Research on the Pore Evolution of Sandstone in Cold Regions under Freeze-Thaw Weathering Cycles Based on NMR

Table 1

Mineral constituent elements of the red sandstone.

Mineral elements	O	Si	C	Al	Na	Mg	K	Ca	Others
Content/%	65.74	12.14	9.55	4.01	3.20	2.81	0.33	0.54	1.68