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No 11 / 55

Magmatic probes through Archean and proterozoic crust in the Svecofennian shield

Date: 1.1.1988-
Code: 26602
Department: Åbo Akademi University / Faculty of Mathematics and Natural Sciences (MNF), Dept. of Geology and Mineralogy
Address: Domkyrkotorget 1, FIN-20500 Åbo
Phone +358-2-2154 505
Fax +358-2-2154 818
E-mail olav.eklund@abo.fi
Project leader: FD Olav Eklund, assistent (t.f. bitr. prof. TY) (1.1.1988-)
Researchers: FL Sören Fröjdö (1.9.1995-31.7.1998)
M.Sci (St.Petersburg) Alexey Shebanov (1.11.1995-31.12.1996)
Type of research: 0 (0=Within duty, 1=Ordered research, 2=Co-operation)
- basic research 75 %
- developmental work 25 %
Finnish funding organizations: Finlands Akademi () FIM 592600
Man months: Totally: 100 months
Keywords: jordskorpan, mineral, maankuori, mineraalit, mantel, basalt, anortosit, rapakivigranit, lamprofyr, magmablandning, termobarometri, mineralkemi, mineralparagenes, kontaminering, mantle, basalt, anorthosite, rapakivigranite, lamprophyre, magmamixing, thermobarometry, mineralchemistry, mineralparagenesis, contamination,

The aim with this projekt is to develope a magmapetrological method, based on microanalyses in minerals (including ion-probe analyses), from which it may be possible to recieve information of the composition, structure and age of different levels of the Earth crust.The hypotesis is: Mantle derived melts crystallize while they ascent through the crust.During the magma ascent, the melts may become contamined by materials derived from the crust whereupon the crystallizing material will be contamined with specific material at certain levels.The contaminants may be included into the crystallizing mineral as melt inclusions, mineral inclusions or as ions into the crystallizing lattice. -Besides common petrological methods pressure (P) anf temperature (T) estimations in minerals with complex crystallization history to recieve information from different levels of crust.


22.2.1996 / 26.2.1996