constraint on the amount of volatiles in the mantle, and the formation time of the atmosphere and ocean of the earth.