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VERA Seminar

The short-lived 182Hf-182W chronometer as a window into early solar system formation

Toni Schulz, Department of Lithospheric Research, University of Vienna

During the last decade W isotopes have proven particularly useful as chronometer for several key stages of early solar system evolution. Even though the rare p-process isotope 180W in meteorites might contribute to our understanding of homogenization mechanisms within the protoplanetary disk (e.g., Schulz et al., 2013), the short-lived 182Hf-182W decay-system provides important constraints on the timescales of asteroidal core formation and silicate differentiation (e.g., Schulz et al., 2009, 2010, and 2012).

After a brief introduction to the objects of these investigations (i.e., meteorites), this talk will mainly be focused on the principles and pitfalls of a W-isotope-based chronometry of extraterrestrial matter, as well as on our increasing understanding of the evolution of the early solar system as a result of the numerous studies using the W isotope tool (e.g., Kruijer et al., 2014 and references therein).

Schulz T., Münker C., Palme H., Mezger K. (2009) Hf-W chronometry of the IAB iron meteorite parent body. Earth and Planetary Science Letters 280, 185-193
Schulz T., Münker C., Palme H., Mezger K., Hf-W chronometry of primitive achondrites (2010). Geochimica et Cosmochimica Acta 74, 1706-1718
Schulz T., Upadhyay D., Münker C., Mezger K. (2012) Formation and Exposure-history of non-magmatic iron meteorites and winonaites: Clues from Sm and W isotopes. Geochimica et Cosmochimica Acta 85, 200-212
Schulz T., Münker C., Peters S.T.M. (2013) p-Process 180W anomalies in iron meteorites: nucleosynthetic versus non-nucleosynthetic origins. Earth and Planetary Science Letters 362, 246-257
Kruijer T.S., Touboul M., Fischer-Godde M., Bermingham K.R., Walker R.J., Kleine T. (2014) Protracted core formation and rapid accretion of protoplanets. Science 344, 6188: 1150-1154.


Donnerstag, 28.01.2016    16:30 Uhr

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