James M D Day,Richard J Walker
James M D Day
Coupled 187Os/188Os and highly siderophile element (HSE: Os, Ir, Ru, Pt, Pd, Re) abundance data are reported for Apollo 12 (12005, 12009, 12019, 12022, 12038, 12039, 12040), Apollo 15 (15555) and Apollo 17 (70135) mare basalts, along with m...
Episodic formation of refractory inclusions in the Solar System and their presolar heritage [0.03%]
太阳系中难熔包体的逐批形成及其前太阳起源
K K Larsen,D Wielandta,M Schillera et al.
K K Larsen et al.
Refractory inclusions [Ca-Al-rich Inclusions (CAIs) and Amoeboid Olivine Aggregates (AOAs)] in primitive meteorites are the oldest Solar System solids. They formed in the hot inner protoplanetary disk and, as such, provide insights into the...
Kaveh Pahlevan,Laura Schaefer,Marc M Hirschmann
Kaveh Pahlevan
The Moon-forming giant impact extensively melts and partially vaporizes the silicate Earth and delivers a substantial mass of metal to Earth's core. The subsequent evolution of the magma ocean and overlying atmosphere has been described by ...
Water on Mars: Insights from apatite in regolith breccia Northwest Africa 7034 [0.03%]
火星上的水：来自西北非洲7034号玄武岩碎屑中磷灰石的启示
Jemma Davidson,Meenakshi Wadhwa,Richard L Hervig et al.
Jemma Davidson et al.
Determining the source of planetary water from the hydrogen isotope compositions of crustal samples is complicated by the overprinting of isotopically diverse source material by geologic and atmospheric processes. As Mars has no plate tecto...
New implications for the origin of the IAB main group iron meteorites and the isotopic evolution of the noncarbonaceous (NC) reservoir [0.03%]
IAB普通群铁陨石母体的起源及其非碳质(NC)储库同位素演化的新的启示
Connor D Hilton,Richard J Walker
Connor D Hilton
The origin of the IAB main group (MG) iron meteorites is explored through consideration of 182W isotopic compositions, thermal modeling of 26Al decay, and mass independent (nucleosynthetic) Mo isotopic compositions of planetesimals formed i...
Matthew C Brennan,Rebecca A Fischer,Jessica C E Irving
Matthew C Brennan
The chemical and physical properties of the interiors of terrestrial planets are largely determined during their formation and differentiation. Modeling a planet's formation provides important insights into the properties of its core and ma...
Constraints on terrestrial planet formation timescales and equilibration processes in the Grand Tack scenario from Hf-W isotopic evolution [0.03%]
grand tack模型中hf-w同位素演化的类地行星形成时间尺度和平衡过程的约束
Nicholas G Zube,Francis Nimmo,Rebecca A Fischer et al.
Nicholas G Zube et al.
We examine 141 N-body simulations of terrestrial planet late-stage accretion that use the Grand Tack scenario, coupling the collisional results with a hafnium-tungsten (Hf-W) isotopic evolution model. Accretion in the Grand Tack scenario re...
Age constraints of Mercury's polar deposits suggest recent delivery of ice [0.03%]
水星极地挥发物沉积物的年龄限制表明近期有冰物质输送到水星极区
Ariel N Deutsch,James W Head rd,Gregory A Neumann
Ariel N Deutsch
Surface ice at the poles of Mercury appears as several-m-thick deposits that are composed of nearly pure water. We provide new age estimates of Mercury's polar deposits from combined analyses of Poisson statistics and direct observations of...
The background temperature of the protoplanetary disk within the first four million years of the Solar System [0.03%]
太阳系初期四百万年内原行星盘的背景温度
Devin L Schrader,Roger R Fu,Steven J Desch et al.
Devin L Schrader et al.
The background temperature of the protoplanetary disk is a fundamental but poorly constrained parameter that strongly influences a wide range of conditions and processes in the early Solar System, including the widespread process(es) by whi...
Effects of core formation on the Hf-W isotopic composition of the Earth and dating of the Moon-forming impact [0.03%]
核心形成对地球的Hf-W同位素组成的影响及月球形成冲击事件的定年问题
Rebecca A Fischer,Francis Nimmo
Rebecca A Fischer
Earth's core formation set the initial compositions of the core and mantle. Various aspects of core formation, such as the degree of metal-silicate equilibration, oxygen fugacity, and depth of equilibration, have significant consequences fo...