subsaturada

Cálculo de la Norma CIPW

Pesos moleculares:

SiO2 = 60.08;

TiO2 = 79.9;

Al2O3 = 101.96;

Fe2O3 = 159.69;

FeO = 71.85;

MgO = 40.3;

MnO = 70.94;

CaO = 56.08;

Na2O = 61.98;

K2O = 94.2;

P2O5 = 141.94;           

Minerales s·licos:

Cuarzo (SiO2) = 60.08;

Corindón (Al2O3) = 101.96;

Ortosa (K2O.Al2O3.6SiO2) = 556.64;

Albita (Na2O.Al2O3.6SiO2) = 524.42;

Anortita (CaO.Al2O3.2SiO2) = 278.2;

Nefelina (Na2O.Al2O3.2SiO2) = 284.1;

Leucita (K2O.Al2O3.4SiO2) = 436.48;

Kalsilita (K2O.Al2O3. 2SiO2) = 316.32;

Metasilicato Sódico (Na2O.SiO2) = 122.06;

 

Minerales fémicos:

Acmita (Na2O. Fe2O3. 4 SiO2) = 461.99;

Enstatita (MgO.SiO2) = 100.38;

Ferrosilita (FeO.SiO2) = 131.93;

Wollanstonita (CaO.SiO2) = 116.16;

Forsterita (2MgO.SiO2) = 140.68;

Fayalita (2FeO.SiO2) = 203.78;

Larnita (2CaO.SiO2) = 172.24;

Diópsido (CaO MgO 2 SiO2)

 

Accesorios:

Ilmenita (FeO.TiO2) = 151.75;

Titanita (TiO2.CaO.SiO2) = 196.06;

Rutilo (TiO2) = 79.9;

Perowskita (TiO2.CaO) = 135.98;

Magnetita (FeO.Fe2O3) = 231.54;

Hematites (Fe2O3) = 159.69;

Apatito (3CaO.P2O5) = 336.1;

 

 

Procedimiento:

 

1.- Cálculo de los milimoles: Dividir cada óxido por su peso molecular, multiplicar por 1000 y redondear. Sumar los milimoles de MnO al FeO.

 

Basalto                                              

 

Oxides                                                                                                           Milimoles         

                                                                                                                                            

SiO2     40.6                             (40.6/60.08)*1000 = 676                                   SiO2         676

TiO2    2.66                             (2.66/79.9)*1000 = 33                                      TiO2            33

Al2O3  14.33                           (14.33/101.96)*1000 = 141                               Al2O3        141

Fe2O3  5.48                             (5.48/159.69)*1000 = 34                                   Fe2O3         34

FeO     6.17                             (6.17/71.85)*1000 = 90                                     FeO            90

MgO    6.39                             (6.39/40.3)*1000 = 159                                     MgO         159

MnO    0.26                             (0.26/70.94)*1000 = 4                                      MnO             4

CaO     11.89                           (11.89/56.08)*1000 = 212                                 CaO           212

Na2O   4.79                             (4.79/61.98)*1000 = 77                                     Na2O          77

K2O     3.46                             (3.46/94.2)*1000 = 37                                      K2O            37

P2O5   1.07                             (1.07/141.94)*1000 = 8                                     P2O5             8

Tot       97.1

                       

Todos los pasos siguientes se harán a partir de los milimoles.

 

Siguentes pasos: Calculo de la mineralogía saturada