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182Hf-182W isotope systematics of chondrites, eucrites, and martian meteorites: Chronology of core formation and early mantle differentiation in Vesta and Mars
Abstract The timescale of accretion and differentiation of asteroids and the terrestrial planets can be constrained using the extinct 182Hf-182W isotope system. We present new Hf-W data for sevenExpand
Accretionary dust mantles in CM chondrites: Evidence for solar nebula processes
Abstract The texture and modal composition of fourteen carbonaceous chondrites of the CM group were studied in detail to unravel the origin of their various components and the evolution of theirExpand
Identification of the giant impactor Theia in lunar rocks
Triple oxygen isotope data reveal a 12 ± 3 parts per million difference in Δ17O between Earth and the Moon, which supports the giant impact hypothesis of Moon formation, and show that enstatite chondrites and Earth have different Δ 17O values, and speculate on an enstatITE chondrite–like composition of Theia. Expand
Cryptomare magmatism 4.35 Gyr ago recorded in lunar meteorite Kalahari 009
It is suggested that mare basalt volcanism on the Moon started as early as 4.35 ± 0.15 billion years ago, relatively soon after its formation and differentiation, and preceding the bulk of lunar volcanism which ensued after the late heavy bombardment around 3.8-3.9 Gyr. Expand
Shock metamorphism as a fundamental process in the evolution of planetary bodies; information from meteorites
Shock effects in meteorites comprise two major phenomena: (1) Shock metamorphism defined as the mechanical deformation and transformation of rocks below or above the solidus by shock compression andExpand
Carbonates in CI chondrites: clues to parent body evolution.
All CI chondrites are regolith breccias consisting of various types of chemically and mineralogically distinct mineral and lithic fragments (or units). In the CI chondrite Ivuna, for example, fourExpand
Mineralogy and chemistry of Rumuruti: The first meteorite fall of the new R chondrite group
Abstract— The Rumuruti meteorite shower fell in Rumuruti, Kenya, on 1934 January 28 at 10:43 p.m. Rumuruti is an olivine-rich chondritic breccia with light-dark structure. Based on the coexistence ofExpand
Al-rich objects in ordinary chondrites: Related origin of carbonaceous and ordinary chondrites and their constituents
Ca-Al-rich inclusions (CAIs), common constituents of carbonaceous chondrites, have been studied extensively because they contain refractory, high-temperature minerals, suggesting that they formed atExpand
Acfer 094, a uniquely primitive carbonaceous chondrite from the Sahara
— The Saharan meteorite Acfer 094 is a unique type of carbonaceous chondrite. Mineralogical and petrological considerations and O isotopes are unable to distinguish unambiguously between a CO3 vs.Expand