Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 13. 1987. (Budapest, 1987)

while the sample Kism-3.2. reflects the effect of granitization (increased K-value in the ÁKF plane). ) The projection of the chloritized biotite schist sample (Kaba-D3. 6.) in the ACF triangle differs significantly from those of the para-rocks mentioned above, and suggests genetic connection to the amphibolites. The main element ratios of the amphibolite samples do not allow to make genetic distinctions. On the basis of their relatively high Co, Ni, and varying Cr contents, basic magmatic origin seems to be more probable. Table 1 Chemical composition of metamorphic rock samples from the surroundings of the Derecske Depression (Weight%) 1. 2. 3. 4. 5. 6. 7. 8. 9. sio

2 60. 30 62.90 59. 20 62. 94 73. 05 62.81 34. 60 46. 60 49. 30 Ti0

2 0. 81 0. 75 0. 81 1. 14 0.25 0.98 3.29 1.04 2.09 Al

2°3 18. 60 17. 50 19. 20 16, 26 13.04 19. 12 10, 61 15. 50 14.90 Fe

2°: i 1. 23 1. 22 1. 66 0. 51 1. 28 1. 07 2.25 9. 72 4. 61 FeO 6.23 4. 56 5. 71 4. 88 1. 52 4. 74 11, 16 1.22 8. 72 MnO 0. 16 0. 15 0. 14 0.08 0. 06 0. 03 0. 08 0. 18 0. 24 MgO 2. 00 1. 83 2. 34 2. 86 0. 50 1. 22 6. 84 5.92 5.62 CaO 1. 28 1. 60 1. 30 2. 42 0. 92 1. 13 12. 68 11. 20 8. 85 Na

2

0 1. 51 2. 28 1.84 4. 76 3. 78 2.95 1. 66 3. 11 3. 35 K

2° 3. 11 2. 56 2. 79 0. 88 3. 76 3. 65 0.95 0. 65 0. 82 +H

2° 2. 26 4. 27 3. 13 2. 26 0. 67 2.44 5. 51 2. 22 1. 36 -H

2

0 0. 07 0. 07 0. 20 0. 03 0. 08 0.01 0. 56 0. 14 0. 11 C

°2 1. 44 0. 00 0. 83 0. 88 0. 63 0. 70 10. 13 0. 94 0. 04 P

2°5 0. 16 0. 13 0. 09 0. 16 0. 14 0. 14 0. 36 0. 08 0. 10 Total 99. 16 99. 82 99. 24 100.02 99. 68 100.99 100.68 98. 52 100.11 1. Álm-1. 9. (2767.02769. 0m): j »arnet. staurolite bearing biotite-muscovite j meiss 2. Álm-1. 10. (2822. 0 -2826.0m): H 1

1 " H 3. Aim-3. 10. (2355.0 -2358. 0m): " il " " 4. Aim-6. 4. (2465.0 -2467.0m): biotite -muscovite gneiss (sericitic, chloritic) 5. Kism-3. 3. (1015.0 -1021.0m): blastomylonite of migmatite origin 6. Kaba-D4. 1/C. (2174-2192 m): blastomylonitic, garnet. staurolite bearing muscovitebiotite schist 7. Kaba-D2. 6/A. (2076-2078 m ): chloritized (a mphibolite- bearing ? ) biotite schist 8. Mp- 1. 10/1. (3195. 0-3197. 0m): amphibolite 9. Mp-1. 10/2. ( " ): REGIONAL METAMORPHIC EVENTS The first i detectable regional dynamothermal event was composed of several episodes showing continuous transitions due to the gradually changing physical conditions. These episodes can be separated most completely in the graphite-bearing gneiss and mica schist varieties of the Álmosd area. 1. In the first, prograde, syn-tectonic phase rotational ("snowball") garnet porphyroblasts (Plate I: 1) were formed in the matrix containing elongated grains of quartz, oligo1 1