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An QzEnFo 1553 o 1713 o 1890 o 1 8 0 0 1 7 0 0 1700 1 6 0 0 1600 1 5 0 0 150 0 1500 1 4 0 0 1400 Qz Q z A n EnFo A n F o forsterite + enstatite forsterite + liquid forsterite + liquid a n o rth ite + liq u id fo rs te ri te + liq u id tridymite + liquid tridymite + liquid trid ym ite + liq u id a n o rt h ite + liq u id anorthite + liquid enstatite + tridymite a n o rth ite + trid ym itefo rs te ri te + a n o rt h ite T T T e n s ta ti te + li q u id 1300 Fo-An-Qz 1 atm. An QzEnFo 1553 o 1713 o 1543 (binary eutectic) o 1557 (binary peritectic) o 1890 o 1270 o 1229 o ternary eutectic ternary peritectic cotectic curve peritectic curve 1 8 0 0 1 7 0 0 1700 1 6 0 0 1600 1 5 0 0 150 0 1500 1 4 0 0 1400 Qz Q z A n EnFo A n F o forsterite + enstatite forsterite + liquid a n o rth ite + liq u id fo rs te ri te + liq u id tridymite + liquid trid ym ite + liq u id a n o rt h ite + liq u id enstatite + tridymite a n o rth ite + trid ym itefo rs te ri te + a n o rt h ite T T T An QzEnFo P E forsterite + liquid cristobalite + liquid anorthite + liquid e n s ta ti te + li q u id ternary eutectic anorthite, forsterite, and cristobalite crystallize together at point E ternary peritectic anorthite, forsterite, and enstatite crystallize together at point P anorthite forsterite enstatite (last liquid at point P) anorthite SiO enstatite 2 (last liquid at point E) Fo-An-Qz crystallization 1340 (binary eutectic) o 1553 o 1368 (binary eutectic) o 1713 o 1543 (binary eutectic) o 1557 o (binary peritectic) 1890 o anorthite cristobaliteenstatiteforsterite An QzFo 1553 o 1713 o 1890 o A1 liquid A 24% Fo 19% An 57% Qz 57% 24% 19% melt compositions An QzEnFo 1553 o 1713 o 1890 o A1 B1 solid B 31% forsterite 36% anorthite 33% enstatite <1270 o solid A 19% anorthite 47% cristobalite 34% enstatite <1229 o 47% 34% 19% 36% 31% 33% anorthite cristobaliteenstatiteforsterite mineral assemblages An QzEnFo 1553 o 1713 o 1890 o 1 8 0 0 1 7 0 0 1700 1600 1 5 0 0 150 0 1500 1 4 0 0 1400 P A1 B1 C1 A2 B2 liquid A (Fo An Qz )24 19 57 A (> ) A ) E ( 1 2 1550 (1300 1229 ) o o o liquid B (Fo An Qz )54 36 10 B (> B ( ) P (1270 ) 1 2 1550 ) 1300 o o o liquid C (Fo An Qz )40 40 20 C (> C ( ) P (1270 ) E 1 2 1550 ) 1300 (1229 ) o o o o solid A 19% anorthite 47% cristobalite 34% enstatite solid B 31% forsterite 36% anorthite 33% enstatite <1270 o solid C 47% anorthite 3% cristobalite 57% enstatite <1270 o forsterite cristobalite anorthite e n s ta ti tec2 E An QzEnFo 1 8 0 0 1 7 0 0 1700 1600 1 5 0 0 150 0 1500 1400 E P cristobalite anorthite e n s ta ti te T = 1600 liquid Fo An Qz o 54 36 10 14 00 100% melt 0% forsterite 0% anorthite 0% enstatite 0% cristobalite 1 6 0 0 forsterite An QzEnFo 1 8 0 0 1 7 0 0 1 6 0 0 1700 1600 1 5 0 0 150 0 1500 1400 E P forsterite cristobalite anorthite e n s ta ti te T = 1550 liquid Fo An Qz o 54 36 10 14 00 99% melt 1% forsterite 0% anorthite 0% enstatite 0% cristobalite An QzEnFo 1 8 0 0 1 7 0 0 1 6 0 0 1700 1600 1 5 0 0 150 0 1500 1400 E P forsterite cristobalite anorthite e n s ta ti te T = 1500 liquid Fo An Qz o 49 40 11 14 00 90% melt 10% forsterite 0% anorthite 0% enstatite 0% cristobalite An QzEnFo 1 8 0 0 1 7 0 0 1 6 0 0 1700 1600 1 5 0 0 150 0 1500 1400 E P forsterite cristobalite anorthite e n s ta ti te T = 1450 liquid Fo An Qz o 42 46 12 14 00 79% melt 21% forsterite 0% anorthite 0% enstatite 0% cristobalite An QzEnFo 1 8 0 0 1 7 0 0 1 6 0 0 1700 1600 1 5 0 0 150 0 1500 1400 E P forsterite cristobalite anorthite e n s ta ti te T = 1400 liquid Fo An Qz o 37 49 14 14 00 73% melt 27% forsterite 0% anorthite 0% enstatite 0% cristobalite An QzEnFo 1 8 0 0 1 7 0 0 1 6 0 0 1700 1600 1 5 0 0 150 0 1500 1400 E forsterite cristobalite anorthite e n s ta ti te T = 1350 liquid Fo An Qz o 41 54 15 14 00 67% melt 33% forsterite 0% anorthite 0% enstatite 0% cristobalite An QzEnFo 1 8 0 0 1 7 0 0 1 6 0 0 1700 1600 1 5 0 0 150 0 1500 1400 E P forsterite cristobalite anorthite e n s ta ti te T = 1300 liquid Fo An Qz o 28 57 15 14 00 64% melt 36% forsterite 0% anorthite 0% enstatite 0% cristobalite An QzEnFo 1 8 0 0 1 7 0 0 1 6 0 0 1700 1600 1 5 0 0 150 0 1500 1400 E P forsterite cristobalite anorthite e n s ta ti te T = 1300 liquid Fo An Qz o 28 57 15 14 00 60% melt 38% forsterite 2% anorthite 0% enstatite 0% cristobalite An QzEnFo 1 8 0 0 1 7 0 0 1 6 0 0 1700 1600 1 5 0 0 150 0 1500 1400 E P forsterite cristobalite anorthite e n s ta ti te T = 1280 liquid Fo An Qz o 28 57 15 14 00 54% melt 40% forsterite 6% anorthite 0% enstatite 0% cristobalite An QzEnFo 1 8 0 0 1 7 0 0 1 6 0 0 1700 1600 1 5 0 0 1500 14 00 1400 E P T = 1270 liquid Fo An Qz o 25 55 20 forsterite cristobalite anorthite e n s ta ti te 49% melt 42% forsterite 9% anorthite 0% enstatite 0% cristobalite 150 0 An QzEnFo 1 8 0 0 1 7 0 0 1 6 0 0 1700 1600 1 5 0 0 150 0 1500 14 00 1400 E P T = 1269 liquid gone o forsterite cristobalite anorthite e n s ta ti te 0% melt 31% forsterite 36% anorthite 33% enstatite 0% cristobalite
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