Project

Back to overview

Phase relations, compositions and trace element partitioning of solid and mobile phases in the hydrous MORB system at 2 - 3.5 GPa

English title Phase relations, compositions and trace element partitioning of solid and mobile phases in the hydrous MORB system at 2 - 3.5 GPa
Applicant Ulmer Peter
Number 143695
Funding scheme Project funding (Div. I-III)
Research institution Institut für Geochemie und Petrologie ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Geochemistry
Start/End 01.10.2012 - 31.03.2014
Approved amount 81'953.00
Show all

All Disciplines (2)

Discipline
Geochemistry
Mineralogy

Keywords (4)

subduction zone fluids; solid-fluid-melt system; trace element partitioning; experimental petrology

Lay Summary (English)

Lead
Lay summary

This PhD study runs since April 2010 and successfully investigates the phase relations and major and trace element compositions and the trace element partitioning between solid and fluid/melt phases in hydrated Mid-Ocean-Ridge (MOR) basalt/gabbro compositions at 2.0 – 3.5 GPa and temperatures varying from 600 to 1200°C. The project bases on successful precursor projects financed through SNF that have developed unique, state-of-the-art experimental and analytical methods (“diamond trapping” high-pressure experimental technique as well as “frozen” LA-ICP-MS analysis at the very limit of the spatial resolution of the techniques employed (LA-ICP-MS) and planned (SIMS)) to fully characterize compositions and partitioning behavior of solid-fluid-melt systems in deeply subducted oceanic lithosphere. Such quantitative geochemical and thermodynamic data are urgently required to quantify the most important mass transfer system operating within the Earth’s interior, namely the transport and release of mobile phases in subduction zones and the associated metasomatism in the overlying mantle wedge that is ultimately responsible for subduction related magmatism and the formation of economic ore deposits associated with these igneous rocks.

Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Collaboration

Group / person Country
Types of collaboration
SwissSIMS Switzerland (Europe)
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
15th Internation Conference on Experimental Mineralogy, Petrology and Geochemistry (EMPG-XV) Talk given at a conference The release of mobile phases from the slab and the consequences for arc magmatism 05.06.2016 Zurich, Switzerland Pettke Thomas; Luginbühl Stefanie; Ulmer Peter;
Japan Geoscience Union Meeting Talk given at a conference Composition and nature of melts, supercritical fluids and liquids formed by dehydration of subducted oceanic lithosphere 28.04.2014 Yokohama, Japan Luginbühl Stefanie; Ulmer Peter; Pettke Thomas;
Goldschmit Conference Talk given at a conference Experimental partitioning behavior of MORB in subduction zones at 2 and 3 GPa 25.08.2013 Florence, Italy Pettke Thomas; Luginbühl Stefanie; Ulmer Peter;
10th Swiss Geoscience Meeting Talk given at a conference The geochemistry of aqueous fluids and hydrous melts in subduction zones 16.11.2012 Bern, Switzerland Pettke Thomas; Luginbühl Stefanie; Ulmer Peter;


Associated projects

Number Title Start Funding scheme
117604 High Pressure natural fluids in the Earths upper mantle and lower crust 01.01.2008 Project funding (Div. I-III)

Abstract

This proposal requests extension of funds for 1 PhD students for a period of 15 months for the SNF funded project: “High pressure natural fluids in the Earth’s upper mantle and lower crust”; proposal# 200020-117604 originally granted to Alan B. Thompson (P.I) and Peter Ulmer (Co-P.I.).The original project included provisions for 2 PhD students and 1 post-doctoral researcher. In April 2010, we employed Ms Stefanie Luginbühl as a PhD student on the remaining 27 months PhD salary provisions left on the grant. The PhD student successfully investigates the phase relations and major and trace element compositions and the trace element partitioning between solid and fluid/melt phases in hydrated Mid-Ocean-Ridge (MOR) basalt/gabbro compositions at 2.0 - 3.5 GPa and temperatures varying from 600 to 1200°C. The project bases on successful precursor projects financed through SNF that have developed unique, state-of-the-art experimental and analytical methods to fully characterize compositions and partitioning behavior of solid-fluid-melt systems in deeply subducted oceanic lithosphere. Such quantitative geochemical and thermodynamic data are urgently required to quantify the most important mass transfer system operating within the Earth’s interior, namely the transport and release of mobile phases in subduction zones and the associated metasomatism in the overlying mantle wedge that is ultimately responsible for subduction related magmatism and the formation of economic ore deposits associated with these igneous rocks.Due to the retirement of Alan B. Thompson at the end of the current academic semester (September 2012), the original P.I. is unable to support the PhD student with additional project based and/or ordinary personnel funds beyond this date. The specific subproject started with the employment of Ms Stefanie Luginbühl in April 2010; the salaries available on the original project provided provisions for 27 months and Alan B. Thompson provides an additional 3 months from his personnel funds totaling 30 months until the end of September 2012.Therefore, we, Peter Ulmer (P.I.) and Thomas Pettke (Co-P.I.), request funding for an additional 15 months of salary and limited provisions to cover travel and analytical expenses for the PhD student enabling her to successfully finish the PhD study that is well under way and already produced significant new results. The applicants have already taken over the academic (“Doktorvater” and PhD referee, Peter Ulmer) and scientific (Peter Ulmer and Thomas Pettke) responsibility for this PhD thesis. However, both of us do not have any personal funds other than project based resources available and, thus, we depend on SNF to successfully complete and finalize this highly promising PhD project.The requested amount permits a total duration of the PhD project of 45 months with a terminating date in December 2013; a durations that is well justified by the fact that this is an extremely demanding PhD project including state-of-the-art experiments allowing complete quantitative characterization of solid-liquid-fluid systems employing the “diamond trapping” high-pressure experimental technique as well as “frozen” LA-ICP-MS analysis at the very limit of the spacial resolution of the techniques employed (LA-ICP-MS) and planned (SIMS). In particular the unique opportunity to utilize the newly acquired SIMS (SwissSIMS in Lausanne) starting in early 2013 will open a new, very promising avenue to successfully analyze tiny (5-10 micrometer) solid phases (in particular pyroxenes, Fe-Ti-oxides, epidote-group minerals and amphiboles) that have not been accessible to date.
-