PhD position on Constraining Hadean ocean geochemistry

The Department of Earth Sciences is looking for a highly motivated PhD candidate with a MSc background in Earth Sciences, Geochemistry or a related field. You will work on the project "Constraining Hadean ocean geochemistry".

Your job
In this four-year study, you will be part of the Dutch PRELIFE consortium, that will investigate the pathways, reactions, and environments leading to life. You will work on the question how silicate weathering developed on the early Earth in dependence of continental growth and how geochemical mineral-water reactions controlled the composition of the first ocean. These processes involve forward weathering (dissolution of primary minerals) and reverse weathering (precipitation of authigenic secondary clays and carbonate precipitation). You will conduct laboratory flow-through experiments to simulate different ambient conditions and various fluid and mineral compositions. Identification of reaction pathways will be done via fluid and solid element as well as stable isotope (Si, Fe, Mg) analyses and thermodynamic modelling. Your findings will be complemented by the outcomes of the other PRELIFE projects, in order to answer the question under which conditions life evolved on Earth.

A personalised training programme will be set up, reflecting your training needs and career objectives. About 20% of your time will be dedicated to this training component, which includes following courses/workshops as well as training on the job in assisting in the Bachelor’s and Master’s programmes of the department at Utrecht University.

We are looking for an enthusiastic and energetic candidate who has a keen interest in the Early Earth and Ocean and who is eager to conduct experiments in the laboratory.

You must have completed your MSc degree in Earth Sciences, Geochemistry or a related discipline by the time the position starts. Preferably, you will also have:

• experience or strong interest in (geochemical) laboratory experimental work and stable isotope systematics;
• experience in thermodynamic modelling is highly appreciated;
• a geochemical background (e.g. MSc thesis topic) and general laboratory work experience is of advantage;
• motivation to cooperate in a diverse and multidisciplinary research team;
• adequate social/verbal/communication skills.

Due to the international character of our research, good command of spoken and written English is essential. We highly encourage applicants from all members of our community and of diverse backgrounds to join us.

• A position for one year, with an extension to a total of four years upon a successful assessment in the first year, and with the specific intent that it results in a doctorate within this period;
• a working week of 38 hours and a gross monthly salary between €2,901 and €3,707 in the case of full-time employment (salary scale P under the Collective Labour Agreement for Dutch Universities (CAO NU));
• 8% holiday pay and 8.3% year-end bonus;
• a pension scheme, partially paid parental leave and flexible terms of employment based on the CAO NU.

In addition to the terms of employment laid down in the CAO NU, Utrecht University has a number of schemes and facilities of its own for employees. This includes schemes facilitating professional development, leave schemes and schemes for sports and cultural activities, as well as discounts on software and other IT products. We also offer access to additional employee benefits through our Terms of Employment Options Model. In this way, we encourage our employees to continue to invest in their growth. For more information, please visit Working at Utrecht University.

A better future for everyone. This ambition motivates our scientists in executing their leading research and inspiring teaching. At Utrecht University, the various disciplines collaborate intensively towards major strategic themes. Our focus is on Dynamics of Youth, Institutions for Open Societies, Life Sciences and Pathways to Sustainability. Sharing science, shaping tomorrow.

Utrecht University’s Faculty of Geosciences studies the Earth: from the Earth’s core to its surface, including man’s spatial and material utilisation of the Earth – always with a focus on sustainability and innovation. With 3,400 students (BSc and MSc) and 720 staff, the faculty is a strong and challenging organisation. The Faculty of Geosciences is organised in four Departments: Earth Sciences, Human Geography & Spatial Planning, Physical Geography, and Sustainable Development.

The Department of Earth Sciences conducts teaching and research across the full range of the solid Earth and environmental Earth sciences, with activities in almost all areas of geology, geochemistry, geophysics, biogeology and hydrogeology. Our key research themes are Earth & Planetary Processes, Sustainable Use of the Subsurface, Planetary Health & Environment, and Climate & Life. The department hosts a highly international tenured staff of over 50 scientists and more than 110 PhD candidates and postdoctoral researchers. We house or have access to a wide variety of world-class laboratories, among which are UU’s Electron Microscopy Centre, the Geolab, and the Earth Simulation Laboratory. Moreover, the department has excellent High-Performance Computing facilities.

The department is located at the Utrecht Science Park. Utrecht is the fourth largest city in the Netherlands with a population of nearly 360,000 and forms a hub in the middle of the country. Its historical city centre and its modern central station can easily be reached from the Science Park by public transport or by a 15-minute bicycle ride. Utrecht boasts beautiful canals with extraordinary wharf cellars housing cafés and terraces by the water, as well as a broad variety of shops and boutiques.

For more information, please contact Dr Sonja Geilert at s.geilert@uu.nl.

Note that international candidates that need a visa/work permit for the Netherlands require at least four months processing time after selection and acceptance. This will be arranged with help of the International Service Desk (ISD) of our university. Finding appropriate housing in or near Utrecht is your own responsibility, but the ISD may be able to advise you therewith. Unfortunately, we must warn that it is a tight market at the moment. In case of general questions about working and living in The Netherlands, please consult the Dutch Mobility Portal.

Candidates for this vacancy will be recruited by Utrecht University. Commercial response to this ad is not appreciated.

As Utrecht University, we want to be a home for everyone. We value staff with diverse backgrounds, perspectives and identities, including cultural, religious or ethnic background, gender, sexual orientation, disability or age. We strive to create a safe and inclusive environment in which everyone can flourish and contribute.

To apply, please send the following documents via the ‘apply now’ button:

• your curriculum vitae, including any courses taken that are relevant for the position;
• your motivation letter;
• academic credentials (mark sheets and degree statements).

No reference letters need to be submitted in your initial application. If you are shortlisted, we will contact you for referees. We aim for a quick selection procedure after the application deadline, with online interviews with long-list candidates mid-June and in-person interviews with short-list candidates mid-July. The preferred starting date is no later than autumn 2025.