Mineral chemistry
End-member composition in orthopyroxene of AGC 415 is 0.45 for enstatite and 0.55 for ferrosilite (S-Table 1). Garnet is not only rimmed by biotite (Mg# 48.55) but also quartz and K-feldspar (S-Table 1). Quartz inclusions in garnet represent a residual phase after partial melting of the reaction Bt + Qtz + Pl = Grt + Ksp + liq. The cores of garnet in AGC 415 are higher in Mg# (22.38), pyrope and grossular component with respect to the rim, while almadine is lower. The leucosome consists of quartz, K-feldspar and plagioclase, but mafic components of the melanosome can also be found in leucosomes as well as zircon. Garnet and orthopyroxene may both occur as clusters of grains. The K-feldspar (S-Table 2) contains XSan = 0.84 and XAb = 0.16 in AGC 415, XSan = 0.32 and XAb = 0.66 in AGC 417 and XSan = 0.95 and XAb = 0.05 in AGC 419. Plagioclase (Table 2) contains XAb = 0.68 and XAn = 0.30 in AGC 415, XAb = 0.73 and XAn = 0.24 in AGC 417 and XAb = 0.80 and XAn = 0.17 in AGC 419. Plagioclase in AGC 417 and 419 is located in the leucosome where it is more sodic. AGC 419 displays a decrease in Mg# and increase in XSpss from core to rim (S-Table 1). Euhedral porphyroblasts up to 4-5 mm in diameter are common. Biotite and magnetite were identified in the leucosome. A hight Ti-biotite inclusion in garnet has a higher Mg# (54.82) than a hight Ti-biotite in the matrix (45.83) in AGC 419. The highest biotite Mg# (58.00-58.64) were observed in a biotite inclusion in K-feldspar and in a biotite that rimmed a garnet in AGC 417. Except for slightly less leucosome, AGC 417 is similar to AGC 419.

S-Table 1	
                  AGC415                     AGC 417  AGC 419  AGC 221 
              Grt r	Grt c	Grt	Grt	Grt
	                  AGC415                                       AGC417		AGC419	                  AGC221    
              Bi iGrt	Bi rGrt	Bi m	Bi iKfs	Bi rGrt	Bi iGrt	Bi m          Bi iGrt	                  AGC 415                    AGC221  
               Opx         Opx            Opx	
SiO2	36.97	38.04	37.85	37.12	38.09               
Al2O3	21.59	21.14	21.71	21.47	21.49
Cr2O3	0.17	0.19	0.027	0.00	0.12
FeO	33.71	32.71	31.84	34.7	31.62
MnO	0.80	0.67	0.64	0.82	0.72
MgO	5.20	5.29	6.76	5.21	6.21
CaO	2.14	2.50	1.20	0.93	1.77
Na2O	0.00	0.06	0.00	0.07	0.02
K2O	0.00	0.01	0.01	0.02	0.00
Totals	100.58	100.61	100.04	100.34	100.06
Si	6.00	6.00	5.95	5.91	5.99
AlIV	0.00	0.00	0.05	0.09	0.01
AlVI	3.97	3.93	3.97	3.94	3.98
Cr	0.02	0.02	0.00	0.00	0.00
Fe3+	0.00	0.05	0.02	0.06	0.01
Fe2+	4.37	4.31	4.16	4.62	4.15
Mn	0.09	0.09	0.09	0.11	0.10
Mg	1.17	1.24	1.58	1.24	1.52
Ca	0.37	0.42	0.20	0.16	0.21
Na	0.00	0.02	0.00	0.02	0.05
K	0.00	0.00	0.00	0.00	0.01
Totals	16.00	16.03	16.04	16.09	16.08
XAlm	0.728	0.710	0.690	0.754	0.692
XSpss	0.015	0.015	0.014	0.018	0.016
XPrp	0.195	0.205	0.263	0.202	0.243
XGrs	0.062	0.070	0.033	0.026	0.049
Mg#	21.09	22.38	27.57	21.11	25.96	SiO2	35.20	35.03	34.93	38.34	36.14	35.61	34.40	35.22
TiO2	3.70	3.22	3.18	2.76	2.78	5.00	4.29	3.32
Al2O3	15.70	15.45	15.86	16.24	15.66	15.08	15.20	16.02
Cr2O3	0.20	0.24	0.33	0.00	0.02	0.01	0.01	0.33
FeO	19.09	20.48	19.83	16.15	17.29	17.65	20.65	18.04
MnO	0.00	0.03	0.00	0.01	0.03	0.02	0.08	0.03
MgO	11.24	10.87	10.64	12.51	13.75	12.03	9.64	11.38
Na2O	0.27	0.18	0.22	0.22	0.13	0.20	0.16	0.14
K2O	9.49	9.22	9.27	9.13	8.86	9.50	9.10	8.57
Totals	94.89	94.72	94.28	95.37	94.69	95.10	93.58	93.09
Si	5.42	5.43	5.42	5.71	5.49	5.43	5.41	5.68
Ti	0.43	0.38	0.37	0.31	0.32	0.57	0.51	0.41
AlIV	2.58	2.57	2.58	2.29	2.51	2.57	2.59	2.32
AlVI	0.26	0.25	0.32	0.56	0.29	0.26	0.35	0.73
Cr	0.02	0.04	0.04	0.00	0.00	0.00	0.00	0.04
Fe2+	2.57	2.66	2.58	2.01	2.19	2.25	2.72	2.44
Mn	0.00	0.00	0.00	0.00	0.00	0.00	0.01	0.00
Mg	2.58	2.51	2.46	2.78	3.11	2.73	2.26	2.74
Na	0.08	0.05	0.07	0.06	0.04	0.06	0.05	0.02
K	1.86	1.82	1.84	1.74	1.72	1.85	1.83	1.76
Mg#	51.21	48.55	48.89	58.00	58.64	54.82	45.38	52.93
Totals	15.69	15.42	15.68	15.46	15.67	15.60	15.61	15.27	SiO2	 49.49	49.51	50.04
TiO2	 0.05	0.05	0.02
Al2O3	 1.47	1.40	1.79
FeO	 33.04	33.51	30.55
Cr2O3	 0.05	0.08	0.08
MnO	 0.30	0.27	0.25
MgO	 15.2	15.05	16.46
CaO	 0.30	0.18	0.17
Na2O	 0.08	0.01	0.01
Totals	 100.01	100.07	99.37
Si	 1.95	1.95	1.95
AlIV	 0.05	0.05	0.05
AlVI	 0.01	0.01	0.03
Fe2+	 1.00	1.00	1.00
Cr	 0.00	0.00	0.00
Mn	 0.01	0.01	0.01
Fe3+	 0.08	0.09	0.00
Mg	 0.89	0.88	0.96
Ca	 0.01	0.01	0.01
Na	 0.00	0.00	0.00
Totals	 4.02	4.02	4.01
Enstatit	 0.45	0.45	0.49
Ferrosilite	 0.55	0.55	0.51
Mg#	 45.06	44.46	48.99	
Garnet and biotite compositions from different settings of AGC 415, 417, 419, and 221. Orthopyroxene compositions of AGC 221, 415
XAlm = Fe2+/ (Fe2++ Mn + Mg + Ca). XSpss = Mn / (Fe2+ + Mn + Mg + Ca). XPy = Mg / (Fe2+ + Mn + Mg + Ca). XGrs = Ca / (Fe2+ + Mn + Mg + Ca). Mg# = 100 * Mg / (Mg + Fe2+). Number of ions calculated on the basis of 24 oxygens for garnet. Numbers of ions calculated on the basis of 22 oxygens for biotite. Numbers of ions calculated on the basis of 6 oxygens for orthopyroxene. r=rim, c=core, m=matrix, i=in, rGrt=rimming garnet

S-Table 2
Feldspar compositions of AGC 415, 417, 419
                      AGC415	AGC417		AGC419                          
                  Ksp	Plg	Ksp	Plg	Ksp	Plg	
SiO2	63.67	59.37	59.83	61.33	61.36	62.34
TiO2	0.00	0.00	0.00	0.01	0.00	0.00
Al2O3	18.04	24.11	26.41	23.08	17.68	21.31
FeO	0.00	0.03	0.18	0.04	0.03	0.04
MnO	0.00	0.03	0.01	0.00	0.01	0.01
MgO	0.00	0.00	0.07	0.01	0.01	0.00
CaO	0.01	6.35	0.46	4.96	0.06	3.46
Na2O	1.75	7.87	6.06	8.46	0.6	9.14
K2O	13.99	0.27	4.41	0.45	15.7	0.50
Totals	97.46	98.03	97.44	98.32	95.42	96.80
Si	2.99	2.70	2.72	2.77	2.98	2.85
Ti	0.00	0.00	0.00	0.00	0.00	0.00
Al	1.00	1.29	1.42	1.23	1.01	1.15
Fe2+	0.00	0.00	0.01	0.00	0.00	0.00
Mn	0.00	0.00	0.00	0.00	0.00	0.00
Mg	0.00	0.00	0.01	0.00	0.00	0.00
Ca	0.00	0.31	0.02	0.24	0.00	0.17
Na	0.16	0.69	0.54	0.74	0.05	0.81
K	0.84	0.02	0.26	0.03	0.97	0.03
Totals	5.00	5.01	4.96	5.00	5.02	5.00
XAb	0.16	0.68	0.66	0.73	0.05	0.80
XAn	0.00	0.30	0.02	0.24	0.00	0.17
XSan	0.84	0.02	0.32	0.03	0.95	0.03	
Numbers of ions calculated on the basis of 8 oxygens. XAb = Na / (Ca + Na + K). 
XAn = Ca / (Ca + Na + K). XSan = K / (Ca + Na + K)