Hadean geodynamics inferred from time-varying ¹⁴²Nd/¹⁴⁴Nd in the early Earth rock record.

ABSTRACT: Tracking the secular evolution of ¹⁴²Nd/¹⁴⁴Nd anomalies is important towards understanding the crust-mantle dynamics in the early Earth. Excessive scatter in the published data, however, precludes identifying the fine structure of ¹⁴²Nd/¹⁴⁴Nd evolution as the expected variability is on the order of few parts per million. We report ultra-high precision ¹⁴²Nd/¹⁴⁴Nd data for Eoarchean and Palaeoarchean rocks from the Isua Supracrustal Belt (SW Greenland) that show a well-resolved ¹⁴²Nd/¹⁴⁴Nd temporal variability suggesting progressive convective homogenisation of the Hadean Isua depleted mantle. This temporally decreasing ¹⁴²Nd/¹⁴⁴Nd signal provides a direct measure of early mantle dy

SUBMITTER: Saji NS 

PROVIDER: S-EPMC7116189 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature