Soft X-Ray EPMA Analyses of Extremely Reduced Phases from Apollo 16 Regolith: Problems and Solutions for Sub-Micron Analysis
نویسندگان
چکیده
منابع مشابه
A Study of Apollo 16 Feldspathic Glasses: Locally Produced or Ballistically Deposited?
Introduction: Continuous bombardment by aster-oidal and cometary debris over the last 4.5 Ga has churned the lunar surface into a fine-grained regolith. The violent nature of these impacts has largely destroyed the primordial lunar crust, reworking it into a variety of breccia and glass fragments that make up the majority of most Apollo soils. Nowhere is this more true than at the Apollo 16 sit...
متن کاملNative Silicon and Fe-silicides from the Apollo 16 Lunar Regolith: Extreme Reduction, Metal-silicate Immiscibility, and Shock Melting
Silicon in metallic form – dissolved in Fe-Ni metal, as silicide, or as Si 0 – is rare in solar system materials because its formation requires extremely reducing temperatures or oxidation states or both. Fe-Ni metal in carbonaceous chondrites can contain small proportions of Si [1], as does metal in shocked enstatite chondrites and aubrites [2]. Iron silicides are known from ureilite meteorite...
متن کاملToward a facile synthesis of spherical sub-micron mesoporous silica: Effect of surfactant concentration
In this paper, a facile method for preparing sub-micron spherical mesoporous silica by the sol-gel process and cationic surfactant cetyltrimethylammonium bromide (CTAB) as a soft template was reported. Moreover, the effect of surfactant concentration on the specific surface area and the total pore volume was investigated. The specific surface area, pore characteristic, morphology, chemical comp...
متن کاملSimultaneous determination of sunset yellow and tartrazine in soft drinks samples using nanocrystallites of spinel ferrite- modified electrode
The ZnCrFeO4 nanoparticles were synthesized as antiferromagnetic material using sol-gel method. The X-ray diffraction (XRD) analysis and transmission electron microscopy (TEM) certified that ZnCrFeO4 nanoparticles have single-phase cubic structure with a range of 50–100 nm in size. A facile and sensitive analytical method was developed for simultaneous determination of sun...
متن کاملModeling the provenance of the Apollo 16 regolith
[1] The regolith at the Apollo 16 landing site, the only Apollo landing site in the central lunar highlands, contains material derived from a number of sources. A model that accounts for the introduction of basin ejecta and mixing of the megaregolith is used to estimate the abundance of basin material in the Apollo 16 regolith. Megaregolith mixing model estimates of the abundance of primary eje...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2014