Home

  • Program

    The Goldschmidt2020 program

  • Venue

    All about the venue and city

  • Registration

    Details of how to register to attend the conference and/or submit an abstract

  • Exhibition

    Information for and about exhibitors and sponsors

  • My Goldschmidt

    My program, purchases, connections, etc.

Home

Program

Events

  • Sponsor Seminars

  • Training Events

    These are scheduled events to help delegates test out the tools and platform we will be using for the Q&A and other events at the conference.

  • Workshops

    Our workshop program provides training and teaching in topics across geochemistry and related fields. We are currently liaising with the workshop organisers to ascertain if any workshops can become virtual. Any updates will be added to this page.

Locations

  • Conference Locations

    Location of the convention center and social events

  • Hotels

    The hotels are no longer available to book at the special rates agreed by the conference. Should you wish to cancel or change your hotel reservation please see the details below.

Information

Present your work

Attend

Exhibition

Sponsorships

My Goldschmidt

Role functions

Abstract Details

How has Galactic Chemical Evolution Affected Terrestrial Planet Composition and Tectonics?

O'Neill C

O'Neill C (2020) Goldschmidt Abstracts, 2020 1964

Sorry, the PDF cannot be displayed on your browser.

Download abstract

The author has not provided any additional details.

01a: Room 1, View in program

Craig O'Neill

Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.

Submitted by Larry Nittler on
interesting presentation. I can't be up at 2 am my time for the live Q&A, so I'll ask my question here. We see huge range of core sizes in the rocky planets of our solar system (compare Mercury and Earth) but both formed form a star with a single Fe/Si ratio. This shows that substantial fractionation processes can occur during planet building. Given this, what is the justification for assuming that stellar composition (Fe/Si) translates directly to planet core size?
Great Q Larry. The work here is definitely dealing with population trends. The solar system has examples of large (Mercury) and small (Moon) core bodies, and there appears to be a lot of stochastic and other effects in play (impacts, scattering, grain migration etc). The assumption here is that over a large population (eg. exoplanet catalogues) these stochastic effects average out, and broader trends becpme evident. So here, purely for expediency, we assume an Earth:Solar System element partitioning, holding that as a (poorly known) constant, and compare planetary variations due to that trend. It may be that the stochastic effects are of a similar magnitude to the effects we see, and we get a wide range of planets over the galaxy's evolution, but my feeling is the effects of GCE elemental changes would induce a shift in the geodynamics of these populations, given what we see in the models.

Sign in to ask a question.