New Paper – Mantle Metasomatism, Kimberlite Ascent & Garnet Diffusion

So Mike Jollands and I wrote a paper looking at small scale diffusion in mantle garnet, which shows that the diffusion occurred between 25 days and 400 years before kimberlite ascent (a very short time frame geologically). So that means we have a very rare sample of a mantle metasomatism event that has preserved (possibly a failed kimberlite ascent). It’s in Earth and Planetary Science Letters, feel free to go and read it:

Jollands, M. C., Hanger, B. J, Yaxley, G. M., Kilburn, M. R. and Hermann, J. (2018). Timescales between mantle metasomatism and kimberlite ascent indicated by diffusion profiles in garnet crystals from peridotite xenoliths. Earth and Planetary Science Letters 481, 143-153. 


When is the real ‘end’ of a PhD?


IMG_20140922_153019Recently a number of the original OnCirculation contributors have reached the ‘end’ of their PhDs including Evan, Kelly, Nick and myself; however this has led to the question, ‘When is the true end of the PhD?’ or in popular terms ‘Can I call myself a doctor yet?’. Here in Australia, the PhD approval process is different to many other countries, based on our relative isolation from the rest of world. In this post I am going to talk about the various ‘end’ points and where they fit into the process. These stages are what I have been through or still have to come here at RSES, but are similar to most departments around the country.

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Goldschmidt 2013

Kimberley1I’m heading to Florence this week for the Goldschmidt Conference, where I will be presenting some new results relating to a suite of garnet peridotite xenoliths from the Kimberley pipe, including XANES measurements.

I’ll be talking on Wednesday (28th) at 11.45am in U04 as part of Session 05c: Investigating the origin and modification of cratonic mantle over time: The role of diamonds and xenoliths. My presentation is titled: Oxygen Fugacity in the Kaapvaal Cratonic Lithosphere – Evidence from Fe XANES Measurements of Fe3+ in Garnet from the Kimberley Pipe and you can find the abstract here. I’m also involved in the work relating to Greg Yaxley’s keynote presentation at 2.30pm on Wednesday, here’s the information.

I’m looking forward to a great meeting with lot’s of great science and the chance to meet new people and catch up with old friends.