Direct evidence for crust-mantle differentiation in the late Hadean

Alessandro Maltese, Guillaume Caro, Om Prakash Pandey, Dewashish Upadhyay, Klaus Mezger

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Constraints on the evolution of the silicate Earth between 4.5 and 3.8 billion years ago are limited by the scarcity of pristine geological material from that period. The geodynamic evolution of the early Earth, prior to the preserved rock record, is thus mainly inferred from numerical modelling. To evaluate the geological significance of these simulations, geochronological constraints pertaining to the evolution of the Hadean crust are required. Here we show using Neodymium isotope variations generated by decay of now-extinct 146-Samarium that Paleoarchean rocks from the Singhbhum Craton, India derived from a Hadean depleted mantle reservoir that differentiated 4.19−0.12+0.06 billion years ago. The event postdates Neodymium model ages of mantle depletion inferred from other Archean rocks by 200 million years. This geochronological record is mirrored in the Hafnium isotope composition of the oldest zircon grains, suggesting that Hadean mantle differentiation proceeded via distinct pulses of large-scale magmatic activity and crustal rejuvenation.
Original languageEnglish (US)
JournalCommunications Earth and Environment
Volume3
Issue number1
DOIs
StatePublished - Dec 1 2022
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2023-10-23

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