[IGPP Everyone] [EPSS Everyone] GEOCHEMINAR on Monday, Nov 20, 4pm

[Kevin McKeegan]

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*GEOCHEMINAR*
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*Dr. Thomas Kruijer*

*Lawrence Livermore National Laboratory*




*Hf-W chronology of iron meteorites: Implications for the radial structure
of the solar protoplanetary disk*



   Jupiter is the largest planet of the Solar System and its formation had
a substantial effect on the dynamics of the solar accretion disk. Knowing
the age of Jupiter, therefore, is key for understanding how the Solar
System evolved toward its present-day architecture. In this talk I will
illustrate that Jupiter’s formation can be empirically inferred using the
isotopic signatures of meteorites.  In particular, using molybdenum and
tungsten isotope signatures of iron meteorites and chondrites, it can be
demonstrated that meteorites derive from two genetically distinct nebular
reservoirs that coexisted and remained spatially separated between ∼1
million years (Ma) and ∼3–4 Ma after Solar System formation. The most
plausible mechanism for this efficient separation is the formation of
Jupiter, opening a gap in the disk and preventing the exchange of material
between the two reservoirs. Our results indicate that Jupiter’s core grew
to ∼20 Earth masses within <1 Ma, making it the oldest planet of the Solar
System. This was most likely followed by a more protracted growth to ∼50
Earth masses until at least ∼3–4 Ma after Solar System formation.


*3853 Slichter (conference room)*


*Monday, November **20th **at 4:00pm*

*all are welcome!*

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Kevin D. McKeegan
Professor of Cosmochemistry & Geochemistry
Dept. of Earth, Planetary, and Space Sciences
UCLA
Los Angeles, CA 90095-1567
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mckeegan at epss.ucla.edu
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