Processes and Components of Migmatites
This article covers partial melting, migmatites, melt extraction, mesosome, leucosome, melanosome, and the mineral components of metatexites, diatexites, and dirty granites.
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1. Partial melting 3. Migmatites and melt extraction
2. Partially molten rocks
3. MESOSOME = Not melted LEUCOSOME = Liquid = granitic magma MELANOSOME = Residue
4. Biot Plg Qz KF Biot Plg Qz KF
5. Metatexites Diatexites Dirty granites
6. Rhologie des roches partiellement fondues
7. Melt extraction
8. Brown, 1994
19. Melt depletion
20. An experimental study of melt extraction J. Barraud, PhD 2000
21. Gomtrie du modle cire 25 cm 6-7 cm Cire = paraffine = mlange dhydrocarbures lourds (alcanes) Forte anisotropie planaire = foliation
22. 1 mm La cire vue au microscope optique A 60C : - fusion modre (15-20%) - porosit connecte
24. (Films)
25. Films 2
26. Evolution de la dformation 1) 5% de raccourcissement 2) 22% de raccourcissement
27. 4) 36% de raccourcissement 3) 30% de raccourcissement Le pli devient asymtrique et un des flancs volue en zone de cisaillement. La distribution htrogne du liquide permet de localiser la dformation. Zone de cisaillement Bande de cisaillement
28. Melt extraction: role of deformation
29. Burg et al., 1994 Melting and migmatitic domes migmatites in orogenic belts The Velay dome
30. Carte France au millionime 6me dition, 1996, BRGM .
33. Lardeaux et al. 2001
34. P-T path in analog terranes in W. Himalayas
35. From melt formation to granites Scale varies 2 3 4 1
