'Domestic' origin of opaque assemblages in refractory inclusions in meteorites
'Domestic' origin of opaque assemblages in refractory inclusions in meteorites
复制标题
陨石中难熔包裹体中不透明组合的“国内”起源
作者：
J. Blum;G. Wasserburg;I. Hutcheon;J. Beckett;E. Stolper
实验研究表明，不透明的组合富含难熔亲铁元素的主机内形成的富钙和富铝夹杂物（CAIs）的出溶，氧化和硫化均匀的合金，而不是聚集的材料在太阳星云形成前的CAIs。因此，这些不透明的集合体并不像人们曾经认为的那样是已知最古老的固体物质，它们也不限制CAI形成之前早期太阳星云的过程。相反，组合记录变化的氧逸度经历的CAIs在缓慢冷却星云和/或行星环境。
Experimental studies indicate that opaque assemblages rich in refractory siderophile elements were formed within host calcium- and aluminium-rich inclusions (CAIs) by exsolution, oxidation and sulphidization of homogeneous alloys, rather than by aggregation of materials in the solar nebula before the formation of CAIs. These opaque assemblages are thus not the oldest known solid materials, as was once thought, and they do not constrain processes in the early solar nebula before CAI formation. Instead, the assemblages record the changing oxygen fugacity experienced by CAIs during slow cooling in nebular and/or planetary environments.