Saal Alberto E, Hauri Erik H
Department of Earth Environmental and Planetary Sciences, Brown University, Providence, RI 02912, USA.
The Earth and Planets Laboratory, Carnegie Institution for Sciences, Washington, DC 20015, USA.
Sci Adv. 2021 Feb 24;7(9). doi: 10.1126/sciadv.abe4641. Print 2021 Feb.
Sulfur isotope variations in mantle-derived lavas provide important constraints on the evolution of planetary bodies. Here, we report the first in situ measurements of sulfur isotope ratios dissolved in primitive volcanic glasses and olivine-hosted melt inclusions recovered from the Moon by the Apollo 15 and 17 missions. The new data reveal large variations in S/S ratios, which positively correlates with sulfur and titanium contents within and between the distinct compositional groups of volcanic glasses analyzed. Our results uncover several magmatic events that fractionated the primordial sulfur isotope composition of the Moon: the segregation of the lunar core and the crystallization of the lunar magma ocean, which led to the formation of the heterogeneous sources of the lunar magmatism, followed by magma degassing during generation, transport, and eruption of the lunar lavas. Whether the Earth's and Moon's interiors share a common S/S ratio remains a matter of debate.
地幔源熔岩中的硫同位素变化为行星体的演化提供了重要限制。在此，我们报告了通过阿波罗15号和17号任务从月球采集的原始火山玻璃和橄榄石寄主熔体包裹体中溶解的硫同位素比值的首次原位测量结果。新数据揭示了S/³⁴S比值的巨大变化，这与所分析的不同成分组火山玻璃内部及之间的硫和钛含量呈正相关。我们的结果揭示了几个使月球原始硫同位素组成发生分馏的岩浆事件：月球核心的分离和月球岩浆海洋的结晶，这导致了月球岩浆作用的非均一源的形成，随后在月球熔岩的产生、运输和喷发过程中发生岩浆脱气。地球和月球内部是否共享一个共同的³²S/³⁴S比值仍是一个有争议的问题。
