Related Experiment Video
Updated: Sep 13, 2025

Separation of Uranium and Thorium for 230Th-U Dating of Submarine Hydrothermal Sulfides
Published on: May 20, 2019
Time of proto-Earth reservoir formation and volatile element depletion from 53Mn-53Cr chronometry
Pascal M Kruttasch1, Klaus Mezger1
1Institut für Geologie, Universität Bern, 3012 Bern, Switzerland.
Abstract:
The 53Mn-53Cr chronometry of Solar System materials constrains the early chemical evolution of the protoplanetary disk, which is critical for planet formation. Mn/Cr ratios in carbonaceous chondrites and the bulk silicate Earth indicate that meteorite parent bodies and Earth have variable depletions in volatile elements compared to the bulk Solar composition. This depletion is a consequence of the local temperature decreasing as a function of heliocentric distance before planetesimal accretion. Back-tracking the present-day ε53Cr composition of the hypothetical proto-Earth fraction shows that the cessation of Mn-Cr fractionation from the bulk Solar composition occurred no later than ~3 Ma after CAI formation, similar to disk regions of carbonaceous chondrites at greater heliocentric distances. The timing of limited solid-gas interaction due to the dissipation of gas from the protoplanetary disk caused the cessation of Mn-Cr fractionation and provides a lower limit on its lifetime.
More Related Videos
06:06Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod
Published on: August 17, 2016
11:50Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
Published on: June 13, 2015
Related Concept Videos
Radioactive Decay and Radiometric Dating
Nuclear Transmutation
Nuclear Stability
To hold positively charged protons together...
The Fossil Record
Global Climate Change
Isotopes
An element's atomic mass, or weight,...