Extended Data Fig. 3: Schematics of the Lu–Hf isotopic evolution of an object subjected to secondary Lu-loss.
From: Late fluid flow in a primitive asteroid revealed by Lu–Hf isotopes in Ryugu
We consider the case in which the object formed at t0 and lost Lu with a proportion p at a time ∆t after the formation. a. Radioactive decay and loss of 176Lu. b. Radiogenic growth of 176Hf. c. 176Hf/177Hf versus 176Lu/177Hf isochron diagram. Subscripts ‘0’ and ‘sample’ refer to the initial (at t0) and present values in the object, respectively. Notation is the same as equation (1). The (176Hf/177Hf)0 value of the object can be regarded as the same as the meteorite zircon value30. The degree of apparent 176Hf excess (∆176Hfsample) is a function of the extent (p) and timing (∆t) of Lu-loss.
