Spatial and temporal variations of Rb/Sr ratios of the bulk surface sediments in Lake Qinghai

Table 2 Correlation coefficients between major elements of surface sediments in Lake Qinghai

	Al₂O₃ (%)	Fe₂O₃ (%)	K₂O (%)	Ti (ppm)	Rb (ppm)	MgO (%)	Na₂O (%)	Sr (ppm)	CaO (%)	Rb/Sr
SiO₂	0.655	0.841	0.553	0.983	-0.198	0.891	-0.702	-0.984	-0.995	0.953
Al₂O₃		0.944	0.989	0.732	0.124	0.319	-0.460	-0.760	-0.651	0.838
Fe₂O₃			0.897	0.901	0.054	0.589	-0.560	-0.910	-0.841	0.941
K₂O				0.635	0.226	0.202	-0.421	-0.669	-0.555	0.765
Ti					-0.194	0.866	-0.651	-0.993	-0.975	0.962
Rb						-0.253	0.020	0.181	0.113	-0.106
MgO							-0.580	-0.836	-0.890	0.732
Na₂O								0.660	0.700	-0.724
Sr									0.977	-0.980
CaO										-0.947

Bold and italic fonts show positive and negative correlations respectively. The underlined correlation coefficients are higher than 0.6.

ISSN: 1467-4866