Dear colleagues,
I would appreciate if you pass this on to interested students.
Best regards,
Leo Kriegsman
PhD position available at the Department of Geology, University of Turku
project: Melt extraction and restite-melt back reaction in migmatites
research fields: metamorphic petrology, structural geology
funding: Academy of Finland
funding period: 1.1.2000-31.12.2001 (project extension to 31.12.2003 possible)
salary: 8850-10500 FIM per month before tax, around 6150-7000 FIM after tax
Background
Most high-grade terranes show evidence for dehydration melting of hydrous
minerals resulting in the formation of migmatites. The proximity of
leucosome and restite indicates that part of the melt crystallized in situ
and therefore a degree of back reaction between restite and melt is to be
expected. This process has a variety of implications and may affect: (i)
pressures calculated through geobarometry; (ii) reaction line slopes for
equilibria in migmatites; (iii) the shape of P-T paths; (iv) tectonic
settings inferred from such data; (v) leucosome compositions; and (vi)
zircon and monazite morphologies.
Objectives
1. to study the relation between partial melting, melt extraction and
deformation in migmatites
2. to estimate the amount of melt segregation using various techniques
3. to study the effect of back reaction on thermobarometry, the shape of
P-T paths, and inferred tectonic settings
4. to assess the effect of back reaction on trace element distributions in
migmatites
5. to assess the influence of back reaction on zircon and monazite
morphology and U-Pb dates.
Research methods
The project will involve process-oriented fieldwork, intended to document
spatial relations between leucosome, mesosome and melanosome in migmatites
and the association with deformational features. The main target areas are:
(i) Southwestern Finland; (ii) Lake Ladoga area (cooperation with the
Institute of Precambrian Geology in Leningrad); (iii) Southeast Sweden.
Samples will be analysed by optical microscopy to identify reaction
textures between minerals and melts. More advanced techniques to be used
are: (i) microprobe analyses; (ii) geothermobarometry; (iii) geochemical
analyses (major and trace elements); (iv) cathodoluminescence (CL) and
scanning electron microscopic (SEM) investigations of single zircons and
monazites; and (v) U-Pb dating of zircons and monazites (NORDSIM,
Stockholm), depending on approval of applications by the NORDSIM board.
Skills required
The person starting this PhD research should ideally have a solid
background in structural geology as well as metamorphic and (to a lesser
extent) igneous petrology. Knowledge of thermodynamics and linear algebra
are an asset. Laboratory experience is useful but not essential, as most
chemical analyses will be performed in commercial labs. M.Sc. (or
equivalent degree) must have been completed, or evidence must be given of
the graduation date (but no later than 31.3.2000). Good skills in written
and spoken ENGLISH are an absolute requirement. Language skills in Finnish
and Swedish are useful. Field experience, notably independent mapping, are
a major advantage. The succesful candidate is expected to give oral
presentations at (minimum) one international conference per year and should
therefore possess or acquire good communicative skills.
How to apply
Applications should include a curriculum vitae, a list of relevant subjects
(plus grades) followed at university, a one page summary (in English) of
the M.Sc. thesis, and the names and addresses (including telephone, fax,
and e-mail) of two referees. Selection of candidates will start on 7
December until the position is filled. Later applications will only be
considered if no candidate has been selected yet. Please send the
applications to me as (preferably) e-mail attachments (MsWord 6.0/95 for
IBM or MsWord 5.1 for Mac) or by ordinary mail.
For more information, do not hesitate to contact me.
Leo Kriegsman
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Leo M. Kriegsman
Professor of Geology and Mineralogy
Department of Geology fax: +358-2-333 6580
University of Turku tel: +358-2-333 5481
20014 Turku, FINLAND e-mail: [log in to unmask]
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