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Table 3 Composition of phengite, paragonite and chlorite in TGU eclogite SW9

From: The Theodul Glacier Unit, a slab of pre-Alpine rocks in the Alpine meta-ophiolite of Zermatt-Saas, Western Alps

 PhPhPgPgChlChlChl
321
SiO252.4148.5948.2848.7726.5625.5224.31
TiO20.080.150.040.060.060.120.06
Al2O329.8732.7840.2341.4420.919.2420.4
FeO2.432.180.370.3121.629.5731.81
MnO0.050.030.010.030.060.340.54
MgO3.462.070.280.1217.412.3310.29
CaO0.020.120.130.16   
Na2O0.670.56.676.59   
K2O9.89.341.110.46   
Total98.8196.197.2898.1787.0187.3988.05
Si3.3533.2313.0193.0072.7642.7742.663
Ti0.0040.0080.0020.0030.0050.010.005
Al2.2532.5692.9653.0122.5642.4652.634
Fe2+0.1300.1210.0190.0161.8802.6882.914
Mn0.0030.0020.0000.0020.0050.0310.050
Mg0.3300.2050.0260.0112.6991.9981.680
Ca0.0020.0090.0090.011   
Na0.0830.0640.8080.788   
K0.8000.7920.0890.036   
XMg0.720.630.570.410.5890.4260.365
  1. Mica: Total includes traces of Cr. Traces of F and Cl are close to or below detection limit. XMg = Mg/(Mg + Fe)
  2. Chlorite: Totals contain traces of Cr, Ca, Na and K. (1) chlorite in direct contact to garnet; (2) matrix chlorite intergrown with paragonite; (3) chlorite veins in garnet