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| http://dx.doi.org/10.2138/rmg.2016.81.04 | DOI Listing |
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Radiogenic heating sustains long-lived volcanism and magnetic dynamos in super-Earths.
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September 2024
Department of Geosciences, Princeton University, Princeton, NJ, USA.
Radiogenic heat production is fundamental to the energy budget of planets. Roughly half of the heat that Earth loses through its surface today comes from the three long-lived, heat-producing elements (potassium, thorium, and uranium). These three elements have long been believed to be highly lithophile and thus concentrate in the mantle of rocky planets.
View Article and Find Full Text PDFA heterogeneous mantle and crustal structure formed during the early differentiation of Mars.
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May 2024
Université Paris Cité, Institut de Physique du Globe de Paris, CNRS, 1 rue Jussieu, 75005 Paris, France.
Highly siderophile element abundances and Os isotopes of nakhlite and chassignite meteorites demonstrate that they represent a comagmatic suite from Mars. Nakhlites experienced variable assimilation of >2-billion-year-old altered high Re/Os basaltic crust. This basaltic crust is distinct from the ancient crust represented by meteorites Allan Hills 84001 or impact-contaminated Northwest Africa 7034/7533.
View Article and Find Full Text PDFCompositions of iron-meteorite parent bodies constrain the structure of the protoplanetary disk.
Proc Natl Acad Sci U S A
June 2024
Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, CA 90095-1567.
Magmatic iron-meteorite parent bodies are the earliest planetesimals in the Solar System, and they preserve information about conditions and planet-forming processes in the solar nebula. In this study, we include comprehensive elemental compositions and fractional-crystallization modeling for iron meteorites from the cores of five differentiated asteroids from the inner Solar System. Together with previous results of metallic cores from the outer Solar System, we conclude that asteroidal cores from the outer Solar System have smaller sizes, elevated siderophile-element abundances, and simpler crystallization processes than those from the inner Solar System.
View Article and Find Full Text PDFNi isotopes provide a glimpse of Earth's pre-late-veneer mantle.
Sci Adv
December 2023
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, China.
Moderately siderophile (e.g., Ni) and highly siderophile elements (HSEs) in the bulk silicate Earth (BSE) are believed to be partly or near-completely delivered by late accretion after the depletion caused by metallic core formation.
View Article and Find Full Text PDFVestiges of impact-driven three-phase mixing in the chemistry and structure of Earth's mantle.
Proc Natl Acad Sci U S A
October 2023
Department of Space Studies, Southwest Research Institute, Boulder, CO 80302.
Highly siderophile elements (HSEs; namely Ru, Rh, Pd, Re, Os, Ir, Pt, and Au) in Earth's mantle require the addition of metals after the formation of Earth's core. Early, large collisions have the potential to deliver metals, but the details of their mixing with Earth's mantle remain unresolved. As a large projectile disrupts and penetrates Earth's mantle, a fraction of its metallic core may directly merge with Earth's core.
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