Table 4 Principal component matrix of the extracted factors controlling major oxides

− 0.860

− 0.209

0.302

0.251

0.132

0.853

0.158

− 0.288

− 0.284

− 0.058

0.750

0.324

− 0.292

− 0.081

− 0.298

0.101

− 0.279

0.271

− 0.544

0.680

0.202

0.811

0.073

0.089

0.058

− 0.917

− 0.210

− 0.248

0.059

− 0.026

0.946

− 0.173

− 0.083

0.198

0.033

0.933

− 0.120

0.106

0.267

0.125

− 0.323

0.405

0.599

− 0.248

0.070

0.920

− 0.125

0.165

− 0.130

0.012

0.873

− 0.176

0.077

0.213

0.206

0.216

− 0.401

0.370

0.636

0.138

0.698

0.108

0.582

− 0.102

− 0.073

− 0.204

0.760

− 0.249

0.203

0.368

− 0.003

0.903

0.018

0.240

0.211

− 0.156

0.265

0.817

− 0.018

− 0.404

43.76

17.76

12.6

7.5

6.3