Martin Bizzarro

Potassium isotopes reveal lithospheric control on the evolution of deep-sourced carbonated silicate magmas

Kimberlites and related CO2-rich ultramafic rocks such as aillikites commonly show Nd-Hf isotope decoupling (unradiogenic εHf at a given εNd), attributed to either recycled oceanic slabs or interaction with metasomatized continental lithospheric mantle (CLM). We present potassium...

Volatile depletion in rocky planets as a chemical fingerprint of hybrid accretion

Volatile depletion in rocky planets records their formation history. Earth and Mars grew through different hybrid pathways of pebble and planetesimal accretion, providing a new way to interpret the diversity of rocky planets beyond the Solar System.

The parent bodies of Ryugu and Ivuna formed before those of other carbonaceous chondrites

Most carbonaceous chondrite (CC) meteorites contain abundant chondrules, millimeter-scale spherical inclusions of previously molten material. Ivuna-type carbonaceous chondrites (CIs) do not contain chondrules, nor do samples of the carbonaceous asteroid Ryugu. CIs and Ryugu share...

Ryugu and Bennu preserve primordial isotopic heterogeneity absent from the meteorite record

Ivuna-type (CI) carbonaceous chondrites are commonly used as proxies for the composition of the planet-forming disk because their chemical abundances resemble those of the solar photosphere. However, their isotopic uniformity may reflect pervasive alteration and isotopic averagin...