How did early earth become our modern world?

Richard W. Carlson, Edward Garnero, T. Mark Harrison, Jie Li, Michael Manga, William F. McDonough, Sujoy Mukhopadhyay, Barbara Romanowicz, David Rubie, Quentin Williams, Shijie Zhong

Research output: Contribution to journalReview article

31 Scopus citations

Abstract

Several features of Earth owe their origin to processes occurring during and shortly following Earth formation. Collisions with planetary embryos caused substantial melting of the growing Earth, leading to prolonged core formation, atmosphere outgassing, and deepening of the magma ocean as Earth grew. Mantle noble gas isotopic compositions and the mantle abundance of elements that partition into the core record this very early Earth differentiation. In contrast, the elements that are not involved in either core or atmosphere formation show surprisingly muted evidence of the fractionation expected during magma ocean crystallization, and even this minimal evidence for early intramantle differentiation appears to have been erased by mantle convection within ∼1.5 billion years of Earth formation. By 4.36 Ga, Earth's surface and shallow interior had reached temperatures similar to those of the present Earth, and mantle melting, and perhaps plate subduction, was producing crustal rock types similar to those seen today. Remnants of early Earth differentiation may still exist in the deep mantle and continue to influence patterns of large-scale mantle convection, sequestration of some trace elements, geomagnetic reversals, vertical motions of continents, and hot-spot volcanism.

Original languageEnglish (US)
Pages (from-to)151-178
Number of pages28
JournalAnnual Review of Earth and Planetary Sciences
Volume42
DOIs
StatePublished - May 2014

Keywords

  • Accretion
  • Differentiation
  • Early Earth
  • Giant impacts
  • LLSVP
  • Magma ocean

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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    Carlson, R. W., Garnero, E., Harrison, T. M., Li, J., Manga, M., McDonough, W. F., Mukhopadhyay, S., Romanowicz, B., Rubie, D., Williams, Q., & Zhong, S. (2014). How did early earth become our modern world? Annual Review of Earth and Planetary Sciences, 42, 151-178. https://doi.org/10.1146/annurev-earth-060313-055016