Sulfur in apatite from the Nakhla meteorite record a late-stage oxidation event
Sulfur in apatite from the Nakhla meteorite record a late-stage oxidation event
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纳赫拉陨石中的磷灰石中的硫记录了后期氧化事件
DOI：
10.1016/j.epsl.2022.117784
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发表时间：
2022
影响因子：
5.3
通讯作者：
F. McCubbin
中科院分区：
文献类型：
--
作者：
M. Brounce;J. Boyce;F. McCubbin
通过直接观测火星赤霞岩陨石的主要火成斑晶组合，对火星赤霞岩陨石记录的氧逸度（fO 2）的估计范围从与石英-铁橄榄石-磁铁矿氧缓冲区记录的值相似到低两个数量级。根据硫化物和磷灰石化学性质的变化，推断了在结晶、火山脱气和赤霞岩堆堆积物就位的晚期阶段，氧的变化。我们目前的S-XANES测量硫的氧化态磷灰石和相关的介稳态玻璃在Nakhla放置直接约束的变化的大小infO 2经历的Nakhla部分的nakhlite堆在磷灰石结晶过程中。Nakhla磷灰石的范围从主要含有S2−到主要含有S6+。这一点，以及这些磷灰石附近的中稳态玻璃中S2−、Cl和FeO之间的相关性，表明我们的测量直接捕获了间隙晚期Nakhla岩浆的氧化作用，这是Cl饱和和脱气的结果。作为这种脱气的结果，在磷灰石结晶和最后的中静态冷却过程中，至少部分的赤霞岩堆经历了1.5-2.5个数量级的infO 2增加。根据这些测量，其他赤霞岩陨石中磷灰石的硫氧化态预计从完全含S2−到完全含S6+。
Estimates of the oxygen fugacity (fO2) recorded by the Martian nakhlite meteorites from direct observations of the main igneous phenocryst assemblages range from values similar to that recorded by the quartz-fayalite-magnetite oxygen buffer to ∼two orders of magnitude lower. Inferences of changes infO2during the late stages of crystallization, volcanic degassing, and emplacement of the nakhlite cumulate pile have been made based on variable sulfide and apatite chemistry. We present S-XANES measurements of the oxidation state of sulfur in apatite and associated mesostasis glass in Nakhla to place direct constraints on the magnitude of changes infO2experienced by the Nakhla portion of the nakhlite cumulate pile during apatite crystallization. Nakhla apatites range from containing dominantly S2−to containing dominantly S6+. This, together with correlations between S2−, Cl, and FeO in the mesostasis glass near these apatites, suggest that our measurements capture directly the oxidation of the interstitial late-stage Nakhla magmas as the result of Cl-saturation and degassing. As the result of this degassing, at least part of the nakhlite cumulate pile experienced an increase infO2of ∼1.5–2.5 orders of magnitude during apatite crystallization and final mesostasis cooling. Based on these measurements, the sulfur oxidation states of apatites in the other nakhlite meteorites are predicted to range from exclusively S2−-bearing to exclusively S6+-bearing.
影响因子：
5.3
作者：
William M. Nash;D. Smythe;B. Wood
通讯作者：
William M. Nash;D. Smythe;B. Wood