Rocky relationship

Authors

  • Anonymous


Abstract

The core of the Earth is a little younger than previously thought, according to two University of Michigan geochemists. Studying the composition of rocks and meteorites, the pair believe they have found direct evidence that Earth's metallic core and its moon formed no less than 62 million years after the creation of the solar system. Previous estimates had placed core formation anywhere from 15–50 million years after the solar system got started.

Der-Chuen Lee and Alexander Halliday used a process known as MC-ICPMS (multiple collector inductively coupled plasma magnetic sector mass spectrometry) to compare Hafnium and tungsten isotopes in chondrites (primitive meteorites), silicate Earth rocks, lunar basalt from the Apollo 14 mission, and two iron meteorites, which are considered to be remnants of the original cores of small planetesimals.

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