Unmixing Hawaiian cocktails
Article Abstract:
New research into Hawaiian lavas presents evidence from osmium isotopes to back up the view that the Hawaiian mantle plume is an ancient slab of subducted ocean floor. It is claimed that the original changes in isotopic composition with depth in the ocean floor have withstood mantle stirring and are now visible as geographically distributed trends throughout the Hawaiian lavas. Other research indicates that the Os and O isotope variations are derived from melting recycled slabs of ancient ocean floor and related sediments.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Hafnium-tungsten chronometry and the timing terrestrial core formation
Article Abstract:
The Hafnium 182-tungsten 182-system-based meteorite chronometry indicates that the formation of earth's core and the moon occurred around 62 million years after the formation of iron meteorites. Analyses of the tungsten (W) isotope composition in two iron meteorites, a lunar mare basalt and two carbonaceous chondrite reveal a lack of 182-W in iron meteorites. The bulk silicate earth (BSE) exhibits a Hf/W ratio of approximately 22, whereas the Hf/W ratio of the lunar mantle is consistent with BSE.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Core formation on Mars and differentiated asteroids
Article Abstract:
Researchers investigating core formation on Mars and differentiated asteroids have been able to obtain results on basaltic achondrites, believed to be derived from asteroid 4 Vesta and Mars. The siderophile element abundance patterns for both bodies indicate homogenous accretion and core-mantel equilibration. Results seem to imply early termination of accretion of asteroids and Mars, with late planet-scale impacts resulting in longer-lived accretion of larger bodies.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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