The ongoing homogenization of primordial and late-accreted components in ocean island basalt mantle sources ...

• Main Authors: Peters, Bradley James, Mundl-Petermeier, Andrea, Finlayson, Valerie A.
• Format: Text
• Language: English
• Published: Deutsche Geologische Gesellschaft - Geologische Vereinigung e.V. (DGGV) 2023
• Subjects: Iceland; Ocean Island
• Online Access: https://dx.doi.org/10.48380/wffq-kj52; https://www.dggv.de/e-publikationen/the-ongoing-homogenization-of-primordial-and-late-accreted-components-in-ocean-island-basalt-mantle-sources

The formation of a segregated metallic core is viewed as an inevitable consequence of the growth of larger protoplanets. However, the effect of this process on the distribution of siderophile elements is hugely variable depending on the physiochemical nature of the protoplanet and the pressure and temperature at which metal-silicate equilibration occurs. On Earth, study of this process can be complicated by the overprinting effect of late accretion, which delivered additional siderophile element mass to the Earth. Along with Precambrian-aged mantle-derived rocks, ocean island basalts (OIB) are now recognized as an important source of information about the early siderophile evolution of the deep Earth. We demonstrate that the combined W isotopic and highly siderophile element (HSE) characteristics of major global hotspots (Hawaiʻi, Iceland, Réunion) preserve geochemical signatures secondary to Hadean metal-silicate equilibration that have not been overprinted by late accretion. Further, some OIB preserve ...