LUNAR VOLCANIC GAS CLOUD EVOLUTION: CONSTRAINTS FROM GLASS BEAD SURFACE SUBLIMATES

This repository hosts the SEM, TEM, APT, and NanoSIMS data collected from the surface mineral deposits on pristine glass beads from Apollo drive tube 74001,431. The deposits are predominantly micromound structures made of nanopolycrystalline sphalerite ((Zn,Fe)S), with iron enrichment at the bead-micromound interface. Thermochemical modelling was then performed using HSC Chemistry. This modelling indicates that hydrogen and sulfur were major elements within the volcanic plume, and ties the iron gradient to decreasing gas pressure during deposition.本仓库收录了取自编号74001、431的阿波罗驱动管中原始未蚀变玻璃珠表面矿物沉积的扫描电子显微镜（Scanning Electron Microscope, SEM）、透射电子显微镜（Transmission Electron Microscope, TEM）、原子探针层析成像（Atom Probe Tomography, APT）以及纳米二次离子质谱（Nanoscale Secondary Ion Mass Spectrometry, NanoSIMS）数据。该矿物沉积以纳米多晶闪锌矿((Zn,Fe)S)构成的微丘结构为主体，且在玻璃珠与微丘的界面处存在铁富集现象。后续通过HSC Chemistry开展了热化学模拟，结果显示氢与硫是火山羽流中的主要元素，并将观测到的铁浓度梯度与沉积过程中的气体压力降低建立了关联。