Development and Growth of a Neoproterozoic Active Plate Margin
PhDs and postgraduate research
Self-funded PhD students only
School of Earth and Environmental Sciences
February and October
Applications accepted all year round
The late Neoproterozoic era is marked globally by extensional tectonics, following the break-up of Rodinia and formation of new oceans. Global compilations of crustal growth ages suggest little growth of continental crust during this period.
Recent research suggests that continuous subduction and development of magmatic arcs may only result in net continental growth in a retreating subduction setting (such as eastern Australia in Cambrian-Devonian times), rather than advancing settings (such as the modern Andean margin).
These suggestions are intriguing and may relate to larger-scale tectonic processes. The formation of supercontinents may also bias the preservation potential of magmatic arc rocks.
The work will include:
- testing crustal growth models during periods of supercontinent dispersal, such as the late Neoproterozoic
- carrying out fieldwork and getting training in in-situ Laser Ablation ICP-MS techniques
- development of transferable skills for a career in analytical geochemistry and the oil/mineral extraction industries
The Channel Islands and northwest France contain abundant magmatic rocks formed in an arc setting ~620-570 Ma. Basement gneisses, dated at ~2.1 Ga, occur sporadically and Nd model ages of the arc rocks are ~1 Ga. This suggests that the arc was built onto either a continental margin or a microcontinental fragment.
It's not known how much juvenile crust was formed, and the tectonic setting which allowed preservation of this crust during a major period of rifting and drifting is also unclear. One approach is to track the U-Pb age and Hf isotopes within zircons from magmatic rocks spanning the development and growth of the arc and eroded remnants of the arc (overlying younger sediments).
This approach potentially allows the timing of major crustal reworking to be distinguished from juvenile magmatism and, therefore, an isotopic record of the tectonic development of the arc. We can then relate the tectonic setting, along with geological data, to the growth of continental crust in this important period and investigate whether the preservation potential is related to a unique tectonic setting (e.g. a retreating subduction zone) or simply a minor aberration in the overall history of global growth of continental crust.
Fees and funding
Funding availability: Self-funded PhD students only.
PhD full-time and part-time courses are eligible for the UK Government Doctoral Loan (UK and EU students only).
2020/2021 fees (applicable for October 2020 and February 2021 start)
Home/EU/CI full-time students: £4,407 p/a*
Home/EU/CI part-time students: £2,204 p/a*
International full-time students: £16,400 p/a*
International part-time students: £8,200 p/a*
*All fees are subject to annual increase
- A good honours degree or equivalent in a relevant subject or a master’s degree in an appropriate subject.
- Exceptionally, equivalent professional experience and/or qualifications will be considered. All applicants are subject to interview.
- English language proficiency at a minimum of IELTS band 6.5 with no component score below 6.0.
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