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Experiments on Condensation of Calcium Sulfide Grains To Demarcate Environments for the Formation of Enstatite Chondrites
ACS Earth and Space Chemistry ( IF 3.4 ) Pub Date : 2017-11-03 00:00:00 , DOI: 10.1021/acsearthspacechem.7b00076
Kaori Yokoyama 1 , Yuki Kimura 2 , Chihiro Kaito 1
Affiliation  

To achieve a better understanding of material evolution in the early solar system, experiments have been performed to constrain the environments in which many of the dust grains formed. Sulfur is an element whose chemical processes and mineralization of related grains are poorly understood. The high reactivity of sulfur makes it difficult to perform experiments in conventional metallic chambers, because these become heavily contaminated. Nevertheless, sulfur is expected to be a key element to understand processes in the early solar system. Here, we performed experiments on the condensation of calcium sulfide (CaS) in a glass chamber in an attempt to identify constraints on the possible formation environments of components of enstatite chondrites in terms of the effects of oxygen. Condensation experiments showed that calcium sulfate (CaSO4) or solid-solution particles of CaS and calcium oxide (CaO), i.e., [Ca(S,O)], were formed at various partial pressures of oxygen. Our results expand the range of possible conditions for the condensation of meteoritic CaS (oldhamite) from a nebula gas and extend the range of environments for the formation of the parent bodies of enstatite chondrites to include those more-oxidizing environments in the solar nebula, where the atomic ratio of oxygen to sulfur was less than 6 and where CaS could have incorporated oxygen to form Ca(S,O) without the formation of CaSO4.

中文翻译:

硫化钙晶粒凝结划定环境的实验研究

为了更好地理解早期太阳系中的物质演化,已经进行了实验以限制形成许多尘埃颗粒的环境。硫是一种元素,其化学过程和相关晶粒的矿化作用了解甚少。硫的高反应活性使其难以在常规金属腔室内进行实验,因为这些实验被严重污染。然而,预计硫将成为了解早期太阳系过程的关键元素。在这里,我们对玻璃室中的硫化钙(CaS)的缩合进行了实验,以试图根据氧气的影响来确定对顽辉长方晶石成分的可能形成环境的限制。冷凝实验表明,硫酸钙(CaSO4)或CaS和氧化钙(CaO)的固溶颗粒,即[Ca(S,O)],是在各种氧分压下形成的。我们的结果扩大了星云气体中陨石CaS(硫铁矿)凝结的可能条件范围,并扩展了顽辉长方晶陨石母体形成的环境范围,使其涵盖了太阳云中那些更具氧化性的环境,其中氧与硫的原子比小于6,并且CaS可能与氧结合形成Ca(S,O)而不形成CaSO 4
更新日期:2017-11-05
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