The chemical case for Mercury mantle stripping
The chemical case for Mercury mantle stripping
复制标题
汞地幔剥离的化学案例
DOI：
--
复制
发表时间：
2018
影响因子：
3.9
通讯作者：
A. Shahar
中科院分区：
文献类型：
--
作者：
G. Helffrich;R. Brasser;A. Shahar
水星是太阳系最里面的一颗行星，它有一个异常巨大的核心，这促使人们猜测水星在形成后失去了硅酸盐。使用异常高的硫和低铁的组成，其表面和空间大地测量的限制，其核心组成，我们表明水星的化学是兼容的形成在一个更大的行星在至少1.4-2.5倍的水星目前的质量和可能的2-4倍的质量与其他岩石太阳系天体的相似性。要做到这一点，我们应用实验确定的金属硅酸盐分配模型硫汞的硅酸盐。该模型的验证，将其应用到灶神星，其中，当评估在条件下的灶神星自分化，产生的硫含量在HED陨石的范围内的硅酸盐。水星可能已经失去了很大一部分的岩石材料通过影响或本身是一个残余的冲击。独立于任何剥离，因为大量的硅存在于水星的核心，来自水星的硅酸盐陨石碎片可能具有相对于母源的30 Si同位素富集>+ 0.10‰的特征，这可能有助于识别一个新的陨石类别。
AbstractMercury, the Solar System’s innermost planet, has an unusually massive core prompting speculation that the planet lost silicate after it formed. Using the unusually high sulfur and low iron composition of its surface and space geodetic constraints on its core composition, we show Mercury’s chemistry to be compatible with formation in a larger planet at minimum 1.4–2.5 times Mercury’s present mass and possibly 2–4 times its mass by similarity with other rocky Solar System bodies. To do this, we apply an experimentally determined metal-silicate partitioning model for sulfur to Mercury’s silicate. The model is validated by applying it to Vesta, which, when evaluated at the conditions of Vestan self-differentiation, yields sulfur contents in its silicate in the range of HED meteorites. Mercury could have lost a substantial fraction of its rocky material through impacts or by being itself a remnant impactor. Independent of any stripping, because a significant amount of silicon resides in Mercury’s core, silicate meteoritic debris from Mercury would likely be characterized by 30Si isotopic enrichment >+ 0.10‰ relative to parent sources that could aid identification of a new meteorite class.
影响因子：
5
作者：
Armytage, R. M. G.;Georg, R. B.;Halliday, A. N.
通讯作者：
Halliday, A. N.