Microscopic weathering mechanisms of subflorescence and crust patterns in the Nankan Grotto, northern Sichuan, China

Heritage Science

Table 2 Major element compositions (%) of the samples from the different sites

Deterioration pattern	Sample	SiO₂	Al₂O₃	CaO	TFe₂O₃	K₂O	Na₂O	MgO	MnO	P₂O₅	SO₃	TiO₂	LOI
Subflorescence	S1	81.30	8.18	0.70	3.01	1.86	1.48	0.81	0.04	0.07	0.01	0.41	1.71
Subflorescence	S2	80.53	7.95	2.27	1.72	1.69	1.62	0.92	0.04	0.05	0.03	0.43	2.82
Crust	C1	74.72	7.63	5.73	1.21	1.70	1.59	0.93	0.04	0.04	1.88	0.23	5.96
Crust	C2	76.47	7.52	5.34	1.06	1.71	1.48	0.75	0.04	0.05	0.01	0.20	5.24