Comparative planetology studies are key for understanding the main processes driving planetary formation and evolution. None have been yet applied to pristine asteroids formed in the solar protoplanetary disk, mainly because of their comminution during their 4.5-billion-year collisional lifetime. From remarkable textural, mineralogical, chemical, and thermodynamic similarities, we show that the high-temperature Kudryavy volcano fumarolic environment from Kurile Islands is a likely proxy of the Fe-alkali-halogen metasomatism on the CV and CO carbonaceous chondrite parent bodies. Ca-Fe–rich and Na-Al-Cl–rich secondary silicates in CV and CO chondrites are, thus, inferred to be fumarolic-like incrustations that precipitate from hot and reduced hydrothermal vapors after interactions with the wallrocks during buoyancy-driven Darcy flow percolation. These vapors may originate from the progressive heating and devolatilization of a chondritic protolith on their parent body or are remnant of the cooling of residual local nebular gases at the time of their primary planetesimal accretion.

比较行星学研究是了解驱动行星形成和演化的主要过程的关键。还没有将其应用于太阳原行星盘中形成的原始小行星，这主要是由于它们在45亿年的碰撞寿命中被粉碎了。从显着的结构，矿物学，化学和热力学相似之处，我们表明，库里尔群岛的高温库德里亚维火山富马岩环境很可能是CV和CO碳质球粒陨石母体上Fe-碱盐-卤素交代作用的代表。因此，推断在CV和CO球粒陨石中富含Ca-Fe和Na-Al-Cl的次硅酸盐是富马酸状的结壳，在浮力驱动的达西流中与壁岩相互作用后，它们从热的和还原的热液中析出。渗滤。